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Nogueira Barbosa Marchon R, Mourão CF, Rutkowski JL, Ghanaati S, Mello-Machado RC, Mendes Senna P. Comparative Analysis of Internal Tapered Implant-Abutment Connections: Evaluating the Morse Effect. J ORAL IMPLANTOL 2024; 50:431-434. [PMID: 38826061 DOI: 10.1563/aaid-joi-d-24-00039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2024]
Abstract
The purpose of the present study was to evaluate the Morse effect of different internal tapered implant-abutment connections (ITCs) using a pullout test. Implants with different ITCs were selected: Short (Bicon, USA), G1; Novo Colosso (Medens, Brazil), G2; Epkut (SIN, Brazil), G3; Strong SW (SIN, Brazil), G4; Flash (Conexão, Brazil), G5 and Bone Level (Straumann, Switzerland), G6. The respective computer-aided design (CAD) files were loaded into the analysis software to measure each ITC's taper angle and implant-abutment contact area. Six implants from each group were embedded in acrylic resin blocks, and the respective universal abutments were fixed using a mallet (G1) or by applying 20 Ncm of torque (G2 to G6). After 10 minutes, each abutment's retention screw was removed, and the force necessary for abutment rupture was recorded using a universal testing machine at a crosshead speed of 0.5 mm/min. The groups were compared using a one-way analysis of variance and Tukey's test. Spearman's correlation was used to check the correlation of the taper angle and contacting area with the pullout strength. G1, a no-screw abutment with a 3° taper, and G2, a 10° tapered abutment tightened by 20 Ncm, presented the highest pullout strength (P < .05). The increased taper angle of G4, compared to G3, reduced the Morse effect despite their similar implant-abutment contacting areas (P < .05). The G5 and G6 abutments loosened after screw removal and did not exhibit pullout resistance. The closer the tapered angle (r = -.958) and the higher the implant-abutment contact area (r = .880), the higher the pullout strength (P < .001). Within the limits of this study, the Morse effect is different among tapered implant-abutment connections. The closer the tapered angle and the higher the interface area, the higher the Morse effect between the abutment and the implant.
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Affiliation(s)
| | - Carlos Fernando Mourão
- Department of Periodontology, Tufts University School of Dental Medicine, Boston, Massachusetts
| | - James L Rutkowski
- Department of Restorative Dentistry, School of Dental Medicine, State University of New York, Buffalo
| | - Shahram Ghanaati
- Department for Oral, Cranio-Maxillofacial and Facial Plastic Surgery, FORM (Frankfurt Orofacial Regenerative Medicine) Lab, University Hospital Frankfurt, Goethe University, Germany
| | | | - Plinio Mendes Senna
- Department of Prosthodontics, Rio de Janeiro State University, Rio de Janeiro, Brazil
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Moreno ALDM, Campaner M, de Moraes Melo Neto CL, Moreno NVDA, Dos Santos DM, Goiato MC. Evaluation of Microstrain in the Regions Surrounding Morse Taper and External Hexagon Implants. Eur J Dent 2024. [PMID: 39013445 DOI: 10.1055/s-0044-1787696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/18/2024] Open
Abstract
OBJECTIVE The aim of this study was to compare the Morse taper (MT) + titanium base (Ti-Base) abutment with the external hexagon (EH) + Ti-Base abutment by using the strain gauge method in the mesial, distal, and apical-buccal areas around these types of implants. MATERIALS AND METHODS This study investigated two groups, MT and EH, each comprising five polyurethane samples with a dental implant in the area of artificial tooth 15 (3.75 × 11.5 mm) of a dental manikin. The strain gauges were glued to the mesial, distal, and apical-buccal polyurethane areas of all samples in relation to the implant. Ti-Base nonangled abutments measuring 5.0 × 4.7 × 1.0 mm (DSP, Brazil) were installed on the implants in each group. Ten identical zirconia crowns were constructed by scanning and milling and were subsequently cemented onto the Ti-base abutments with calcium hydroxide cement. Then, an axial load of 100 N was applied to the occlusal region of the zirconia crowns, and strain gauge measurements were taken. STATISTICAL ANALYSIS Strain gauge data were assessed by a two-way analysis of variance (ANOVA) with "implant connection" and "strain gauge position" factors, followed by the Bonferroni test (p < 0.05). RESULTS The MT group exhibited a statistically significant reduction in microstrain in the mesial and apical strain gauge measurements compared to the EH group. CONCLUSION The MT group exhibited less microstrain in the mesial and apical areas of the polyurethane samples near the implant. Consequently, the MT connection was considered more biomechanically advantageous.
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Affiliation(s)
- André Luiz de Melo Moreno
- Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), School of Dentistry, Araçatuba, São Paulo, Brazil
| | - Marcio Campaner
- Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), School of Dentistry, Araçatuba, São Paulo, Brazil
| | | | | | - Daniela Micheline Dos Santos
- Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), School of Dentistry, Araçatuba, São Paulo, Brazil
| | - Marcelo Coelho Goiato
- Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), School of Dentistry, Araçatuba, São Paulo, Brazil
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Roghanizadeh L, Akbarzadeh Baghban A, Azizzadeh J, Asgary S. A Bibliometric Study on the Top 101 Most-Cited Articles of Dental Journals of the Middle East/North Africa Countries From 2011 to 2021. J Lasers Med Sci 2023; 14:e15. [PMID: 37583497 PMCID: PMC10423963 DOI: 10.34172/jlms.2023.15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Accepted: 03/16/2023] [Indexed: 08/17/2023]
Abstract
Introduction: This retrospective descriptive study evaluated the Scopus-indexed dental journals and their most-cited documents affiliated with the Middle East and North Africa (MENA) countries from 2011 to 2021. Methods: Dental journals affiliated with MENA countries, their bibliometric indicators (SJR, CiteScore, SNIP, and H-index), and the 101 most cited articles of the considered journals were extracted and studied through descriptive statistics. In addition, the "citation per year" of each top 101 articles was calculated. Spearman's rho test was used for pairwise comparisons of the correlation coefficient values between each two of the considered bibliometric indicators. Results: The number of citations of the 101 most-cited papers ranged from 35 to 203. The mean (SD) citations of studied articles were 61.33 (37.58) and the median was 46. Furthermore, CiteScore had the highest significant correlation with SJR (r=0.828, P˂0.001). Moreover, the citation per year of the top 101 documents had no significant relationship with any of the journals' bibliometric indicators. Conclusion: Because journal performance and citation rate are multi-dimensional concepts, a single metric cannot express them thoroughly despite correlations between indices. "European Journal of Dentistry" from Turkey, "Saudi Dental Journal" from Saudi Arabia, and "Iranian Endodontic Journal" and "Journal of Lasers in Medical Sciences" both from Iran had the highest ranks in the SCImago portal and the highest scores in bibliometric indices amongst the MENA dental journals.
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Affiliation(s)
- Leyla Roghanizadeh
- Dental Research Center, Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Alireza Akbarzadeh Baghban
- Proteomics Research Center, Department of Biostatistics, School of Allied Medical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Jila Azizzadeh
- Iranian Center for Endodontic Research, Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Saeed Asgary
- Iranian Center for Endodontic Research, Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Khamis MM, Zakaria NH, Farrag KM, Abolgheit S. Evaluation of the dislodgement force of splinted restorations with engaging conical abutments over multiple nonparallel implants (in-vitro study). BMC Oral Health 2023; 23:300. [PMID: 37198623 DOI: 10.1186/s12903-023-02958-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Accepted: 04/10/2023] [Indexed: 05/19/2023] Open
Abstract
BACKGROUND Splinted multiunit cement-retained restorations with screw access channels over engaging abutments are viable implant prosthetic options. However, information regarding the maximum degree of divergence between multiple implants is lacking. The purpose of this in vitro study was to determine the maximum degree of divergence between 2 adjacent implants with conical connections that allows insertion and removal of splinted restorations with engaging preparable abutments or titanium base abutments. METHODS Two implants were aligned in a stone base, one straight and the other at an angle ranging from 0 to 20 degrees. The implants represented an implant system that had an internal conical connection and a hexed abutment engaging the base of the connection. Two straight preparable engaging cement retained abutments were screwed onto the implants and splinted together using acrylic resin. A total of 11 angles were tested, with 7 specimens for every angle. Evaluation of dislodging force was performed by pulling out the splinted abutments after unscrewing them. This was performed subjectively by 3 blinded investigators who applied a tactile pulling force. A scale of 0-10 was used to estimate the pulling force. Objectively the dislodging force was measured in Newtons using a universal testing machine. A statistical correlation was made between the subjective and objective dislodging force values using Spearman's rank correlation coefficient. RESULTS The mean subjective values increased gradually from 0 to 16 degrees. A sudden rise was noticed at 18 degrees (9.71 ± 0.23) and, at 20 degrees, the investigators were not able to remove the splinted abutments from the implants. The mean objective dislodgement force values increased gradually from 0 to16 degrees and abruptly from 16 degrees (13.57 ± 0.45 N) to 18 degrees (25.40 ± 0.66 N) and 20 degrees (35.22 ± 0.64). The correlation between the subjective and the objective evaluations assessed using the Spearman's rank correlation coefficient was 0.98 indicating a statistically significant correlation (P < .001). As the objective dislodging force increased, the subjective dislodgement difficulty increased. CONCLUSIONS Splinting cement retained restorations with screw access channels on engaging abutments is possible when multiple implants with conical connections having an internal flare angle of 8 degrees are used, with implant divergence of up to 16 degrees.
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Affiliation(s)
- Mohamed Moataz Khamis
- Department of Prosthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
| | - Niveen Hazem Zakaria
- Division of Fixed Prosthodontics, Conservative Dentistry Department, Faculty of Dentistry, Alexandria University, Alexandria, Egypt.
| | - Khaled Mohamed Farrag
- Division of Fixed Prosthodontics, Conservative Dentistry Department, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
| | - Salma Abolgheit
- Department of Dental Biomaterials, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
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Gehrke SA, Scarano A, Cortellari GC, Fernandes GVO, Mesquita AMM, Bianchini MA. Marginal Bone Level and Biomechanical Behavior of Titanium-Indexed Abutment Base of Conical Connection Used for Single Ceramic Crowns on Morse-Taper Implant: A Clinical Retrospective Study. J Funct Biomater 2023; 14:jfb14030128. [PMID: 36976052 PMCID: PMC10057670 DOI: 10.3390/jfb14030128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 02/20/2023] [Accepted: 02/23/2023] [Indexed: 03/03/2023] Open
Abstract
The goal of this retrospective clinical study was to evaluate the behavior of Morse-taper indexed abutments by analyzing the marginal bone level (MBL) after at least 12 months of function. Patients rehabilitated with single ceramic crowns between May 2015 and December 2020 received single Morse-taper connection implants (DuoCone implant) with two-piece straight abutment baseT used for at least 12 months, presenting periapical radiograph immediately after crown installation were enrolled. The position of the rehabilitated tooth and arch (maxilla or mandible), crown installation period, implant dimensions, abutment transmucosal height, installation site (immediate implant placement or healed area), associated with bone regeneration, immediate provisionalization, and complications after installation of the final crown were analyzed. The initial and final MBL was evaluated by comparing the initial and final X-rays. The level of significance was α = 0.05. Seventy-five patients (49 women and 26 men) enrolled had a mean period of evaluation of 22.7 ± 6.2 months. Thirty-one implant-abutment (IA) sets had between 12–18 months, 34 between 19–24 months, and 44 between 25–33 months. Only one patient failed due to an abutment fracture after 25 months of function. Fifty-eight implants were placed in the maxilla (53.2%) and 51 in the mandible (46.8%). Seventy-four implants were installed in healed sites (67.9%), and 35 were in fresh socket sites (32.1%). Thirty-two out of these 35 implants placed in fresh sockets had the gap filled with bone graft particles. Twenty-six implants received immediate provisionalization. The average MBL was −0.67 ± 0.65 mm in mesial and −0.70 ± 0.63 mm in distal (p = 0.5072). The most important finding was the statistically significant difference comparing the values obtained for MBL between the abutments with different transmucosal height portions, which were better for abutments with heights greater than 2.5 mm. Regarding the abutments’ diameter, 58 had 3.5 mm (53.2%) and 51 had 4.5 mm (46.8%). There was no statistical difference between them, with the following means and standard deviation, respectively, −0.57 ± 0.53 mm (mesial) and −0.66 ± 0.50 mm (distal), and −0.78 ± 0.75 mm (mesial) and −0.746 ± 0.76 mm (distal). Regarding the implant dimensions, 24 implants were 3.5 mm (22%), and 85 implants (78%) had 4.0 mm. In length, 51 implants had 9 mm (46.8%), 25 had 11 mm (22.9%), and 33 implants were 13 mm (30.3%). There was no statistical difference between the abutment diameters (p > 0.05). Within the limitations of this study, it was possible to conclude that better behavior and lesser marginal bone loss were observed when using abutment heights greater than 2.5 mm of transmucosal portion and when placed implants with 13 mm length. Furthermore, this type of abutment showed a little incidence of failures within the period analyzed in our study.
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Affiliation(s)
- Sergio Alexandre Gehrke
- Department of Research, Bioface/PgO/UCAM, Calle Cuareim 1483, Montevideo 11100, Uruguay
- Instituto de Bioingenieria, Universidad Miguel Hernández, Avda. Ferrocarril s/n., 03202 Elche, Spain
- Department of Biotechnology, Universidad Católica de Murcia (UCAM), 30107 Murcia, Spain
- Department of Materials Engineering, Pontificia Universidade Católica do Rio Grande do Sul, Porto Alegre 90619-900, Brazil
- Correspondence: (S.A.G.); (G.V.O.F.); Tel./Fax: +598-29015634 (S.A.G.)
| | - Antonio Scarano
- Department of Research, Bioface/PgO/UCAM, Calle Cuareim 1483, Montevideo 11100, Uruguay
- Department of Innovative Technologies in Medicine & Dentistry, University of Chieti-Pescara, 66100 Chieti, Italy
| | | | - Gustavo Vicentis Oliveira Fernandes
- Periodontics and Oral Medicine Department, University of Michigan School of Dentistry, Ann Arbor, MI 48109, USA
- Correspondence: (S.A.G.); (G.V.O.F.); Tel./Fax: +598-29015634 (S.A.G.)
| | | | - Marco Aurélio Bianchini
- Post-Graduate Program in Implant Dentistry (PPGO), Federal University of Santa Catarina (UFSC), Florianópolis 88040-900, Brazil
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Mendez A, Coronado H. [Stress in an implant-supported unitary fixed partial prosthesis with different materials in the first lower premolar through finite elements]. REVISTA CIENTÍFICA ODONTOLÓGICA 2023; 11:e140. [PMID: 38288318 PMCID: PMC10810070 DOI: 10.21142/2523-2754-1101-2023-140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Accepted: 03/09/2023] [Indexed: 01/31/2024] Open
Abstract
AIM To analyze stress in a metal-ceramic, zirconia and lithium disilicate implant-supported unitary fixed partial prosthesis in the first lower premolar through finite element analysis at a 500 N force. MATERIALS AND METHODS Three study models were carried out, metal-ceramic, lithium disilicate and zirconium implant-supported crowns in the first lower premolar. The dental implant was made of titanium grade 5 based on the Bolt® model of UniDentalDirect with internal grooved connection (18 grooves) and the implant had a size of 11,0 x 4,5 mm, preformed abutment and integrated screw. The three designs had vertical and oblique (45°) forces applications at 500 N. The geometric modeling was performed with the SolidWorks® 2017 program and the results were obtained through the Von mises analysis using the CosmoWorks®2017 program. RESULTS The lowest value of maximum stress on crown level, under vertical and oblique forces, was found in the lithium disilicate crown with 21,9 MPa and 33,2 MPa, and with a minimum difference with the zirconium crown with 22,1 MPa and 35,1 MPa; on the abutment level, the zirconium crown had the lowest value of maximum stress with 18,6 MPa and 28,1 MPa; at the screw level, there were no significant differences. CONCLUSION Metal-ceramic, lithium disilicate, and zirconia crowns proved to be materials of good compressive and tensile strength, but it was concluded that the zirconia crown design generated lower overall stress.
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Affiliation(s)
- A Mendez
- Carrera de Estomatología, Universidad Científica del Sur. Lima, Perú. , Universidad Científica del Sur Carrera de Estomatología Universidad Científica del Sur Lima Peru
| | - H Coronado
- Carrera de Estomatología, Universidad Científica del Sur. Lima, Perú. , Universidad Científica del Sur Carrera de Estomatología Universidad Científica del Sur Lima Peru
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Hariharan AS, Sivaswamy V, Subhashini R. Implant-Abutment Connections: A Structured Review. J Long Term Eff Med Implants 2022; 33:47-56. [PMID: 36382704 DOI: 10.1615/jlongtermeffmedimplants.2022042610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The aim of the study was to carry out a structured review of studies that dealt with types of implant abutment connections, the concept of platform switching and its influence on hard and soft oral tissues. Electronic search was conducted over PubMed, Google Scholar, Medline, Embase to find articles dealing with Implant abutment connection and platform switching. We came across a total of 248 articles, which were filtered to a cumulative 19 articles after cross matching with predetermined inclusion and exclusion criteria. Most of the available literature gravitates in favor of an internal connection with the incorporation of platform switching to attain satisfactory hard and soft tissue outcomes.
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Affiliation(s)
| | - Vinay Sivaswamy
- Department of Prosthodontics, Saveetha Dental College, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai 600077, India
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Shah KK, Sivaswamy V. Assessment of Knowledge on Implant Abutment and Platform Switching among Dental Specialists Practicing Implantology. J Long Term Eff Med Implants 2022; 33:31-37. [PMID: 36382702 DOI: 10.1615/jlongtermeffmedimplants.2022042721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Implant abutment connection has proven to have a significant impact on the success of the prosthetic rehabilitation for an implant-supported restoration. This connection not only provides the base on which the restoration is supported but also maintains the integrity of the hard and the soft tissues surrounding the implant. A wide range of implants and their implant abutments are now widely available in the market. Such a wide range would undoubtedly put the clinician in a quandary when it comes to selecting an acceptable abutment, one that is scientifically based and also has a high clinical rate of success. As a result, this study is a straightforward attempt to assess the knowledge of the dental specialists practicing implantology on the areas of implant abutment connections as well as platform switching. The aim of this study was to assess the knowledge on various implant abutment and platform switching among various dental specialists practicing implantology. An online multiple-choice questionnaire based survey was circulated amongst a total of 100 dental specialists with questions assessing their knowledge about implant-abutment connections, platform switching and its significance. Although the degree of information about implant-abutment connection and platform switching appears to be appropriate among various dental specialists practicing implantology, there is a dearth of understanding regarding the mechanical, biological and technical considerations. With the advent of various implant manufacturer and their production of implants as well as their components, the clinicians are undoubtedly put in a quandary when it comes to selecting an acceptable abutment, one that is scientifically based and also has a high clinical rate of success. Therefore, more light must be thrown not only on the surgical aspects of implant dentistry, but also on the prosthetic rehabilitation and its components, in order to ensure clinical success in terms of restoring a patient's function as well as aesthetic.
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Affiliation(s)
- Khushali K Shah
- Department of Prosthodontics, Saveetha Dental College, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, India
| | - Vinay Sivaswamy
- Department of Prosthodontics, Saveetha Dental College, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai 600077, India
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Zhang WT, Cheng KJ, Liu YF, Wang R, Chen YF, Ding YD, Yang F, Wang LH. Effect of the prosthetic index on stress distribution in Morse taper connection implant system and peri-implant bone: a 3D finite element analysis. BMC Oral Health 2022; 22:431. [PMID: 36180871 PMCID: PMC9523891 DOI: 10.1186/s12903-022-02465-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Accepted: 09/19/2022] [Indexed: 11/23/2022] Open
Abstract
Background The combination of a prosthetic index with Morse taper connection was developed, with the purpose of making prosthetic procedures more precise. However, the presence of the index may compromise the mechanical performance of the abutment. The aim of this study is to evaluate the effect of prosthetic index on stress distribution in implant–abutment-screw system and peri-implant bone by using the 3D finite element methodology. Methods Two commercial dental implant systems with different implant–abutment connections were used: the Morse taper connection with platform switching (MT-PS) implant system and the internal hex connection with platform matching (IH-PM) implant system. Meanwhile, there are two different designs of Morse taper connection abutment, namely, abutments with or without index. Consequently, three different models were developed and evaluated: (1) MT-PS indexed, (2) MT-PS non-indexed, and (3) IH-PM. These models were inserted into a bone block. Vertical and oblique forces of 100 N were applied to each abutment to simulate occlusal loadings. Results For the MT-PS implant system, the maximum stress was always concentrated in the abutment neck under both vertical and oblique loading. Moreover, the maximum von Mises stress in the neck of the MT-PS abutment with index even exceed the yield strength of titanium alloy under the oblique loading. For the IH-PM implant system, however, the maximum stress was always located at the implant. Additionally, the MT-PS implant system has a significantly higher stress level in the abutment neck and a lower stress level around the peri-implant bone compared to the IH-PM implant system. The combined average maximum stress from vertical and oblique loads is 2.04 times higher in the MT-PS indexed model, and 1.82 times for the MT-PS non-indexed model than that of the IH-PM model. Conclusions MT-PS with index will cause higher stress concentration on the abutment neck than that of without index, which is more prone to mechanical complications. Nevertheless, MT-PS decreases stress within cancellous bone and may contribute to limiting crestal bone resorption.
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Affiliation(s)
- Wen-Tao Zhang
- Center for Plastic and Reconstructive Surgery, Department of Stomatology, Zhejiang Provincial People's Hospital (Affiliated People's Hospital, Hangzhou Medical College), No. 158 Shangtang Rd., Hangzhou, 310014, China
| | - Kang-Jie Cheng
- College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, 310023, China.,Key Laboratory of Special Purpose Equipment and Advanced Processing Technology, Ministry of Education and Zhejiang Province, Zhejiang University of Technology, Hangzhou, 310023, China.,National International Joint Research Center of Special Purpose Equipment and Advanced Processing Technology, Zhejiang University of Technology, Hangzhou, 310023, China
| | - Yun-Feng Liu
- College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, 310023, China.,Key Laboratory of Special Purpose Equipment and Advanced Processing Technology, Ministry of Education and Zhejiang Province, Zhejiang University of Technology, Hangzhou, 310023, China.,National International Joint Research Center of Special Purpose Equipment and Advanced Processing Technology, Zhejiang University of Technology, Hangzhou, 310023, China
| | - Russell Wang
- Department of Comprehensive Care, Case Western Reserve University School of Dental Medicine, Cleveland, OH, 44106-4905, USA
| | - Yun-Fang Chen
- Center for Plastic and Reconstructive Surgery, Department of Stomatology, Zhejiang Provincial People's Hospital (Affiliated People's Hospital, Hangzhou Medical College), No. 158 Shangtang Rd., Hangzhou, 310014, China
| | - Yu-de Ding
- Center for Plastic and Reconstructive Surgery, Department of Stomatology, Zhejiang Provincial People's Hospital (Affiliated People's Hospital, Hangzhou Medical College), No. 158 Shangtang Rd., Hangzhou, 310014, China
| | - Fan Yang
- Center for Plastic and Reconstructive Surgery, Department of Stomatology, Zhejiang Provincial People's Hospital (Affiliated People's Hospital, Hangzhou Medical College), No. 158 Shangtang Rd., Hangzhou, 310014, China.
| | - Lin-Hong Wang
- Center for Plastic and Reconstructive Surgery, Department of Stomatology, Zhejiang Provincial People's Hospital (Affiliated People's Hospital, Hangzhou Medical College), No. 158 Shangtang Rd., Hangzhou, 310014, China.
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Collins JR, Ogando BP, Hong H, Hou W, Romanos GE. Clinical and Radiographic Evaluation of a Novel Triangular Implant Neck Design: A Case Series. Dent J (Basel) 2022; 10:dj10060113. [PMID: 35735655 PMCID: PMC9221962 DOI: 10.3390/dj10060113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 06/06/2022] [Accepted: 06/15/2022] [Indexed: 02/04/2023] Open
Abstract
The objective of this study was to evaluate the clinical and radiographic behavior of a novel triangular neck implant configuration in partially edentulous patients. Sixteen patients with a mean age of 58.3 years, were rehabilitated with 25 implants inserted in the healed sites of the maxilla and mandible; implant diameter was Ø3.3 and 3.9 mm. Clinical and radiographic measurements were first performed at prosthesis delivery that served as baseline; they were further evaluated after a mean period of 15.6 months. The interproximal peri-implant bone levels were the primary outcome; the mesial and distal data were recorded and a mean value was calculated. Secondary outcomes included peri-implant probing depth (PPD) and bleeding on probing (BoP). The paired t-test was used to compare the radiographic and clinical outcomes between baseline and follow-up. The mean bone levels at the mesial and distal aspects at baseline were 0.45 (0.47) and 0.57 (0.69), respectively; at follow-up they were 0.59 (0.42) and 0.78 (0.59), respectively. The differences were not statistically significant. Similarly, no significant differences were found for the clinical parameters. Within the limitations of the present study, it could be concluded that this new triangular neck bone level implant macro-design was used successfully to treat partially edentulous patients. Larger controlled clinical studies are warranted to confirm the present radiographic and clinical findings.
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Affiliation(s)
- James Rudolph Collins
- Department of Periodontology, School of Dentistry, Pontificia Universidad Católica Madre y Maestra (PUCMM), Santo Domingo 10109, Dominican Republic; (J.R.C.); (B.P.O.)
| | - Brendha P. Ogando
- Department of Periodontology, School of Dentistry, Pontificia Universidad Católica Madre y Maestra (PUCMM), Santo Domingo 10109, Dominican Republic; (J.R.C.); (B.P.O.)
| | - Houlin Hong
- School of Public Health & Health Policy, City University of New York, New York, NY 10031, USA;
| | - Wei Hou
- Department of Family, Population and Preventive Medicine, School of Medicine, Stony Brook University, New York, NY 11794, USA;
| | - Georgios E. Romanos
- Department of Periodontology, School of Dental Medicine, Stony Brook University, New York, NY 11794, USA
- Correspondence:
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Ellendula Y, Chandra Sekar A, Nalla S, Basany RB, Sailasri K, Thandu A. Biomechanical Evaluation of Stress Distribution in Equicrestal and Sub-crestally Placed, Platform-Switched Morse Taper Dental Implants in D3 Bone: Finite Element Analysis. Cureus 2022; 14:e24591. [PMID: 35664406 PMCID: PMC9148546 DOI: 10.7759/cureus.24591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/29/2022] [Indexed: 11/05/2022] Open
Abstract
Aim The aim of the study was to assess the effect of implant placement depth on stress distribution in bone around a platform-switched and Morse taper dental implants placed at the equi-crestal and 1 mm and 2 mm sub-crestal levels in a D3 bone using the 3D finite element analysis. Methodology A mechanical model of a partially edentulous maxilla was generated from a computerized tomography (CT) scan of an edentulous patient, as it can give exact bony contours of cortical bone. Also, from accurate geometric measurements obtained from the manufacturer, 3D models of Morse taper and platform-switched implants were manually drawn. The implant and bone models were then superimposed to simulate implant insertion in bone. Three implant positioning levels such as the equi-crestal, 1 mm sub-crestal, and 2 mm sub-crestal models were created, and meshing was done to create the number of elements for distribution of applying loads. The elastic properties of cortical bone and implant, such as Young's modulus and Poisson's ratio (µ), were determined. A load (axial and oblique) of 200N that simulated masticatory force was applied. Results On comparing stresses within the bone around the equi-crestal and 1 mm and 2 mm sub-crestal implants, it was observed that the maximum stresses were seen within cortical bone around the equi-crestally placed implant (21.694), the least in the 2 mm sub-crestally placed implant (18.85), and intermediate stresses were seen within the 1 mm sub-crestally placed implant (18.876). Conclusion Sub-crestal (1-2mm) placement of a Morse taper and a platform-switched implant is recommended for long-term success, as maximum von Mises stresses were found within cortical bone around the equi-crestal implant followed by the 1 mm sub-crestal implant and then the 2 mm sub-crestal implant.
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Affiliation(s)
- Yashaswini Ellendula
- Department of Prosthodontics and Crown & Bridge, SVS Institute of Dental Sciences, Mahabubnagar, IND
| | - Anam Chandra Sekar
- Department of Prosthodontics and Crown & Bridge, SVS Institute of Dental Sciences, Mahabubnagar, IND
| | - Sandeep Nalla
- Department of Prosthodontics and Crown & Bridge, SVS Institute Of Dental Sciences, Mahabubnagar, IND
| | - Ram B Basany
- Department of Prosthodontics and Crown & Bridge, SVS Institute of Dental Sciences, Mahabubnagar, IND
| | - Kunchala Sailasri
- Department of Prosthodontics and Crown & Bridge, SVS Institute of Dental Sciences, Mahabubnagar, IND
| | - Ashwini Thandu
- Department of Prosthodontics and Crown & Bridge, SVS Institute Of Dental Sciences, Mahabubnagar, IND
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12
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Periodontal Pathogen Adhesion, Cytotoxicity, and Surface Free Energy of Different Materials for an Implant Prosthesis Screw Access Hole. Medicina (B Aires) 2022; 58:medicina58020329. [PMID: 35208651 PMCID: PMC8879256 DOI: 10.3390/medicina58020329] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 02/09/2022] [Accepted: 02/10/2022] [Indexed: 11/17/2022] Open
Abstract
Background and Objectives: Oral implant restorations are an excellent treatment option for edentulous patients; however, periodontopathogenic bacteria have been found in the microgaps between implant−abutment junctions. Implant designs to limit the microgaps have been extensively studied. However, studies have shown microgaps continue to exist, allowing for the leakage of bacteria into the implant system. Screw access hole materials are used to fill the access hole void. The use of materials with beneficial properties could provide bacterial leakage prevention. The aim of this study was to examine the surface free energy, cytotoxicity, and bacterial adhesion of selected screw access hole materials such as cotton, polytetrafluoroethylene (PTFE) tape, paraffin wax−polyolefin thermoplastic (PF), paraffin wax (Wax), gutta-percha (GP), and caviton EX (CE). Materials and Methods: A sessile drop test was performed to observe the contact angle and calculate the surface free energy of each material in order to determine the level of hydrophobicity. Cytotoxicity was examined in a mouse gingival epithelial cell line for day 1 and day 3. Bacterial adhesion was tested with Porphyromonas gingivalis, Fusobacterium nucleatum, and Aggregatibacter actinomycetemcomitans. Results: PTFE, PF, and wax presented low surface free energies of 19.34, 23.041, and 24.883 mN.m-1, respectively. No cytotoxicity was observed, except for GP and CE. Concurrently, the bacterial adhesion was also the lowest in PTFE and PF. Conclusion: Within the limits of this study, PTFE and PF showed an excellent biocompatibility with few bacterial adhesions. These materials could be potential screw access hole materials in clinical settings.
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13
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Baer RA, Nölken R, Colic S, Heydecke G, Mirzakhanian C, Behneke A, Behneke N, Gottesman E, Ottria L, Pozzi A, Fügl A, Zechner W. Immediately provisionalized tapered conical connection implants for single-tooth restorations in the maxillary esthetic zone: a 5-year prospective single-cohort multicenter analysis. Clin Oral Investig 2022; 26:3593-3604. [PMID: 34997359 PMCID: PMC8979890 DOI: 10.1007/s00784-021-04328-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Accepted: 11/29/2021] [Indexed: 11/04/2022]
Abstract
Objectives This open, single-cohort, multicenter, prospective study investigated the efficacy of immediately provisionalized tapered conical connection implant for single-tooth restorations in the anterior and premolar regions of the maxilla after 5 years of function. Materials and methods All implants were placed in healed sites and immediately provisionalized. MBLs, soft-tissue parameters, and oral-health impact profile (OHIP) were evaluated at implant insertion, 6, 12, 24, 36, and 60 months. Paired Wilcoxon signed-rank tests and Kaplan–Meier survival analysis was used for statistical and implant survival/success analyses, respectively. Results Seventy-seven patients (81 implants) completed the 5-year follow-up. The 5-year cumulative survival and success rates were 97.8%, and the mean MBL change from implant insertion to 5 years was − 0.80 ± 1.13 mm. Optimal papilla index scores were observed at 90.1% of sites at 5 years compared with 32.8% of sites at insertion. Pink esthetic score, modified bleeding and plaque indices, and OHIP showed statistically significant improvement at the 5-year follow-up. Conclusions Immediately provisionalized tapered conical connection implants promote marginal bone stability and excellent esthetic outcomes after 5 years of function. Clinical relevance This treatment is a viable option for patients requiring immediately provisionalized single-tooth restorations in the esthetic zone and shows favorable long-term clinical outcomes, including marginal bone stability and excellent esthetics.
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Affiliation(s)
| | - Robert Nölken
- University Medical Center of Johannes Gutenberg University Mainz, Mainz, Germany.,Private Practice, Lindau, Germany
| | | | - Guido Heydecke
- University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | | | - Alexandra Behneke
- University Medical Center of Johannes Gutenberg University Mainz, Mainz, Germany
| | - Nikolaus Behneke
- University Medical Center of Johannes Gutenberg University Mainz, Mainz, Germany
| | | | | | | | - Alexander Fügl
- Dental University Clinic, Medical University of Vienna, Vienna, Austria
| | - Werner Zechner
- Dental University Clinic, Medical University of Vienna, Vienna, Austria
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14
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Ala LAB, Nogueira TE, Leles CR. One-year prospective study on single short (7-mm) implant overdentures in patients with severely resorbed mandibles. Clin Oral Implants Res 2021; 33:291-301. [PMID: 34951501 DOI: 10.1111/clr.13887] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 12/02/2021] [Accepted: 12/19/2021] [Indexed: 01/15/2023]
Abstract
OBJECTIVE This prospective study aimed to assess the effectiveness of using a single short implant to retain a single-implant mandibular overdenture (SIMO) in participants with severely atrophic edentulous mandibles. MATERIAL AND METHODS The study sample included 18 edentulous participants with severely resorbed mandibular ridges and limited bone height in the symphyseal region sufficient for the insertion of a 7.0-mm-height implant. First, patients received new conventional dentures or had their dentures relined, followed by the insertion of a 3.75 x 7 mm morse-taper implant, and the incorporation of a stud-type attachment and a nylon retentive insert after a 3-month healing period. Implant stability quotient (ISQ) was measured at baseline and after 3 and 12 months. Patient-reported outcomes (satisfaction with the dentures and oral health-related quality of life) were assessed before implant placement and at the 3-, 6-, and 12-month follow-ups. Clinical-radiographic outcomes and the incidence of prosthodontic events were assessed throughout the follow-up period. RESULTS The implant survival rate was 100%. ISQ increased from baseline (72.7 ± 6.6) to the 3-month (82.0 ± 3.3) and 1-year (85.4 ± 2.9) follow-ups (p < .001). After 1 year, satisfaction with the mandibular prosthesis increased significantly, and the overall OHIP-Edent score decreased by 79.2%. No effects were found for the maxillary denture (p = .420). Due to dissatisfaction with treatment, two participants (11.1%) required additional implants after the 1-year follow-up and were considered as prosthodontic failures. CONCLUSION Single-implant mandibular overdenture retained by a short implant showed favorable outcomes after 1 year. Further studies with larger samples and longer follow-up periods are needed to confirm the findings of this single-group prospective study. The present study was registered at the Brazilian Clinical Trials Registry (REBEC), identifier RBR-7p2xmg. The trial registry occurred during the study execution, and its final approval was delayed because of several formatting adequacies required by the platform REBEC.
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Affiliation(s)
| | - Túlio Eduardo Nogueira
- Department of Oral Rehabilitation, Faculty of Dentistry, Federal University of Goias, Goiânia, Brazil
| | - Cláudio Rodrigues Leles
- Department of Oral Rehabilitation, Faculty of Dentistry, Federal University of Goias, Goiânia, Brazil
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15
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Bittencourt ABBC, Neto CLDMM, Penitente PA, Pellizzer EP, Dos Santos DM, Goiato MC. Comparison of the Morse Cone Connection with the Internal Hexagon and External Hexagon Connections Based on Microleakage - Review. Prague Med Rep 2021; 122:181-190. [PMID: 34606430 DOI: 10.14712/23362936.2021.15] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Abstract
The gap formed at the abutment-implant interface brings about a bacterial colonization. In addition, a bacterial reservoir can be established within the implant. The build-up of microorganisms around the implant can cause soft tissue infections and bone loss around the implant, which can lead to implant failure. Our literature review aimed to evaluate the infiltration at the implant-abutment interface, comparing the Morse cone connection with the external hexagon and internal hexagon connections. A literature search using the PubMed database was performed on March 24, 2021. The search terms were combinations of "Morse cone" or "Morse taper" with each of the following terms (individually): "microleakage", "leakage", "infiltration", and "penetration". The inclusion criterion was in vitro studies comparing the Morse cone with the external hexagon and/or internal hexagon, based on infiltration at the implant-abutment interface. The exclusion criterion was the evaluation of microleakage at the implant-abutment interface after applying a sealant over this region. The search was expanded as needed. There was no limit on the year of publication, and only articles written in English were included. In addition, references cited in included articles were also included in this review when they were appropriate. This literature review concluded that, in most cases, the microleakage in the Morse cone connection was lower when compared with the external hexagon and internal hexagon connections.
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Affiliation(s)
| | | | - Paulo Augusto Penitente
- Department of Dental Materials and Prosthodontic, Araçatuba School of Dentistry, São Paulo State University (UNESP), São Paulo, Brazil
| | - Eduardo Piza Pellizzer
- Department of Dental Materials and Prosthodontic, Araçatuba School of Dentistry, São Paulo State University (UNESP), São Paulo, Brazil
| | - Daniela Micheline Dos Santos
- Department of Dental Materials and Prosthodontic, Araçatuba School of Dentistry, São Paulo State University (UNESP), São Paulo, Brazil
| | - Marcelo Coelho Goiato
- Department of Dental Materials and Prosthodontic, Araçatuba School of Dentistry, São Paulo State University (UNESP), São Paulo, Brazil.
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Abstract
Implant supported dental prostheses are increasingly used in dental practice. The aim of this narrative review is to present the influence of transmucosal surface of prosthetic abutment and implant on peri-implant tissue. The article describes causes of bone loss around the dental implant. Moreover, properties of different materials are compared and discussed. The advantages, disadvantages, and biomechanical concept of different implant-abutment connections are presented. The location of connections in relation to the bone level and the influence of microgap between the abutment and implant are described. Additionally, the implant abutments for cemented and screwed prosthetic restorations are compared. The influence of implant and abutment surface at the transmucosal level on peri-implant soft tissue is discussed. Finally, the biological aspect of abutment-implant connection is analyzed.
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17
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Fabris D, Moura JPA, Fredel MC, Souza JCM, Silva FS, Henriques B. Biomechanical analyses of one-piece dental implants composed of titanium, zirconia, PEEK, CFR-PEEK, or GFR-PEEK: Stresses, strains, and bone remodeling prediction by the finite element method. J Biomed Mater Res B Appl Biomater 2021; 110:79-88. [PMID: 34173713 DOI: 10.1002/jbm.b.34890] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 05/22/2021] [Accepted: 06/07/2021] [Indexed: 11/06/2022]
Abstract
This work aimed to assess the biomechanics, using the finite element method (FEM), of traditional titanium Morse taper (MT) dental implants compared to one-piece implants composed of zirconia, polyetheretherketone (PEEK), carbon fiber-reinforced PEEK (CFR-PEEK), or glass fiber-reinforced PEEK (GFR-PEEK). MT and one-piece dental implants were modeled within a mandibular bone section and loaded on an oblique force using FEM. A MT implant system involving a Ti6Al4V abutment and a cp-Ti grade IV implant was compared to one-piece implants composed of cp-Ti grade IV, zirconia (3Y-TZP), PEEK, CFR-PEEK, or GFR-PEEK. Stress on bone and implants was computed and analyzed while bone remodeling prediction was evaluated considering equivalent strain. In comparison to one-piece implants, the traditional MT implant revealed higher stress peak (112 MPa). The maximum stresses on the one-piece implants reached ~80 MPa, regardless their chemical composition. MT implant induced lower bone stimulus, although excessive bone strain was recorded for PEEK implants. Balanced strain levels were noticed for reinforced PEEK implants of which CFR-PEEK one-piece implants showed proper biomechanical behavior. Balanced strain levels might induce bone remodeling at the peri-implant region while maintaining low risks of mechanical failures. However, the strength of the PEEK-based composite materials is still low for long-term clinical performance.
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Affiliation(s)
- Douglas Fabris
- Ceramic and Composite Materials Research Group (CERMAT), Federal University of Santa Catarina (UFSC), Florianópolis, 88040-900, Brazil
| | - José P A Moura
- Ceramic and Composite Materials Research Group (CERMAT), Federal University of Santa Catarina (UFSC), Florianópolis, 88040-900, Brazil.,Center for MicroElectroMechanical Systems (CMEMS-UMinho), University of Minho, Braga, 4800-058, Portugal
| | - Márcio C Fredel
- Ceramic and Composite Materials Research Group (CERMAT), Federal University of Santa Catarina (UFSC), Florianópolis, 88040-900, Brazil
| | - Júlio C M Souza
- Center for MicroElectroMechanical Systems (CMEMS-UMinho), University of Minho, Braga, 4800-058, Portugal.,School of Dental Sciences, University Institute of Health Sciences (IUCS), CESPU, Gandra PRD, 4585-116, Portugal
| | - Filipe S Silva
- Center for MicroElectroMechanical Systems (CMEMS-UMinho), University of Minho, Braga, 4800-058, Portugal
| | - Bruno Henriques
- Ceramic and Composite Materials Research Group (CERMAT), Federal University of Santa Catarina (UFSC), Florianópolis, 88040-900, Brazil.,Center for MicroElectroMechanical Systems (CMEMS-UMinho), University of Minho, Braga, 4800-058, Portugal
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18
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Cytotoxic effects of submicron- and nano-scale titanium debris released from dental implants: an integrative review. Clin Oral Investig 2021; 25:1627-1640. [PMID: 33616805 DOI: 10.1007/s00784-021-03785-z] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Accepted: 01/07/2021] [Indexed: 12/12/2022]
Abstract
OBJECTIVE This integrative review aimed to report the toxic effect of submicron and nano-scale commercially pure titanium (cp Ti) debris on cells of peri-implant tissues. MATERIALS AND METHODS A systematic search was carried out on the PubMed electronic platform using the following key terms: Ti "OR" titanium "AND" dental implants "AND" nanoparticles "OR" nano-scale debris "OR" nanometric debris "AND" osteoblasts "OR "cytotoxicity" OR "macrophage" OR "mutagenic" OR "peri-implantitis". The inclusion criteria involved articles published in the English language, until December 26, 2020, reporting the effect of nano-scale titanium particles as released from dental implants on the toxicity and damage of osteoblasts. RESULTS Of 258 articles identified, 14 articles were selected for this integrative review. Submicron and nano-scale cp Ti particles altered the behavior of cells in culture medium. An inflammatory response was triggered by macrophages, fibroblasts, osteoblasts, mesenchymal cells, and odontoblasts as indicated by the detection of several inflammatory mediators such as IL-6, IL-1β, TNF-α, and PGE2. The formation of a bioactive complex composed of calcium and phosphorus on titanium nanoparticles allowed their binding to proteins leading to the cell internalization phenomenon. The nanoparticles induced mutagenic and carcinogenic effects into the cells. CONCLUSIONS The cytotoxic effect of debris released from dental implants depends on the size, concentration, and chemical composition of the particles. A high concentration of particles on nanometric scale intensifies the inflammatory responses with mutagenic potential of the surrounding cells. CLINICAL RELEVANCE Titanium ions and debris have been detected in peri-implant tissues with different size, concentration, and forms. The presence of metallic debris at peri-implant tissues also stimulates the migration of immune cells and inflammatory reactions. Cp Ti and TiO2 micro- and nano-scale particles can reach the bloodstream, accumulating in lungs, liver, spleen, and bone marrow.
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19
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Barreiros P, Braga J, Faria-Almeida R, Coelho C, Teughels W, Souza JCM. Remnant oral biofilm and microorganisms after autoclaving sterilization of retrieved healing abutments. J Periodontal Res 2020; 56:415-422. [PMID: 33368278 DOI: 10.1111/jre.12834] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 11/18/2020] [Accepted: 12/02/2020] [Indexed: 12/21/2022]
Abstract
OBJECTIVE The purpose of this study was to evaluate the sterilization effectiveness against biofilms on retrieved healing abutments used in implant dentistry. BACKGROUND A large number of clinicians reuse healing abutments to decrease treatment costs although it can promote infection due to the presence of remnant biofilm biomass. METHODS One hundred and eighty-five titanium healing abutments previously used for 3 months in oral cavity were assessed in this study. Abutments were submitted to cleaning, chemical disinfection, and autoclave sterilization according to clinical guidelines. The abutments were aseptically placed into glass tubes containing specific bacterial growth medium and then incubated for 10 days. From glass tubes with bacterial growth, 100 µl medium was transferred to Schaedler's agar for morphological identification and counting of strict anaerobes and to Columbia blood agar for presumptive identification of facultative anaerobes after incubation. Isolated strains were then identified at species level by enzymatic and biochemical tests within API microorganism detection platform. Also, polymerase chain reaction (PCR) was performed for identification of undefined strains. RESULTS After the standard cleaning and sterilization procedures, fifty-six (approximately 30%) retrieved abutments showed the presence of remnant biofilm biomass. The bacteria identified into the remnant biofilms covering the abutments were representative of the commensal oral microbiota including Aggregatibacter actinomycetemcomitans, Prevotella intermedia, and Enterococcus faecalis. CONCLUSION Although some healing abutments did not reveal the existence of bacteria, organic components from biofilm biomass are still strongly adhered on the retentive micro-regions and surfaces of abutments and therefore that would support the accumulation of biofilm including pathogenic species leading to patients' cross-infections. Further studies should be performed on the assessment of different materials, design, and connections of the healing abutments associated with clinical disinfection procedures in implant dentistry.
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Affiliation(s)
- Pedro Barreiros
- Division of Oral Surgery, School of Dentistry (FMDUP), University of Porto, Porto, 4200-393, Portugal.,Department of Dental Sciences, University Institute of Health Sciences (IUCS), CESPU, Gandra PRD, 4585-116, Portugal
| | - João Braga
- Division of Oral Surgery, School of Dentistry (FMDUP), University of Porto, Porto, 4200-393, Portugal
| | - Ricardo Faria-Almeida
- Division of Oral Surgery, School of Dentistry (FMDUP), University of Porto, Porto, 4200-393, Portugal
| | - Cristina Coelho
- Department of Dental Sciences, University Institute of Health Sciences (IUCS), CESPU, Gandra PRD, 4585-116, Portugal
| | - Wim Teughels
- Department of Oral Health Sciences, Periodontology, Dentistry, University Hospitals Leuven, Katholieke Universiteit Leuven, Leuven, 3000, Belgium
| | - Júlio C M Souza
- Department of Dental Sciences, University Institute of Health Sciences (IUCS), CESPU, Gandra PRD, 4585-116, Portugal.,Center for Microelectromechanical Systems (CMEMS-UMINHO), University of Minho, Guimarães, Braga, 4800-058, Portugal
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20
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Shnaekel AW, Mayes WH, Stambough JB, Edwards PK, Mears SC, Barnes CL. Dissociation of Acetabular Polyethylene Liners With a Morse Taper Design. J Arthroplasty 2020; 35:3754-3757. [PMID: 32684399 DOI: 10.1016/j.arth.2020.06.068] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 06/18/2020] [Accepted: 06/23/2020] [Indexed: 02/02/2023] Open
Abstract
BACKGROUND Polyethylene liner dissociation is an uncommon complication of hip replacement. Dissociation has been associated with particular acetabular component designs. This study reviewed acetabular liner dissociations in a specific modular cup with a Morse taper locking mechanism that has not been previously reported. METHODS The senior author performed 655 primary total hip arthroplasties with one particular design of acetabular component using Class A polyethylene liners and metal head articulation. Cases with revision surgery performed for acetabular liner dissociation were reviewed. RESULTS Seven of 655 patients with this cup underwent revision surgery for a dissociated liner. Liner dissociation occurred at a mean of 73 months postoperatively. Patients presented with new-onset hip pain or squeaking, 4 of which developed symptoms acutely. Two patients treated with polyethylene liner exchange into the same cup required a second revision surgery for recurrent dissociation. CONCLUSION Polyethylene liner dissociation is an infrequent but possible complication associated with modular acetabular components using a Morse taper locking. Providers should be vigilant with long-term follow-up of patients with this acetabular system for patient complaints of catching or squeaking. Patients treated for liner dissociation should not have a new liner placed into the same acetabular shell given the risk for further dissociation.
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Affiliation(s)
- Asa W Shnaekel
- Department of Orthopaedic Surgery, University of Arkansas for Medical Sciences, Little Rock, Arkansas
| | - Wesley H Mayes
- Department of Orthopaedic Surgery, University of Arkansas for Medical Sciences, Little Rock, Arkansas
| | - Jeffrey B Stambough
- Department of Orthopaedic Surgery, University of Arkansas for Medical Sciences, Little Rock, Arkansas
| | - Paul K Edwards
- Department of Orthopaedic Surgery, University of Arkansas for Medical Sciences, Little Rock, Arkansas
| | - Simon C Mears
- Department of Orthopaedic Surgery, University of Arkansas for Medical Sciences, Little Rock, Arkansas
| | - C Lowry Barnes
- Department of Orthopaedic Surgery, University of Arkansas for Medical Sciences, Little Rock, Arkansas
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21
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Souza JC, Correia MS, Oliveira MN, Silva FS, Henriques B, Novaes de Oliveira AP, Gomes JR. PEEK-matrix composites containing different content of natural silica fibers or particulate lithium‑zirconium silicate glass fillers: Coefficient of friction and wear volume measurements. ACTA ACUST UNITED AC 2020. [DOI: 10.1016/j.biotri.2020.100147] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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22
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Marginal Bone Loss in Implants with External Connection versus Internal Conical Connection Prior to Prosthetic Loading. A Randomized Clinical Study. COATINGS 2020. [DOI: 10.3390/coatings10111044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Introduction: The prosthetic connection of implants has been related to the loss of marginal bone. The aim of this study was to evaluate bone loss around external connection (EC) and internal conical connection (ICC) implants prior to prosthetic loading. Material and methods: A randomized clinical trial (RCT) was carried out, with a sample size of 93 implants (31 EC and 62 ICC) placed in 27 patients. Radiological controls were performed and stability was measured by resonance frequency analysis (RFA) on the day of placement, at 1 month and at 4 months after the placement. Results: Bone loss in EC implants was not statistically different than in ICC implants between the time of placement (T0) and the subsequent month (T1): (EC = 0.18 mm and ICC = 0.17 mm). Between one month (T1) and four months (T2): (EC = 0.39 mm and ICC = 0.19 mm) this difference was highly significant (p = 0.00). Bone loss between T0 and T2 was significantly lower in the ICC (EC = 0.57 mm and ICC = 0.36 mm), (p = 0.01). The overall success rate of the implants was 97.8%. The stability of the implants increased from 70.69 (T0) to 73.91 (T1) and 75.32 (T2). Conclusions: ICC showed less bone loss up to the time of prosthesis placement. Such bone loss did not have a significant impact on bone stability. Long term RCTs are needed to demonstrate whether this bone loss, which is more pronounced at the beginning in EC, tends to stabilize and equate to ICC.
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Abstract
PURPOSE The concept of biological width has been proposed and widely used in oral implantation. This review aimed to summarize the biological width around implant in detail. STUDY SELECTION An electronic search of the literature prior to March 2019 was performed to identify all articles related to biological width in periimplant soft tissue. The search was conducted in the MEDLINE (National Library of Medicine) database accessed through PubMed with no date restriction. The following main keywords were used: "implant", "biological width", "soft tissue", "junctional epithelium", "peri-implant epithelium", "connective tissue", "gingiva", "mucosa" (connecting multiple keywords with AND, OR). RESULTS The identified researches focused on several aspects related to biological width in oral implantation, namely the concept, formation, remodeling, dimension, structure and function. CONCLUSIONS Based on of the reviewed literature, the concept, formation, remodeling, structure, dimension, and functional significances of periimplant biological width are explored in this narrative review. The formation of biological width around implant is a complex process after several weeks of healing. The biological width around implant is a 3-4mm distance from the top of the peri-implant mucosa to the first bone-to-implant contact or the stabilized top of the adjacent bone, consisting of sulcular epithelium, junctional epithelium and fibrous connective tissue between the epithelium and the first bone-to-implant contact or the stabilized top of the adjacent bone. The biological width forms a biological barrier against the bacteria, influences the remodeling of soft and hard tissue around implant and has implications for clinical aspects of dental implantation.
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Affiliation(s)
- Zheng Zheng
- Graduate Prosthodontics, State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital
| | - Xiaogang Ao
- Graduate Prosthodontics, State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital
| | - Peng Xie
- Graduate Prosthodontics, State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital
| | - Fan Jiang
- Department of Stomatology, the Affiliated Hospital of North Sichuan Medical College, Nanchong, Sichuan, China
| | - Wenchuan Chen
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Chengdu, China and Department of Oral Prosthodontics
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Influence of Implant Connection, Abutment Design and Screw Insertion Torque on Implant-Abutment Misfit. J Clin Med 2020; 9:jcm9082365. [PMID: 32722131 PMCID: PMC7463581 DOI: 10.3390/jcm9082365] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 07/18/2020] [Accepted: 07/22/2020] [Indexed: 12/26/2022] Open
Abstract
Background: An accurate fit at the implant-abutment interface is an important factor to avoid biological and mechanical complications. The aim of this study was to evaluate the marginal misfit at the implant-abutment interface on external and Morse taper connection, with straight and angulated abutments under different insertion torque loads. Materials and Methods: A total of 120 implants were used, 60 with external connection (EC) and 60 with Morse taper connection (IC). Straight (SA) (n = 60) and angulated abutments (AA) (n = 60) were randomly screwed to each connection at different torque levels (n = 10 each): 10, 20 and 30 Ncm. All specimens were subjected to thermal and cyclic loading and the misfit was measured by scanning electron microscopy. Data were analyzed with one-way ANOVA, t-test and Kruskal-Wallis test. Results: Significant differences (p < 0.001) were found between connections and abutments regardless of the torque applied. Morse taper connections with straight and angulated abutments showed the lowest misfit values (0.6 µm). Misfit values decreased as torque increased. Conclusions: The misfit was affected by the type of connection. The type of abutment did not influence the fit in the Morse taper connection. The higher the tightening torque applied the increase in the fit of the implant-abutment interface.
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Santiago JF, Lemos CAA, de Luna Gomes JM, Verri FR, Moraes SLD, Pellizzer EP. Quality Assessment of Systematic Reviews on Platform-Switching vs Platform-Matched Implants: An Overview. J ORAL IMPLANTOL 2020; 46:153-162. [PMID: 31905050 DOI: 10.1563/aaid-joi-d-19-00114] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The objective of this study was to perform a quality analysis of systematic reviews with meta-analyses that focused on the comparison of platform-switching (implant-abutment mismatching) and platform-matched (PM) implants. The assessment of multiple systematic reviews (AMSTAR) and Glenny (Checklist) Scales were used to qualify the studies. PubMed, Scientific Electronic Library Online (SciELO), Web of Science (formerly ISI Web of Knowledge), and Cochrane databases were searched, by topic, for systematic reviews on dental implants with switching platforms. A total of 8 systematic reviews, including 7 studies with meta-analyses, were selected. The AMSTAR scale indicated a high (n = 6) to moderate (n = 2) score for the included studies. The quantitative analysis indicated that platform-switching implants preserved more bone tissue when compared with platform-matched implants (6 meta-analyses; P < .001, smaller mean difference: -0.29 mm, 95% CI: -0.38, -0.19 and greater mean difference: -0.49 mm, 95% CI: -0.73, -0.26). Quantitative analysis based on 7 systematic reviews with meta-analysis indicated positive peri-implant bone preservation for implants restored with an implant-abutment mismatching (PSW). Further, there is evidence to improve the design of current systematic reviews. Future systematic reviews in this thematic area should consider searches in gray literature and different databases and include only randomized controlled clinical studies.
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Affiliation(s)
| | | | | | - Fellippo Ramos Verri
- Dental School of Araçatuba, UNESP-Universidade Estadual Paulista, Araçatuba, São Paulo, Brazil
| | | | - Eduardo Piza Pellizzer
- Dental School of Araçatuba, UNESP-Universidade Estadual Paulista, Araçatuba, São Paulo, Brazil
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Influence of the implant-abutment connection on the ratio between height and thickness of tissues at the buccal zenith: a randomized controlled trial on 188 implants placed in 104 patients. BMC Oral Health 2020; 20:53. [PMID: 32066431 PMCID: PMC7027242 DOI: 10.1186/s12903-020-1037-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 02/06/2020] [Indexed: 02/06/2023] Open
Abstract
Background To compare tissue response to two implant systems, featuring internal hexed connections with different designs. Methods Patients enrolled in this randomized controlled trial were assigned to two groups. In Group 1, patients were treated with implants with a 5° conical internal hexed connection (Anyridge®, MegaGen, South Korea). In Group 2, patients were treated with implants with an internal hexed connection (Core®, Kristal, Italy). After implant placement and a provisionalisation period of 12 months, impressions were taken, stone casts were poured and digitised with a desktop scanner (D700®, 3Shape, Copenhagen, Denmark). In a digital environment, for each fixture, two values were collected at the buccal zenith: the height of the peri-implant mucosa (mucosal height; MH), calculated from the vestibular shoulder of the implant analogue to the upper gingival margin of the supra-implant tissue; and the width of the peri-implant mucosa (mucosal thickness; MT), calculated from the vestibular shoulder of the analogue to the external mucosa point perpendicular to the implant major axis. The mean and standard deviation for MH and MT, as well as their ratios, were calculated for each group; the sectors in which the implants were placed were also considered. Finally, correlation between MH, MT, connection type and sector was assessed by Pearson’s correlation coefficient, with significance level set at 0.05, and a confidence interval (CI) set at 95%. Results Data deriving from 188 implants placed in 104 patients were evaluated. The mean MH values were 3.32 (± 0.12) and 2.70 (± 0.16) mm for Groups 1 and 2, respectively. The mean MT values were 4.37 (± 0.16) and 3.93 (± 0.18) mm for Groups 1 and 2, respectively. Group 1 showed higher MH and MT values and a better ratio (1.50 ± 0.88) than Group 2 (1.81 ± 1.20). The MH, MT and MH/MT ratio were significantly influenced both by sector (p = 0.015) and group (p = 0.047). Conclusions Within the limits of this study, the 5° connection implants supported a more extended tissue height and thickness at the buccal zenith, and a better ratio between them. Trial registration This study was retrospectively registered in Clinicaltrials.gov, with number NCT04160689, dated 13/11/2019.
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Deschamps IS, Magrin GL, Magini RS, Fredel MC, Benfatti CAM, Souza JCM. On the synthesis and characterization of β-tricalcium phosphate scaffolds coated with collagen or poly (D, L-lactic acid) for alveolar bone augmentation. Eur J Dent 2019; 11:496-502. [PMID: 29279677 PMCID: PMC5727736 DOI: 10.4103/ejd.ejd_4_17] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Objectives: After tooth loss, dimensional alterations on the alveolar bone ridge can occur that can negatively affect the placement of dental implants. The purpose of this study was to evaluate the synthesis, and mechanical properties of β-tricalcium phosphate (β-TCP) scaffolds coated with bioabsorbable polymers, namely, collagen and poly (D, L-lactic acid) (PDLLA). Materials and Methods: β-TCP powder was obtained by reactive milling and then characterized by X-ray diffraction and scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDS). β-TCP scaffolds were obtained by replica method, in which polyurethane foams are immersed in β-TCP suspension and thereafter submitted to a thermal treatment to remove the polyurethane and sinter the ceramic. Type-I collagen or PDLLA were used to coat the β-TCP scaffolds by dip-coating method. Scaffolds were separated in four groups depending on the coating material: noncoated (Group A), double immersion in collagen (Group B), double immersion in PDLLA (Group C), and ten immersions in PDLLA (Group D). Samples were characterized by compressive tests and SEM/EDS. Data were statistically analyzed through two-way ANOVA (p = 0.05). Results: Chemical and microscopic analyses revealed proper morphology and chemical composition of powder particles and scaffolds with or without polymeric coatings. Scaffolds coated with PDLLA showed higher compressive strength (0.11 ± 0.054 MPa) than those of collagen (0.022 ± 0.012 MPa) or noncoated groups (0.024 ± 0.012 MPa). Conclusions: The coating method of β-TCP with PDLLA revealed a potential strategy to increase the mechanical strength of porous ceramic materials while collagen can enhance cell migration.
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Affiliation(s)
- Isadora S Deschamps
- Department of Mechanical Engineering (EMC), Ceramic and Composite Materials Research Laboratories (CERMAT), Federal University of Santa Catarina (UFSC), Florianópolis, 88040-900, Santa Catarina, Brazil
| | - Gabriel L Magrin
- Department of Dentistry (ODT), Center for Education and Research on Dental Implants (CEPID), Postgraduation Program in Dentistry (PPGO), Federal University of Santa Catarina (UFSC), Florianópolis, 88040-900, Santa Catarina, Brazil
| | - Ricardo S Magini
- Department of Dentistry (ODT), Center for Education and Research on Dental Implants (CEPID), Postgraduation Program in Dentistry (PPGO), Federal University of Santa Catarina (UFSC), Florianópolis, 88040-900, Santa Catarina, Brazil
| | - Márcio C Fredel
- Department of Mechanical Engineering (EMC), Ceramic and Composite Materials Research Laboratories (CERMAT), Federal University of Santa Catarina (UFSC), Florianópolis, 88040-900, Santa Catarina, Brazil
| | - Cesar A M Benfatti
- Department of Dentistry (ODT), Center for Education and Research on Dental Implants (CEPID), Postgraduation Program in Dentistry (PPGO), Federal University of Santa Catarina (UFSC), Florianópolis, 88040-900, Santa Catarina, Brazil
| | - Júlio C M Souza
- Department of Mechanical Engineering (EMC), Ceramic and Composite Materials Research Laboratories (CERMAT), Federal University of Santa Catarina (UFSC), Florianópolis, 88040-900, Santa Catarina, Brazil.,Department of Dentistry (ODT), Center for Education and Research on Dental Implants (CEPID), Postgraduation Program in Dentistry (PPGO), Federal University of Santa Catarina (UFSC), Florianópolis, 88040-900, Santa Catarina, Brazil
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Pereira LMS, Sordi MB, Magini RS, Calazans Duarte AR, Souza JCM. Abutment misfit in implant-supported prostheses manufactured by casting technique: An integrative review. Eur J Dent 2019; 11:553-558. [PMID: 29279686 PMCID: PMC5727745 DOI: 10.4103/ejd.ejd_162_17] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
The aim of this study was to perform an integrative review of the literature on the clinically usual prosthesis-abutment misfit over implant-supported structures manufactured by conventional casting technique. The present integrative review used the PRISMA methodology. A bibliographical search was conducted on the following electronic databases: MEDLINE/PubMed (National Library of Medicine), Scopus (Elsevier), ScienceDirect (Elsevier), Web of Science (Thomson Reuters Scientific), Latin American and Caribbean Center on Health Sciences Information (BIREME), and Virtual Health Library (BVS). A total of 11 relevant studies were selected for qualitative analysis. The prosthetic-abutment vertical misfit considered clinically usual ranged from 50 to 160 μm. The vertical misfit depends on several steps during technical manufacturing techniques, which includes the materials and technical procedures. Lower values in misfit are recorded when precious metal or titanium alloys are utilized. Although a vertical misfit mean value of 100 μm has been considered clinically usual, most of the previous studies included in this revision showed lower mean values.
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Affiliation(s)
- Lorena M S Pereira
- Department of Dentistry, Federal University of Rio Grande do Norte (UFRN), Natal/RN, 59060-000, Brazil
| | - Mariane B Sordi
- Center for Research on Dental Implants (CEPID), Post-graduate Program in Dentistry, School of Dentistry (ODT), Universidade Federal de Santa Catarina (UFSC), Florianópolis/SC, 88040-900, Brazil
| | - Ricardo S Magini
- Center for Research on Dental Implants (CEPID), Post-graduate Program in Dentistry, School of Dentistry (ODT), Universidade Federal de Santa Catarina (UFSC), Florianópolis/SC, 88040-900, Brazil
| | - Antônio R Calazans Duarte
- Department of Dentistry, Federal University of Rio Grande do Norte (UFRN), Natal/RN, 59060-000, Brazil
| | - Júlio C M Souza
- Center for Research on Dental Implants (CEPID), Post-graduate Program in Dentistry, School of Dentistry (ODT), Universidade Federal de Santa Catarina (UFSC), Florianópolis/SC, 88040-900, Brazil.,Center for MicroElectroMechanical Systems (CMEMS-UMINHO), University of Minho, Portugal
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Liu J, Huang Q, Wang X, Li Y, Zhou J, Zeng D, Jiang X, Zhao K, Zhou Y. Early loading of splinted implants in posterior mandible: Three-year results of a prospective multicenter study. Clin Oral Implants Res 2019; 30:1049-1058. [PMID: 31357237 DOI: 10.1111/clr.13518] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Revised: 07/06/2019] [Accepted: 07/14/2019] [Indexed: 12/30/2022]
Abstract
OBJECTIVE To evaluate the clinical outcomes of an early loading protocol of splinted implants with a fluoride-modified nanostructure surface and a tapered apex design for the therapy of posterior partial edentulism of mandible. MATERIALS AND METHODS One hundred and seven implants were placed in the mandible of 45 subjects at three centres in China. A minimum of two and a maximum of three implants were placed in an edentulous region using a one-stage protocol. Each subject received a screw-retained, splinted and fixed permanent prosthesis 6-8 weeks after surgery. Marginal bone level (MBL) change, implant survival and soft tissue health were assessed at 6, 12, 24 and 36 months after loading. A total of 92 implants from 40 subjects were recalled and investigated in this clinical trial. RESULTS After three-year loading, the survival rate of implant was 100%. On a subject level, there was a mean (±SD) marginal bone gain of 0.23 ± 0.48 mm at 36-month recall and the change in MBL was statistically significant (p = .00061) compared with time of loading. On an implant level, the change in MBL was statistically significant (p = .03914, p = .01494, p = .00000) at 12, 24 and 36 months of loading compared with time of loading. CONCLUSION Three-year data indicate that early loading protocol of splinted implants with a fluoride-modified nanostructure surface and a tapered apex design is feasible and safe for the therapy of partial edentulism in posterior mandible, which may contribute to bone gain when the suitable occlusal load and oral hygiene maintenance are kept.
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Affiliation(s)
- Jianzhang Liu
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, China
| | - Qingfeng Huang
- Department of Prosthodontics, Ninth People's Hospital, Shanghai Jiao Tong University, School of Medicine, Shanghai, China
| | - Xiaodong Wang
- Department of Prosthodontics, Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - Yan Li
- Department of Prosthodontics, Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - Jianfeng Zhou
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, China
| | - Deliang Zeng
- Department of Prosthodontics, Ninth People's Hospital, Shanghai Jiao Tong University, School of Medicine, Shanghai, China
| | - Xinquan Jiang
- Department of Prosthodontics, Ninth People's Hospital, Shanghai Jiao Tong University, School of Medicine, Shanghai, China
| | - Ke Zhao
- Department of Prosthodontics, Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - Yongsheng Zhou
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, China.,National Clinical Research Centre for Oral Diseases, National Engineering Lab for Digital and Material Technology of Stomatology, Peking University School and Hospital of Stomatology, Beijing, China
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Sarkis-Onofre R, Marchini L, Spazzin AO, Santos MBFD. Randomized Controlled Trials in Implant Dentistry: Assessment of the Last 20 Years of Contribution and Research Network Analysis. J ORAL IMPLANTOL 2019; 45:327-333. [PMID: 31216256 DOI: 10.1563/aaid-joi-d-18-00276] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The aim of this study was to evaluate the characteristics of randomized controlled trials (RCTs) regarding implant-supported single tooth or fixed partial dentures. We performed searches (PubMed/MEDLINE and Web of Science) to identify all RCTs published from 1996 to 2016 and assessed publication details, study characteristics, international collaboration networks, and characteristics related to the implant-supported treatment. Two reviewers independently screened the titles/abstracts and selected full texts. A total of 122 RCTs were included, and most of the authors were from Europe (72%). Most trials did not report a trial registering number (89.9%) or sample size calculation (58.2%). The use of the CONSORT Statement increased over the past 9 years. Trials were mostly conducted at universities (54.9%), and only 13.1% compared 2 or more implant brands. Loading protocol was the most prevalent main comparison among the included studies, and most of the RCTs did not clearly report whether they excluded patients with known risk factors. The studies reviewed here presented different methodological and publication characteristics, and many did not show aspects aligned with current research practices.
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Affiliation(s)
| | - Leonardo Marchini
- Department of Preventive and Community Dentistry, The University of Iowa College of Dentistry and Dental Clinics, Iowa City, Ia
| | | | - Mateus B F Dos Santos
- Graduate Program in Dentistry, Federal University of Pelotas (UFPel), Pelotas, RS, Brazil
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Effect of Implant-Abutment Connection Type on Bone Around Dental Implants in Long-Term Observation: Internal Cone Versus Internal Hex. IMPLANT DENT 2019; 28:430-436. [PMID: 31188171 DOI: 10.1097/id.0000000000000905] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE The purpose of this study was to evaluate the influence of the implant-abutment connection type on the bone level around dental implants in long-term observation and the survival rate for the different types of implant-abutment connections. MATERIALS AND METHODS Two groups of implants made of titanium grade 23 alloy and with sandblasted and acid-etched (SLA) surface were included in the study: (a) the internal hex implant-abutment connection group (480 SPI dental implants; Alpha-Bio Tec, Petach Tikwa, Israel, 184 patients) and (b) the internal cone implant-abutment connection group (60 C1 dental implants; MIS Implant Technologies, Shlomi, Israel, 34 patients). Certain inclusion and exclusion criteria were applied. Marginal bone loss (MBL) around the dental implants was measured in intraoral radiographs taken with parallel technique with a film holder and by bite recording index. X-rays were performed at the moment of functional loading, and at 12, 24, 36, and 60 months after loading. The digital analysis was conducted using Dental Studio 2.0 computer software. RESULTS Average MBL was significantly lower in the conical connection compared with internal hex group-0.68 ± 0.59 versus 0.99 ± 0.89 mm (12 months), 0.78 ± 0.80 versus 1.12 ± 1.00 mm (24 months), 0.83 ± 0.87 versus 1.22 ± 1.03 mm (36 months), and 0.96 ± 1.02 versus 1.30 ± 1.15 mm (60 months after loading). Both groups of implants achieved a 100% survival rate. CONCLUSION The internal cone connection reduced bone resorption compared with the internal hex. Both groups of implants had a 100% survival rate.
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Kofron MD, Carstens M, Fu C, Wen HB. In vitro assessment of connection strength and stability of internal implant-abutment connections. Clin Biomech (Bristol, Avon) 2019; 65:92-99. [PMID: 31005695 DOI: 10.1016/j.clinbiomech.2019.03.007] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Revised: 03/01/2019] [Accepted: 03/11/2019] [Indexed: 02/07/2023]
Abstract
BACKGROUND Various connections have been machined to improve the fit between the dental abutment and implant. In vivo, the instability created by imprecisely fitting components can cause soft tissue irritation and bacterial colonization of the implant system. The aim of this study was to quantify abutment stability under in vitro force applications. METHODS Abutment stability and fit were quantitatively measured after application of rotational, vertical, and horizontal forces. FINDINGS The abutment connection held by friction (Friction-Fit) was the only group to have 0° angular rotation. A significantly greater vertical force was required to pull the abutment from the implant for the Friction-Fit connection as compared to all other experimental groups. The abutment connection held by a mechanically locking friction-fit with four grooves (CrossFit) and Friction-Fit demonstrated significantly lower lateral movement as compared to all other connections. The remaining connections evaluated included two hexagon connections that rely on screw placement for abutment fit (Conical + Hex #1 and Conical + Hex #2), one connection with protruding slots to align with recessed channels inside the implant (Conical + 6 Indexing Slots), and an internal connection that allows for abutment indexing every 120° (Internal Tri-Channel). INTERPRETATION Internal connection geometry influenced the degree of abutment movement. Friction-Fit and CrossFit connections exhibited the lowest rotational and horizontal motions. Significant differences were found between Friction-Fit and CrossFit following the application of a vertical force, with the Friction-Fit requiring a significantly greater pull force to separate the abutment from the implant.
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Affiliation(s)
- Michelle D Kofron
- Biomet 3i, LLC, a Zimmer Biomet company, 4555 Riverside Drive, Palm Beach Gardens, FL, United States.
| | - Matthew Carstens
- Biomet 3i, LLC, a Zimmer Biomet company, 4555 Riverside Drive, Palm Beach Gardens, FL, United States
| | - Cong Fu
- Biomet 3i, LLC, a Zimmer Biomet company, 4555 Riverside Drive, Palm Beach Gardens, FL, United States
| | - Hai Bo Wen
- Biomet 3i, LLC, a Zimmer Biomet company, 4555 Riverside Drive, Palm Beach Gardens, FL, United States
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Ratio between Height and Thickness of the Buccal Tissues: A Pilot Study on 32 Single Implants. Dent J (Basel) 2019; 7:dj7020040. [PMID: 30987026 PMCID: PMC6631890 DOI: 10.3390/dj7020040] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 03/29/2019] [Accepted: 03/30/2019] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Previous studies have suggested that mucosal height is related to the bone level and soft tissue thickness. The purpose of this pilot study was to investigate the ratio between the height and width of the tissues around single implants with a conical connection and platform switching. METHODS All patients receiving single implants (Anyridge®, MegaGen, Gyeongbuk, South Korea) and restored with single crowns, in a three-month period, were included in this study. After a provisionalization of 12 months, precision impressions were taken and stone casts were poured for measurements. For each implant, two values were collected at the buccal site: the mucosal height (MH), calculated from the vestibular shoulder of the implant to the upper gingival margin of the supra-implant tissue; and the mucosal thickness (MT), calculated from the vestibular shoulder of the analogue to the external mucosa point perpendicular to the implant major axis. Mean, standard deviation (SD), and confidence intervals (CI 95%) for MH and MT, as well as their ratios, were calculated. Correlation between MH and MT was assessed by Pearson's correlation coefficient, with significance level set at 0.05. RESULTS 32 single Anyridge® implants were eligible for this evaluation. The mean MH was 3.44 mm (±1.28), the mean MT was 3.29 (±1.46). The average of the ratio between MH and MT of the supra-implant mucosa was therefore 1:1.19 (±0.55). The relation between MH and MT was statistically significant at p ≤ 0.01 (Pearson two-tailed 95% CI). CONCLUSIONS Our study found a constant relationship between width and height of the peri-implant mucosa. However, our results are different from those of Nozawa et al., who found a ratio of 1:1.5 between height and thickness of the peri-implant tissues. This may be determined by the different sample and follow-up period, as well as by the implants used in our study.
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Macedo JP, Pereira J, Faria J, Souza JCM, Alves JL, López-López J, Henriques B. Finite element analysis of peri-implant bone volume affected by stresses around Morse taper implants: effects of implant positioning to the bone crest. Comput Methods Biomech Biomed Engin 2019; 21:655-662. [DOI: 10.1080/10255842.2018.1507025] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- J. Paulo Macedo
- School of Dentistry, Division of Oral surgery, Medicine and Implantology, School of Health Sciences (FCS), Fernando Pessoa University (UFP), Porto, Portugal
- Oral Health and Masticatory System Group (Bellvitge Biomedical Research Institute) IDIBELL, University of Barcelona, Barcelona, Spain
| | - Jorge Pereira
- School of Dentistry, Division of Oral surgery, Medicine and Implantology, School of Health Sciences (FCS), Fernando Pessoa University (UFP), Porto, Portugal
- Oral Health and Masticatory System Group (Bellvitge Biomedical Research Institute) IDIBELL, University of Barcelona, Barcelona, Spain
| | - João Faria
- Center for Microelectromechanical Systems (CMEMS-UMinho), University of Minho, Guimarães, Portugal
| | - Júlio C. M. Souza
- Center for Microelectromechanical Systems (CMEMS-UMinho), University of Minho, Guimarães, Portugal
| | - J. Luis Alves
- Center for Microelectromechanical Systems (CMEMS-UMinho), University of Minho, Guimarães, Portugal
| | - José López-López
- Oral Health and Masticatory System Group (Bellvitge Biomedical Research Institute) IDIBELL, University of Barcelona, Barcelona, Spain
| | - Bruno Henriques
- Center for Microelectromechanical Systems (CMEMS-UMinho), University of Minho, Guimarães, Portugal
- Ceramic and Composite Materials Research Group (CERMAT), Federal University of Santa Catarina (UFSC), Florianópolis, Brazil
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Zheng J, Chen X, Jiang W, Zhang S, Chen M, Yang C. An innovative total temporomandibular joint prosthesis with customized design and 3D printing additive fabrication: a prospective clinical study. J Transl Med 2019; 17:4. [PMID: 30602388 PMCID: PMC6317245 DOI: 10.1186/s12967-018-1759-1] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Accepted: 12/21/2018] [Indexed: 11/25/2022] Open
Abstract
Background Total temporomandibular joint (TMJ) prosthesis is an effective and reliable method of joint reconstruction. However, there is still an urgent need to design a new TMJ prosthesis because of no commercially available TMJ prosthesis appropriate for the clinical application on the Chinese population. This study was introduced to prospectively confirm the safety and effectiveness of a new TMJ prosthesis with customized design and 3D printing additive fabrication in clinical application. Methods Patients with unilateral end-stage TMJ osteoarthrosis were recruited in this study from Nov 2016 to Mar 2017. Computed tomography scans for all patients were obtained and transformed into three-dimensional (3D) reconstruction models. The customized TMJ prosthesis consisted of three components including the fossa, condylar head, and mandibular handle units, which were designed based on the anatomy of the TMJ and were fabricated using the 3D printing technology. The prominent characters of the prosthesis were the customized design of the fossa component with a single ultra-high-molecular-weight polyethylene and the connection mechanism between the condylar head (Co–Cr–Mo alloy) and mandibular handle components (Ti6Al4 V alloy). The clinical follow-up, radiographic evaluation and laboratory indices were all done to analyze the prosthesis’ outcomes in the clinical application. Results 12 consecutive patients were included in the study. There were no complications (infection of the surgical wound, damage of liver and kidney, displacement, breakage, or loosening of the prosthesis) found after surgery. Pain, diet, mandibular function, and maximal interincisal opening showed significant improvements after surgery. But the lateral movement was limited to the non-operated side and the mandible deviated towards the operated side on opening mouth following surgery. Conclusions The presented TMJ prosthesis is considered an innovative product in TMJ Yang’s system, which is unique compared to other prostheses for the special design and 3D printing additive manufacture. Moreover, the prosthesis is very safe and efficient for clinical use. Trial registration Prospective reports on Chinese customized total temporomandibular joint prosthesis reconstruction cases, ChiCTR-ONC-16009712. Registered 22 Nov 2016, http://www.chictr.org.cn/showproj.aspx?proj=16091
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Affiliation(s)
- JiSi Zheng
- Department of Oral Surgery, Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology, No. 639 Zhi Zao Ju Rd, Shanghai, 200011, China
| | - XuZhuo Chen
- Department of Oral Surgery, Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology, No. 639 Zhi Zao Ju Rd, Shanghai, 200011, China
| | - WenBo Jiang
- Center of 3D-printing Translational Medicine, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - ShanYong Zhang
- Department of Oral Surgery, Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology, No. 639 Zhi Zao Ju Rd, Shanghai, 200011, China
| | - MinJie Chen
- Department of Oral Surgery, Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology, No. 639 Zhi Zao Ju Rd, Shanghai, 200011, China
| | - Chi Yang
- Department of Oral Surgery, Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology, No. 639 Zhi Zao Ju Rd, Shanghai, 200011, China.
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MACHADO RCM, THOMÉ G, BERNARDES SR, MELO ACM. Morse taper implant macrodesign, loading protocol and site of installation – retrospective study of 5,601 implants. REVISTA DE ODONTOLOGIA DA UNESP 2019. [DOI: 10.1590/1807-2577.06919] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Abstract Introduction The long-term implant-supported prosthetic rehabilitation monitoring is extremely important in evaluating parameters that could interfere in the success of the treatment. Objective To evaluate the influence of macrodesign (shape of the body and apex), length and diameter, insertion torque, site of installation as well as the loading protocol, on long-term survival rates. Material and method The data obtained was from the medical records of rehabilitated patients who had had at least one Morse taper implant surgery done at ILAPEO School between 2006 -2012. Incomplete medical records, from which it would have been impossible to extract all data essential to complete the study, were excluded. Result A total of 1,142 patient’s medical records comprised the sample; documenting the progress of 5,601 implants, done in both jaws and mandibles. The final survival rate was 98.31%, over an average time of 37.54 months. The type of implant most used was cylindrical (70.33%). The mean installation torque most evidenced in the study was between 41 and 50 Ncm. A logistical regression analysis showed that none of the following variables, site of installation, body and apex shape designs and length, had any significant statistical influence on implant loss. Torque increase and diameter influenced implant loss while immediate loading favored implant maintenance. Conclusion It can be concluded that Morse taper implants present a long-term survival rate that can be lowered by excessive torque, as well as by the diameter of the implant.
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Affiliation(s)
| | - Geninho THOMÉ
- Instituto Latino Americano de Pesquisa e Ensino Odontológico, Brasil
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Vahey BR, Sordi MB, Stanley K, Magini RS, Novaes de Oliveira AP, Fredel MC, Henriques B, Souza JC. Mechanical integrity of cement- and screw-retained zirconium-lithium silicate glass-ceramic crowns to Morse taper implants. J Prosthet Dent 2018; 120:721-731. [DOI: 10.1016/j.prosdent.2018.01.028] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Revised: 01/31/2018] [Accepted: 01/31/2018] [Indexed: 11/26/2022]
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Influence of Implant Neck Design on Peri-Implant Tissue Dimensions: A Comparative Study in Dogs. MATERIALS 2018; 11:ma11102007. [PMID: 30336579 PMCID: PMC6212799 DOI: 10.3390/ma11102007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/09/2018] [Revised: 09/26/2018] [Accepted: 10/06/2018] [Indexed: 11/28/2022]
Abstract
This in vivo study assessed (hard and soft) peri-implant tissue remodeling around implants with micro-ring and open-thread neck designs placed in a dog model. Twenty histological sections corresponding to four different implant designs that were placed in America Foxhound dogs were obtained from previous studies. All the implants had been placed under identical conditions and were divided into four groups: Group A, micro-rings on implant neck plus 0.5 mm refined surface; Group B, micro-rings on implant neck; Group C, open-thread neck; and, Group D, double-spiral neck. Eight weeks after surgery, the integrated implants were removed and processed for histological examination. Crestal bone loss and bone-to-implant contact was greater for micro-ring necks than open-thread necks. Soft tissues showed significant differences on both buccal and lingual aspects, so that the distance from peri-implant mucosa to the apical portion of the barrier epithelium was smaller in the micro-ring groups. So, in spite of generating greater bone-to-implant contact, implants with micro rings produced more bone loss than open-thread implants. Moreover, the outcomes that were obtained IPX implants smooth neck design produced less bone loss in the cervical area, following by Facility implants when compared with the other open thread and microthreaded implant designs. Implant thread design can influence on bone remodeling in the cervical area, related to bundle bone preservation.
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Evaluation of Fatigue Behavior in Dental Implants from In Vitro Clinical Tests: A Systematic Review. METALS 2018. [DOI: 10.3390/met8050313] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Liu Y, Wang J. Influences of microgap and micromotion of implant-abutment interface on marginal bone loss around implant neck. Arch Oral Biol 2017; 83:153-160. [PMID: 28780384 DOI: 10.1016/j.archoralbio.2017.07.022] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2017] [Revised: 07/19/2017] [Accepted: 07/27/2017] [Indexed: 01/14/2023]
Abstract
OBJECTIVE To review the influences and clinical implications of micro-gap and micro-motion of implant-abutment interface on marginal bone loss around the neck of implant. DESIGN Literatures were searched based on the following Keywords: implant-abutment interface/implant-abutment connection/implant-abutment conjunction, microgap, micromotion/micromovement, microleakage, and current control methods available. The papers were then screened through titles, abstracts, and full texts. RESULTS A total of 83 studies were included in the literature review. Two-piece implant systems are widely used in clinics. However, the production error and masticatory load result in the presence of microgap and micromotion between the implant and the abutment, which directly or indirectly causes microleakage and mechanical damage. Consequently, the degrees of microgap and micromotion further increase, and marginal bone absorption finally occurs. We summarize the influences of microgap and micromotion at the implant-abutment interface on marginal bone loss around the neck of the implant. We also recommend some feasible methods to reduce their effect. CONCLUSIONS Clinicians and patients should pay more attention to the mechanisms as well as the control methods of microgap and micromotion. To reduce the corresponding detriment to the implant marginal bone, suitable Morse taper or hybrid connection implants and platform switching abutments should be selected, as well as other potential methods.
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Affiliation(s)
- Yang Liu
- Department of Prosthodontics, School of Stomatology, Wuhan University, Wuhan, 430079, China.
| | - Jiawei Wang
- Department of Prosthodontics, School of Stomatology, Wuhan University, Wuhan, 430079, China.
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Finite element analysis of stress extent at peri-implant bone surrounding external hexagon or Morse taper implants. J Mech Behav Biomed Mater 2017; 71:441-447. [DOI: 10.1016/j.jmbbm.2017.03.011] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Revised: 01/22/2017] [Accepted: 03/14/2017] [Indexed: 11/23/2022]
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de Moura MB, Rodrigues RB, Pinto LM, de Araújo CA, Novais VR, Júnior PCS. Influence of Screw Surface Treatment on Retention of Implant-Supported Fixed Partial Dentures. J ORAL IMPLANTOL 2017. [PMID: 28628390 DOI: 10.1563/aaid-joi-d-16-00145] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The aim of this study was to assess the effect of a diamond-like carbon (DLC) coating on the removal torque of prefabricated implant screws after cyclic loading. Four groups with two crowns supported by two implants (n = 5) were obtained according to splinted and nonsplinted prosthesis, using titanium or DLC screws (splinted crowns with titanium screw [STi], splinted crowns with DLC screw [SC], nonsplinted crowns and titanium screw [NSTi], and nonsplinted crowns and DLC screw [NSC]). The prosthetic screws were tightened at 32 Ncm and retightened, and the specimens were submitted to 106 mechanical cycles (4 Hz/98 N). After cyclic loading, loosening torque was evaluated, and the final measurements were performed. Data were analyzed by two-way analysis of variance and Tukey's test (α = .005). There was statistically significance in the interaction of screw × splinting (P = .003). For the group that used titanium screws, NSTi showed smaller removal torque compared with STi. It was concluded that the use of the DLC coating screws in nonsplinted prosthesis maintain the torque after cyclic loading.
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Affiliation(s)
- Marcos Boaventura de Moura
- 1 Department of Occlusion, Fixed Prosthodontics and Dental Materials, School of Dentistry, Federal University of Uberlandia, Uberlandia, Brazil
| | - Renata Borges Rodrigues
- 2 Department of Operative Dentistry and Dental Materials, Dental School, Federal University of Uberlandia, Uberlandia, Brazil
| | - Leandro Moreira Pinto
- 1 Department of Occlusion, Fixed Prosthodontics and Dental Materials, School of Dentistry, Federal University of Uberlandia, Uberlandia, Brazil
| | - Cleudmar Amaral de Araújo
- 3 Mechanical Projects Laboratory Henner A. Gomide, Mechanical School, Federal University of Uberlandia, Uberlandia, Brazil
| | - Veridiana Resende Novais
- 2 Department of Operative Dentistry and Dental Materials, Dental School, Federal University of Uberlandia, Uberlandia, Brazil
| | - Paulo Cézar Simamoto Júnior
- 1 Department of Occlusion, Fixed Prosthodontics and Dental Materials, School of Dentistry, Federal University of Uberlandia, Uberlandia, Brazil
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Apaza-Bedoya K, Tarce M, Benfatti CAM, Henriques B, Mathew MT, Teughels W, Souza JCM. Synergistic interactions between corrosion and wear at titanium-based dental implant connections: A scoping review. J Periodontal Res 2017; 52:946-954. [DOI: 10.1111/jre.12469] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/05/2017] [Indexed: 01/15/2023]
Affiliation(s)
- K. Apaza-Bedoya
- Center for Research on Dental Implants (CEPID); Post-Graduate Program in Dentistry (PPGO); School of Dentistry (ODT); Federal University of Santa Catarina (UFSC); Florianopolis Brazil
| | - M. Tarce
- Department of Oral Health Sciences; University Hospitals Leuven; Katholieke Universiteit Leuven; Leuven Belgium
| | - C. A. M. Benfatti
- Center for Research on Dental Implants (CEPID); Post-Graduate Program in Dentistry (PPGO); School of Dentistry (ODT); Federal University of Santa Catarina (UFSC); Florianopolis Brazil
| | - B. Henriques
- Center for Research on Dental Implants (CEPID); Post-Graduate Program in Dentistry (PPGO); School of Dentistry (ODT); Federal University of Santa Catarina (UFSC); Florianopolis Brazil
- Center for Microelectromechanical Systems (CMEMS); University of Minho; Guimarães Portugal
| | - M. T. Mathew
- Department of Biomedical Science; University of Illinois (UIC) School of Medicine; Rockford IL USA
- Department of Restorative Dentistry; University of Illinois (UIC) College of Dentistry; Chicago IL USA
| | - W. Teughels
- Department of Oral Health Sciences; University Hospitals Leuven; Katholieke Universiteit Leuven; Leuven Belgium
| | - J. C. M. Souza
- Center for Research on Dental Implants (CEPID); Post-Graduate Program in Dentistry (PPGO); School of Dentistry (ODT); Federal University of Santa Catarina (UFSC); Florianopolis Brazil
- Center for Microelectromechanical Systems (CMEMS); University of Minho; Guimarães Portugal
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Mishra SK, Chowdhary R, Kumari S. Microleakage at the Different Implant Abutment Interface: A Systematic Review. J Clin Diagn Res 2017; 11:ZE10-ZE15. [PMID: 28764310 DOI: 10.7860/jcdr/2017/28951.10054] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Accepted: 05/20/2017] [Indexed: 12/21/2022]
Abstract
INTRODUCTION Presence of gap at the implant-abutment interface, leads to microleakage and accumulation of bacteria which can affect the success of dental implants. AIM To evaluate the sealing capability of different implant connections against microleakage. MATERIALS AND METHODS In January 2017 an electronic search of literature was performed, in Medline, EBSCO host and Pubmed data base. The search was focused on ability of different implant connections in preventing microleakage. The related titles and abstracts available in English were screened, and the articles that fulfilled the inclusion criteria were selected for full text reading. RESULTS In this systematic review, literature search initially resulted in 78 articles among which 30 articles only fulfilled the criteria for inclusion and were finally included in the review. Almost all the studies showed that there was some amount of microleakage at abutment implant interface. Microleakage was very less in Morse taper implants in comparison to other implant connections. Majority of studies showed less microleakage in static loading conditions and microleakage increases in dynamic loading conditions. CONCLUSION In this systematic review maximum studies showed that there was some amount of microleakage at abutment implant interface. External hexagon implants failed completely to prevent microleakage in both static and dynamic loading conditions of implants. Internal hexagon implants mainly internal conical (Morse taper) implants are very promising in case of static loading and also showed less microleakage in dynamic loading conditions. Torque recommended by manufacturer should be followed strictly to get a better seal at abutment implant interface. Zirconia abutments are more to microleakage than Titanium abutments and there use should be discouraged. Zirconia abutments should be only restricted to cases where there was very high demand of aesthetics.
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Affiliation(s)
- Sunil Kumar Mishra
- Reader, Department of Maxillofacial Prosthodontics and Implantology, Peoples College of Dental Sciences and Research Centre, Bhopal, Madhya Pradesh, India
| | - Ramesh Chowdhary
- Professor, Department of Maxillofacial Prosthodontics and Implantology, Rajarajeswari Dental College and Hospital, Bangalore, Karnataka, India
| | - Shail Kumari
- Postgraduate Student, Department of Orthodontics and Dentofacial Orthopaedics, Rishiraj College of Dental Sciences and Research Centre, Bhopal, Madhya Pradesh, India
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Iezzi G, Iaculli F, Calcaterra R, Piattelli A, Di Girolamo M, Baggi L. Histological and Histomorphometrical Analysis on a Loaded Implant With Platform-Switching and Conical Connection: A Case Report. J ORAL IMPLANTOL 2017; 43:180-186. [PMID: 28301291 DOI: 10.1563/aaid-joi-d-16-00182] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The association of Morse taper implant-abutment design with the use of a smaller abutment diameter (platform switching) may improve dental implant success rate and prevent peri-implant bone loss. The aim of the present study was to histologically and histomorphometrically evaluate the behavior of peri-implant tissues around an implant with a conical connection associated with platform switching. A platform-switched Morse-cone connection implant was inserted in the left posterior mandible of a 61-year-old patient. The implant was inserted at the level of the alveolar crest. After 11 months from placement and 6 months of loading, the implant was retrieved for psychological reasons and processed for histological evaluation. The retrieved implant was wholly surrounded by bone tissue, except for a small area in the apical portion. At higher magnification, in the coronal portion of the implant, it was possible to observe bone directly at the implant platform level. No resorption of the coronal bone was present, except for 0.2 mm on the vestibular aspect. Crestally, bone remodeling with areas of newly formed bone was detected; the bone-implant contact was 73.9%. Apposition of bone was detected even upon the platform. Peri-implant crestal bone preservation can be achieved with the combination of Morse taper conical internal implant-abutment connection with the use of a smaller abutment diameter (platform-switching).
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Affiliation(s)
- Giovanna Iezzi
- 1 Department of Medical, Oral and Biotechnological Sciences, University "G. d'Annunzio" of Chieti-Pescara, Chieti, Italy
| | - Flavia Iaculli
- 1 Department of Medical, Oral and Biotechnological Sciences, University "G. d'Annunzio" of Chieti-Pescara, Chieti, Italy
| | - Roberta Calcaterra
- 2 Department of Social Dentistry, National Institute for Health, Migration and Poverty, Rome, Italy
| | - Adriano Piattelli
- 1 Department of Medical, Oral and Biotechnological Sciences, University "G. d'Annunzio" of Chieti-Pescara, Chieti, Italy
| | | | - Luigi Baggi
- 2 Department of Social Dentistry, National Institute for Health, Migration and Poverty, Rome, Italy.,3 School of Dentistry, University of Rome Tor Vergata, Rome, Italy
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de Melo LA, de Farias DB, de Medeiros AKB, Barbosa GAS, Dantas EM, Carreiro ADFP. Comparative evaluation of peri-implant tissues in patients wearing mandibular overdenture with different implant platforms. J Indian Soc Periodontol 2017; 21:473-477. [PMID: 29551866 PMCID: PMC5846244 DOI: 10.4103/jisp.jisp_228_17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND The poor hygiene of peri-implant tissues causes inflammation at tissue-implant interface, which may impair the rehabilitation success. The aim of this study was to evaluate the influence of external hexagon and Morse taper implants on peri-implant health in patients wearing mandibular overdentures for 1 year. MATERIALS AND METHODS A total of 46 implants were evaluated, 28 external hexagon and 18 Morse taper. Plaque index in the mini-abutment, bleeding index, peri-implant inflammation, keratinized mucosa zone, probing depth, and marginal mucosa level were evaluated after 3 months and 1 year of prostheses insertion. RESULTS Deeper probing was found in the external hexagon group compared with Morse taper (P = 0.024) after 1 year of rehabilitation. Although the Morse taper group exhibited worse scenario of peri-implant inflammation than the external hexagon group (P = 0.001), both groups showed reduced inflammation after 1 year. A larger keratinized mucosa zone was observed with external hexagon implants (P = 0.020). No significant difference was found between the groups for plaque index in the mini-abutment, bleeding index, and marginal mucosa level. CONCLUSION In a follow-up period of 1 year, it was concluded that the external hexagon group had a larger probing depth than the Morse taper group. However, better periodontal conditions about inflammation and keratinized mucosa zone were found in external hexagon implants. It was found no influence of implant platform on plaque index in the mini-abutment, bleeding index, and marginal mucosa level.
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Affiliation(s)
- Laércio Almeida de Melo
- Department of Dentistry, Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil,Address for correspondence: Dr. Laércio Almeida de Melo, Department of Dentistry, Federal University of Rio Grande do Norte, Av. Salgado Filho, 1787, Lagoa Nova, Natal, RN, CEP 59056-000, Brazil. E-mail:
| | | | | | | | - Euler Maciel Dantas
- Department of Dentistry, Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil
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Alveolar Ridge Reconstruction with Titanium Meshes and Simultaneous Implant Placement: A Retrospective, Multicenter Clinical Study. BIOMED RESEARCH INTERNATIONAL 2016; 2016:5126838. [PMID: 27999799 PMCID: PMC5141311 DOI: 10.1155/2016/5126838] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Accepted: 10/18/2016] [Indexed: 12/27/2022]
Abstract
Objective. To evaluate horizontal bone gain and implant survival and complication rates in patients treated with titanium meshes placed simultaneously with dental implants and fixed over them. Methods. Twenty-five patients treated with 40 implants and simultaneous guided bone regeneration with titanium meshes (i–Gen®, MegaGen, Gyeongbuk, Republic of Korea) were selected for inclusion in the present retrospective multicenter study. Primary outcomes were horizontal bone gain and implant survival; secondary outcomes were biological and prosthetic complications. Results. After the removal of titanium meshes, the CBCT evaluation revealed a mean horizontal bone gain of 3.67 mm (±0.89). The most frequent complications were mild postoperative edema (12/25 patients: 48%) and discomfort after surgery (10/25 patients: 40%); these complications were resolved within one week. Titanium mesh exposure occurred in 6 patients (6/25 : 24%): one of these suffered partial loss of the graft and another experienced complete graft loss and implant failure. An implant survival rate of 97.5% (implant-based) and a peri-implant marginal bone loss of 0.43 mm (±0.15) were recorded after 1 year. Conclusions. The horizontal ridge reconstruction with titanium meshes placed simultaneously with dental implants achieved predictable satisfactory results. Prospective randomized controlled trials on a larger sample of patients are required to validate these positive outcomes.
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