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Kamel MES, Alsayed AAE, ElKhashab MA, Nader N, Radi IA. Passive fit and time efficiency for prefabricated versus conventionally constructed cobalt chromium CAD\CAM 3-unit implant supported frameworks in free end saddle models: a pilot invitro study. BMC Oral Health 2024; 24:1225. [PMID: 39407141 PMCID: PMC11481720 DOI: 10.1186/s12903-024-04950-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2024] [Accepted: 09/23/2024] [Indexed: 10/19/2024] Open
Abstract
BACKGROUND The passive fit of 3-unit implant supported prefabricated metal screw-retained prosthesis before implant placement might be difficult. Hence, we aim to evaluate the passive fit and time efficiency of CAD/CAM 3-unit implant supported fixed prostheses that were constructed based on virtual versus those based on actual implant positions in Kennedy Class I models. METHODS A sample of 5 Kennedy class I models with thin wiry ridges were restored by 20 frameworks bilaterally, 10 based on actual (group A) and 10 based on virtual (group V) implant positions. The models were imaged using cone beam computed tomography and scanned using an intraoral scanner. The STL (Standard Tessellation Language files) and the DICOM (Digital Imaging and Communications in Medicine) files were registered on a 3D planning software. A CAD/CAM surgical guide was planned, resin printed and used for installing 6 implants bilaterally. In group V, the framework was designed based on the virtual scan bodies and virtual multi-unit abutments, while in group A intra-oral scanning of the model after attaching the scan bodies was necessary. Frameworks of both groups were milled and tested for passive fit using 8 clinical tests. McNemar and Wilcoxon signed rank tests were used to study the effect of the group on passive fit and time efficiency, respectively. The significance level was set at P ≤ 0.05. RESULTS No statistically significant difference was found between group V and group A frameworks regarding passive fit (p-value = 1, OR = 0.5) and time efficiency (P = 0.179, Effect size = 0.948). CONCLUSION Within the limitations of this study, it can be concluded that in free end saddle cases, prefabricated CAD\CAM 3-unit implant-supported cobalt chromium screw retained prostheses can achieve an adequate passive fit. However, their fit might be negatively affected in thin ridges and they might require some adjustments.
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Affiliation(s)
- Mohamed El-Sayed Kamel
- Master Degree Candidate of Oral Implantology, Faculty of Dentistry, Cairo Univeristy, Cairo, Egypt
| | | | | | - Nancy Nader
- Professor of Prosthodontics, Faculty of Dentistry, Cairo University , Cairo, Egypt
| | - Iman AbdelWahab Radi
- Professor of Prosthodontics and Member of Evidence Based Dentistry Centre, Faculty of Dentistry, Cairo University, Vice Dean of School of Dentistry, Badya University, 11 Al Saraya, Al Manial, Giza Governorate, Cairo, Egypt.
- Vice Dean of School of Dentistry, Badya University, Cairo, Egypt.
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Rk R, Hegde D, Mc J, Ummer H, Nazer N, Mk J. A Study to Evaluate the Effect of Cleaning Solutions on Shear Bond Strength of Resin Cement to Saliva-Contaminated Lithium Disilicate (LDS) Ceramic. Cureus 2023; 15:e44389. [PMID: 37779739 PMCID: PMC10541234 DOI: 10.7759/cureus.44389] [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: 07/25/2023] [Accepted: 08/29/2023] [Indexed: 10/03/2023] Open
Abstract
BACKGROUND One of the greatest benefits of contemporary restorative dentistry is the creation of fixed partial dentures. The retention and durability of the fixed partial dentures may be improved by using a variety of tooth preparation methods, surface treatments, and luting resins. AIM To measure the shear binding strength of resin cement to saliva-contaminated lithium disilicate (LDS) ceramic after being exposed to various cleaning treatments. METHODOLOGY Over 30 LDS samples were examined. In Group 1, a cleansing solution comprising 15% zirconium oxide (Ivoclean) was employed for a duration of 20 s. This was succeeded by a rinsing phase lasting 15 s utilizing deionized water, followed by a 15-s period for drying. Subsequently, a final stage of air drying was conducted over a span of 15 s. In contrast, Group 2 underwent a washing procedure of 20 s involving a cleansing solution containing 30% sodium silicate. This was then ensued by a rinsing interval of 15 s with deionized water, succeeded by an air-drying process spanning 15 s. After applying cleaning solutions to the surface and adhering the specimens to the composite blocks using resin cement Multilink Automix (Ivoclar Vivadent, Schaan, Liechtenstein), the shear bond strength was assessed. RESULTS Using a 30% sodium silicate solution (Group 2), we were able to get the highest mean shear bond strength value after saliva-contaminated LDS. Group 1, 15% zirconium oxide (Ivoclean) had the weakest decontamination agents as measured by mean shear bond strengths. The shear bond strength values of the two groups were found to vary significantly between individuals using the independent sample t-test. LDs ceramic cleaned with a 30% sodium silicate solution had a higher shear bond strength than ceramic cleaned with Ivoclean (p<0.05). CONCLUSION The application of a 30% sodium silicate solution rendered the highest shear bond strength for saliva-contaminated LDS ceramic. In comparison, ceramic cleaned with Ivoclean exhibited notably lower shear bond strength values. The outcome of this investigation highlights the potential of diverse cleaning agents in influencing the adhesive qualities of resin cement, thereby contributing to the enhancement of fixed partial denture durability and efficacy.
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Affiliation(s)
- Radhi Rk
- Prosthodontics, MES Dental College, Perinthalmanna, IND
| | - Divya Hegde
- Prosthodontics, Bangalore Institute of Dental Sciences, Bangalore, IND
| | - Juraise Mc
- Prosthodontics, MES Dental College, Perinthalmanna, IND
| | - Haseena Ummer
- Prosthodontics, MES Dental College, Perinthalmanna, IND
| | - Nadeem Nazer
- Prosthodontics, Kannur Dental College, Anjarakandy, IND
| | - Jyothsna Mk
- Prosthodontics, Educare Institute of Dental Sciences, Malappuram, IND
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Full Digital Workflow for Prosthetic Full-Arch Immediate Loading Rehabilitation Using OT-Bridge System: A Case Report. PROSTHESIS 2022. [DOI: 10.3390/prosthesis4020021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Nowadays, digital technologies have brought very important advancements in clinical prosthetic dentistry. However, a full digital workflow is still considered to be challenging in the management of full-arch implant cases with immediate prosthetic loading. The aim of this case report is to show a full-digital workflow for the fabrication of an implant-prosthetic fixed provisional prosthesis for immediate loading on seven implants in the upper maxilla. The static guided implant surgery and the OT Bridge prosthetic system were used to rehabilitate the patient. In this way, the combination of a well-known surgical technique with a peculiar prosthetic system that allows for a certain degree of tolerance resulted in it being useful for full-arch immediate loading. Future research and studies are necessary to prove the reliability of this full-digital protocol.
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Tisler CE, Chifor R, Badea ME, Moldovan M, Prodan D, Carpa R, Cuc S, Chifor I, Badea AF. Photodynamic Therapy (PDT) in Prosthodontics: Disinfection of Human Teeth Exposed to Streptococcus mutans and the Effect on the Adhesion of Full Ceramic Veneers, Crowns, and Inlays: An In Vitro Study. Biomedicines 2022; 10:144. [PMID: 35052823 PMCID: PMC8773555 DOI: 10.3390/biomedicines10010144] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 01/07/2022] [Accepted: 01/07/2022] [Indexed: 11/21/2022] Open
Abstract
The use of PDT in prosthodontics as a disinfection protocol can eradicate bacteria from tooth surfaces by causing the death of the microorganisms to which the photosensitizer binds, absorbing the energy of laser light during irradiation. The aim of the study was to investigate the capacity of PDT to increase the bond strength of full ceramic restorations. In this study, 45 extracted human teeth were prepared for veneers, crowns, and inlays and contaminated with Streptococcus mutans. Tooth surfaces decontamination was performed using a diode laser and methylene blue as a photosensitizer. The disinfection effect and the impact on tensile bond strength were evaluated by scanning electron microscopy (SEM) and pull-out tests of the cemented ceramic prosthesis. Results show that the number of bacteria was reduced from colonized prepared tooth surfaces, and the bond strength was increased when PDT was used. In conclusion, the present study indicates that using PDT as a protocol before the final adhesive cementation of ceramic restorations could be a promising approach, with outstanding advantages over conventional methods.
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Affiliation(s)
- Corina Elena Tisler
- Department of Prosthetic Dentistry and Dental Materials, Iuliu Hatieganu University of Medicine and Pharmacy, 32 Clinicilor Street, 400006 Cluj-Napoca, Romania;
| | - Radu Chifor
- Department of Preventive Dental Medicine, Iuliu Hatieganu University of Medicine and Pharmacy, Avram Iancu 31, 400083 Cluj-Napoca, Romania; (M.E.B.); (I.C.)
| | - Mindra Eugenia Badea
- Department of Preventive Dental Medicine, Iuliu Hatieganu University of Medicine and Pharmacy, Avram Iancu 31, 400083 Cluj-Napoca, Romania; (M.E.B.); (I.C.)
| | - Marioara Moldovan
- Department of Polymer Composites, Institute of Chemistry “Raluca Ripan”, University Babes-Bolyai, 400294 Cluj-Napoca, Romania; (M.M.); (D.P.)
| | - Doina Prodan
- Department of Polymer Composites, Institute of Chemistry “Raluca Ripan”, University Babes-Bolyai, 400294 Cluj-Napoca, Romania; (M.M.); (D.P.)
| | - Rahela Carpa
- Department of Molecular Biology and Biotechnology, Faculty of Biology and Geology, Babeș Bolyai University, 1 M. Kogălniceanu Street, 400084 Cluj-Napoca, Romania;
| | - Stanca Cuc
- Department of Polymer Composites, Institute of Chemistry “Raluca Ripan”, University Babes-Bolyai, 400294 Cluj-Napoca, Romania; (M.M.); (D.P.)
| | - Ioana Chifor
- Department of Preventive Dental Medicine, Iuliu Hatieganu University of Medicine and Pharmacy, Avram Iancu 31, 400083 Cluj-Napoca, Romania; (M.E.B.); (I.C.)
| | - Alexandru Florin Badea
- Department of Morphological Sciences, Discipline of Anatomy and Embryology, Faculty of General Medicine, Iuliu Hatieganu University of Medicine and Pharmacy, 3–5 Clinicilor Street, 400006 Cluj-Napoca, Romania;
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Vág J, Nagy Z, Bocklet C, Kiss T, Nagy Á, Simon B, Mikolicz Á, Renne W. Marginal and internal fit of full ceramic crowns milled using CADCAM systems on cadaver full arch scans. BMC Oral Health 2020; 20:189. [PMID: 32631333 PMCID: PMC7339429 DOI: 10.1186/s12903-020-01181-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Accepted: 06/29/2020] [Indexed: 11/25/2022] Open
Abstract
Background Chairside systems are becoming more popular for fabricating full-ceramic single restorations, but there is very little knowledge about the effect of the entire workflow process on restoration fit. Therefore, this study aimed to compare the absolute marginal discrepancy (AMD) and the full internal fit (FULL) of all-ceramic crowns made by two chairside systems, Planmeca FIT and CEREC, with detailed and standard mill settings. Methods One upper molar was prepared for an all-ceramic crown in human cadaver maxilla. Full-arch scans were made by Emerald or Omnicam four times each. Twenty-four e.max crowns were designed and milled by the Planmill 30s or 40s or CEREC MCXL mills with either detailed or standard settings. The cadaver tooth was extracted, and each crown was fixed on it and scanned by a high-resolution microCT scanner. The AMD and FULL were measured digitally in mesio-distal and bucco-lingual 2D slices. The actual and predicted times of the milling were also registered. Results No differences were observed between detailed or standard settings in either system. The AMD was significantly higher with CEREC (132 ± 12 μm) than with either Planmill 30s (71 ± 6.9 μm) or 40s (78 ± 7.7 μm). In standard mode, the FULL was significantly higher with CEREC (224 ± 9.6 μm) than with either Planmill 30s (169 ± 8.1 μm) or 40s (178 ± 8.5 μm). There was no difference between actual and predicted time with the two Planmeca models, but with CEREC, the actual time was significantly higher than the predicted time. The 30s had significantly higher actual and predicted times compared to all other models. Across all models, the average milling time was 7.2 min less in standard mode than in detailed mode. Conclusions All fit parameters were in an acceptable range. No differences in fit between Planmeca models suggest no effect of spindle number on accuracy. The detailed setting has no improvement in the marginal or internal fit of the restoration, yet it increases milling time.
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Affiliation(s)
- János Vág
- Department of Conservative Dentistry, Semmelweis University, Szentkirályi utca 47, Budapest, H-1088, Hungary.
| | - Zsolt Nagy
- Department of Conservative Dentistry, Semmelweis University, Szentkirályi utca 47, Budapest, H-1088, Hungary
| | - Christopher Bocklet
- College of Dental Medicine, Medical University of South Carolina, Charleston, SC, USA
| | - Tamás Kiss
- János Szentágothai Research Centre & Department of Pharmacology and Pharmacotherapy, Medical School, University of Pecs, Ifjúság útja 20, Pécs, H-7624, Hungary
| | - Ákos Nagy
- Department of Dentistry, Oral and Maxillofacial Surgery, University of Pecs, Pecs, Hungary
| | - Botond Simon
- Department of Conservative Dentistry, Semmelweis University, Szentkirályi utca 47, Budapest, H-1088, Hungary
| | - Ákos Mikolicz
- Department of Conservative Dentistry, Semmelweis University, Szentkirályi utca 47, Budapest, H-1088, Hungary
| | - Walter Renne
- Department of Oral Rehabilitation, College of Dental Medicine, Medical University of South Carolina, Charleston, SC, USA
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Tribst JP, Kohn BM, de Oliveira Dal Piva AM, Spinola MS, Borges AL, Andreatta Filho OD. Influence of restoration thickness on the stress distribution of ultrathin ceramic onlay rehabilitating canine guidance: a 3D-finite element analysis. ACTA ACUST UNITED AC 2019; 68:126-131. [PMID: 31014062 DOI: 10.23736/s0026-4970.19.04183-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND The rehabilitation of canine guidance can be performed with adhesive indirect materials, but can the restoration thickness be reduced without mechanical disadvantages? Thus the goal of this study was to analyze the stress of upper canines which received different thicknesses of ceramic fragments for the rehabilitation of the canine guidance using finite element analysis. METHODS A superior canine was modeled using a computer aided design software. The dental tissues were individually shaped containing enamel, dentin and periodontal ligament. The following three different ceramic fragment thicknesses were then implemented: 0.3, 0.7 and 1.5 mm. Lithium disilicate was chosen as the ceramic material. The solid geometries were exported to the analysis software. The materials were considered isotropic, homogeneous and linear. The set was submitted to efforts in the incisal third in the palatine face to analyze maximal principal stress, mimicking mandibular lateral movement. The applied load was 100N, and the fixation region was on the medullary bone. RESULTS For restoration, the thinner the ceramic, the higher the stress concentration was; while for the adhesive surface of teeth, the thicker the ceramic, the higher the stress concentration. CONCLUSIONS The smaller the ceramic thickness was, the lower stress concentration showed at the adhesive interface, while the stress concentration was higher on the restoration intaglio surface.
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Affiliation(s)
- João P Tribst
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University, Unesp, São José dos Campos, SP, Brazil
| | - Bianca M Kohn
- Institute of Science and Technology, São Paulo State University, Unesp, São José dos Campos, SP, Brazil
| | - Amanda M de Oliveira Dal Piva
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University, Unesp, São José dos Campos, SP, Brazil -
| | - Manuela S Spinola
- Department of Restorative Dentistry, Institute of Science and Technology, São Paulo State University, Unesp, São José dos Campos, SP, Brazil
| | - Alexandre L Borges
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University, Unesp, São José dos Campos, SP, Brazil
| | - Osvaldo D Andreatta Filho
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University, Unesp, São José dos Campos, SP, Brazil
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Nabil O, Halim CH, Mokhtar AH. Fracture resistance and 3D finite element analysis of machined ceramic crowns bonded to endodontically treated molars with two planes versus flat occlusal preparation designs: an in vitro study. F1000Res 2019; 8:1020. [PMID: 36483004 PMCID: PMC9706146 DOI: 10.12688/f1000research.19455.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/11/2019] [Indexed: 09/10/2024] Open
Abstract
Background: The flat occlusal preparation design (FOD) of posterior teeth offers promising results of fracture resistance and stress distribution, but its application in vital teeth is limited as there may be a danger of pulp injury. Although this danger is omitted in endodontically treated teeth, there is no research work assessing the impact of FOD on the fracture resistance and distribution of stresses among these teeth. The aim of this study was to assess the impact of FOD of endodontically treated molars on the fracture resistance and distribution of stresses among a ceramic crown-molar structure when compared to the two planes occlusal preparation design (TOD). Methods: 20 human mandibular molars were endodontically treated and distributed equally to two groups: Group I (TOD) and Group II (FOD). Ceramic CAD/CAM milled lithium disilicate (IPS e.max CAD) crowns were produced for all preparations and adhered using self-adhesive resin cement. Using a universal testing machine, the fracture resistance test was performed. The fractured samples were examined using a stereomicroscope and scanning electron microscope to determine modes of failure. Stress distribution was evaluated by 3D finite element analysis, which was performed on digital models of endodontically treated mandibular molars (one model for each design). Results: Group II recorded statistically non-significant higher fracture resistance mean values (3107.2± 604.9 N) than Group I mean values (2962.6 ±524.27 N) as indicated by Student's t-test (t=0.55, p= 0.57). Also, Group II resulted in more favorable failure mode as compared to Group I. Both preparation designs yielded low von-Mises stresses within the factor of safety. However, the stress distribution among different layers of the model differed. Conclusions: FOD having comparable fracture strength to TOD and a more favorable fracture behavior can be used for the preparation of endodontically treated molars.
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Affiliation(s)
- Omnia Nabil
- Department of Fixed Prosthodontics, Faculty of Dentistry, Cairo University, Cairo, 11553, Egypt
| | - Carl Hany Halim
- Department of Fixed Prosthodontics, Faculty of Dentistry, Cairo University, Cairo, 11553, Egypt
| | - Ashraf Hassan Mokhtar
- Department of Fixed Prosthodontics, Faculty of Dentistry, Cairo University, Cairo, 11553, Egypt
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Nabil O, Halim CH, Mokhtar AH. Fracture resistance and 3D finite element analysis of machined ceramic crowns bonded to endodontically treated molars with two planes versus flat occlusal preparation designs: an in vitro study. F1000Res 2019; 8:1020. [PMID: 36483004 PMCID: PMC9706146 DOI: 10.12688/f1000research.19455.2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/02/2021] [Indexed: 12/15/2022] Open
Abstract
Background: The flat occlusal preparation design (FOD) of posterior teeth offers promising results of fracture resistance and stress distribution, but its application in vital teeth is limited as there may be a danger of pulp injury. Although this danger is omitted in endodontically treated teeth, there is no research work assessing the impact of FOD on the fracture resistance and distribution of stresses among these teeth. The aim of this study was to assess the impact of FOD of endodontically treated molars on the fracture resistance and distribution of stresses among a ceramic crown-molar structure when compared to the two planes occlusal preparation design (TOD). Methods: 20 human mandibular molars were endodontically treated and distributed equally to two groups: Group I (TOD) and Group II (FOD). Ceramic CAD/CAM milled lithium disilicate (IPS e.max CAD) crowns were produced for all preparations and adhered using self-adhesive resin cement. Using a universal testing machine, the fracture resistance test was performed. The fractured samples were examined using a stereomicroscope and scanning electron microscope to determine modes of failure. Stress distribution was evaluated by 3D finite element analysis, which was performed on digital models of endodontically treated mandibular molars (one model for each design). Results: Group II recorded statistically non-significant higher fracture resistance mean values (3107.2± 604.9 N) than Group I mean values (2962.6 ±524.27 N) as indicated by Student's t-test (t=0.55, p= 0.57). Also, Group II resulted in more favorable failure mode as compared to Group I. Both preparation designs yielded low von-Mises stresses within the factor of safety. However, the stress distribution among different layers of the model differed. Conclusions: FOD having comparable fracture strength to TOD and a more favorable fracture behavior can be used for the preparation of endodontically treated molars.
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Affiliation(s)
- Omnia Nabil
- Department of Fixed Prosthodontics, Faculty of Dentistry, Cairo University, Cairo, 11553, Egypt
| | - Carl Hany Halim
- Department of Fixed Prosthodontics, Faculty of Dentistry, Cairo University, Cairo, 11553, Egypt
| | - Ashraf Hassan Mokhtar
- Department of Fixed Prosthodontics, Faculty of Dentistry, Cairo University, Cairo, 11553, Egypt
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Lawson NC, Litaker MS, Ferracane JL, Gordan VV, Atlas AM, Rios T, Gilbert GH, McCracken MS. Choice of cement for single-unit crowns: Findings from The National Dental Practice-Based Research Network. J Am Dent Assoc 2019; 150:522-530. [PMID: 31030937 PMCID: PMC6538426 DOI: 10.1016/j.adaj.2019.01.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Revised: 12/26/2018] [Accepted: 01/02/2019] [Indexed: 11/28/2022]
Abstract
BACKGROUND In this article, the authors present clinical factors associated with the type of cement practitioners use for restoration of single-unit crowns. METHODS A total of 202 dentists in The National Dental Practice-Based Research Network recorded clinical details (including cement type) used for 3,468 single-unit crowns. The authors classified crowns as bonded if the dentist used a resin cement. The authors used mixed-model logistic regression to assess the associations between various clinical factors and the dentist's decision to bond. RESULTS A total of 38.1% of crowns were bonded, and 61.9% were nonbonded; 39.1% (79 of 202) of dentists never bonded a crown, and 20.3% (41 of 202) of dentists bonded every crown in the study. Crowns with excessive occlusal reduction (as judged by laboratory technicians) were more likely to be bonded (P = .02); however, there was no association with bonding and excessive taper (P = .15) or axial reduction (P = .08). Crowns were more likely to be bonded if they were fabricated from leucite-reinforced glass ceramic (76.5%) or lithium disilicate (70.8%) than if they were fabricated from layered zirconia (38.8%), full-contour zirconia (30.1%), full metal (14.7%), or porcelain-fused-to-metal (13.8%) (P < .01) restorative material. There was no significant association between choice to bond and crown margin location (P = .35). Crowns in the anterior maxilla were more likely to be bonded (P < .01). CONCLUSIONS Excessive occlusal tooth preparation, anterior location of a crown, and the use of glass ceramic crowns were associated significantly with the decision to bond. PRACTICAL IMPLICATIONS In this study, the authors identified factors significantly associated with the clinical decision made by practicing dentists when selecting a cement for restoration of single-unit crowns.
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Affiliation(s)
- Nathaniel C Lawson
- Department of Clinical and Community Sciences, School of Dentistry, University of Alabama at Birmingham, 1919 7 Ave S, Birmingham, AL, 35294, 205-975-8302,
| | - Mark S Litaker
- Department of Clinical and Community Sciences, School of Dentistry, University of Alabama at Birmingham, 1919 7 Ave S, Birmingham, AL, 35294, 205-934-1179,
| | - Jack L Ferracane
- Professor and Chair, Department of Restorative Dentistry, Oregon Health & Science University, 2730 S.W. Moody Avenue, Portland, OR 97201, 503-494-4327,
| | - Valeria V Gordan
- Professor, Department of Restorative Dental Sciences, College of Dentistry, University of Florida, 1395 Center Dr, Gainesville, FL 32610, 352-273-5846,
| | - Alan M Atlas
- Private practice, Department of Endodontics and Department of Preventive/Restorative Sciences, School of Dental Medicine, University of Pennsylvania, 240 S 40th St, Philadelphia, PA 19104, 215-545-3111,
| | - Tara Rios
- Private practice, 1205 E Alton Gloor Blvd, Brownsville, TX 78526, 956-542-1956,
| | - Gregg H Gilbert
- Department of Clinical and Community Sciences, School of Dentistry, University of Alabama at Birmingham, 1919 7 Ave S, Birmingham, AL, 35294, 205-934-5423,
| | - Michael S McCracken
- Department of Clinical and Community Sciences, School of Dentistry, University of Alabama at Birmingham, 1919 7 Ave S, Birmingham, AL, 205-934-1947,
| | - National Dental PBRN Collaborative Group
- The National Dental PBRN Collaborative Group includes practitioner, faculty, and staff investigators who contributed to this activity. A list is available at http://nationaldentalpbrn.org/collaborative-group.php
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Mehmeti B, Kelmendi J, Iiljazi-Shahiqi D, Azizi B, Jakovljevic S, Haliti F, Anić-Milošević S. Comparison of Shear Bond Strength Orthodontic Brackets Bonded to Zirconia and Lithium Disilicate Crowns. Acta Stomatol Croat 2019; 53:17-27. [PMID: 31118529 PMCID: PMC6508926 DOI: 10.15644/asc53/1/2] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Aim of this study was to analyze Shear Bond Strength (SBS) and Adhesive Remnant Index (ARI) of ceramic and metallic orthodontic brackets bonded to zirconia or lithium-disilicate ceramics used for prosthetic restorations, conditioned with hydrofluoric acid (HFA) or phosphoric acid (PhA), as well as to determine the Porcelain Fracture Index (PFI), in order to examine the condition of the ceramic surface after debonding. Material and methods The research was conducted on 96 prepared all-ceramic samples divided into 8 groups combined from the type of ceramic material, orthodontic brackets, and surface conditioning. SBS was tested with Universal Testing Machine, and the samples were analyzed using a Scanning Electron Microscope, to determine ARI and PFI. Statistical data were processed using ANOVA, with the level of significance α = 0.05. Results Lithium-disilicate showed better bond strength in almost all groups. However, no significant difference between the groups was noticed and none of the factors had a significant influence on the mean values of SBS (p>0.05). Nevertheless, ARI significantly depended on the type of bracket (p = 0.005), and PFI significantly depended on the type of etchant (p = 0.029). Conclusion The use of HFA for surface etching of zirconia and lithium-disilicate, does not cause a significant increase in the SBS values as compared to etching with PhA and silane application. Furthermore, HFA can weaken the surface structure of the ceramic, and considering its toxicity, might not be the best suitable conditioner prior to orthodontic bonding to lithium disilicate, and in particular to zirconia, also taking into account its crystalline structure.
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Affiliation(s)
- Blerim Mehmeti
- Department of Orthodontics and Pedodontics, Medical Faculty - School of Dentistry, University of Pristina, Kosovo
| | - Jeta Kelmendi
- School of Dental Medicine - Ph.D. studies, University of Zagreb, Croatia
| | | | - Bleron Azizi
- School of Dental Medicine, University College AAB, Pristina, Kosovo
| | - Suzana Jakovljevic
- Department for Materials, Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Croatia
| | - Fehim Haliti
- Department of Orthodontics and Pedodontics, Medical Faculty - School of Dentistry, University of Pristina, Kosovo
| | - Sandra Anić-Milošević
- Department of Orthodontics, School of Dental Medicine, University of Zagreb, Croatia
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Mobilio N, Fasiol A, Mollica F, Catapano S. In Vitro Fracture Strength of Teeth Restored with Lithium Disilicate Onlays with and without Fiber Post Build-Up. Dent J (Basel) 2018; 6:dj6030035. [PMID: 30041411 PMCID: PMC6162807 DOI: 10.3390/dj6030035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2018] [Revised: 07/11/2018] [Accepted: 07/17/2018] [Indexed: 11/16/2022] Open
Abstract
To our knowledge there is no data about the mechanical performance of indirect restoration adhesively cemented on teeth without an adequate build-up to provide the correct geometrical configuration. The aim of this study was to compare the fracture strength of human teeth restored with lithium disilicate onlays, with and without fiber post build-up. METHODS Twenty human mandibular molars were horizontally sectioned and divided into two groups (n = 10). No treatment was applied in group A. Teeth in group B were endodontically treated, built-up using fiber post and composite core and prepared with a circumferential chamfer providing a 1 mm circumferential ferrule. Lithium disilicate onlays were pressed and luted on teeth using dual-curing luting composite. Teeth were tested under static load. Failures were classified as restorable or not restorable. Failure loads were analyzed with one-way analysis of variance. Failure modes were compared using Pearson's Chi-square tests. RESULTS The mean fracture loads were 1383.5 N for group A and 1286.3 N for group B. No difference was found (p = 0.6). Ninety per cent of fractures were classified as not restorable in both groups, with no difference (p = 0.8). CONCLUSIONS For teeth restored with adhesive procedures and lithium disilicate onlays, the presence of build-up with fiber post to provide retention and resistance form does not influence the fracture strength.
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Affiliation(s)
- Nicola Mobilio
- Department of Prosthodontics, Dental School, Dental Clinic, University of Ferrara, 44121 Ferrara, Italy.
- Department of Medical Biotechnologies, University of Siena, 53100 Siena, Italy.
| | - Alberto Fasiol
- Department of Prosthodontics, Dental School, Dental Clinic, University of Ferrara, 44121 Ferrara, Italy.
| | - Francesco Mollica
- Department of Engineering, University of Ferrara, 44124 Ferrara, Italy.
| | - Santo Catapano
- Department of Prosthodontics, Dental School, Dental Clinic, University of Ferrara, 44121 Ferrara, Italy.
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Mobilio N, Catapano S. The use of monolithic lithium disilicate for posterior screw-retained implant crowns. J Prosthet Dent 2017; 118:703-705. [DOI: 10.1016/j.prosdent.2016.12.023] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2016] [Revised: 12/30/2016] [Accepted: 12/30/2016] [Indexed: 11/29/2022]
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Mobilio N, Fasiol A, Catapano S. Qualitative evaluation of the adesive interface between lithium disilicate, luting composite and natural tooth. ANNALI DI STOMATOLOGIA 2016; 7:1-3. [PMID: 27486504 DOI: 10.11138/ads/2016.7.1.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Aim of this work was to qualitatively evaluate the interface between tooth, luting composite and lithium disilicate surface using a scanning electron microscope (SEM). An extracted restoration-free human molar was stored in physiological solution until it was embedded in an autopolimerysing acrylic resin. A standard preparation for overlay was completed and after preparation an anatomic overlay was waxed on the tooth and then hot pressed using lithium disilicate ceramic. After cementation the sample was dissected and the section was analysed using an Automatic Micromet (Remet s.a.s) and the section was analyzed using a scanning electron microscope (SEM). SEM evaluation of the tooth showed the three layers seamlessly; by increasing the enlargement the interface did not change.
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Affiliation(s)
- Nicola Mobilio
- Department of Prosthodontics, Dental School, Dental Clinic, University of Ferrara, Ferrara, Italy
| | - Alberto Fasiol
- Department of Prosthodontics, Dental School, Dental Clinic, University of Ferrara, Ferrara, Italy
| | - Santo Catapano
- Department of Prosthodontics, Dental School, Dental Clinic, University of Ferrara, Ferrara, Italy
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