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Chrabieh E, Hanna C, Mrad S, Rameh S, Bassil J, Zaarour J. Accuracy of computer-guided implant surgery in partially edentulous patients: a prospective observational study. Int J Implant Dent 2024; 10:36. [PMID: 39012381 PMCID: PMC11252094 DOI: 10.1186/s40729-024-00552-z] [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] [Received: 02/28/2024] [Accepted: 06/09/2024] [Indexed: 07/17/2024] Open
Abstract
PURPOSE This study aims to evaluate the amount of distortion using computer-guided implant surgery with 3D printed surgical guides in limited edentulous spaces. MATERIALS AND METHODS 25 bone level self-tapping implants (Straumann® BL and BLT) were randomly inserted in either distal or intercalary posterior mandibular edentulism using a fully digital protocol and 3D printed surgical guides. Amount of inaccuracy was evaluated after superimposing the 3 coordinates of virtually planned and final implant images, which were obtained using intra-oral scans and scan bodies. Four evaluation parameters were considered: origo-displacement, error depth, apical displacement and angle between the planned and the placed implant. RESULTS The average of distortion was 0.71 mm for the origo-displacement, 0.36 mm for the error depth, 0.52 mm for the horizontal displacement and 3.34º for the error angle. CONCLUSION The major reason of exclusion was CBCT artifacts. Results of this study were aligned with the results of previous studies concerning partially edentulous spaces. CAD/CAM manufacturing process did not result in significant distortion whilst the biggest part of distortions originated from the surgical process. The learning curve in computer-guided implant surgery presented an important source of inaccuracy.
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Affiliation(s)
- Emile Chrabieh
- Department of Oral Surgery, Saint Joseph University of Beirut, Beirut, Lebanon.
- Faculty of dental medicine, Campus of Medical Sciences, Saint Joseph University of Beirut, Damascus Road, Beirut, 1104 2020, Lebanon.
| | - Christine Hanna
- Department of Prosthetic and Restorative Dentistry, Saint Joseph University of Beirut, Beirut, Lebanon
| | - Stephanie Mrad
- Department of Oral Surgery, Saint Joseph University of Beirut, Beirut, Lebanon
| | - Stephanie Rameh
- Division of Prosthodontics, Department of Restorative Sciences, School of Dentistry, University of Minnesota, Minneapolis, USA
| | - Joseph Bassil
- Department of Oral Surgery, Saint Joseph University of Beirut, Beirut, Lebanon
| | - Joseph Zaarour
- Department of Oral Surgery, Saint Joseph University of Beirut, Beirut, Lebanon
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Verma M, Pathak AK, Verma UP, Patil RK, Yadav L, Tiwari AK. Comparison of bone loss around submerged and non-submerged implants during osseointegration phase. Natl J Maxillofac Surg 2024; 15:252-261. [PMID: 39234133 PMCID: PMC11371283 DOI: 10.4103/njms.njms_116_22] [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: 07/02/2022] [Revised: 08/25/2022] [Accepted: 12/14/2022] [Indexed: 09/06/2024] Open
Abstract
Background In Modern dentistry, the implant is the most popular and desirable management of tooth loss. Traditionally two stage (submerged) or one-stage (non-submerged) system has been added by many investigators. In the present study we evaluated the crestal bone loss during osseointegration phase among the three groups (i.e. submerged implants, non-submerged implants with anatomical healing abutment and non- submerged implants with esthetic healing abutment). Material and Methods 10 subjects with 30 implants, were enrolled in the study. Subjects were randomized in three groups i.e., group 1 submerged (n=10), group 2 non-submerged with anatomical healing abutment (n=10), group 3 non submerged with esthetic healing abutments (n=10). Intraoral periapical radiograph (IOPA), IMAGE J software and CBCT were used to evaluate the crestal bone loss around each implant at baseline, 1 and 3 months after implant placement. Results Crestal bone loss at the end of the 3months (osseointegration phase) was lowest in the submerged group (0.18+-0.06mm) followed by non-submerged esthetic group (0.21+-0.03mm) but it was statistically insignificant. Maximum amount of bone loss was observed in non-submerged anatomical abutment group (0.34+-0.03mm) which was highly significant. Conclusion It can be concluded that submerged implants technique is a better option in comparison to non-submerged implant technique in terms of radiographical performance during initial phases of osseointegration.
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Affiliation(s)
- Manisha Verma
- Department of Periodontology, Faculty of Dental Sciences, King George’s Medical University, Lucknow, Uttar Pradesh, India
| | - Anjani K. Pathak
- Department of Periodontology, Faculty of Dental Sciences, King George’s Medical University, Lucknow, Uttar Pradesh, India
| | - Umesh P. Verma
- Department of Periodontology, Faculty of Dental Sciences, King George’s Medical University, Lucknow, Uttar Pradesh, India
| | - Ranjit K. Patil
- Department of Oral Medicine and Radiology, Faculty of Dental Sciences, King George’s Medical University, Lucknow, Uttar Pradesh, India
| | - Lakshya Yadav
- Department of Prosthodontics Crown and Bridge, Faculty of Dental Sciences, King George’s Medical University, Lucknow, Uttar Pradesh, India
| | - Arunesh K. Tiwari
- Department of Oral and Maxillofacial Surgery, Faculty of Dental Sciences, King George’s Medical University, Lucknow, Uttar Pradesh, India
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Tokuc B, Çakır M, Yalçın Ülker GM, Geçkili O, Meral DG, Kan B. Effect of Residual Bone Height and Implant Macro-Design on Primary Stability in Sinus Floor Elevation: An Ex Vivo Study. J ORAL IMPLANTOL 2023; 49:578-583. [PMID: 38258572 DOI: 10.1563/aaid-joi-d-22-00197] [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: 01/24/2024]
Abstract
The objective was to evaluate the influence of residual bone height (RBH) and implant macro-design on the primary stability (PS) of implants using a simultaneous sinus floor elevation (SFE) and implant insertion model. Fresh bovine rib samples that resembled type-IV density that were confirmed by computerized tomography were prepared to represent 4 groups of varying RBHs (3, 6, 9, 15 mm). To simulate simultaneous implant insertion with SFE, 120 implants in different macro-designs (group R: NobelReplace; group P: NobelParallel; group A: NobelActive, Nobel Biocare, Gothenburg, Sweden) were randomly inserted at RBHs of 3, 6, 9, and 15 mm in each rib. The implant stability quotient (ISQ) was measured immediately after implant insertion. RBH and implant macro-design have an impact on ISQ values (P < .001). ISQ values were the highest with RBH of 15 mm, followed by RBHs of 9, 6, and 3 mm. (P < .001). There was no statistically significant difference between different implant macro-designs at RBHs of 3 and 15 mm regarding ISQ values (P = .111, P = .551). ISQ values of group P were higher than those of group R and group A at an RBH of 6 mm (P = .049, P = .029). ISQ values were also higher in group P compared to group A at an RBH of 9 mm (P = .006). A higher PS may be expected in sites with higher RBH, regardless of the macro-design. In addition, cylindric implant design may enhance the PS at RBHs of 6 and 9 mm in simultaneous implant insertion with SFE.
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Affiliation(s)
- Berkay Tokuc
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Kocaeli University, Turkey
| | - Merve Çakır
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Okan University, Turkey
| | - Gül Merve Yalçın Ülker
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Okan University, Turkey
| | - Onur Geçkili
- Department of Prosthodontics, Faculty of Dentistry, İstanbul University, Turkey
| | - Deniz Gökçe Meral
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Okan University, Turkey
| | - Bahadır Kan
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Okan University, Turkey
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Zhao J, Liu S, Zhang Z, Gong K, Zhao J. Understanding the thrust force evolution and primary stability for dental implantation – An in-vitro experimental investigation. Proc Inst Mech Eng H 2022; 236:1732-1743. [DOI: 10.1177/09544119221131880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The dental implant is challenging due to the unstable quality of the surrounding bone. This study aimed to explore the feasibility of using thrust force characteristics to identify different bone types and the influencing mechanisms of spindle speed and feed rate on primary stability of dental implants through in-vitro experiments. 13 groups of osteotomy experiments were performed on mandibles and maxillae of pigs with different bone types (I, II, and III) under different spindle speeds (600 and 800 rpm) and feed rates (20 and 60 mm/min). The thrust force evolution under different conditions was extracted and analysed to elaborate the distribution and thickness of the cortical and trabecular bone layers on different bone types. Dental implant placements were performed, and corresponding primary stabilities were obtained. Furthermore, histologic observation was conducted to reveal the bone/implant contact morphology. From the results, the amplitude and trend of thrust force show a regular variation during drilling different bone types. The highly dynamic information of thrust force can be analysed to characterise the distribution and thickness of the cortical and trabecular bone layers, hence effectively detecting different bone types. Since a lower feed rate and resulting bone temperature elevation lead to more thermal damages, primary stability decreases with the decrease of feed rate. Spindle speed has no significant effect. This study establishes a more in-depth understanding into the thrust force evolution and also provide a clinical option for reducing the complexity of bone type and drilling parameters determination in osteotomy.
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Affiliation(s)
- Jing Zhao
- Department of Stomatology, Beijing Tongren Hospital Affiliated to Capital Medical University, Beijing, China
| | - Sinan Liu
- School of Control and Mechanical Engineering, Tianjin Chengjian University, Tianjin, China
| | - Zhijun Zhang
- School of Control and Mechanical Engineering, Tianjin Chengjian University, Tianjin, China
| | - Kun Gong
- School of Control and Mechanical Engineering, Tianjin Chengjian University, Tianjin, China
| | - Jian Zhao
- School of Control and Mechanical Engineering, Tianjin Chengjian University, Tianjin, China
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Gershov S, Xie J, Shah FA, Shemtov-Yona K, Rittel D. Modelling the resonant frequency associated with the spatio-temporal evolution of the bone-dental implant interface. Acta Biomater 2022; 154:302-311. [PMID: 36306984 DOI: 10.1016/j.actbio.2022.10.042] [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: 08/18/2022] [Revised: 09/21/2022] [Accepted: 10/19/2022] [Indexed: 01/24/2023]
Abstract
Dental implant stability is greatly affected by the mechanical properties of the bone-implant interface (BII), and it is key to long-term successful osseointegration. Implant stability is often evaluated using the Resonant Frequency Analysis (RFA) method, and also by the quality of this interface, namely the bone-implant contact (BIC). True to this day, there is a scarcity of models tying BIC, RFA and a spatially and mechanically evolving BII. In this paper, based on the contact/distance osteogenesis concept, a novel numerical spatio-temporal model of the implant, surrounding bone and evolving interface, was developed to assess the evolution of the interfacial stresses on the one hand and the corresponding resonant frequencies on the other. We postulate that, since the BIC percentage reaches saturation over a very short time, long before densification of the interface, it becomes irrelevant as to load transmission between the implant and the bone due to the existence of an open gap. Gap closure is the factor that provides continuity between the implant and the surrounding bone. The results of the calculated RFA evolution match and provide an explanation for the multiple clinical observations of a sharp initial decline in RFA, followed by a gradual increase and plateau formation. STATEMENT OF SIGNIFICANCE: A novel three-dimensional numerical model of an evolving bone-dental implant interface (BII) is presented. The spatio-temporal evolution of the bone-implant contact (BIC) and the BII, based on contact/distance (CO/DO) osteogenesis, is modeled. A central outcome is that, until BII maturation into a solid continuous bone (no open gap between CO-DO fronts), the bone-implant load transfer is hampered, irrespective of the BIC. The resonant frequencies' evolution of the jawbone-BII-implant is calculated to reproduce the well-established implant stability analysis based on the Resonant Frequency Analysis. The results resemble those reported clinically, and here too, the determinant transition occurs only after interfacial gap closure. Those results should motivate clinicians to re-consider structural continuity of the BII rather than the BIC only.
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Affiliation(s)
- Sapir Gershov
- Technion Autonomous Systems Program, Technion - Israel Institute of Technology, Haifa 32000, Israel.
| | - Jing Xie
- State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
| | - Furqan A Shah
- Department of Biomaterials, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden
| | - Keren Shemtov-Yona
- Faculty of Mechanical Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel; The Maurice and Gabriela Goldschleger School of Dental Medicine, Department of Oral Biology, Tel Aviv University, Tel Aviv 39040, Israel
| | - Daniel Rittel
- Faculty of Mechanical Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel
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Primary Stability of Conventionally Tapered Versus Reverse Tapered Body Shift Implants Under Varying Bone Support Conditions—An In-Vitro Study. J Med Biol Eng 2022. [DOI: 10.1007/s40846-022-00736-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Influence of moisture content of frozen and embalmed human cadavers for identification of dentinal microcracks using micro-computed tomography. J Mech Behav Biomed Mater 2022; 133:105310. [PMID: 35696968 DOI: 10.1016/j.jmbbm.2022.105310] [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: 04/24/2022] [Revised: 05/31/2022] [Accepted: 06/02/2022] [Indexed: 10/18/2022]
Abstract
The aim of this study was to investigate the influence of moisture content in frozen and embalmed human cadavers on the detection of dentinal microcracks using micro-computed tomography (micro-CT). The group of embalmed specimens included three mandibular and two maxillary segments each containing one tooth. The group of frozen cadavers consisted of two frozen mandibular bone-blocks with two teeth and one mandibular segment containing one tooth. The final number of teeth for each preservation method was n = 5. All specimens were scanned with eight different moisture conditions: 48 h wet, 2 h dry, 48 h wet, 24 h dry, 48 h wet, 1 wk dry, 48 h wet, 1 wk dry. Micro-CT images were screened for the presence of dentinal microcracks. Statistical analysis was performed by nonparametric analysis of variance (α = 5%). Only few microcracks were observed in wet and in 2 h dried bone-blocks with no significant differences (p = 0.63 and p = 0.23, respectively). There was a significant and steady increase of microcracks within the groups of dried specimens as follows: 2 h dry < 24 h dry < first wk dry < second wk dry (all p < 0.008). Preservation method had no significant influence on the visibility of microcracks (p = 0.98). Identification of dentinal microcracks on micro-CT images is influenced by moisture content of cadaveric bone-blocks irrespective of the preservation method.
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Comparison of Stress Distribution in Surrounding Bone during Insertion of Dental Implants on Four Implant Threads under the Effect of an Impact: A Finite Element Study. JOURNAL OF BIOMIMETICS BIOMATERIALS AND BIOMEDICAL ENGINEERING 2022. [DOI: 10.4028/www.scientific.net/jbbbe.54.89] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The design of an implant thread plays a fundamental role in the osseointegration process, particularly in low-density bone. It has been postulated that design features that maximize the surface area available for contact may improve mechanical anchorage and stability in cancellous bone. The primary stability of a dental implant is determined by the mechanical engagement between the implant and bone at the time of implant insertion. The contact area of implant-bone interfaces and the concentrated stresses on the marginal bones are principal concerns of implant designers. Numerous factors influence load transfer at the bone-implant interface, for example, the type of loading, surface structure, amount of surrounding bone, material properties of the implant and implant design. The purpose of this study was to investigate the effects of the impact two different projectile of implant threads on stress distribution in the jawbone using three-dimensional finite element analysis.
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Kim YY, Song YW, Kim MJ, Cha JK, Park JM, Kim JH, Jung UW. Immediate loading of fixed partial prostheses reconstructed using either tapered or straight implants in the posterior area: A randomized clinical trial. Clin Implant Dent Relat Res 2021; 23:703-715. [PMID: 34378853 DOI: 10.1111/cid.13039] [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: 04/12/2021] [Revised: 07/23/2021] [Accepted: 07/29/2021] [Indexed: 01/06/2023]
Abstract
BACKGROUND In immediately loaded implants within 72 h after the implant placement in the unilaterally and partially edentulous ridge, primary stability is considered critical, which can be influenced by the design of the implant fixture. PURPOSE To determine the outcomes at 1 year after the immediate loading of multiunit fixed partial prostheses over either tapered implants (TIs) or straight implants (SIs) in the posterior region. MATERIALS AND METHODS Forty-eight patients (24 patients, 52 implants in TI group; 24 patients, 50 implants in SI group) were included for the study. Except for the one SI group patient whose two implants showed the insertion torque less than 30 Ncm, provisional prostheses designed and fabricated from intraoral scan data obtained immediately after implant surgery were delivered to rest of the 47 subjects at 3-7 days. After a year, the survival rate was estimated by intention-to-treat (ITT) and per-protocol (PP) analyses, and marginal bone loss (MBL) and implant stability were also analyzed statistically (p < 0.05). RESULTS Survival rate at implant level in TI group was 96.2%, and that of SI group in the ITT analysis was 86.0%. Intergroup difference, however, was not statistically significant (p > 0.05). Insertion torque was significantly higher in TI group than SI group (47.12 ± 6.37 Ncm vs. 41.60 ± 9.77 Ncm; p < 0.05). MBLs of both groups were less than 0.1 mm at 1-year follow-up and was similar between two groups (p > 0.05). CONCLUSIONS Immediate loading of fixed partial prostheses after TI and SI placement showed reliable outcomes in the partially edentulous posterior ridge. In terms of the initial mechanical stability, the performance was superior for TIs than for SIs.
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Affiliation(s)
- Yoo-Yeon Kim
- Department of Periodontology, Research Institute for Periodontal Regeneration, Yonsei University College of Dentistry, Seoul, South Korea
| | - Young Woo Song
- Department of Periodontology, Research Institute for Periodontal Regeneration, Yonsei University College of Dentistry, Seoul, South Korea.,Department of Oral Medicine, Infection, and Immunity, Harvard School of Dental Medicine, Boston, Massachusetts, USA
| | - Myong Ji Kim
- Department of Periodontology, Research Institute for Periodontal Regeneration, Yonsei University College of Dentistry, Seoul, South Korea
| | - Jae-Kook Cha
- Department of Periodontology, Research Institute for Periodontal Regeneration, Yonsei University College of Dentistry, Seoul, South Korea
| | - Ji-Man Park
- Department of Prosthodontics, Yonsei University College of Dentistry, Seoul, South Korea
| | - Jee-Hwan Kim
- Department of Prosthodontics, Yonsei University College of Dentistry, Seoul, South Korea
| | - Ui-Won Jung
- Department of Periodontology, Research Institute for Periodontal Regeneration, Yonsei University College of Dentistry, Seoul, South Korea
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Can the Bone Density Estimated by CBCT Predict the Primary Stability of Dental Implants? A New Measurement Protocol. J Craniofac Surg 2021; 32:e171-e174. [PMID: 33705063 DOI: 10.1097/scs.0000000000006991] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
BACKGROUND The use of dental implants to restore edentulous parts of the jaws is a common and well-documented treatment method. Effective dental implant treatment is known to be affected by both the quality and the quantity of bone required for implant placement, bone quality is a critical factor to consider when predicting stability of implants. Thus, stability of the initial implant and the possibility of early loading could be predicated using cone-beam computed tomography (CBCT) scans and primary stability parameters before implant placement. OBJECTIVES The aim of this study was to objectively assess bone density obtained by CBCT and the correlations with primary stability of dental implants using implant stability meter IST device. METHODS A total of 40 implants were placed in 16 patients (9 males and 7 females with a range of 22 to 61 years (mean age 40.44 ± 12.3 years). The bone densities of implant recipient sites were preoperatively recorded using CBCT. The maximum insertion torque value of each implant was measured by engine during implant placement and compared to the primary stability for every implant using implant stability meter device (IST). RESULTS A statistically significant correlation was found between bone density value from CBCT with the primary implant stability and insertion torque. CONCLUSION Although the small samples size, the study shown bone density assessment using CBCT is an efficient method and significantly correlated with primary stability using implant stability meter device IST and insertion torque.
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Liu W, Cai H, Zhang J, Wang J, Sui L. Effects of immediate and delayed loading protocols on marginal bone loss around implants in unsplinted mandibular implant-retained overdentures: a systematic review and meta-analysis. BMC Oral Health 2021; 21:122. [PMID: 33731092 PMCID: PMC7968211 DOI: 10.1186/s12903-021-01486-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2020] [Accepted: 03/04/2021] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Immediate loading has recently been introduced into unsplinted mandibular implant-retained overdentures for the management of edentulous patients due to their increasing demand on immediate aesthetics and function. However, there is still a scarcity of meta-analytical evidence on the efficacy of immediate loading compared to delayed loading in unsplinted mandibular implant-retained overdentures. The purpose of this study was to compare the marginal bone loss (MBL) around implants between immediate and delayed loading of unsplinted mandibular implant-retained overdentures. METHODS Randomized controlled trials (RCTs), controlled clinical trials (CCTs), and cohort studies quantitatively comparing the MBL around implants between immediate loading protocol (ILP) and delayed loading protocol (DLP) of unsplinted mandibular overdentures were included. A systematic search was carried out in PubMed, EMBASE, and CENTRAL databases on December 02, 2020. "Grey" literature was also searched. A meta-analysis was conducted to compare the pooled MBL of two different loading protocols of unsplinted mandibular overdentures through weighted mean differences (WMDs) with 95% confidence intervals (95% CIs). The subgroup analysis was performed between different attachment types (i.e. Locator attachment vs. ball anchor). The risk of bias within and across studies were assessed using the Cochrane Collaboration's tool, the Newcastle-Ottawa scale, and Egger's test. RESULTS Of 328 records, five RCTs and two cohort studies were included and evaluated, which totally contained 191 participants with 400 implants. The MBL of ILP group showed no significant difference with that of DLP group (WMD 0.04, CI - 0.13 to 0.21, P > .05). The subgroup analysis revealed similar results with Locator attachments or ball anchors (P > .05). Apart from one RCT (20%) with a high risk of bias, four RCTs (80%) showed a moderate risk of bias. Two prospective cohort studies were proved with acceptable quality. Seven included studies have reported 5.03% implant failure rate (10 of 199 implants) in ILP group and 1.00% failure rate (2 of 201 implants) in DLP group in total. CONCLUSIONS For unsplinted mandibular implant-retained overdentures, the MBL around implants after ILP seems comparable to that of implants after DLP. Immediate loading may be a promising alternative to delayed loading for the management of unsplinted mandibular implant-retained overdentures. PROSPERO registration number: CRD42020159124.
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Affiliation(s)
- Wei Liu
- Department of Prosthodontics, School & Hospital of Stomatology, Tianjin Medical University, Tianjin, 300070, China
| | - He Cai
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China School of Stomatology, Sichuan University, No. 14, Section 3, South Renmin Road, Chengdu, 610041, China
| | - Junjiang Zhang
- Department of Prosthodontics, School & Hospital of Stomatology, Tianjin Medical University, Tianjin, 300070, China
| | - Jian Wang
- Department of Prosthodontics, West China Hospital of Stomatology, Sichuan University, No. 14, Section 3, South Renmin Road, Chengdu, 610041, China
| | - Lei Sui
- Department of Prosthodontics, School & Hospital of Stomatology, Tianjin Medical University, Tianjin, 300070, China.
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Valente MLC, Bolfarini C, de Oliveira DP, Dos Reis AC. Dental mini-implant designs to support overdentures: Development, biomechanical evaluation, and 3D digital image correlation. J Prosthet Dent 2021; 128:754-763. [PMID: 33640085 DOI: 10.1016/j.prosdent.2020.06.043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 06/26/2020] [Accepted: 06/29/2020] [Indexed: 11/17/2022]
Abstract
STATEMENT OF PROBLEM Custom mini-implants are needed for edentulous patients with extensive mandibular deficiencies where endosteal placement is not possible. However, the best design for these mini-implants is unclear. PURPOSE The purpose of this in vitro study was to develop 2 dental mini-implant designs to support mandibular overdentures and evaluate the effect of their geometries on primary stability and stress distribution. MATERIAL AND METHODS Two mini-implant designs were developed with changes in the shape, size, and arrangement of threads and chamfers. The experimental mini-implants were made of Grade V titanium alloy (Ti-6Al-4V), (Ø2.0×10 mm) and submitted to a nanoscale surface treatment. Thirty mini-implants (n=10) were placed into fresh swine bones: experimental-threaded, experimental-helical, and a commercially available product model (Intra-Lock System) as the control. The biomechanical evaluations of the experimental mini-implants were compared with those of the control in terms of primary stability, through insertion torque (IT), and with the pullout test. The analysis of stress distribution was performed by using the method of 3D digital image correlation under 250-N axial load and 100-N oblique (30-degree angled model) load. The data were analyzed by ANOVA and the Tukey HSD test (α=.05). RESULTS The IT and pullout test presented a statistically significant difference for all mini-implants (P<.05), with higher IT for the experimental-threaded and maximum pullout force for the control, followed by threaded (P=.001) and helical (P=.001). Regarding the 3D digital image correlation, a lower incidence of stress was found in the cervical third for all mini-implants. No statistically significant differences were found between the designs evaluated (P>.05). CONCLUSIONS Comparing the experimental mini-implants with the commercially available control, the experimental-threaded model presented greater primary stability, and all mini-implants showed less stress in the cervical third.
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Affiliation(s)
- Mariana L C Valente
- Posdoctoral student, Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School, University of São Paulo, (USP), Ribeirão Preto, São Paulo, Brazil
| | - Claudemiro Bolfarini
- Full Professor, Department of Materials Engineering, Federal University of São Carlos, (UFScar), São Carlos, São Paulo, Brazil
| | - Diego P de Oliveira
- Post-doctor, Department of Materials Engineering, Federal University of São Carlos, (UFScar), São Carlos, São Paulo, Brazil
| | - Andréa C Dos Reis
- Associate Professor, Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School, University of São Paulo, (USP), Ribeirão Preto, São Paulo, Brazil.
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Staedt H, Kämmerer PW, Goetze E, Thiem DGE, Al-Nawas B, Heimes D. Implant primary stability depending on protocol and insertion mode - an ex vivo study. Int J Implant Dent 2020; 6:49. [PMID: 32880030 PMCID: PMC7468011 DOI: 10.1186/s40729-020-00245-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Accepted: 07/15/2020] [Indexed: 12/11/2022] Open
Abstract
Background Dental implant primary stability is thought to be a fundamental prerequisite for the long-term survival and success. The aim of this study was to analyze the influence of protocol and insertion mode on dental implant stability ex vivo. One hundred and twenty implants were inserted either manually or machine-driven into porcine mandibles by a standard or over-dimensioned protocol. Dental implant stability was measured via resonance frequency analysis (RFA), insertion torque (IT), and torque out (TO). Results Statistically significant higher IT and TO values were seen after standard protocol insertion (p < 0.05), whereas manual and machine-driven insertion mode showed equivalent values. Conclusions The over-dimensioned protocol exceeded the primary stability values recommended for immediate implant insertion; therefore, it could be recommended as well.
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Affiliation(s)
- Henning Staedt
- Private Practice and Department of Prosthodontics and Materials Science, University Medical Center Rostock, Strempelstraße 13, 18057, Rostock, Germany
| | - Peer W Kämmerer
- Department of Oral- and Maxillofacial Surgery, University Medical Center Mainz, Augustusplatz 2, 55131, Mainz, Germany
| | - Elisabeth Goetze
- Department of Oral- and Maxillofacial Surgery, University Medical Center Mainz, Augustusplatz 2, 55131, Mainz, Germany
| | - Daniel G E Thiem
- Department of Oral- and Maxillofacial Surgery, University Medical Center Mainz, Augustusplatz 2, 55131, Mainz, Germany
| | - Bilal Al-Nawas
- Department of Oral- and Maxillofacial Surgery, University Medical Center Mainz, Augustusplatz 2, 55131, Mainz, Germany
| | - Diana Heimes
- Department of Oral- and Maxillofacial Surgery, University Medical Center Mainz, Augustusplatz 2, 55131, Mainz, Germany.
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H H, G W, E H. The clinical significance of implant stability quotient (ISQ) measurements: A literature review. J Oral Biol Craniofac Res 2020; 10:629-638. [PMID: 32983857 DOI: 10.1016/j.jobcr.2020.07.004] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 06/22/2020] [Accepted: 07/13/2020] [Indexed: 10/23/2022] Open
Abstract
Implant stability quotients (ISQ values) are obtained in dental clinical practice on a non-invasive basis by resonance frequency measurement rapidly after surgical placement of implants. The ISQ-values are used as indicator for mechanical implant stability, and are believed to have predictive power for clinical outcome. It is the aim of this review to provide a synopsis of all factors described in the literature that influence ISQ measurements by performing an exhaustive literature review; moreover, this review aims at elucidating the key factors relevant for a rapid clinical predictive assessment. We searched systematically and exhaustively all major databases for publications relating to ISQ measurement methodology and for ISQ-influencing factor analyses. The reports identified were ordered in experimental (preclinical) studies and in clinical publications. We were able to identify 13 basic factors influencing ISQ-measurements. Among these, local bone quality, playing a key role in such measurements, was subdivided in four specific subfactors; thus a total of 17 individual factors was identified and reported to influence ISQ-measurements. A comprehensive list of these factors is provided in Table-form. A critical analysis points out that only 6 of these factors are of a sound predictive power useful for a rapid clinical assessment; and only two of these factors appear to have a well-documented scientific basis.
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Affiliation(s)
- Huang H
- Department of Oral Implantology and Prosthetic Dentistry, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije University Amsterdam, Gustav Mahlerlaan, 3004, 1081LA Amsterdam, Nord-Holland, the Netherlands.,Department of Osteoporosis, Inselspital Bern University Hospital, Freiburgstrasse 3, CH-3010, Bern, Switzerland
| | - Wu G
- Department of Oral Implantology and Prosthetic Dentistry, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije University Amsterdam, Gustav Mahlerlaan, 3004, 1081LA Amsterdam, Nord-Holland, the Netherlands
| | - Hunziker E
- Department of Osteoporosis, Inselspital Bern University Hospital, Freiburgstrasse 3, CH-3010, Bern, Switzerland.,Departments of Osteoporosis and Orthopaedic Surgery, Inselspital Bern University Hospital, Freiburgstrasse 3, CH-3010, Bern, Switzerland
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15
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Ellis R, Chen S, Davies H, Fitzgerald W, Xu J, Darby I. Primary stability and healing outcomes of apically tapered and straight implants placed into fresh extraction sockets. A pre-clinical in vivo study. Clin Oral Implants Res 2020; 31:705-714. [PMID: 32455469 DOI: 10.1111/clr.13618] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Revised: 04/21/2020] [Accepted: 04/25/2020] [Indexed: 11/28/2022]
Abstract
OBJECTIVES To compare the stability of apically tapered and straight (non-tapered cylindrical) implants at the time of immediate placement and to histologically evaluate the healing outcomes after 6 weeks. MATERIALS AND METHODS The second maxillary incisors were extracted bilaterally in nine dogs. After randomization, apically tapered and straight implants with a 3.3 mm shoulder diameter were inserted into the extraction sockets. The implant stability quotient (ISQ) of the implants was recorded after placement. Peri-implant defects on the buccal aspect were filled with deproteinized bovine bone mineral and covered with resorbable type I/III porcine collagen matrix. After 6 weeks of healing, sections were prepared for histological and morphometric analysis. RESULTS All implant sites healed uneventfully. The apically tapered implants had significantly higher ISQ values compared to straight implants at placement (p = .009). The histomorphometric outcomes 6 weeks following implant placement in both experimental groups were similar, except in the apico-palatal region. Apically tapered implants demonstrated significantly less percentage bone-to-implant contact (p = .035) in the apico-palatal region. At both implant types, substantial corono-apical resorption of the buccal bone wall was noted in the coronal 2 mm of the implant. CONCLUSION Apically tapered implants had significantly higher ISQ values at immediate placement compared to straight implants. The healing outcomes and remodelling of the buccal bone wall were similar for both implant designs. In the apico-palatal region, there was less %BIC at the implant surface at apically tapered implants compared to straight implants.
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Affiliation(s)
- Rebecca Ellis
- Periodontics, Melbourne Dental School, University of Melbourne, Parkville, VIC, Australia
| | - Stephen Chen
- Periodontics, Melbourne Dental School, University of Melbourne, Parkville, VIC, Australia
| | - Helen Davies
- Faculty of Veterinary Science, University of Melbourne, Parkville, VIC, Australia
| | - Wayne Fitzgerald
- Faculty of Veterinary Science, University of Melbourne, Parkville, VIC, Australia
| | - Junhua Xu
- The First Affiliated Hospital of Medicine College, Zhe Jiang University Hangzhou, Hangzhou, China
| | - Ivan Darby
- Periodontics, Melbourne Dental School, University of Melbourne, Parkville, VIC, Australia
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16
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Zhou Y, Gong C, Hossaini-Zadeh M, Du J. 3D full-field strain in bone-implant and bone-tooth constructs and their morphological influential factors. J Mech Behav Biomed Mater 2020; 110:103858. [PMID: 32501222 DOI: 10.1016/j.jmbbm.2020.103858] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Revised: 05/08/2020] [Accepted: 05/10/2020] [Indexed: 01/20/2023]
Abstract
The biomechanics of bone-tooth and bone-implant interfaces affects the outcomes of several dental treatments, such as implant placement, because bone, tooth and periodontal ligament are living tissues that adapt to the changes in mechanical stimulations. In this work, mechanical testing coupled with micro-CT was performed on human cadaveric mandibular bone-tooth and bone-implant constructs. Using digital volume correlation, the 3D full-field strain in bone under implant loading and tooth loading was measured. Concurrently, bone morphology and bone-implant and bone-tooth contact were also measured through the analysis of micro-CT images. The results show that strain in bone increased when a tooth was replaced by a dental implant. Strain concentration was observed in peri-implant bone, as well as in the buccal bone plate, which is also the clinically-observed bone resorption area after implant placement. Decreasing implant stability measurements (resonance frequency analysis and torque test) indicated increased peri-implant strain, but their relationships may not be linear. Peri-implant bone strain linearly increased with decreasing bone-implant contact (BIC) ratio. It also linearly decreased with increasing bone-tooth/bone-implant contact ratio. The high strain in the buccal bone plate linearly increased with decreasing buccal bone plate thickness. The results of this study revealed 3D full-field strain in bone-tooth and bone-implant constructs, as well as their several morphological influential factors.
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Affiliation(s)
- Yuxiao Zhou
- Department of Mechanical Engineering, Pennsylvania State University, University Park, PA, 16802, United States.
| | - Chujie Gong
- Department of Biomedical Engineering, Pennsylvania State University, University Park, PA, 16802, United States.
| | - Mehran Hossaini-Zadeh
- Department of Oral Maxillofacial Pathology, Medicine and Surgery, Temple University, Philadelphia, PA, 19140, United States.
| | - Jing Du
- Department of Mechanical Engineering, Pennsylvania State University, University Park, PA, 16802, United States.
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17
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Christiaens V, Pitman J, Glibert M, Hommez G, Atashkadeh M, De Bruyn H. Rationale for a reverse tapered body shift implant for immediate placement. Int J Oral Maxillofac Surg 2020; 49:1630-1636. [PMID: 32371178 DOI: 10.1016/j.ijom.2020.04.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Revised: 02/18/2020] [Accepted: 04/09/2020] [Indexed: 11/24/2022]
Abstract
Immediate implant placement holds considerable value, yet primary implant stability is often a critical factor. The aim of this study was to evaluate the stability, volumetric viability, and buccal gap size of reverse tapered body shift (RTBS) implants after immediate placement. Peak insertion torque measurements of two RTBS designs (apical 40% vs. apical 50%), relative to conventionally tapered implants, were assessed in simulated extraction sockets prepared in synthetic bone blocks. Additionally, the proximity of the RTBS implants to neighbouring teeth and anatomical structures, and the buccal gap distance were evaluated in human cadavers. The mean (± standard deviation) insertion torque was 12.00±1.40N•cm for the conventionally tapered implants (n=50), 35.36±2.74N•cm (n=50) for RTBS-1, and 48.20±2.90N•cm (n=50) for RTBS-2; the difference between designs was statistically significant (P<0.01). In total, 40 RTBS implants (20 per design) were placed in six cadaveric premaxillae. Only one locus was inappropriate for both RTBS implant designs, due to the proximity of neighbouring teeth. The average buccal gap for both implant designs was 2.8mm (P=0.104). The improved primary stability and increased buccal gap size with RTBS implants may enhance the feasibility of immediate placement. The study findings should be further validated in clinical trials.
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Affiliation(s)
- V Christiaens
- Faculty of Medicine and Health Sciences, Dental School, Department of Periodontology and Oral Implantology, Ghent University, Ghent, Belgium.
| | - J Pitman
- Southern Implants (Pty), Ltd, Irene, Gauteng, South Africa
| | - M Glibert
- Faculty of Medicine and Health Sciences, Dental School, Department of Periodontology and Oral Implantology, Ghent University, Ghent, Belgium
| | - G Hommez
- Faculty of Medicine and Health Sciences, Dental School, Department of Periodontology and Oral Implantology, Ghent University, Ghent, Belgium
| | - M Atashkadeh
- Periodontology and Oral Implantology, All Saints Green Dental Practice, Norwich, UK
| | - H De Bruyn
- Faculty of Medicine and Health Sciences, Dental School, Department of Periodontology and Oral Implantology, Ghent University, Ghent, Belgium; Radboud University Medical Centre, Radboud Institute - Health Sciences, Department of Dentistry, Implantology and Periodontology, Nijmegen, The Netherlands
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18
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de Carvalho Silva Leocádio A, Silva Júnior M, José Pimentel Lopes de Oliveira G, da Col Santos Pinto G, Silveira Faeda R, Marques Padovan LE, Marcantonio Júnior É. Evaluation of Implants with Different Macrostructures in Type I Bone-Pre-Clinical Study in Rabbits. MATERIALS 2020; 13:ma13071521. [PMID: 32224982 PMCID: PMC7178163 DOI: 10.3390/ma13071521] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/23/2020] [Revised: 03/13/2020] [Accepted: 03/22/2020] [Indexed: 12/13/2022]
Abstract
The objective of this study was to assess the primary stability and the osseointegration process in implants with different macrostructures (Cylindrical vs. Hybrid Conical) in rabbit tibiae. Twenty-four (24) rabbits were used, divided into 3 experimental periods (2, 4 and 8 weeks) with 8 animals each. Each animal bilaterally received 2 implants from each group in the tibial metaphysis: Cylindrical Implant (CI) and Hybrid Conical Implant (HCI). All implants were assessed for insertion torque. After the experimental periods, one of the implants in each group was submitted to the removal counter-torque test and descriptive histological analysis while the other implant was used for microtomographic and histometric analysis (%Bone-Implant Contact). HCI implants showed higher insertion torque (32.93 ± 10.61 Ncm vs. 27.99 ± 7.80 Ncm) and higher % of bone-implant contact in the 8-week period (79.08 ± 11.31% vs. 59.72 ± 11.29%) than CI implants. However, CI implants showed higher values of removal counter-torque than HCI implants in the 8-week period (91.05 ± 9.32 Ncm vs. 68.62 ± 13.70 Ncm). There were no differences between groups regarding microtomographic data. It can be concluded that HCI implants showed greater insertion torque and bone-implant contact in relation to CI implants in the period of 8 weeks when installed in cortical bone of rabbits.
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Affiliation(s)
- Amanda de Carvalho Silva Leocádio
- Department of Diagnosis and Surgery, School of Dentistry at Araraquara, Sao Paulo State University (UNESP), Araraquara 14801-385, Brazil;
- Correspondence: (A.d.C.S.L.); (É.M.J.); Tel.: +55-(35)-99138-5571 (A.d.C.S.L.); +55-(16)-33016378 (É.M.J.)
| | - Matusalém Silva Júnior
- Post Graduation Course in Implantology, Latin American Institute of Dental Research (ILAPEO), Curitiba 80710-150, Brazil; (M.S.J.); (L.E.M.P.)
| | | | - Gustavo da Col Santos Pinto
- Department of Diagnosis and Surgery, School of Dentistry at Araraquara, Sao Paulo State University (UNESP), Araraquara 14801-385, Brazil;
| | - Rafael Silveira Faeda
- Post Graduation Course in Odontology, University of Araraquara/UNIARA, Araraquara 14801-320, Brazil;
| | - Luis Eduardo Marques Padovan
- Post Graduation Course in Implantology, Latin American Institute of Dental Research (ILAPEO), Curitiba 80710-150, Brazil; (M.S.J.); (L.E.M.P.)
| | - Élcio Marcantonio Júnior
- Department of Diagnosis and Surgery, School of Dentistry at Araraquara, Sao Paulo State University (UNESP), Araraquara 14801-385, Brazil;
- Correspondence: (A.d.C.S.L.); (É.M.J.); Tel.: +55-(35)-99138-5571 (A.d.C.S.L.); +55-(16)-33016378 (É.M.J.)
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19
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DeBaun MR, Swinford ST, Chen MJ, Thio T, Behn AA, Lucas JF, Bishop JA, Gardner MJ. Biomechanical comparison of bone-screw-fasteners versus traditional locked screws in plating female geriatric bone. Injury 2020; 51:193-198. [PMID: 31703961 DOI: 10.1016/j.injury.2019.10.032] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 10/07/2019] [Accepted: 10/14/2019] [Indexed: 02/02/2023]
Abstract
OBJECTIVES To biomechanically compare plated constructs using nonlocking bone-screw-fasteners with interlocking threads versus locking screws with traditional buttress threads in geriatric female bone. METHODS Eleven matched pairs of proximal and distal segments of geriatric female cadaveric tibias were used to create a diaphyseal fracture model. Nonlocking bone-screw-fasteners or locking buttress threaded screws were applied to a locking compression plate on the anterolateral aspect of the tibia placed in bridge mode. Specimens were subjected to incrementally increasing cyclic axial load combined with constant cyclic torsion. Total cycles to failure served as a primary outcome measure, with failure defined as 2 mm of displacement or 10 degrees of rotation. Secondary outcome measures included initial stiffness in compression and torsion determined from preconditioning testing and overall rigidity as determined by maximum peak-to-peak axial and rotational motion at 500 cycle intervals during cyclic testing. Group comparisons were made using paired Student's t-tests. Significance was set at p < 0.05. RESULTS Bone-screw-fastener constructs failed at an average of 40,636 ± 22,151 cycles and locking screw constructs failed at an average of 37,773 ± 8433 cycles, without difference between groups (p = =0.610). Total cycles to failure was higher in the bone-screw-fasteners group for 7 tibiae out of the eleven matched pairs tested. During static and cyclic testing, bone-screw-fastener constructs demonstrated increased initial torsional stiffness (7.6%) and less peak-to-peak displacement and rotation throughout the testing cycle(p < 0.05). CONCLUSIONS In female geriatric bone, constructs fixed with bone-screw-fasteners incorporate multiplanar interlocking thread geometry and performed similarly to traditional locked plating. These novel devices may combine the benefits of both nonlocking and locking screws when plating geriatric bone.
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Affiliation(s)
- Malcolm R DeBaun
- Department of Orthopaedics, School of Medicine, Stanford University, 450 Broadway St., MC 6342, Redwood City, CA 94063, United States
| | - Steven T Swinford
- Department of Orthopaedics, School of Medicine, Stanford University, 450 Broadway St., MC 6342, Redwood City, CA 94063, United States
| | - Michael J Chen
- Department of Orthopaedics, School of Medicine, Stanford University, 450 Broadway St., MC 6342, Redwood City, CA 94063, United States
| | - Timothy Thio
- Department of Orthopaedics, School of Medicine, Stanford University, 450 Broadway St., MC 6342, Redwood City, CA 94063, United States
| | - Anthony A Behn
- Department of Orthopaedics, School of Medicine, Stanford University, 450 Broadway St., MC 6342, Redwood City, CA 94063, United States
| | | | - Julius A Bishop
- Department of Orthopaedics, School of Medicine, Stanford University, 450 Broadway St., MC 6342, Redwood City, CA 94063, United States
| | - Michael J Gardner
- Department of Orthopaedics, School of Medicine, Stanford University, 450 Broadway St., MC 6342, Redwood City, CA 94063, United States.
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Rizzo P. A review on the latest advancements in the non-invasive evaluation/monitoring of dental and trans-femoral implants. Biomed Eng Lett 2019; 10:83-102. [PMID: 32175131 DOI: 10.1007/s13534-019-00126-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Revised: 06/05/2019] [Accepted: 07/29/2019] [Indexed: 12/11/2022] Open
Abstract
Dental implants and transcutaneous prostheses (trans-femoral implants) improve the quality of life of millions of people because they represent the optimal treatments to edentulism and amputation, respectively. The clinical procedures adopted by surgeons to insert these implants are well established. However, there is uncertainty on the outcomes of the post-operation recovery because of the uncertainty associated with the osseointegration process, which is defined as the direct, structural and functional contact between the living bone and the fixture. To guarantee the long-term survivability of dental or trans-femoral implants doctors sometimes implement non-invasive techniques to monitor and evaluate the progress of osseointegration. This may be done by measuring the stability of the fixture or by assessing the quality of the bone-fixture interface. In addition, care providers may need to quantify the structural integrity of the bone-implant system at various moments during the patients recovery. The accuracy of such non-invasive methods reduce recovery and rehabilitation time, and may increase the survival rate of the therapies with undisputable benefits for the patients. This paper provides a comprehensive review of clinically-approved and emerging non-invasive methods to evaluate/monitor the osseointegration of dental and orthopedic implants. A discussion about advantages and limitations of each method is provided based on the outcomes of the cases presented. The review on the emerging technologies covers the developments of the last decade, while the discussion about the clinically approved systems focuses mostly on the latest (2017-2018) findings. At last, the review also provides some suggestions for future researches and developments in the area of implant monitoring.
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Affiliation(s)
- Piervincenzo Rizzo
- Department of Civil and Environmental Engineering, University of Pittsburgh, 729 Benedum Hall, 3700 O'Hara Street, Pittsburgh, PA 15261 USA
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21
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Aragoneses JM, Suárez A, Brugal VA, Gómez M. Frequency Values and Their Relationship With the Diameter of Dental Implants. Prospective Study of 559 Implants. IMPLANT DENT 2019; 28:279-288. [DOI: 10.1097/id.0000000000000887] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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22
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Mikić M, Mihailović B, Dubovina D, Miladinović M, Mitić A, Vlahović Z. COMPARATIVE RESONANCE FREQUENCY ANALYSISOF THE PRIMARY STABILITY AT DIFFERENT DENTAL IMPLANT DESIGNS. ACTA MEDICA MEDIANAE 2019. [DOI: 10.5633/amm.2019.0112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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23
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A Comparative Analysis of Standardised Threads for Use in Implants for Direct Skeletal Attachment of Limb Prosthesis: A Finite Element Analysis. Appl Bionics Biomech 2019; 2019:8027064. [PMID: 30881483 PMCID: PMC6383408 DOI: 10.1155/2019/8027064] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Accepted: 11/25/2018] [Indexed: 12/02/2022] Open
Abstract
The aim of the research was to determine the optimal thread's shape to be used in implants for direct skeletal attachment of limb prosthesis. In addition, by testing appropriate parameters' modification of the suitable thread, an attempt was made to maximise its effectiveness. The analyses included three thread types described in the ISO standards: shallow, symmetrical, and asymmetrical. The obtained results suggest that shallow thread ensures the lowest equivalent and directional stress peaks generated in the bone as well as favourable stress patterns and profiles during implant loading in relation to symmetrical and asymmetrical threads. Moreover, shallow thread ensured the generation of single equivalent and directional stress peaks, while symmetrical and asymmetrical threads provided additional stress peak for equivalent as well as for each of directional peaks. Subsequently, optimisation of the shallow thread's shape was conducted by changing two relevant thread's parameters (flank angle and rounding arc) which influence the generated stress distribution. The highest reduction of stress peaks was obtained while reducing the rounding arc by 0.2 mm. Therefore, it can be stated that the proposed modification of the HA thread can lead to obtaining a higher biomechanical effectiveness of implants for direct skeletal attachment of limb prosthesis.
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Zanetti EM, Pascoletti G, Calì M, Bignardi C, Franceschini G. Clinical Assessment of Dental Implant Stability During Follow-Up: What Is Actually Measured, and Perspectives. BIOSENSORS 2018; 8:E68. [PMID: 30011870 PMCID: PMC6165397 DOI: 10.3390/bios8030068] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 07/09/2018] [Accepted: 07/11/2018] [Indexed: 01/02/2023]
Abstract
The optimization of loading protocols following dental implant insertion requires setting up patient-specific protocols, customized according to the actual implant osseointegration, measured through quantitative, objective methods. Various devices for the assessment of implant stability as an indirect measure of implant osseointegration have been developed. They are analyzed here, introducing the respective physical models, outlining major advantages and critical aspects, and reporting their clinical performance. A careful discussion of underlying hypotheses is finally reported, as is a suggestion for further development of instrumentation and signal analysis.
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Qamheya AHA, Arısan V, Mutlu Z, Karabaglı M, Soluk Tekkeşin M, Kara K, Erol A, Ersanlı S. Thermal oxidation and hydrofluoric acid treatment on the sandblasted implant surface: A histologic histomorphometric and biomechanical study. Clin Oral Implants Res 2018; 29:741-755. [PMID: 29876965 DOI: 10.1111/clr.13285] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Revised: 04/25/2018] [Accepted: 05/02/2018] [Indexed: 12/31/2022]
Abstract
OBJECTIVES This study aimed to analyze and compare the topographical, chemical, and osseointegration characteristics of a sandblasted acid-etched surface (SLA group), a sandblasted thermally oxidized surface (SO group), and a surface chemically modified by hydrofluoric (HF) acid (SOF group). MATERIALS AND METHODS Following the preparation and characterization of the relevant surfaces, 90 implants (30 for each group) were placed on the pelvic bone of six sheep. Resonance frequency analysis (RFA), insertion (ITV), removal torque value (RTV), and histomorphometric analyses (BIC%) were performed after three and 8 weeks of healing. The results were analyzed by nonparametric tests (p < 0.05). RESULTS The roughness value (Ra) in the SOF group was significantly lower than the SLA and the SO group (p = 0.136, p < 0.001, respectively). This resulted in a substantially inferior ITV 14.83 N/cm (SD: 4.04) than those achieved in the SLA and SO groups (19.50 (SD: 6.07) and 20.17 N/cm (SD: 8.95), respectively; p = 0.001). A statistically significant change in the RFA from the baseline (47.36 ISQ, SD: 6.93) to the 3rd week (62.56 ISQ, SD: 5.29) was observed in the SOF group only (p = 0.008). The highest postplacement RFA and RTV values were measured from the SLA group (61.11 ISQ, SD: 7.51 and 78.22 N/cm, SD: 28.73). The early-term (3rd week) BIC% was highest in the SO group (39.93%, SD: 16.14). After 8 weeks, the differences in BIC% values were statistically not significant. CONCLUSIONS Adjunct HF acid application on the thermally oxidized surface did not provide an additional benefit compared to the sandblasted and acid-etched surface (SLA group).
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Affiliation(s)
- Ala Hassan A Qamheya
- Department of Oral Implantology, Faculty of Dentistry, Istanbul University, Istanbul, Turkey
| | - Volkan Arısan
- Department of Oral Implantology, Faculty of Dentistry, Istanbul University, Istanbul, Turkey
| | - Zihni Mutlu
- Department of Surgery, Faculty of Veterinary Medicine, Istanbul University, Avcilar, Turkey
| | - Murat Karabaglı
- Department of Surgery, Faculty of Veterinary Medicine, Istanbul University, Avcilar, Turkey
| | - Merva Soluk Tekkeşin
- Department of Tumor Pathology, Institute of Oncology, Istanbul University, Istanbul, Turkey
| | - Kamuran Kara
- Department of Physics, Faculty of Science, Istanbul University, Istanbul, Turkey
| | - Ayşe Erol
- Department of Physics, Faculty of Science, Istanbul University, Istanbul, Turkey
| | - Selim Ersanlı
- Department of Oral Implantology, Faculty of Dentistry, Istanbul University, Istanbul, Turkey
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Atieh MA, Alsabeeha N, Duncan WJ. Stability of tapered and parallel-walled dental implants: A systematic review and meta-analysis. Clin Implant Dent Relat Res 2018; 20:634-645. [PMID: 29761846 DOI: 10.1111/cid.12623] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Accepted: 04/17/2018] [Indexed: 11/30/2022]
Abstract
BACKGROUND Clinical trials have suggested that dental implants with a tapered configuration have improved stability at placement, allowing immediate placement and/or loading. The aim of this systematic review and meta-analysis was to evaluate the implant stability of tapered dental implants compared to standard parallel-walled dental implants. MATERIALS AND METHODS Applying the guidelines of Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) statement, randomized controlled trials (RCTs) were searched for in electronic databases and complemented by hand searching. The risk of bias was assessed using the Cochrane Collaboration's Risk of Bias tool and data were analyzed using statistical software. RESULTS A total of 1199 studies were identified, of which, five trials were included with 336 dental implants in 303 participants. Overall meta-analysis showed that tapered dental implants had higher implant stability values than parallel-walled dental implants at insertion and 8 weeks but the difference was not statistically significant. Tapered dental implants had significantly less marginal bone loss compared to parallel-walled dental implants. No significant differences in implant failure rate were found between tapered and parallel-walled dental implants. CONCLUSIONS There is limited evidence to demonstrate the effectiveness of tapered dental implants in achieving greater implant stability compared to parallel-walled dental implants. Superior short-term results in maintaining peri-implant marginal bone with tapered dental implants are possible. Further properly designed RCTs are required to endorse the supposed advantages of tapered dental implants in immediate loading protocol and other complex clinical scenarios.
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Affiliation(s)
- Momen A Atieh
- Senior Lecturer in Periodontology, Sir John Walsh Research Institute, Department of Oral Sciences, Faculty of Dentistry, University of Otago, Dunedin, New Zealand
| | - Nabeel Alsabeeha
- Head of Prosthetic Section, Ras Al-Khaimah Dental Center, Ministry of Health, Ras Al-Khaimah, United Arab Emirates
| | - Warwick J Duncan
- Professor in Periodontology, Sir John Walsh Research Institute, Department of Oral Sciences, Faculty of Dentistry, University of Otago, Dunedin, New Zealand
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Díaz-Sánchez RM, Delgado-Muñoz JM, Hita-Iglesias P, Pullen KT, Serrera-Figallo MÁ, Torres-Lagares D. Improvement in the Initial Implant Stability Quotient Through Use of a Modified Surgical Technique. J ORAL IMPLANTOL 2017; 43:186-193. [DOI: 10.1563/aaid-joi-d-16-00159] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
To ensure similar primary implant stability measured by resonance frequency analysis (RFA) could be obtained in different jawbone densities by using a specific surgical drilling protocol and, to correlate those RFA measurements with factors related to the implant design, width, and length, we are performed a 1-year prospective clinical study was carried out using 27 subjects. A total of 67 hydrophilic titanium implants were placed using a standard 2-stage implant placement protocol. The bone type at each implant site was determined by evaluation of a preoperative, high-resolution cone beam computerized tomography (CBCT) scan. A modified drilling protocol was used in softer bone (types 2, 3, and 4) that allowed for greater implant thread contact with the surrounding bone. The implant stability quotient (ISQ) was measured at 4 different times during the study: initially it was determined immediately after implant placement, then again at stage 2 uncovering surgery, then at 6 months' postplacement and, and finally at 1 year postplacement. Data collected immediately after implant surgery demonstrated a high correlation (R2 = .99) between the ISQ and bone type classification. An overall trend toward a higher ISQ was found over the 1-year study period for all types of bone. Implants remained clinically and radiographically stable during the 1-year study period. Our data allow conclude that the primary stability of 2-staged loaded implants placed in different bone types can be optimized by applying this surgical drilling protocol during the implant placement. The ISQ method was found to be a reliable predictor of implant stability.
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Affiliation(s)
| | | | - Pilar Hita-Iglesias
- Department of Oral & Maxillofacial Surgery, University of Michigan School of Dentistry, Ann Arbor, Mich
| | - Kyle T. Pullen
- Department of Oral & Maxillofacial Surgery, University of Michigan School of Dentistry, Ann Arbor, Mich
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Relationship Between Insertion Torque and Resonance Frequency Measurements, Performed by Resonance Frequency Analysis, in Micromobility of Dental Implants: An In Vitro Study. IMPLANT DENT 2017; 24:607-11. [PMID: 26288162 DOI: 10.1097/id.0000000000000318] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
PURPOSE To evaluate the micromobility of dental implants under occlusal loading in relation to stability measurements of resonance frequency analysis and insertion torque. MATERIALS AND METHODS The sample comprised of 24 implants inserted in 12 fresh cow ribs. Insertion torque and Osstell implant stability quotient (ISQ) measurements were recorded. An "ad hoc" acrylic premolar was made on a temporary abutment and screwed to each implant, and a force of 100 N was subsequently applied at an angle of 6 degrees. Implant micromotion was measured using a Questar microscope with a resolution of 2 μm and an image analysis program. RESULTS Data show a statistically significant inverse correlation between the ISQ values and implant micromotion under a load of 100 N (R = 0.86, P < 0.0001). The same relationship is found between insertion torque and implant micromotion, although the relationship is linear up to 34 N·cm and becomes exponential for higher values (R = 0.78, P < 0.0001). A direct correlation is established between insertion torque and ISQ values. CONCLUSION There is an inverse relationship between both ISQ and insertion torque values and implant micromotion under a load of 100 N.
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Influence of the Localization of Frontal Bone Defects on Primary Stability Values of 2 Different Implant Designs: An In Vitro Study. IMPLANT DENT 2017; 26:87-94. [PMID: 28079610 DOI: 10.1097/id.0000000000000536] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVES The aim of this study was to determine the influence of different frontal bone defect localizations on primary stability values of 2 different implant designs. MATERIALS AND METHODS Eight cow rib segments were prepared before implant installation, as 2 segments with coronal, 2 with middle, and 2 with apical defects and 2 with control. Thirty-two cylindrical and 32 tapered implants were placed in the remaining 4 segments. Implant stability measurements were performed using electronic percussive testing and resonance frequency analysis. RESULTS No significance was detected between the stability values of the 2 implant designs except the implant stability quotient (ISQ) of control groups. The tapered implants control group showed significantly higher lateral ISQs compared with cylindrical implants (P = 0.033). For both implant types, stability values were significantly lower in coronal defects (P < 0.01). No significant differences were detected in other defect types. CONCLUSION Within the limitations of this study, it may be concluded that coronal defects may influence primary stability negatively, compared with middle and apical defects. Although statistically not significant, coronal defects caused lower primary stability values with the tapered design compared with parallel design.
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Möhlhenrich SC, Kniha K, Elvers D, Ayoub N, Goloborodko E, Hölzle F, Modabber A. Intraosseous stability of dental implants in free revascularized fibula and iliac crest bone flaps. J Craniomaxillofac Surg 2016; 44:1935-1939. [DOI: 10.1016/j.jcms.2016.09.011] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Revised: 08/08/2016] [Accepted: 09/19/2016] [Indexed: 11/30/2022] Open
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Han HC, Lim HC, Hong JY, Ahn SJ, Han JY, Shin SI, Chung JH, Herr Y, Shin SY. Primary implant stability in a bone model simulating clinical situations for the posterior maxilla: an in vitro study. J Periodontal Implant Sci 2016; 46:254-65. [PMID: 27588215 PMCID: PMC5005813 DOI: 10.5051/jpis.2016.46.4.254] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2016] [Accepted: 07/05/2016] [Indexed: 11/08/2022] Open
Abstract
PURPOSE The aim of this study was to determine the influence of anatomical conditions on primary stability in the models simulating posterior maxilla. METHODS Polyurethane blocks were designed to simulate monocortical (M) and bicortical (B) conditions. Each condition had four subgroups measuring 3 mm (M3, B3), 5 mm (M5, B5), 8 mm (M8, B8), and 12 mm (M12, B12) in residual bone height (RBH). After implant placement, the implant stability quotient (ISQ), Periotest value (PTV), insertion torque (IT), and reverse torque (RT) were measured. Two-factor ANOVA (two cortical conditions×four RBHs) and additional analyses for simple main effects were performed. RESULTS A significant interaction between cortical condition and RBH was demonstrated for all methods measuring stability with two-factor ANOVA. In the analyses for simple main effects, ISQ and PTV were statistically higher in the bicortical groups than the corresponding monocortical groups, respectively. In the monocortical group, ISQ and PTV showed a statistically significant rise with increasing RBH. Measurements of IT and RT showed a similar tendency, measuring highest in the M3 group, followed by the M8, the M5, and the M12 groups. In the bicortical group, all variables showed a similar tendency, with different degrees of rise and decline. The B8 group showed the highest values, followed by the B12, the B5, and the B3 groups. The highest coefficient was demonstrated between ISQ and PTV. CONCLUSIONS Primary stability was enhanced by the presence of bicortex and increased RBH, which may be better demonstrated by ISQ and PTV than by IT and RT.
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Affiliation(s)
- Ho-Chyul Han
- Department of Periodontology, Kyung Hee University School of Dentistry, Seoul, Korea.; Department of Periodontology, Periodontal-Implant Clinical Research Institute, Kyung Hee University Dental Hospital, Seoul, Korea
| | - Hyun-Chang Lim
- Department of Periodontology, Kyung Hee University School of Dentistry, Seoul, Korea.; Department of Periodontology, Periodontal-Implant Clinical Research Institute, Kyung Hee University Dental Hospital, Seoul, Korea
| | - Ji-Youn Hong
- Department of Periodontology, Kyung Hee University School of Dentistry, Seoul, Korea.; Department of Periodontology, Periodontal-Implant Clinical Research Institute, Kyung Hee University Dental Hospital, Seoul, Korea
| | - Su-Jin Ahn
- Department of Biomaterials & Prosthodontics, Institute of Oral Biology, Kyung Hee University School of Dentistry, Seoul, Korea
| | - Ji-Young Han
- Department of Dentistry & Periodontology, Hanyang University College of Medicine, Seoul, Korea
| | - Seung-Il Shin
- Department of Periodontology, Kyung Hee University School of Dentistry, Seoul, Korea.; Department of Periodontology, Periodontal-Implant Clinical Research Institute, Kyung Hee University Dental Hospital, Seoul, Korea
| | - Jong-Hyuk Chung
- Department of Periodontology, Kyung Hee University School of Dentistry, Seoul, Korea.; Department of Periodontology, Periodontal-Implant Clinical Research Institute, Kyung Hee University Dental Hospital, Seoul, Korea
| | - Yeek Herr
- Department of Periodontology, Kyung Hee University School of Dentistry, Seoul, Korea.; Department of Periodontology, Periodontal-Implant Clinical Research Institute, Kyung Hee University Dental Hospital, Seoul, Korea
| | - Seung-Yun Shin
- Department of Periodontology, Kyung Hee University School of Dentistry, Seoul, Korea.; Department of Periodontology, Periodontal-Implant Clinical Research Institute, Kyung Hee University Dental Hospital, Seoul, Korea
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Santamaría-Arrieta G, Brizuela-Velasco A, Fernández-González FJ, Chávarri-Prado D, Chento-Valiente Y, Solaberrieta E, Diéguez-Pereira M, Vega JA, Yurrebaso-Asúa J. Biomechanical evaluation of oversized drilling technique on primary implant stability measured by insertion torque and resonance frequency analysis. J Clin Exp Dent 2016; 8:e307-11. [PMID: 27398182 PMCID: PMC4930641 DOI: 10.4317/jced.52873] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2015] [Accepted: 01/21/2016] [Indexed: 11/30/2022] Open
Abstract
Background This study evaluated the influence of implant site preparation depth on primary stability measured by insertion torque and resonance frequency analysis (RFA). Material and Methods Thirty-two implant sites were prepared in eight veal rib blocks. Sixteen sites were prepared using the conventional drilling sequence recommended by the manufacturer to a working depth of 10mm. The remaining 16 sites were prepared using an oversize drilling technique (overpreparation) to a working depth of 12mm. Bone density was determined using cone beam computerized tomography (CBCT). The implants were placed and primary stability was measured by two methods: insertion torque (Ncm), and RFA (implant stability quotient [ISQ]). Results The highest torque values were achieved by the conventional drilling technique (10mm). The ANOVA test confirmed that there was a significant correlation between torque and drilling depth (p<0.05). However, no statistically significant differences were obtained between ISQ values at 10 or 12 mm drilling depths (p>0.05) at either measurement direction (cortical and medullar). No statistical relation between torque and ISQ values was identified, or between bone density and primary stability (p
>0.05). Conclusions Vertical overpreparation of the implant bed will obtain lower insertion torque values, but does not produce statistically significant differences in ISQ values. Key words:Implant stability quotient, overdrilling, primary stability, resonance frequency analysis, torque.
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Affiliation(s)
- Gorka Santamaría-Arrieta
- Professor Department of Stomatology I, School of Medicine and Dentistry, University of the Basque Country, Leioa, Spain
| | - Aritza Brizuela-Velasco
- Professor Department of Surgery and medical-surgical specialties, University of Oviedo, Oviedo, Spain
| | | | - David Chávarri-Prado
- Professor Department of Stomatology I, School of Medicine and Dentistry, University of the Basque Country, Leioa, Spain
| | - Yelko Chento-Valiente
- Graduate student. Engineering Physics Department of Nuclear Engineering and Fluid Mechanics, Engineering School, University of the Basque Country, Bilbao, Spain
| | - Eneko Solaberrieta
- Researcher. Department of Graphic Design and Engineering Projects, University of the Basque Country UPV/EHU, Bilbao, Spain
| | - Markel Diéguez-Pereira
- Student of oral implantology degree in the University of the Basque Country, Leioa, Spain
| | - José-Antonio Vega
- Professor and full chair. Department of morphology and Cell Biology, University of Oviedo, Spain; Professor. Facultad de Ciencias de la Salud, Universidad Autónoma de Chile, Chile
| | - Jaime Yurrebaso-Asúa
- Student of oral implantology degree in the University of the Basque Country, Leioa, Spain
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Yamaguchi Y, Shiota M, FuJii M, Sekiya M, Ozeki M. Development and application of a direct method to observe the implant/bone interface using simulated bone. SPRINGERPLUS 2016; 5:494. [PMID: 27186458 PMCID: PMC4839028 DOI: 10.1186/s40064-016-2116-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Accepted: 04/06/2016] [Indexed: 11/10/2022]
Abstract
BACKGROUND Primary stability after implant placement is essential for osseointegration. It is important to understand the bone/implant interface for analyzing the influence of implant design on primary stability. In this study rigid polyurethane foam is used as artificial bone to evaluate the bone-implant interface and to identify where the torque is being generated during placement. METHODS Five implant systems-Straumann-Standard (ST), Straumann-Bone Level (BL), Straumann-Tapered Effect (TE), Nobel Biocare-Brånemark MKIII (MK3), and Nobel Biocare-Brånemark MKIV (MK4)-were used for this experiment. Artificial bone blocks were prepared and the implant was installed. After placement, a metal jig and one side artificial bone block were removed and then the implant embedded in the artificial bone was exposed for observing the bone-implant interface. A digital micro-analyzer was used for observing the contact interface. RESULTS The insertion torque values were 39.35, 23.78, 12.53, 26.35, and 17.79 N cm for MK4, BL, ST, TE, and MK3, respectively. In ST, MK3, TE, MK4, and BL the white layer areas were 61 × 103 μm(2), 37 × 103 μm(2), 103 × 103 μm(2) in the tapered portion and 84 × 03 μm(2) in the parallel portion, 134 × 103 μm(2), and 98 × 103 μm(2) in the tapered portion and 87 × 103 μm(2) in the parallel portion, respectively. CONCLUSIONS The direct observation method of the implant/artificial bone interface is a simple and useful method that enables the identification of the area where implant retention occurs. A white layer at the site of stress concentration during implant placement was identified and the magnitude of the stress was quantitatively estimated. The site where the highest torque occurred was the area from the thread crest to the thread root and the under and lateral aspect of the platform. The artificial bone debris created by the self-tapping blade accumulated in both the cutting chamber and in the space between the threads and artificial bone.
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Affiliation(s)
- Yoko Yamaguchi
- Department of Implant Dentistry, School of Dentistry, Showa University, 2-1-1 Kitasenzoku Ota-ku, Tokyo, 145-8515 Japan
| | - Makoto Shiota
- Division of Oral Health Sciences, Department of Masticatory Function Rehabilitation, Oral Implantology and Regenerative Dental Medicine, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8510 Japan
| | - Masaki FuJii
- Dental Implant Clinic, Dental Hospital, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8510 Japan
| | - Michi Sekiya
- Department of Implant Dentistry, School of Dentistry, Showa University, 2-1-1 Kitasenzoku Ota-ku, Tokyo, 145-8515 Japan
| | - Masahiko Ozeki
- Department of Implant Dentistry, School of Dentistry, Showa University, 2-1-1 Kitasenzoku Ota-ku, Tokyo, 145-8515 Japan ; Dental Implant Center, Showa Dental Hospital, 2-1-1 Kitasenzoku Ota-ku, Tokyo, 145-8515 Japan
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A Patient Specific Biomechanical Analysis of Custom Root Analogue Implant Designs on Alveolar Bone Stress: A Finite Element Study. Int J Dent 2016; 2016:8242535. [PMID: 27274727 PMCID: PMC4870362 DOI: 10.1155/2016/8242535] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Accepted: 03/24/2016] [Indexed: 11/18/2022] Open
Abstract
Objectives. The aim of this study was to analyse by means of FEA the influence of 5 custom RAI designs on stress distribution of peri-implant bone and to evaluate the impact on microdisplacement for a specific patient case. Materials and Methods. A 3D surface model of a RAI for the upper right canine was constructed from the cone beam computed tomography data of one patient. Subsequently, five (targeted) press-fit design modification FE models with five congruent bone models were designed: “Standard,” “Prism,” “Fins,” “Plug,” and “Bulbs,” respectively. Preprocessor software was applied to mesh the models. Two loads were applied: an oblique force (300 N) and a vertical force (150 N). Analysis was performed to evaluate stress distributions and deformed contact separation at the peri-implant region. Results. The lowest von Mises stress levels were numerically observed for the Plug design. The lowest levels of contact separation were measured in the Fins model followed by the Bulbs design. Conclusions. Within the limitations of the applied methodology, adding targeted press-fit geometry to the RAI standard design will have a positive effect on stress distribution, lower concentration of bone stress, and will provide a better primary stability for this patient specific case.
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Yamaguchi Y, Shiota M, Munakata M, Kasugai S, Ozeki M. Effect of implant design on primary stability using torque-time curves in artificial bone. Int J Implant Dent 2015; 1:21. [PMID: 27747643 PMCID: PMC5005779 DOI: 10.1186/s40729-015-0024-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Accepted: 07/28/2015] [Indexed: 11/11/2022] Open
Abstract
Background Primary stability following implant placement is essential for osseointegration and is affected by both implant design and bone density. The aim of this study was to compare the relationships between torque-time curves and implant designs in a poor bone quality model. Methods Nine implant designs, with five implants in each category, were compared. A total of 90 implants (Straumann: Standard RN, Bone Level RC, Tapered Effect RN; Nobel Biocare: Brånemark MKIII, MKIV) were placed in type IV artificial bone. Torque-time curves of insertion and removal were recorded at the rate of 1000 samples/s by a torque analyzer. Results The torque-time curves were divided into initial, parallel, tapered, and platform areas. The mean torque rise rate of the parallel area was smallest at 0.36 N · cm/s, with a significant difference from those of the other areas (p < 0.05). Values of 2.14, 2.33, and 2.65 N · cm/s were obtained for the initial, tapered, and platform areas, respectively. The removal torque for six of the implant designs (Bone Level RC 8, 10, and 12 mm; Tapered Effect RN 10 mm; Brånemark MKIII 10 mm, MKIV 10 mm) was significantly smaller than the corresponding insertion torque (p < 0.05). However, the removal torque for ST6, 8, and 10 was almost the same as or slightly greater than the corresponding insertion torque. Conclusions The insertion torque-time curves and design features of the implants were accurately transferred. Increasing implant taper angle appeared to increase the torque rate. Torque was mainly generated from the superior surface to the valley of the thread and the inferior and axial surfaces of the platform, while the inferior and axial surfaces of the thread did not significantly affect torque generation.
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Affiliation(s)
- Yoko Yamaguchi
- Department of Implant Dentistry, Showa University School of Dentistry, 2-1-1 Kitasenzoku Ota-ku, Tokyo, 145-8515, Japan.
| | - Makoto Shiota
- Oral Implantology and Regenerative Dental Medicine, Department of Masticatory Function Rehabilitation, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8510, Japan
| | - Motohiro Munakata
- Oral Implantology Department of Prosthodontic Dentistry for Function of TMJ and Occlusion, Kanagawa Dental University, 82, Inaokachou, Yokosuka-shi, Kanagawa, 238-8580, Japan
| | - Shohei Kasugai
- Oral Implantology and Regenerative Dental Medicine, Department of Masticatory Function Rehabilitation, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8510, Japan
| | - Masahiko Ozeki
- Department of Implant Dentistry, Showa University School of Dentistry, 2-1-1 Kitasenzoku Ota-ku, Tokyo, 145-8515, Japan
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Biomechanics and strain mapping in bone as related to immediately-loaded dental implants. J Biomech 2015; 48:3486-94. [PMID: 26162549 DOI: 10.1016/j.jbiomech.2015.05.014] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Revised: 04/20/2015] [Accepted: 05/14/2015] [Indexed: 11/24/2022]
Abstract
The effects of alveolar bone socket geometry and bone-implant contact on implant biomechanics, and resulting strain distributions in bone were investigated. Following extraction of lateral incisors on a cadaver mandible, implants were placed immediately and bone-implant contact area, stability implant biomechanics and bone strain were measured. In situ biomechanical testing coupled with micro X-ray microscopy (µ-XRM) illustrated less stiff bone-implant complexes (701-822 N/mm) compared with bone-periodontal ligament (PDL)-tooth complexes (791-913 N/mm). X-ray tomograms illustrated that the cause of reduced stiffness was due to limited bone-implant contact. Heterogeneous elemental composition of bone was identified by using energy dispersive X-ray spectroscopy (EDS). The novel aspect of this study was the application of a new experimental mechanics method, that is, digital volume correlation, which allowed mapping of strains in volumes of alveolar bone in contact with a loaded implant. The identified surface and subsurface strain concentrations were a manifestation of load transferred to bone through bone-implant contact based on bone-implant geometry, quality of bone, implant placement, and implant design. 3D strain mapping indicated that strain concentrations are not exclusive to the bone-implant contact regions, but also extend into bone not directly in contact with the implant. The implications of the observed strain concentrations are discussed in the context of mechanobiology. Although a plausible explanation of surgical complications for immediate implant treatment is provided, extrapolation of results is only warranted by future systematic studies on more cadaver specimens and/or in vivo models.
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Schiegnitz E, Al-Nawas B, Tegner A, Sagheb K, Berres M, Kämmerer PW, Wagner W. Clinical and Radiological Long-Term Outcome of a Tapered Implant System with Special Emphasis on the Influence of Augmentation Procedures. Clin Implant Dent Relat Res 2015; 18:810-20. [DOI: 10.1111/cid.12338] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Eik Schiegnitz
- Department of Oral and Maxillofacial Surgery, Plastic Surgery; University Medical Centre; Johannes Gutenberg-University; Mainz Germany
| | - Bilal Al-Nawas
- Department of Oral and Maxillofacial Surgery, Plastic Surgery; University Medical Centre; Johannes Gutenberg-University; Mainz Germany
| | - Alexander Tegner
- Department of Oral and Maxillofacial Surgery, Plastic Surgery; University Medical Centre; Johannes Gutenberg-University; Mainz Germany
| | - Keyvan Sagheb
- Department of Oral and Maxillofacial Surgery, Plastic Surgery; University Medical Centre; Johannes Gutenberg-University; Mainz Germany
| | - Manfred Berres
- Department of Mathematics and Technology; University of Applied Sciences Koblenz; Remagen Germany
- Institute of Medical Biometry, Epidemiology and Informatics; Johannes Gutenberg-University; Mainz Germany
| | - Peer W Kämmerer
- Department of Oral and Maxillofacial Surgery, Plastic Surgery; University of Rostock; Rostock Germany
| | - Wilfried Wagner
- Department of Oral and Maxillofacial Surgery, Plastic Surgery; University Medical Centre; Johannes Gutenberg-University; Mainz Germany
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Template-guided vs. non-guided drilling in site preparation of dental implants. Clin Oral Investig 2014; 19:1339-46. [DOI: 10.1007/s00784-014-1346-7] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Accepted: 10/20/2014] [Indexed: 01/28/2023]
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Torroella-Saura G, Mareque-Bueno J, Cabratosa-Termes J, Hernández-Alfaro F, Ferrés-Padró E, Calvo-Guirado JL. Effect of implant design in immediate loading. A randomized, controlled, split-mouth, prospective clinical trial. Clin Oral Implants Res 2014; 26:240-4. [DOI: 10.1111/clr.12506] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/28/2014] [Indexed: 11/28/2022]
Affiliation(s)
- Gerard Torroella-Saura
- Department of Oral and Maxillofacial Surgery; School of Dentistry; Universitat International de Catalunya; Barcelona Spain
| | - Javier Mareque-Bueno
- Department of Oral and Maxillofacial Surgery; School of Dentistry; Universitat International de Catalunya; Barcelona Spain
| | - Josep Cabratosa-Termes
- Department of Prosthodontics; School of Dentistry; Universitat International de Catalunya; Barcelona Spain
| | - Federico Hernández-Alfaro
- Department of Oral and Maxillofacial Surgery; School of Dentistry; Universitat International de Catalunya; Barcelona Spain
| | - Eduard Ferrés-Padró
- Department of Oral and Maxillofacial Surgery; School of Dentistry; Universitat International de Catalunya; Barcelona Spain
| | - José Luis Calvo-Guirado
- Department of General and mplant Dentistry; School of Medicine and Dentistry; University of Murcia; Murcia Spain
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Jeong TM, Lee JK. The Efficacy of the Graft Materials after Sinus Elevation: Retrospective Comparative Study Using Panoramic Radiography. Maxillofac Plast Reconstr Surg 2014; 36:146-53. [PMID: 27489826 PMCID: PMC4281913 DOI: 10.14402/jkamprs.2014.36.4.146] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Revised: 05/26/2014] [Accepted: 07/15/2014] [Indexed: 11/19/2022] Open
Abstract
Purpose: This study compares and evaluates the efficacy of graft materials after maxillary sinus bone grafts with autogenous tooth bone graft material (AutoBT), demineralized freeze-dried bone allograft (DFDBA) and deproteinized bovine bone mineral (DBBM). Methods: The study involved 30 sinuses in 26 patients who visited the Division of Oral and Maxillofacial Surgery, Department of Dentistry in Ajou University Hospital and received either AutoBT, DFDBA or DBBM with sinus elevation using the lateral window technique. Sinus graft height was measured before, immediately after, and six months after bone graft with panoramic radiography and the height changes of the sinus floor was compared according to the graft materials. Results: After six months, the decrease ratio of graft heights were 13.57% for AutoBT group, 14.30% for DFDBA group, and 11.92% for DBBM group. There was no statistically significant difference. Conclusion: The new maxillary sinus floor formed by the upper border of bone graft material, can repneumatize after the maxillary sinus elevation. Thus, long-term stability of sinus graft height represents an important factor for implant success. We found that the three graft materials for sinus elevation do not differ significantly and all three graft materials showed excellent resistance to maxillary sinus repneumatization. However, due to the special circumstances of the maxillary sinus and small sample, the actual difference between the three graft materials may not have been detectable. Therefore further study needs to be conducted for more reliable study results.
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Affiliation(s)
- Tae Min Jeong
- Division of Oral and Maxillofacial Surgery, Department of Dentistry, Ajou University School of Medicine
| | - Jeong Keun Lee
- Division of Oral and Maxillofacial Surgery, Department of Dentistry, Ajou University School of Medicine
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Influence of thread pitch, helix angle, and compactness on micromotion of immediately loaded implants in three types of bone quality: a three-dimensional finite element analysis. BIOMED RESEARCH INTERNATIONAL 2014; 2014:983103. [PMID: 25110716 PMCID: PMC4109075 DOI: 10.1155/2014/983103] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/19/2014] [Revised: 04/16/2014] [Accepted: 04/19/2014] [Indexed: 11/27/2022]
Abstract
This study investigated the influence of thread pitch, helix angle, and compactness on micromotion in immediately loaded implants in bone of varying density (D2, D3, and D4). Five models of the three-dimensional finite element (0.8 mm pitch, 1.6 mm pitch, 2.4 mm pitch, double-threaded, and triple-threaded implants) in three types of bone were created using Pro/E, Hypermesh, and ABAQUS software. The study had three groups: Group 1, different pitches (Pitch Group); Group 2, same compactness but different helix angles (Angle Group); and Group 3, same helix angle but different compactness (Compact Group). Implant micromotion was assessed as the comprehensive relative displacement. We found that vertical relative displacement was affected by thread pitch, helix angle, and compactness. Under vertical loading, displacement was positively correlated with thread pitch and helix angle but negatively with compactness. Under horizontal loading in D2, the influence of pitch, helix angle, and compactness on implant stability was limited; however, in D3 and D4, the influence of pitch, helix angle, and compactness on implant stability is increased. The additional evidence was provided that trabecular bone density has less effect on implant micromotion than cortical bone thickness. Bone type amplifies the influence of thread pattern on displacement.
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Kim DS, Lee WJ, Choi SC, Lee SS, Heo MS, Huh KH, Kim TI, Yi WJ. Comparison of dental implant stabilities by impact response and resonance frequencies using artificial bone. Med Eng Phys 2014; 36:715-20. [DOI: 10.1016/j.medengphy.2013.12.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Revised: 11/15/2013] [Accepted: 12/01/2013] [Indexed: 11/25/2022]
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Huang HL, Tsai MT, Su KC, Li YF, Hsu JT, Chang CH, Fuh LJ, Wu AYJ. Relation between initial implant stability quotient and bone-implant contact percentage: an in vitro model study. Oral Surg Oral Med Oral Pathol Oral Radiol 2013; 116:e356-61. [DOI: 10.1016/j.oooo.2012.01.037] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2011] [Revised: 01/13/2012] [Accepted: 01/23/2012] [Indexed: 11/29/2022]
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Oliscovicz NF, Valente MLDC, Marcantonio Junior E, Shimano AC, Reis ACD. Estudo in vitro da influência do formato e do tratamento de superfície de implantes odontológicos no torque de inserção, resistência ao arrancamento e frequência de ressonância. REVISTA DE ODONTOLOGIA DA UNESP 2013. [DOI: 10.1590/s1807-25772013000400008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
OBJETIVO: A proposta do estudo foi avaliar a influência do formato e do tratamento de superfície na estabilidade primária de implantes odontológicos, inseridos em diferentes substratos, utilizando-se associação de métodos, como torque de inserção, resistência ao arrancamento e frequência de ressonância. MATERIAL E MÉTODO: Foram utilizados 32 implantes da marca Conexão® (Conexão Sistemas de Prótese Ltda, Arujá, São Paulo, Brasil), sendo: oito cilíndricos com tratamento Porous (CA), oito cilíndricos usinados (MS), oito cilíndricos tratamento duplo Porous (MP) e oito cônicos sem tratamento (CC). Os substratos utilizados para inserção foram: costela de porco; poliuretana Synbone©; poliuretana Nacional® (15, 20, 40 PCF), e madeira. O torque de inserção (TI) foi quantificado utilizando-se um torquímetro digital Kratos®; a força de arrancamento (RA) foi aferida por meio de tração axial, realizada em uma Máquina Universal de Ensaios (Emic® DL-10000), e utilizou-se também análise por meio de frequência de ressonância (RF). Para obtenção dos resultados estatísticos, utilizou-se análise de variância e teste de Tukey (significância de 5%). RESULTADO: Ao analisar o torque de inserção, verificou-se que os implantes com tratamento de superfície não foram diferentes estatisticamente dos usinados, assim como os implantes cilíndricos não tiveram diferença dos cônicos em todos os substratos (p>0,05), com exceção da poliuretana Synbone©. Em relação à resistência ao arrancamento, os implantes tratados e usinados, assim como cônicos e cilíndricos, não tiveram diferença estatística (p>0,05); a análise de frequência de ressonância mostrou que não houve diferença entre os implantes (p>0,05), com exceção da poliuretana Nacional® (20 PCF). CONCLUSÃO: Os formatos e o tratamento de superfície estudados não demonstraram valores significantes quando foram comparados os implantes entre si e, considerando os substratos avaliados, não houve diferença estatística entre os diferentes tipos de implantes.
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Kokovic V, Jung R, Feloutzis A, Todorovic VS, Jurisic M, Hämmerle CHF. Immediate vs. early loading of SLA implants in the posterior mandible: 5-year results of randomized controlled clinical trial. Clin Oral Implants Res 2012; 25:e114-9. [DOI: 10.1111/clr.12072] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/14/2012] [Indexed: 11/27/2022]
Affiliation(s)
| | - Ronald Jung
- Clinic of Fixed and Removable Prosthodontics and Dental Material Sciences; Center for Dental and Oral Medicine; University of Zurich; Zurich Switzerland
| | | | - Vladimir S. Todorovic
- Clinic of Oral Surgery; School of Dentistry; University of Belgrade; Belgrade Serbia
| | - Milan Jurisic
- Clinic of Oral Surgery; School of Dentistry; University of Belgrade; Belgrade Serbia
| | - Christoph H. F. Hämmerle
- Clinic of Fixed and Removable Prosthodontics and Dental Material Sciences; Center for Dental and Oral Medicine; University of Zurich; Zurich Switzerland
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Atieh MA, Alsabeeha NHM, Payne AGT, de Silva RK, Schwass DS, Duncan WJ. The prognostic accuracy of resonance frequency analysis in predicting failure risk of immediately restored implants. Clin Oral Implants Res 2012; 25:29-35. [DOI: 10.1111/clr.12057] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/08/2012] [Indexed: 11/26/2022]
Affiliation(s)
- Momen A. Atieh
- Oral Implantology Research Group; Sir John Walsh Research Institute; School of Dentistry; University of Otago; 310 Great King Street Dunedin New Zealand
| | | | | | - Rohana K. de Silva
- Oral Implantology Research Group; Sir John Walsh Research Institute; School of Dentistry; University of Otago; 310 Great King Street Dunedin New Zealand
| | - Donald S. Schwass
- Oral Implantology Research Group; Sir John Walsh Research Institute; School of Dentistry; University of Otago; 310 Great King Street Dunedin New Zealand
| | - Warwick J. Duncan
- Oral Implantology Research Group; Sir John Walsh Research Institute; School of Dentistry; University of Otago; 310 Great King Street Dunedin New Zealand
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Ahn SJ, Leesungbok R, Lee SW, Heo YK, Kang KL. Differences in implant stability associated with various methods of preparation of the implant bed: An in vitro study. J Prosthet Dent 2012; 107:366-72. [DOI: 10.1016/s0022-3913(12)60092-4] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Relation between insertion torque and bone-implant contact percentage: an artificial bone study. Clin Oral Investig 2012; 16:1679-84. [PMID: 22228023 DOI: 10.1007/s00784-011-0658-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2011] [Accepted: 12/08/2011] [Indexed: 10/14/2022]
Abstract
OBJECTIVES The purpose of this study was to determine the correlation between the peak insertion torque value (ITV) of a dental implant and the bone-implant contact percentage (BIC%). MATERIAL AND METHODS Dental implants were inserted into specimens comprising a 2-mm-thick artificial cortical shell representing cortical bone and artificial foam bone representing cancellous bone with four densities (groups 1 to 4--0.32, 0.20, 0.16, and 0.12 g/cm(3)). Each specimen with an inserted implant was subjected to micro-computed tomography (micro-CT) scanning, from which the 3D BIC% values were calculated. Pearson's correlation coefficients (r) between the ITV and BIC% were calculated. RESULTS The ITVs in groups 1 to 4 were 56.2 ± 4.6 (mean±standard deviation), 45.6 ± 0.9, 43.3 ± 4.3, and 38.5 ± 3.4 N cm, respectively, and the corresponding BIC% values were 41.5 ± 0.5%, 39.0 ± 1.0%, 30.8 ± 1.1%, and 26.2 ± 1.6%. Pearson's correlation coefficient between the ITV and BIC% was r = 0.797 (P < 0.0001). CONCLUSION The initial implant stability, quantified as the ITV, was strongly positively correlated with the 3D BIC% obtained from micro-CT images. CLINICAL RELEVANCE The ITV of a dental implant can be used to predict the initial BIC%; this information may provide the clinician with important information on the optimal loading time.
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Campos FE, Gomes JB, Marin C, Teixeira HS, Suzuki M, Witek L, Zanetta-Barbosa D, Coelho PG. Effect of Drilling Dimension on Implant Placement Torque and Early Osseointegration Stages: An Experimental Study in Dogs. J Oral Maxillofac Surg 2012; 70:e43-50. [DOI: 10.1016/j.joms.2011.08.006] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2011] [Revised: 08/01/2011] [Accepted: 08/04/2011] [Indexed: 10/14/2022]
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