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Fathi A, Rismanchian M, Khodadadi R, Dezaki SN. Does the crown-implant ratio affect the survival and complications of implant-supported prostheses? A systematic review. J Prosthet Dent 2024; 131:819-825. [PMID: 35469647 DOI: 10.1016/j.prosdent.2022.03.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Revised: 03/09/2022] [Accepted: 03/09/2022] [Indexed: 12/29/2022]
Abstract
STATEMENT OF PROBLEM The use of dental implants shorter than 10 mm in length increases the crown-implant ratio. Whether an increased crown-implant ratio affects the survival rate and complications is unclear. PURPOSE The purpose of this systematic review was to investigate the effect of the crown-implant ratio on the survival rate and complications of implant-supported prostheses. MATERIALS AND METHODS Five databases (PubMed, MEDLINE, Scopus, Google Scholar, and Cochrane) were electronically and manually searched for longitudinal studies with a follow-up period of 3 years or longer. The study question was "Does the crown-implant ratio affect survival rate and complications of implant-supported prostheses?" The outcomes investigated were implant survival rate, peri-implant bone resorption rate, implant fracture rate, and other technical complications in the implant components. RESULTS A total of 670 studies were identified from the research in the databases. By applying the inclusion and exclusion criteria to the full texts, 17 articles were included for descriptive analysis. Qualitative data analysis showed that the survival rate of implant-supported prostheses with a crown-implant ratio greater than 2 was 97.2%, and for a ratio lower than 1, it was about 97.6%. Moreover, 9 papers reported that increasing the crown-implant ratio reduced bone resorption, while 8 other studies reported no significant association between the increase in the crown-implant ratio and bone resorption. CONCLUSIONS No significant relationship was found between the crown-implant ratio and implant survival rate. However, increasing the crown-implant ratio is likely to decrease bone loss around the implant. Information was insufficient to analyze the relationship between the crown-implant ratio and technical complications in implant-supported prostheses.
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Affiliation(s)
- Amirhossein Fathi
- Assistant Professor, Dental Prosthodontics Department, Dental Materials Research Center, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
| | - Mansour Rismanchian
- Professor, Dental Prosthodontics Department, Dental Implants Research Center, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Reza Khodadadi
- Assistant Professor, Dental Prosthodontics Department, Dental Implants Research Center, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Sara Nasrollahi Dezaki
- Graduate student, Dental Students Research Committee, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
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Zhang JP, Wang ZH, Zhang J, Qiu J. Convolutional neural network-based measurement of crown-implant ratio for implant-supported prostheses. J Prosthet Dent 2024:S0022-3913(24)00008-8. [PMID: 38278668 DOI: 10.1016/j.prosdent.2024.01.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2023] [Revised: 01/03/2024] [Accepted: 01/08/2024] [Indexed: 01/28/2024]
Abstract
STATEMENT OF PROBLEM Research has revealed that the crown-implant ratio (CIR) is a critical variable influencing the long-term stability of implant-supported prostheses in the oral cavity. Nevertheless, inefficient manual measurement and varied measurement methods have caused significant inconvenience in both clinical and scientific work. PURPOSE This study aimed to develop an automated system for detecting the CIR of implant-supported prostheses from radiographs, with the objective of enhancing the efficiency of radiograph interpretation for dentists. MATERIAL AND METHODS The method for measuring the CIR of implant-supported prostheses was based on convolutional neural networks (CNNs) and was designed to recognize implant-supported prostheses and identify key points around it. The experiment used the You Only Look Once version 4 (Yolov4) to locate the implant-supported prosthesis using a rectangular frame. Subsequently, two CNNs were used to identify key points. The first CNN determined the general position of the feature points, while the second CNN finetuned the output of the first network to precisely locate the key points. The network underwent testing on a self-built dataset, and the anatomic CIR and clinical CIR were obtained simultaneously through the vertical distance method. Key point accuracy was validated through Normalized Error (NE) values, and a set of data was selected to compare machine and manual measurement results. For statistical analysis, the paired t test was applied (α=.05). RESULTS A dataset comprising 1106 images was constructed. The integration of multiple networks demonstrated satisfactory recognition of implant-supported prostheses and their surrounding key points. The average NE value for key points indicated a high level of accuracy. Statistical studies confirmed no significant difference in the crown-implant ratio between machine and manual measurement results (P>.05). CONCLUSIONS Machine learning proved effective in identifying implant-supported prostheses and detecting their crown-implant ratios. If applied as a clinical tool for analyzing radiographs, this research can assist dentists in efficiently and accurately obtaining crown-implant ratio results.
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Affiliation(s)
- Jin-Ping Zhang
- Postgraduate student, Department of Oral Implantology, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, PR China
| | - Ze-Hui Wang
- Graduate student, Jiangsu University of Science and Technology, Zhenjiang, PR China
| | - Juan Zhang
- Graduate student, Zhenjiang Stomatological Hospital, Zhenjiang, PR China
| | - Jing Qiu
- Professor, Department of Oral Implantology, Affiliated Hospital of Stomatology, Jiangsu Province Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, PR China.
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Häggman-Henrikson B, Ali D, Aljamal M, Chrcanovic BR. Bruxism and dental implants: A systematic review and meta-analysis. J Oral Rehabil 2024; 51:202-217. [PMID: 37589382 DOI: 10.1111/joor.13567] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 04/24/2023] [Accepted: 08/07/2023] [Indexed: 08/18/2023]
Abstract
BACKGROUND Overload from bruxism may affect survival of dental implants. OBJECTIVES To evaluate implant failure and marginal bone loss (MBL) in patients presenting with probable bruxism compared to non-bruxers. The study was registered in PROSPERO (CRD42021238397). METHODS An electronic search September 2022 in PubMed/Medline, Web of Science and Science Direct was combined with a hand search. Two independent reviewers carried out abstract screening, full-text assessment, quality assessment (National Institutes of Health tool) and data extraction. Only studies that provided information on self-report and clinical examination needed for the diagnosis of at least 'probable' bruxism were included. A pairwise random-effect meta-analysis was carried out. RESULTS In total 1338 studies were identified, and after screening and full-text assessment 27 studies that presented data on 2105 implants in probable bruxers and 10 264 implants in non-bruxers were included, with 138 and 352 implant failures in respective groups. the meta-analysis showed that implants placed in probable bruxers had a higher risk of failure than in non-bruxers (OR 2.189; 95% CI 1.337, 3.583, p = .002). A meta-regression showed that follow-up time did not affect this OR. Eighteen studies provided general data on MBL but did not report results separated between bruxers and non-bruxers. Therefore, an analysis of MBL was not possible. CONCLUSION The results of the present systematic review show that implants placed in probable bruxers present a significantly higher risk of failure than implants placed in non-bruxers. This should be considered in treatment planning and management of implant patients.
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Affiliation(s)
| | - David Ali
- Faculty of Odontology, Malmö University, Malmö, Sweden
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Yuan X, Liu Y, Yang Y, Ren M, Luo L, Zheng L, Liu Y. Effect of short implant crown-to-implant ratio on stress distribution in anisotropic bone with different osseointegration rates. BMC Oral Health 2023; 23:683. [PMID: 37730562 PMCID: PMC10512631 DOI: 10.1186/s12903-023-03379-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Accepted: 08/31/2023] [Indexed: 09/22/2023] Open
Abstract
OBJECTIVE This study aimed to provide evidence for the clinical application of single short implants by establishing an anisotropic, three-dimensional (3D) finite element mandible model and simulating the effect of crown-to-implant ratio (CIR) on biomechanics around short implants with different osseointegration rates. METHODS Assuming that the bone is transversely isotropic by finite element method, we created four distinct models of implants for the mandibular first molar. Subsequently, axial and oblique forces were applied to the occlusal surface of these models. Ultimately, the Abaqus 2020 software was employed to compute various mechanical parameters, including the maximum von Mises stress, tensile stress, compressive stress, shear stress, displacement, and strains in the peri-implant bone tissue. RESULTS Upon establishing consistent osseointegration rates, the distribution of stress exhibited similarities across models with varying CIRs when subjected to vertical loads. However, when exposed to inclined loads, the maximum von Mises stress within the cortical bone escalated as the CIR heightened. Among both loading scenarios, notable escalation in the maximum von Mises stress occurred in the model featuring a CIR of 2.5 and an osseointegration rate of 25%. Conversely, other models displayed comparable strength. Notably, stress and strain values uniformly increased with augmented osseointegration across all models. Furthermore, an increase in osseointegration rate correlated with reduced maximum displacement for both cortical bone and implants. CONCLUSIONS After fixing osseointegration rates, the stress around shorter implants increased as the CIR increased under inclined loads. Thus, the effect of lateral forces should be considered when selecting shorter implants. Moreover, an implant failure risk was present in cases with a CIR ≥ 2.5 and low osseointegration rates. Additionally, the higher the osseointegration rate, the more readily the implant can achieve robust stability.
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Affiliation(s)
- Xi Yuan
- Affiliated Hospital of Shaanxi University of Chinese Medicine, Xianyang, 712000, China
| | - Yuchen Liu
- Dalian University of Technology, Dalian, 116000, China
| | - Yunhe Yang
- Dalian Stomatological Hospital, Dalian, 116000, China
| | - Mingfa Ren
- Dalian University of Technology, Dalian, 116000, China
| | - Lailong Luo
- Dalian University of Technology, Dalian, 116000, China
| | - Lang Zheng
- Dalian University, Dalian, 116000, China
| | - Yang Liu
- Department of Prosthodontics, Dalian Stomatological Hospital, 935 Changjiang Road, Shahekou District, Dalian, 116000, China.
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Abdul Rahim M, Khan K, Chrcanovic BR. Influence of Crown-Implant Ratio and Implant Inclination on Marginal Bone Loss around Dental Implants Supporting Single Crowns in the Posterior Region: A Retrospective Clinical Study. J Clin Med 2023; 12:jcm12093219. [PMID: 37176659 PMCID: PMC10179148 DOI: 10.3390/jcm12093219] [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: 03/31/2023] [Revised: 04/23/2023] [Accepted: 04/28/2023] [Indexed: 05/15/2023] Open
Abstract
The aim of this present record-based retrospective study was to investigate the influence of the crown-implant ratio (CIR) and implant inclination in relation to the occlusal plane on the marginal bone loss (MBL) around dental implants supporting single crowns in the posterior region of the jaws. All the cases of implant-supported single crowns in the premolar and molar regions were initially considered for inclusion. Only implants not lost, with baseline radiographs taken within 12 months after implant placement and with a minimum of 36 months of radiological follow-up, were considered for the analysis of MBL. Univariate linear regression models were used to compare MBL over time between 12 clinical covariates, after which a linear mixed-effects model was built. After the exclusion of 49 cases, a total of 316 implant-supported single crowns in 234 patients were included. The results from the statistical models suggested that implant inclination and anatomical- and clinical CIR (the main related factors investigated in the study) were not statistically significantly related to MBL over time. Age (older people), tooth region (premolar), and bruxism (bruxers) had a statistically significant influence on MBL over time.
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Affiliation(s)
| | - Kashmala Khan
- Faculty of Odontology, Malmö University, 214 21 Malmö, Sweden
| | - Bruno Ramos Chrcanovic
- Department of Prosthodontics, Faculty of Odontology, Malmö University, 214 21 Malmö, Sweden
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Nielsen HB, Schou S, Bruun NH, Starch-Jensen T. Single-crown restorations supported by short implants (6 mm) compared with standard-length implants (13 mm) in conjunction with maxillary sinus floor augmentation: a randomized, controlled clinical trial. Int J Implant Dent 2021; 7:66. [PMID: 34268630 PMCID: PMC8282885 DOI: 10.1186/s40729-021-00348-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Accepted: 04/22/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The purpose of the present study was to test the H0-hypothesis of no difference in the clinical and radiographical treatment outcome of single-crown restorations supported by short implants compared with standard length implants in conjunction with maxillary sinus floor augmentation (MSFA) after 1 year of functional implant loading. Forty patients with partial edentulism in the posterior part of the maxilla were randomly allocated to treatment involving single-crown restorations supported by short implants or standard length implants in conjunction with MSFA. Clinical and radiographical evaluation were used to assess survival of suprastructures and implants, peri-implant marginal bone loss (PIMBL), biological, and mechanical complications. RESULTS Both treatment modalities were characterized by 100% survival of suprastructures and implants after 1 year. Mean PIMBL was 0.60 mm with short implants compared with 0.51 mm with standard length implants after 1 year of functional loading. There were no statistically significant differences in survival of suprastructure and implants, PIMBL, and mechanical complications between the two treatment modalities. However, a higher incidence of biological complications was associated with standard length implants in conjunction with MSFA. CONCLUSION Within the limitations of the present study, it can be concluded that single-crown restorations supported by short implants seems to be comparable with standard length implants in conjunction with MSFA. However, long-term studies are needed before final conclusions can be provided about the two treatment modalities. TRIAL REGISTRATION Clinicaltrials.Gov ID: NCT04518020 . Date of registration: August 14, 2020, retrospectively registered.
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Affiliation(s)
- Helle Baungaard Nielsen
- Department of Oral and Maxillofacial Surgery, Aalborg University Hospital, Aalborg, Denmark.
| | - Søren Schou
- Department of Periodontology, School of Dentistry, University of Copenhagen, Copenhagen, Denmark
| | - Niels Henrik Bruun
- Unit of Epidemiology and Biostatistics, Aalborg University Hospital, Aalborg, Denmark
| | - Thomas Starch-Jensen
- Department of Oral and Maxillofacial Surgery, Aalborg University Hospital, Aalborg, Denmark
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Yu X, Xu R, Zhang Z, Yang Y, Deng F. A meta-analysis indicating extra-short implants (≤ 6 mm) as an alternative to longer implants (≥ 8 mm) with bone augmentation. Sci Rep 2021; 11:8152. [PMID: 33854095 PMCID: PMC8047002 DOI: 10.1038/s41598-021-87507-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Accepted: 03/30/2021] [Indexed: 12/28/2022] Open
Abstract
Extra-short implants, of which clinical outcomes remain controversial, are becoming a potential option rather than long implants with bone augmentation in atrophic partially or totally edentulous jaws. The aim of this study was to compare the clinical outcomes and complications between extra-short implants (≤ 6 mm) and longer implants (≥ 8 mm), with and without bone augmentation procedures. Electronic (via PubMed, Web of Science, EMBASE, Cochrane Library) and manual searches were performed for articles published prior to November 2020. Only randomized controlled trials (RCTs) comparing extra-short implants and longer implants in the same study reporting survival rate with an observation period at least 1 year were selected. Data extraction and methodological quality (AMSTAR-2) was assessed by 2 authors independently. A quantitative meta-analysis was performed to compare the survival rate, marginal bone loss (MBL), biological and prosthesis complication rate. Risk of bias was assessed with the Cochrane risk of bias tool 2 and the quality of evidence was determined with the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) approach. 21 RCTs were included, among which two were prior registered and 14 adhered to the CONSORT statement. No significant difference was found in the survival rate between extra-short and longer implant at 1- and 3-years follow-up (RR: 1.002, CI 0.981 to 1.024, P = 0.856 at 1 year; RR: 0.996, CI 0.968 to 1.025, P = 0.772 at 3 years, moderate quality), while longer implants had significantly higher survival rate than extra-short implants (RR: 0.970, CI 0.944 to 0.997, P < 0.05) at 5 years. Interestingly, no significant difference was observed when bone augmentations were performed at 5 years (RR: 0.977, CI 0.945 to 1.010, P = 0.171 for reconstructed bone; RR: 0.955, CI 0.912 to 0.999, P < 0.05 for native bone). Both the MBL (from implant placement) (WMD: - 0.22, CI - 0.277 to - 0.164, P < 0.01, low quality) and biological complications rate (RR: 0.321, CI 0.243 to 0.422, P < 0.01, moderate quality) preferred extra-short implants. However, there was no significant difference in terms of MBL (from prosthesis restoration) (WMD: 0.016, CI - 0.036 to 0.068, P = 0.555, moderate quality) or prosthesis complications rate (RR: 1.308, CI 0.893 to 1.915, P = 0.168, moderate quality). The placement of extra-short implants could be an acceptable alternative to longer implants in atrophic posterior arch. Further high-quality RCTs with a long follow-up period are required to corroborate the present outcomes.Registration number The review protocol was registered with PROSPERO (CRD42020155342).
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Affiliation(s)
- Xiaoran Yu
- Department of Oral Implantology, Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, 56 Ling Yuan Xi Road, Guangzhou, 510006, Guangdong, People's Republic of China.,Guangdong Provincial Key Laboratory of Stomatology, 74 Zhong Shan Er Road, Guangzhou, 510006, Guangdong, People's Republic of China
| | - Ruogu Xu
- Department of Oral Implantology, Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, 56 Ling Yuan Xi Road, Guangzhou, 510006, Guangdong, People's Republic of China.,Guangdong Provincial Key Laboratory of Stomatology, 74 Zhong Shan Er Road, Guangzhou, 510006, Guangdong, People's Republic of China
| | - Zhengchuan Zhang
- Department of Oral Implantology, Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, 56 Ling Yuan Xi Road, Guangzhou, 510006, Guangdong, People's Republic of China.,Guangdong Provincial Key Laboratory of Stomatology, 74 Zhong Shan Er Road, Guangzhou, 510006, Guangdong, People's Republic of China
| | - Yang Yang
- Department of Oral Implantology, Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, 56 Ling Yuan Xi Road, Guangzhou, 510006, Guangdong, People's Republic of China.,Guangdong Provincial Key Laboratory of Stomatology, 74 Zhong Shan Er Road, Guangzhou, 510006, Guangdong, People's Republic of China
| | - Feilong Deng
- Department of Oral Implantology, Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, 56 Ling Yuan Xi Road, Guangzhou, 510006, Guangdong, People's Republic of China. .,Guangdong Provincial Key Laboratory of Stomatology, 74 Zhong Shan Er Road, Guangzhou, 510006, Guangdong, People's Republic of China.
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Benalcázar Jalkh EB, Neto JDS, Bergamo ETP, Maia CF, Bonfante EA. Mechanical testing of four-unit implant-supported prostheses with extensive pink gingiva porcelain: The dentogingival prostheses proof of concept. J ESTHET RESTOR DENT 2021; 33:605-612. [PMID: 33423375 DOI: 10.1111/jerd.12704] [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: 05/27/2020] [Revised: 11/18/2020] [Accepted: 12/17/2020] [Indexed: 12/01/2022]
Abstract
OBJECTIVE To investigate the probability of survival and failure modes of four-unit implant-supported porcelain fused to metal (PFM) dentogingival prostheses subjected to step-stress accelerated life testing (SSALT). MATERIALS AND METHODS Eighteen implant-supported PFM dentogingival prostheses with thin metallic infrastructures, which provided minimal ceramic support and improved esthetics were fabricated over external hexagonal connection UCLA abutments. SSALT was performed until specimen failure. Use level probability Weibull curve and reliability were calculated and plotted. Weibull modulus (m) and characteristic strength (η) were also calculated. Polarized light microscope and scanning electron microscope were used to characterize fractures. RESULTS Failures were dictated by material strength rather than fatigue damage accumulation. The probability of survival for loads reaching 100 and 150 N in 100,000 cycles was 92 and 61%, respectively. No cracks or fractures were identified in the veneered porcelain, whereas abutment fixation screw fracture was the chief failure mode. CONCLUSION Implant-supported PFM four-unit dentogingival prostheses with minimum metal framework dimensions presented favorable lifetime prediction under fatigue testing. Fractures were restricted to fixation screws. CLINICAL SIGNIFICANCE In-vitro fatigue testing and failure mode analyses evidenced favorable lifetime prediction for 4-unit implant-supported dentogingival prostheses with minimum metal frameworks. Abutment fixation screw fracture might be the most frequent clinical complication. Since this proof of concept has been tested in-vitro, further studies including different restorative materials, as well as long-term clinical trials are warranted.
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Affiliation(s)
- Ernesto B Benalcázar Jalkh
- Department of Prosthodontics and Periodontology, University of São Paulo, Bauru School of Dentistry, Bauru, SP, Brazil
| | | | - Edmara T P Bergamo
- Department of Prosthodontics and Periodontology, University of São Paulo, Bauru School of Dentistry, Bauru, SP, Brazil
| | | | - Estevam A Bonfante
- Department of Prosthodontics and Periodontology, University of São Paulo, Bauru School of Dentistry, Bauru, SP, Brazil
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Padhye NM, Lakha T, Naenni N, Kheur M. Effect of crown-to-implant ratio on the marginal bone level changes and implant survival - A systematic review and meta-analysis. J Oral Biol Craniofac Res 2020; 10:705-713. [PMID: 33072508 DOI: 10.1016/j.jobcr.2020.10.002] [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: 08/24/2020] [Revised: 09/29/2020] [Accepted: 10/01/2020] [Indexed: 11/18/2022] Open
Abstract
The purpose of the systematic review and meta-analysis was to analyze the existing evidence regarding the effect of crown-to-implant ratio (CIR) on the peri-implant crestal bone level change and implant survival. Randomized controlled clinical trials, prospective as well as retrospective studies with a minimum follow-up period of 12 months and 10 patients per group were included for this systematic review. Statistical analysis was performed to determine CIR effects on the peri-implant marginal bone level changes and implant survival. A total of 28 articles (14 prospective studies and 14 retrospective studies) from a database of 201 articles, with 2097 patients and 4350 implants, were included. A mean CIR ranging from 0.6 to 2.44 was presented by the study groups. A weighted mean implant loss of 0.19% per year and peri-implant marginal bone level change of 0.63 mm ± 0.55 over 46.8 ± 5.2 months was calculated from the included studies. The peri-implant marginal bone level change (p = 0.155) and the rate of implant loss (p = 0.245) showed a statistically insignificant difference between implant restorations of a high (>1.5:1) and low (<1.5:1) CIR. Within its limitations, this review concludes that a high (>1.5:1) or a low (<1.5:1) CIR does not significantly affect the peri-implant marginal bone level change and implant survival rate. However, until further evidence becomes available, extrapolation to long term clinical success cannot be ascertained.
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Affiliation(s)
| | - Tabrez Lakha
- Department of Fixed and Removable Prosthodontics, M.A. Rangoonwala Dental College and Research Center, Pune, India
| | - Nadja Naenni
- Swiss Society of Reconstructive Dentistry, Clinic of Reconstructive Dentistry, Center of Dental Medicine, University of Zurich, Switzerland
| | - Mohit Kheur
- Department of Fixed and Removable Prosthodontics, M.A. Rangoonwala Dental College and Research Center, Pune, India
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10
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CT-based dentulous mandibular alveolar ridge measurements as predictors of crown-to-implant ratio for short and extra short dental implants. Sci Rep 2020; 10:16229. [PMID: 33004827 PMCID: PMC7530749 DOI: 10.1038/s41598-020-73180-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Accepted: 08/25/2020] [Indexed: 12/17/2022] Open
Abstract
The purpose was to predict the crown-to-implant ratio variation in the edentulous posterior mandibles rehabilitated with short dental implants. Hence, vertical and horizontal dimensions of dentulous posterior mandibles in a sample of 18- to 25-year-olds were measured, and correlations of these dimensions with sex and site were investigated. Mandibular computed tomography scans from 100 subjects were considered. Vertical and horizontal bone and tooth measurements were taken at the sites of the second premolar (PM), and the mesial and distal roots of the first and second molars (M1m, M1d, M2m and M2d, respectively). A hypothetical crown-to-implant ratio (C/I R) was calculated assuming the insertion of short and extra short implants (5, 6 or 7 mm), at 1.5 mm from the inferior alveolar canal, maintaining the position of the existing occlusal plane. All vertical bone dimensions decreased from the PM to the M2d. Width measurements increased from the mesial (PM) to the distal sites (M1m, M1d, M2m and M2d). Males had significantly greater vertical and horizontal measurements than females at all sites. The mean C/I R was higher than 2 for all sizes of implant. The C/I R was lower for the second molar than for the second premolar, while it was similar for the first molar and the second premolar. Males had a higher C/I R than females. Computed tomography can be used to study the anatomical features of alveolar bone, and to predict some clinical aspects of prosthetic rehabilitation with implants, such as the crown-to-implant ratio in conditions of serious bone atrophy.
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11
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Kataoka T, Akagi Y, Kagawa C, Sasaki R, Okamoto T, Ando T. A case of effective oral rehabilitation after mandibular resection. Clin Case Rep 2019; 7:2143-2148. [PMID: 31788267 PMCID: PMC6878091 DOI: 10.1002/ccr3.2459] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 08/21/2019] [Accepted: 08/31/2019] [Indexed: 11/21/2022] Open
Abstract
Radical mandible resection causes significant functional and cosmetic impairment. Nonvascularized bone reconstruction and oral rehabilitation using fixed prosthesis with dental implants enabled recovery of appearance and mastication function.
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Affiliation(s)
- Toshiyuki Kataoka
- Department of Oral and Maxillofacial SurgerySchool of medicineTokyo Women's Medical UniversityTokyoJapan
| | - Yuichi Akagi
- Department of Oral and Maxillofacial SurgerySchool of medicineTokyo Women's Medical UniversityTokyoJapan
| | - Chie Kagawa
- Department of Oral and Maxillofacial SurgerySchool of medicineTokyo Women's Medical UniversityTokyoJapan
| | - Ryo Sasaki
- Department of Oral and Maxillofacial SurgerySchool of medicineTokyo Women's Medical UniversityTokyoJapan
| | - Toshihiro Okamoto
- Department of Oral and Maxillofacial SurgerySchool of medicineTokyo Women's Medical UniversityTokyoJapan
| | - Tomohiro Ando
- Department of Oral and Maxillofacial SurgerySchool of medicineTokyo Women's Medical UniversityTokyoJapan
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12
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Yan Q, Wu X, Su M, Hua F, Shi B. Short implants (≤6 mm) versus longer implants with sinus floor elevation in atrophic posterior maxilla: a systematic review and meta-analysis. BMJ Open 2019; 9:e029826. [PMID: 31662363 PMCID: PMC6830603 DOI: 10.1136/bmjopen-2019-029826] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 09/06/2019] [Accepted: 09/26/2019] [Indexed: 12/13/2022] Open
Abstract
OBJECTIVES To compare the use of short implants (≤6 mm) in atrophic posterior maxilla versus longer implants (≥10 mm) with sinus floor elevation. DESIGN A systematic review and meta-analysis based on randomised controlled trials (RCTs). DATA SOURCES Electronic searches were conducted in PubMed, Embase and the Cochrane CENTRAL. Retrospective and prospective hand searches were also performed. ELIGIBILITY CRITERIA RCTs comparing short implants (≤6 mm) and longer implants (≥10 mm) with sinus floor elevation were included. Outcome measures included implant survival (primary outcome), marginal bone loss (MBL), complications and patient satisfaction. DATA EXTRACTION AND SYNTHESIS Risks of bias in and across studies were evaluated. Meta-analysis, subgroup analysis and sensitivity analysis were undertaken. Quality of evidence was assessed according to Grading of Recommendations Assessment, Development and Evaluation. RESULTS A total of seven RCTs involving 310 participants were included. No significant difference in survival rate was found for 1-3 years follow-up (RR 1.01, 95% CI 0.97 to 1.04, p=0.74, I²=0%, moderate-quality evidence) or for 3 years or longer follow-up (RR 1.00, 95% CI 0.97 to 1.04, p=0.79, I²=0%, moderate-quality evidence). However, short implants (≤6 mm) showed significantly less MBL in 1-3 years follow-up (MD=-0.13 mm, 95% CI -0.21 to 0.05; p=0.001, I²=87%, low-quality evidence) and in 3 years or longer follow-up (MD=-0.25 mm, 95% CI -0.40 to 0.10; p=0.001, I²=0%, moderate-quality evidence). In addition, short implant (≤6 mm) resulted in fewer postsurgery reaction (RR 0.11, 95% CI 0.14 to 0.31, p<0.001, I²=40%, moderate-quality evidence) and sinus perforation or infection (RR 0.11, 95% CI 0.02 to 0.63, p=0.01, I²=0%, moderate-quality evidence). CONCLUSIONS For atrophic posterior maxilla, short implants (≤6 mm) are a promising alternative to sinus floor elevation, with comparable survival rate, less MBL and postsurgery reactions. Additional high-quality studies are needed to evaluate the long-term effectiveness of short implants (≤6 mm). TRIAL REGISTERATION NUMBER The protocol has been registered at PROSPERO (CRD42018103531).
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Affiliation(s)
- Qi Yan
- Hubei-MOST KLOS & KLOBM, School & Hospital of Stomatology, Wuhan University, Wuhan, China
- Department of Oral Implantology, School & Hospital of Stomatology, Wuhan University, Wuhan, China
| | - Xinyu Wu
- Hubei-MOST KLOS & KLOBM, School & Hospital of Stomatology, Wuhan University, Wuhan, China
- Department of Oral Implantology, School & Hospital of Stomatology, Wuhan University, Wuhan, China
| | - Meiying Su
- Department of Oral Implantology, School & Hospital of Stomatology, Wuhan University, Wuhan, China
| | - Fang Hua
- Centre for Evidence-Based Stomatology, School & Hospital of Stomatology, Wuhan University, Wuhan, China
- Cochrane Oral Health, Division of Dentistry, The University of Manchester, Manchester, UK
| | - Bin Shi
- Department of Oral Implantology, School & Hospital of Stomatology, Wuhan University, Wuhan, China
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Abstract
OBJECTIVE To determine the evidence on the adverse effects of placing dental implants in healthy growing children. STUDY DESIGN A systematic search was conducted in five electronic databases: PubMed, Ovid, Cochrane, EBSCO host, ProQuest. Studies on implants placed in children below the age of 19 years, with loss of tooth either due to trauma or caries were included, whereas, studies on mini implants and implants placed due to congenital absence of teeth were excluded. The articles that fulfilled the inclusion criteria were analyzed based on the predetermined criteria of success. RESULTS A total of 8 publications fulfilled the inclusion criteria. All the included articles were case reports/series, involving a total of 16 implants (15 maxillary, one mandibular) in 11 adolescents (7 boys and 4 girls). The age of implant placement ranged between ten to 17 years with a mean age of 13.4 years and the follow up period, 4.5 months to 13 years. Pain, paresthesia, mobility or peri-implant radiolucency was not reported in any case report, indicating good integration. Radiographic crestal bone loss, probing depth and implant esthetics were not mentioned. The infraocclusion was not reported in 5 cases (age: 11-17 years, follow up: 4.5 months-two years), however, it was an adverse effect in 6 cases (age: ten-17 years, follow up: three-13 years). CONCLUSION There is insufficient evidence to contradict the placement of dental implants in healthy growing children; the only reported adverse event is infraocclusion, the management of which too is discussed. However, as all the data is from case reports, the result should be interpreted with caution. Therefore, well-designed randomized controlled trials are needed to address this gap in the literature.
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14
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Pérez León P, Bartolomé JF, Lombardía C, Pradíes G. Mechanical fatigue behaviour of different lengths screw-retained restorations connected to two designs prosthetic connection level. J Oral Rehabil 2019; 46:747-755. [PMID: 31050014 DOI: 10.1111/joor.12809] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 03/27/2019] [Accepted: 04/25/2019] [Indexed: 11/29/2022]
Abstract
The aim of this work is to compare the mechanical fatigue behaviour of different crown heights of single crown implant restorations made over two different internal hexagonal titanium dental implant connection levels. Two different groups of internal hexagonal connection were studied: (a) TL group (N = 26) included implants with a transmucosal connection (12.2 mm height and 4.8 mm width) and (b) BL group (N = 26) composed by implants at a bone level connection (10 mm height and 3.8 mm width). Two subgroups (N = 13) were established for each connection level according to crown heights (TL10 = 10 mm, TL15 = 15 mm, BL12 = 12 mm, BL17 = 17 mm). Dynamic load tests were carried out according to ISO Norm 14801. Failed samples and fracture surfaces were analysed with an optical and scanning electron microscope (SEM). The fatigue limit and the fatigue strength degradation (fatigue strength exponent) decreases with increasing crown height (5 mm) in both groups of internal hexagonal titanium dental implant connection levels. Consequently, the mechanical integrity of internal hexagonal dental implants varies with the height of the crown. An increase of 5 millimetres in the crown height appears to significantly decrease the fatigue life of both types of dental implants.
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Affiliation(s)
- Patricia Pérez León
- Department of Buccofacial Prosthesis, Faculty of Dentistry, Complutense University of Madrid, Madrid, Spain
| | - José F Bartolomé
- Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas (CSIC), Madrid, Spain
| | - Carlos Lombardía
- Department of Buccofacial Prosthesis, Faculty of Dentistry, Complutense University of Madrid, Madrid, Spain
| | - Guillermo Pradíes
- Department of Buccofacial Prosthesis, Faculty of Dentistry, Complutense University of Madrid, Madrid, Spain
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15
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Meijer HJA, Boven C, Delli K, Raghoebar GM. Is there an effect of crown-to-implant ratio on implant treatment outcomes? A systematic review. Clin Oral Implants Res 2019; 29 Suppl 18:243-252. [PMID: 30306696 PMCID: PMC6221159 DOI: 10.1111/clr.13338] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/05/2018] [Indexed: 11/28/2022]
Abstract
OBJECTIVES High crown-to-implant ratios may lead to complications due to unfavorable occlusal forces, including nonaxial forces, on the bone surrounding the neck of the implant and within the connection of the crown and implant itself. The aim of this study was to perform a systematic review on the influence of crown-to-implant ratio of single-tooth, nonsplinted, implants on biological and technical complications. MATERIALS AND METHODS MEDLINE (1950-January 2018), EMBASE (1966-January 2018), and Cochrane Central Register of Controlled Trials database (1800-January 2018) were searched to identify eligible studies. Inclusion criteria were as follows: crown-to-implant ratio of single-tooth, nonsplinted, implant-supported restorations in the posterior maxilla or mandible and follow-up of at least 1 year. Main outcome measures were as follows: implant survival rate, marginal bone level changes, biological complications, and technical complications. Two reviewers independently assessed the articles. A meta-analysis was carried out for implant survival rate and peri-implant bone changes. RESULTS Of 154 primarily selected articles, eight studies fulfilled the inclusion criteria. Study groups presented a mean crown-to-implant ratio varying from 0.86 (with 10-mm implants) to 2.14 (with 6-mm implants). The meta-analysis showed an implant survival of more than 99% per year and mean peri-implant bone changes of <0.1 mm per year. Limited biological and technical complications were reported. CONCLUSION Data reviewed in the current manuscript on crown-to-implant ratio, ranging from 0.86 to 2.14, of single-tooth, nonsplinted, implants did not demonstrate a high occurrence of biological or technical complications.
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Affiliation(s)
- Henny J A Meijer
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.,Department of Implant Dentistry, Dental School, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Carina Boven
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Konstantina Delli
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Gerry M Raghoebar
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
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16
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Thoma DS, Haas R, Sporniak‐Tutak K, Garcia A, Taylor TD, Hämmerle CHF. Randomized controlled multicentre study comparing short dental implants (6 mm) versus longer dental implants (11–15 mm) in combination with sinus floor elevation procedures: 5‐Year data. J Clin Periodontol 2018; 45:1465-1474. [DOI: 10.1111/jcpe.13025] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Revised: 09/04/2018] [Accepted: 10/15/2018] [Indexed: 02/01/2023]
Affiliation(s)
- Daniel S. Thoma
- Clinic of Fixed and Removable Prosthodontics and Dental Material ScienceCenter of Dental MedicineUniversity of Zurich Zurich Switzerland
| | - Robert Haas
- Akademie für Orale ImplantologiePrivate Practice Vienna Austria
| | | | - Abel Garcia
- University of Santiago de Compostela Santiago de Compostela Spain
| | | | - Christoph H. F. Hämmerle
- Clinic of Fixed and Removable Prosthodontics and Dental Material ScienceCenter of Dental MedicineUniversity of Zurich Zurich Switzerland
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17
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The Influence of the Crown-Implant Ratio on the Crestal Bone Level and Implant Secondary Stability: 36-Month Clinical Study. BIOMED RESEARCH INTERNATIONAL 2018; 2018:4246874. [PMID: 29862269 PMCID: PMC5976988 DOI: 10.1155/2018/4246874] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/21/2018] [Accepted: 04/04/2018] [Indexed: 11/17/2022]
Abstract
Introduction When the era of dental implantology began, the pioneers defined some gold standards used in dental prosthetics treatment for implant-supported restorations. Referring to traditional prosthetics, it was taken for granted that the length of an implant placed in the alveolar bone (the equivalent of the root) should exceed the length of the superstructure. Aim of the Study The aim of the study was to determine whether implant length and the crown-to-implant (C/I) ratio influence implant stability and the loss of the surrounding marginal bone and whether short implants can be used instead of sinus augmentation procedures. Material and Methods The patients participating in the study (n = 30) had one single tooth implant, a short (OsseoSpeed™ L6 Ø4 mm, Implants) or a regular implant (OsseoSpeed L11 and L13 Ø4 mm, DENTSPLY Implants), placed in the maxilla. The evaluation was based on clinical and radiological examination. The crown-to-implant ratio was determined by dividing the length of the crown together with the abutment by the length of the implant placed crestally. Mean crown-to-implant ratios were calculated separately for each group and its correlation with the MBL (marginal bone loss) and stability was assessed. The authors compared the correlation between the C/I ratio values, MBL, and secondary implant stability. Results Positive results in terms of primary and secondary stability were achieved with both (short and conventional) implants. The MBL was low for short and conventional implants being 0.34 ± 0.24 mm and 0.22 ± 0.46 mm, respectively. No significant correlation was found between the C/I ratio and secondary stability as well as the C/I ratio and the marginal bone loss. Conclusions Short implants can be successfully used to support single crowns. The study has revealed no significant differences in the clinical performance of prosthetic restorations supported by short implants. Clinical trial registration number is NCT03471000.
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18
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Naenni N, Sahrmann P, Schmidlin P, Attin T, Wiedemeier D, Sapata V, Hämmerle C, Jung R. Five-Year Survival of Short Single-Tooth Implants (6 mm): A Randomized Controlled Clinical Trial. J Dent Res 2018. [DOI: 10.1177/0022034518758036] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The aim of the present study was to evaluate whether 6-mm dental implants in the posterior segments of either jaw perform equally well in terms of clinical and radiographic outcomes when compared with 10-mm implants after 5 y of loading. Patients with single-tooth gaps in the posterior area who were scheduled for implant therapy were randomly assigned to a group receiving either a 6- or 10-mm implant. After a healing period of 10 wk, implants were loaded with a screw-retained single crown and followed up at yearly intervals. Of 96 patients, 86 could be recalled after 5 y. The implant survival rates amounted to 91% (95% confidence interval: 0.836 to 0.998) for the 6-mm group and 100% for the 10-mm group ( P = 0.036). Median crown-to-implant (C/I) ratios were 1.75 (interquartile range [IQR], 1.50 to 1.90) for the 6-mm group and 1.04 (IQR, 0.95 to 1.15) for the 10-mm group, whereas the median marginal bone levels measured −0.29 mm (IQR, −0.92 to 0.23) for the 6-mm group and −0.15 mm (IQR: −0.93 – 0.41) for the 10-mm group after 5 y. The C/I ratio turned out to be statistically significant ( P < 0.001), whereas marginal bone levels showed no significant difference between the groups. The 6-mm implants exhibited significantly lower survival rates than the 10-mm implants over 5 y, whereas there was no difference between upper and lower jaws in terms of survival ( P = 0.58). Lost implants did not show any sign of marginal bone loss or peri-implant infection previous to loss of osseointegration. High C/I ratio and implant length had no significant effect on marginal bone level changes or technical and biological complications (German Clinical Trials Registry: DRKS00006290).
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Affiliation(s)
- N. Naenni
- Clinic of Fixed and Removable Prosthodontics and Dental Material Science, University of Zurich, Zurich, Switzerland
| | - P. Sahrmann
- Clinic of Preventive Dentistry, Periodontology and Cariology, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
| | - P.R. Schmidlin
- Clinic of Preventive Dentistry, Periodontology and Cariology, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
| | - T. Attin
- Clinic of Preventive Dentistry, Periodontology and Cariology, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
| | - D.B. Wiedemeier
- Statistical Services, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
| | - V. Sapata
- Clinic of Fixed and Removable Prosthodontics and Dental Material Science, University of Zurich, Zurich, Switzerland
| | - C.H.F. Hämmerle
- Clinic of Fixed and Removable Prosthodontics and Dental Material Science, University of Zurich, Zurich, Switzerland
| | - R.E. Jung
- Clinic of Fixed and Removable Prosthodontics and Dental Material Science, University of Zurich, Zurich, Switzerland
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19
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Lee D, Park S, Noh WC, Im JS, Kim C. Photoacoustic imaging of dental implants in a porcine jawbone ex vivo. OPTICS LETTERS 2017; 42:1760-1763. [PMID: 28454154 DOI: 10.1364/ol.42.001760] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Currently, x-ray-based imaging is used before and after the dental implant treatment, but the ionizing radiation is potentially harmful to patients and operators. Here, we demonstrate ex vivo photoacoustic imaging of a dental implant embedded in a porcine jawbone. By layering biological tissue over the jawbone to mimic a clinical environment, we demonstrate 10 mm deep imaging. Our results show that photoacoustic imaging can provide jawbone anatomical information, the location of an embedded implant fixture, and the thickness of the soft tissue above the jawbone.
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20
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Koller CD, Pereira-Cenci T, Boscato N. Parameters Associated with Marginal Bone Loss around Implant after Prosthetic Loading. Braz Dent J 2017; 27:292-7. [PMID: 27224562 DOI: 10.1590/0103-6440201600874] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Accepted: 04/19/2016] [Indexed: 12/29/2022] Open
Abstract
This study evaluated retrospectively the association among occlusal, periodontal and implant-prosthetic parameters and marginal bone loss (MBL) around implants and survival rate at 5.7 ±3.2 years of follow-up after prosthetic loading. Eighty-two patients received 164 external hexagon implants. After the standard healing period (3 to 6 months), the implants were restored with single-tooth or up to three splinted crowns. All patients were followed according to a strict maintenance program with regular recalls and clinically evaluated by a calibrated examiner. The MBL measurements taken from standardized radiographs made at permanent crown placement (baseline) and after the last evaluation were calculated considering occlusal, periodontal and implant-prosthetic parameters. Veneer fractures and abutment loosening were not considered failure. Two implants failed during the follow-up period, resulting in a survival rate of 98.8%. Cox regression analyses showed MBL associated with non-working side contacts (p=0.047), inadequate anterior guidance (p=0.001), lateral group guidance involving teeth and implants (p=0.015), periimplant plaque index (p=0.035), prosthetic design (p=0.030) and retention (p=0.006). Inadequate occlusal pattern guide, presence of visible plaque, and cemented and splinted implant-supported restoration were associated with greater MBL around the implant.
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Affiliation(s)
- Clarissa D Koller
- Graduate Program in Dentistry, Dental School, UFPel - Universidade Federal de Pelotas, Pelotas, RS, Brazil, Universidade Federal de Pelotas, Graduate Program in Dentistry, Dental School, Universidade Federal de Pelotas, Pelotas RS , Brazil
| | - Tatiana Pereira-Cenci
- Graduate Program in Dentistry, Dental School, UFPel - Universidade Federal de Pelotas, Pelotas, RS, Brazil, Universidade Federal de Pelotas, Graduate Program in Dentistry, Dental School, Universidade Federal de Pelotas, Pelotas RS , Brazil
| | - Noéli Boscato
- Graduate Program in Dentistry, Dental School, UFPel - Universidade Federal de Pelotas, Pelotas, RS, Brazil, Universidade Federal de Pelotas, Graduate Program in Dentistry, Dental School, Universidade Federal de Pelotas, Pelotas RS , Brazil
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21
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Rossi F, Lang NP, Ricci E, Ferraioli L, Marchetti C, Botticelli D. 6-mm-long implants loaded with fiber-reinforced composite resin-bonded fixed prostheses (FRCRBFDPs). A 5-year prospective study. Clin Oral Implants Res 2017; 28:1478-1483. [DOI: 10.1111/clr.13015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/18/2017] [Indexed: 11/28/2022]
Affiliation(s)
- Fabio Rossi
- Unit Scholar; Department of Biomedical and Neuromotorial Science; University of Bologna; Bologna Italy
- ARDEC Academy; Ariminum Odontologica; Rimini Italy
| | - Niklaus P. Lang
- Center for Dental Medicine; University of Zurich; Zurich Switzerland
- University of Bern; Bern Switzerland
| | - Emanuele Ricci
- Unit Scholar; Department of Biomedical and Neuromotorial Science; University of Bologna; Bologna Italy
| | - Lorenzo Ferraioli
- Unit Scholar; Department of Biomedical and Neuromotorial Science; University of Bologna; Bologna Italy
| | - Claudio Marchetti
- Department of Biomedical and Neuromotorial Science; University of Bologna; Bologna Italy
| | - Daniele Botticelli
- ARDEC Academy; Ariminum Odontologica; Rimini Italy
- POI - Programa Odontológico Internacional; Cartagena de Indias Colombia
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22
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YILDIZ DOMANİÇ K, KAHRAMANOĞLU E, KULAK ÖZKAN Y. Bruksizm ve İmplant Başarısı: Literatür Derleme. CUMHURIYET DENTAL JOURNAL 2016. [DOI: 10.7126/cdj.58140.5000091620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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23
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The Effect of Crown-to-Implant Ratio on the Clinical Performance of Extra-Short Locking-Taper Implants. J Craniofac Surg 2016; 27:675-81. [DOI: 10.1097/scs.0000000000002562] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
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24
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Technical and biological complications related to crown to implant ratio: a systematic review. IMPLANT DENT 2016; 23:180-7. [PMID: 24637523 DOI: 10.1097/id.0000000000000026] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
AIM To review the occurrence of prosthetic failure and biological complications with respect to the crown to implant (C/I) ratio. METHODS Accurate search was made on the subject C/I ratio with the following criteria: (1) studies on humans with data on prosthetic failure and/or biological complications related to C/I ratio; (2) partial edentulous patients; (3) randomized clinical trials, prospective, longitudinal, retrospective, and multicenter studies with a minimum of 48 months mean follow-up; (4) language: English; (5) radiographic measurements by peri-apical x-ray; (6) implant material: titanium; and (7) no implant type selection was applied. RESULTS Six articles were considered eligible for full-text analysis. Unfavorable C/I ratio can be considered a potential risk factor for single crown and abutment loosening (C/I ratio ≥ 1.46) and abutment fractures in posterior areas (C/I ratio ≥ 2.01). CONCLUSIONS Despite the limited data, high C/I ratio may be related to some prosthetic failures. Unfavorable C/I ratio does not affect biological complications and implant failure.
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25
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Chrcanovic BR, Kisch J, Albrektsson T, Wennerberg A. Bruxism and dental implant treatment complications: a retrospective comparative study of 98 bruxer patients and a matched group. Clin Oral Implants Res 2016; 28:e1-e9. [PMID: 27009853 DOI: 10.1111/clr.12844] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/06/2016] [Indexed: 11/29/2022]
Abstract
OBJECTIVES To analyze the complications of dental implant treatment in a group of patients with bruxism in comparison with a matched group of non-bruxers. MATERIAL AND METHODS Patients being diagnosed as bruxers were identified within a group of patients consecutively treated with implant-supported prostheses at one specialist clinic, based on the most recent listed sign and symptoms of bruxism according to the International Classification of Sleep Disorders. A diagnostic grading system of "possible," "probable," and "definite" sleep or awake bruxism was used, according to a recent published international consensus. A case-control matching model was used to match the bruxers with a group of non-bruxers, based on five variables. Implant-, prosthetic-, and patient-related data were collected, as well as 14 mechanical complications, and compared between groups. RESULTS Ninety-eight of 2670 patients were identified as bruxers. The odds ratio of implant failure in bruxers in relation to non-bruxers was 2.71 (95% CI 1.25, 5.88). Considering the same number of patients with the same total number of implants equally distributed between groups, the bruxers group had a higher prevalence of mechanical complications in comparison with the non-bruxers group. CONCLUSIONS This study suggests that bruxism may significantly increase both the implant failure rate and the rate of mechanical and technical complications of implant-supported restorations. Other risk factors may also have influenced the results.
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Affiliation(s)
| | - Jenö Kisch
- Clinic for Prosthodontics, Centre of Dental Specialist Care, Malmö, Sweden
| | - Tomas Albrektsson
- Department of Prosthodontics, Faculty of Odontology, Malmö University, Malmö, Sweden.,Department of Biomaterials, Göteborg University, Göteborg, Sweden
| | - Ann Wennerberg
- Department of Prosthodontics, Faculty of Odontology, Malmö University, Malmö, Sweden
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26
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Sahrmann P, Naenni N, Jung RE, Held U, Truninger T, Hämmerle CHF, Attin T, Schmidlin PR. Success of 6-mm Implants with Single-Tooth Restorations: A 3-year Randomized Controlled Clinical Trial. J Dent Res 2016; 95:623-8. [PMID: 26917439 DOI: 10.1177/0022034516633432] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The aim of the study was to test whether implants of 6 mm in length perform equally well as 10-mm implants in terms of survival and marginal bone-level changes when supporting single crowns. Patients with a posterior single-tooth gap were randomly allocated to either the placement of a 6-mm (test) or 10-mm implant (control). The treatment protocol allowed for internal sinus lift but not for lateral bone augmentation. After a healing period of 10 wk, implants were loaded with screw-retained single crowns. Survival rates, number of pockets ≥5 mm, and bleeding-on-probing were assessed clinically. The change of marginal bone level and crown-to-implant ratios were analyzed by 2 examiners. Longitudinal intragroup analyses for marginal bone levels were performed applying the Wilcoxon signed rank test. Intergroup differences at baseline and at 3 y were compared using the Mann-Whitney U test. The effect of implant length and crown-to-implant ratio on changes of marginal bone level also was determined. Of 94 implants placed (47 test and 47 control), 78 implants (40 test and 38 control) were available for follow-up examination at 3 y of loading. One test implant was lost during the second year. Hence, implant survival was not significantly different between the 2 groups after 3 y (98% test; 100% control). We found no significant change in the crestal bone level from baseline to 3 y for test and control implants with -0.19 ± 0.62 mm and -0.33 ± 0.71 mm, respectively. The intergroup difference was not significant. Crown-to-implant ratios were not associated with a statistically significant difference in marginal bone loss. However, the number of sites with pockets ≥5 mm was significantly higher in the test group. Based on the 3-y assessment, the use of 6-mm implants can be considered a viable option when reconstructing posterior single tooth gaps (German Clinical Trials Registry: DRKS00006290).
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Affiliation(s)
- P Sahrmann
- Clinic of Preventive Dentistry, Periodontology and Cariology, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
| | - N Naenni
- Clinic of Fixed and Removable Prosthodontics and Dental Material Science, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
| | - R E Jung
- Clinic of Fixed and Removable Prosthodontics and Dental Material Science, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
| | - U Held
- Horten Centre for Patient-Oriented Research and Knowledge Transfer, University of Zurich, Zurich, Switzerland
| | - T Truninger
- Clinic of Fixed and Removable Prosthodontics and Dental Material Science, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
| | - C H F Hämmerle
- Clinic of Fixed and Removable Prosthodontics and Dental Material Science, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
| | - T Attin
- Clinic of Preventive Dentistry, Periodontology and Cariology, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
| | - P R Schmidlin
- Clinic of Preventive Dentistry, Periodontology and Cariology, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
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Hasegawa M, Hotta Y, Hoshino T, Ito K, Komatsu S, Saito T. Long-term radiographic evaluation of risk factors related to implant treatment: suggestion for alternative statistical analysis of marginal bone loss. Clin Oral Implants Res 2015; 27:1283-1289. [DOI: 10.1111/clr.12734] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/08/2015] [Indexed: 11/29/2022]
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Comparative Finite Element Analysis of Short Implants and Lateralization of the Inferior Alveolar Nerve With Different Prosthesis Heights. J Craniofac Surg 2015; 26:2342-6. [PMID: 26491923 DOI: 10.1097/scs.0000000000002083] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
The lateralization of the inferior alveolar nerve (LIAN) and short implants are efficient options for rehabilitation of the posterior atrophic mandible. However, the loss of bone leads to prosthesis with greater height and lever effect that in turn can have different impact on treatments. Through the finite element method, the present study tests the hypothesis that conventional implants placed under LIAN and short implants have similar risk of bone loss regarding variable height of the crown and that crown-to-implant ratio is not a reliable resource to evaluate risk in these treatments. Computed tomography scans of mandibles were processed and implants and prosthetic components were reverse engineered for reconstruction of three-dimensional models to simulate 3 elements fixed partial dentures supported by 2 osseointegrated implants. The models of implants were based on MK III implants (Nobel Biocare, Zurich, Switzerland) with 4 mm in diameter by 7 mm in length representing short implants, and 15 mm in length representing implants used in LIAN. The implant/crown ratio for short implants was 1:1.5, 1:2, and 1:2.5 and LIAN models were modeled with exactly the same prosthesis, resulting in implant/crown ratios of 1:0.67, 1:0.89, and 1:1.12. The results partially rejected the hypothesis that LIAN and short implants have similar risk of bone loss, showing that although LIAN results were better in the models evaluated, the variations in height had proportionally similar impact on both treatments and accepted the hypothesis that crown-to-implant ratio was not a reliable resource to evaluate risk.
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Ebler S, Ioannidis A, Jung RE, Hämmerle CHF, Thoma DS. Prospective randomized controlled clinical study comparing two types of two-piece dental implants supporting fixed reconstructions - results at 1 year of loading. Clin Oral Implants Res 2015; 27:1169-77. [DOI: 10.1111/clr.12721] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/18/2015] [Indexed: 11/28/2022]
Affiliation(s)
- Sabine Ebler
- Clinic of Fixed and Removable Prosthodontics and Dental Material Science; Center of Dental Medicine; University of Zurich; Zurich Switzerland
| | - Alexis Ioannidis
- Clinic of Fixed and Removable Prosthodontics and Dental Material Science; Center of Dental Medicine; University of Zurich; Zurich Switzerland
| | - Ronald E. Jung
- Clinic of Fixed and Removable Prosthodontics and Dental Material Science; Center of Dental Medicine; University of Zurich; Zurich Switzerland
| | - Christoph H. F. Hämmerle
- Clinic of Fixed and Removable Prosthodontics and Dental Material Science; Center of Dental Medicine; University of Zurich; Zurich Switzerland
| | - Daniel S. Thoma
- Clinic of Fixed and Removable Prosthodontics and Dental Material Science; Center of Dental Medicine; University of Zurich; Zurich Switzerland
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31
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Ghariani L, Segaan L, Rayyan MM, Galli S, Jimbo R, Ibrahim A. Does crown/implant ratio influence the survival and marginal bone level of short single implants in the mandibular molar? A preliminary investigation consisting of 12 patients. J Oral Rehabil 2015; 43:127-35. [PMID: 26333185 DOI: 10.1111/joor.12342] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/27/2015] [Indexed: 11/28/2022]
Abstract
Crown/implant (C/I) ratio has been proven to not affect the survival of the implants; however, it is also a fact that no evidence exists with regard to the use of single short implants in the mandibular molar. The aim of this study was to determine whether the crown/implant ratios of single implant-supported fixed restorations on implants of 6-8 mm in the mandibular molar have an impact on the implant survival and marginal bone maintenance. Twelve short dental implants (6-8 mm) were installed and restored with single crowns, loaded after 3 months of healing. The restorations were divided according to crown-to-implant ratio into two groups: Group 1: C/I < 2.0 and Group 2: C/I ≧ 2.0. Alveolar bone loss was measured using CBCT scan, taken at the implant placement and after 12 months follow-up from loading. Reduced implant/crown ratio shown no statistic significant differences on implant survival and the alveolar bone level compared with recommended implant/crown ratio. Within the limitation of this study, it can be concluded that reduced C/I ratio could be used as a substitute for recommended C/I ratio in severely mandibular atrophic residual alveolar ridges.
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Affiliation(s)
- L Ghariani
- Department of Oral Surgical Sciences, Faculty of Dentistry, Beirut Arab University, Beirut, Lebanon
| | - L Segaan
- Department of Oral Rehabilitation Sciences, Faculty of Dentistry, Beirut Arab University, Beirut, Lebanon
| | - M M Rayyan
- Department of Oral Surgical Sciences, Faculty of Dentistry, Beirut Arab University, Beirut, Lebanon.,Department of Fixed Prosthodontics, Faculty of dentistry, Misr University for Science and Technology, Giza Governorate, Giza, Egypt
| | - S Galli
- Department of Prosthodontics, Faculty of Odontology, Malmö University, Malmö, Sweden
| | - R Jimbo
- Department of Prosthodontics, Faculty of Odontology, Malmö University, Malmö, Sweden
| | - A Ibrahim
- Public Health Service (Folktandvården), Gefle, Sweden
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Lee JH, Lee JB, Park JI, Choi SH, Kim YT. Mechanical Complication Rates and Optimal Horizontal Distance of the Most Distally Positioned Implant-Supported Single Crowns in the Posterior Region: A Study with a Mean Follow-Up of 3 Years. J Prosthodont 2015; 24:517-524. [DOI: 10.1111/jopr.12306] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/03/2015] [Indexed: 11/30/2022] Open
Affiliation(s)
- Jae-Hong Lee
- Department of Periodontology, National Health Insurance Service; Ilsan Hospital; Goyang Republic of Korea
- Department of Periodontology, Research Institute for Periodontal Regeneration, College of Dentistry; Yonsei University; Seoul Republic of Korea
| | - Jong-Bin Lee
- Department of Periodontology, National Health Insurance Service; Ilsan Hospital; Goyang Republic of Korea
- Department of Periodontology, Research Institute for Periodontal Regeneration, College of Dentistry; Yonsei University; Seoul Republic of Korea
| | - Jung-Im Park
- Department of Periodontology, National Health Insurance Service; Ilsan Hospital; Goyang Republic of Korea
| | - Seong-Ho Choi
- Department of Periodontology, Research Institute for Periodontal Regeneration, College of Dentistry; Yonsei University; Seoul Republic of Korea
| | - Young-Taek Kim
- Department of Periodontology, National Health Insurance Service; Ilsan Hospital; Goyang Republic of Korea
- Department of Periodontology, Research Institute for Periodontal Regeneration, College of Dentistry; Yonsei University; Seoul Republic of Korea
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Solow RA. Channel retention for fixed implant superstructures: A clinical report. J Prosthet Dent 2015; 114:323-7. [PMID: 26025468 DOI: 10.1016/j.prosdent.2015.03.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2014] [Revised: 03/02/2015] [Accepted: 03/02/2015] [Indexed: 10/23/2022]
Abstract
This clinical report describes the treatment of a patient with anatomic and biomechanical problems that made retrievability of an implant-supported prosthesis a design priority. During treatment, the patient was found to be intolerant of local anesthesia, prompting an alternative retrievable design from the screw-retained interim restoration. A channel retention technique for fixed implant superstructures is presented.
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Affiliation(s)
- Roger A Solow
- Visiting faculty, The Pankey Institute, Key Biscayne, Fla; and Private practice, Mill Valley, Calif.
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Lofaj F, Kučera J, Németh D, Kvetková L. Finite element analysis of stress distributions in mono- and bi-cortical dental implants. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 50:85-96. [DOI: 10.1016/j.msec.2015.01.095] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Revised: 12/23/2014] [Accepted: 01/30/2015] [Indexed: 11/15/2022]
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Chrcanovic BR, Albrektsson T, Wennerberg A. Smoking and dental implants: A systematic review and meta-analysis. J Dent 2015; 43:487-98. [PMID: 25778741 DOI: 10.1016/j.jdent.2015.03.003] [Citation(s) in RCA: 192] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Revised: 03/03/2015] [Accepted: 03/05/2015] [Indexed: 11/30/2022] Open
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Monteiro DR, Silva EVF, Pellizzer EP, Filho OM, Goiato MC. Posterior partially edentulous jaws, planning a rehabilitation with dental implants. World J Clin Cases 2015; 3:65-76. [PMID: 25610852 PMCID: PMC4295221 DOI: 10.12998/wjcc.v3.i1.65] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Revised: 07/22/2014] [Accepted: 12/10/2014] [Indexed: 02/05/2023] Open
Abstract
AIM: To discuss important characteristics of the use of dental implants in posterior quadrants and the rehabilitation planning.
METHODS: An electronic search of English articles was conducted on MEDLINE (PubMed) from 1990 up to the period of March 2014. The key terms were dental implants and posterior jaws, dental implants/treatment planning and posterior maxilla, and dental implants/treatment planning and posterior mandible. No exclusion criteria were used for the initial search. Clinical trials, randomized and non randomized studies, classical and comparative studies, multicenter studies, in vitro and in vivo studies, case reports, longitudinal studies and reviews of the literature were included in this review.
RESULTS: One hundred and fifty-two articles met the inclusion criteria of treatment planning of dental implants in posterior jaw and were read in their entirety. The selected articles were categorized with respect to their context on space for restoration, anatomic considerations (bone quantity and density), radiographic techniques, implant selection (number, position, diameter and surface), tilted and pterygoid implants, short implants, occlusal considerations, and success rates of implants placed in the posterior region. The results derived from the review process were described under several different topic headings to give readers a clear overview of the literature. In general, it was observed that the use of dental implants in posterior region requires a careful treatment plan. It is important that the practitioner has knowledge about the theme to evaluate the treatment parameters.
CONCLUSION: The use of implants to restore the posterior arch presents many challenges and requires a detailed treatment planning.
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Ramos Verri F, Santiago Junior JF, de Faria Almeida DA, de Oliveira GBB, de Souza Batista VE, Marques Honório H, Yoshito Noritomi P, Piza Pellizzer E. Biomechanical influence of crown-to-implant ratio on stress distribution over internal hexagon short implant: 3-D finite element analysis with statistical test. J Biomech 2015; 48:138-45. [DOI: 10.1016/j.jbiomech.2014.10.021] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2013] [Revised: 04/09/2014] [Accepted: 10/16/2014] [Indexed: 11/25/2022]
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Schlieve T, Hull W, Miloro M, Kolokythas A. Is immediate reconstruction of the mandible with nonvascularized bone graft following resection of benign pathology a viable treatment option? J Oral Maxillofac Surg 2014; 73:541-9. [PMID: 25683044 DOI: 10.1016/j.joms.2014.10.019] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Revised: 10/08/2014] [Accepted: 10/20/2014] [Indexed: 11/17/2022]
Abstract
PURPOSE The purpose of this study was to address the following clinical question: Is immediate reconstruction of the mandible with a nonvascularized bone graft after resection of benign pathology a viable treatment option? Another purpose was to determine whether any variables affect the success of this treatment approach. MATERIALS AND METHODS The authors implemented a retrospective cohort study from a sample of patients diagnosed with a benign tumor of the mandible who were treated with segmental resection and primary reconstruction with an autogenous nonvascularized bone graft. The predictor variables were age, gender, lesion size, and diagnosis, and the outcome variable was graft success determined by re-establishment of mandibular continuity with sufficient bone for implant placement. The χ(2) test was used for statistical analysis of the categorical data and P values less than .05 were considered statistically significant. RESULTS Twenty patients with benign mandibular tumors were treated with transoral resection and immediate reconstruction with nonvascularized bone grafts. The mean age was 28.3 years (range, 9 to 63 yr) and 55% (11 of 20) were men. The most common lesion type was ameloblastoma (13 of 20) and all patients underwent reconstruction with autogenous anterior iliac crest bone grafting. Ninety percent of patients (18 of 20) had successful reconstruction. Ten patients underwent successful implant placement and restoration. CONCLUSIONS Using careful patient selection, treatment of benign pathology with transoral resection and immediate reconstruction with a nonvascularized bone graft from the anterior iliac crest can be successful. In addition, the total treatment time from implant restoration to return to preoperative function is minimized. Therefore, this method of treatment is a viable treatment option and an alternative to delayed reconstruction or reconstruction with vascularized bone flaps.
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Affiliation(s)
- Thomas Schlieve
- Clinical Assistant Professor, Department of Oral and Maxillofacial Surgery, University of Illinois at Chicago, Chicago, IL.
| | - William Hull
- Chief Resident, Department of Oral and Maxillofacial Surgery, University of Illinois at Chicago, Chicago, IL
| | - Michael Miloro
- Professor and Head, Department of Oral and Maxillofacial Surgery, University of Illinois at Chicago, Chicago, IL
| | - Antonia Kolokythas
- Associate Clinical Professor and Director of Research, Department of Oral and Maxillofacial Surgery, University of Illinois at Chicago, Chicago, IL
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Verri FR, Batista VEDS, Santiago JF, Almeida DADF, Pellizzer EP. Effect of crown-to-implant ratio on peri-implant stress: a finite element analysis. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2014; 45:234-40. [PMID: 25491825 DOI: 10.1016/j.msec.2014.09.005] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2014] [Revised: 08/04/2014] [Accepted: 09/09/2014] [Indexed: 01/13/2023]
Abstract
The aim of this study was to evaluate stress distribution in the fixation screws and bone tissue around implants in single-implant supported prostheses with crowns of different heights (10, 12.5, 15 mm - crown-to-implant ratio 1:1, 1.25:1, 1.5:1, respectively). It was designed using three 3-D models. Each model was developed with a mandibular segment of bone block including an internal hexagon implant supporting a screw-retained, single metal-ceramic crown. The crown height was set at 10, 12.5, and 15 mm with crown-to-implant ratio of 1:1, 1.25:1, 1.5:1, respectively. The applied forces were 200N (axial) and 100 N (oblique). The increase of crown height showed differences with the oblique load in some situations. By von Mises' criterion, a high stress area was concentrated at the implant/fixation screw and abutment/implant interfaces at crown-to-implant ratio of 1:1, 1.25:1, 1.5:1, respectively. Using the maximum principal criteria, the buccal regions showed higher traction stress intensity, whereas the distal regions showed the largest compressive stress in all models. The increase of C/I ratio must be carefully evaluated by the dentist since the increase of this C/I ratio is proportional to the increase of average stress for both screw fixation (C/I 1:1 to 1:1.25 ratio=30.1% and C/I 1:1 to 1:1.5 ratio=46.3%) and bone tissue (C/I 1:1 to 1:1.25 ratio=30% and C/I 1:1 to 1:1.5 ratio=51.5%).
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Affiliation(s)
- Fellippo Ramos Verri
- Department of Dental Materials and Prosthodontics, UNESP, Univ Estadual Paulista, 1193 José Bonifácio Street, Araçatuba, São Paulo 16015050, Brazil.
| | - Victor Eduardo de Souza Batista
- Department of Dental Materials and Prosthodontics, UNESP, Univ Estadual Paulista, 1193 José Bonifácio Street, Araçatuba, São Paulo 16015050, Brazil
| | - Joel Ferreira Santiago
- Department of Dental Materials and Prosthodontics, UNESP, Univ Estadual Paulista, 1193 José Bonifácio Street, Araçatuba, São Paulo 16015050, Brazil
| | - Daniel Augusto de Faria Almeida
- Department of Dental Materials and Prosthodontics, UNESP, Univ Estadual Paulista, 1193 José Bonifácio Street, Araçatuba, São Paulo 16015050, Brazil
| | - Eduardo Piza Pellizzer
- Department of Dental Materials and Prosthodontics, UNESP, Univ Estadual Paulista, 1193 José Bonifácio Street, Araçatuba, São Paulo 16015050, Brazil
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40
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Garaicoa-Pazmiño C, Suárez-López del Amo F, Monje A, Catena A, Ortega-Oller I, Galindo-Moreno P, Wang HL. Influence of Crown/Implant Ratio on Marginal Bone Loss: A Systematic Review. J Periodontol 2014; 85:1214-21. [DOI: 10.1902/jop.2014.130615] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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41
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Nisand D, Renouard F. Short implant in limited bone volume. Periodontol 2000 2014; 66:72-96. [DOI: 10.1111/prd.12053] [Citation(s) in RCA: 86] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/12/2013] [Indexed: 12/28/2022]
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42
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Chrcanovic BR, Albrektsson T, Wennerberg A. Reasons for failures of oral implants. J Oral Rehabil 2014; 41:443-76. [PMID: 24612346 DOI: 10.1111/joor.12157] [Citation(s) in RCA: 239] [Impact Index Per Article: 23.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/08/2014] [Indexed: 12/18/2022]
Abstract
This study reviews the literature regarding the factors contributing to failures of dental implants. An electronic search was undertaken including papers from 2004 onwards. The titles and abstracts from these results were read to identify studies within the selection criteria. All reference lists of the selected studies were then hand-searched, this time without time restrictions. A narrative review discussed some findings from the first two parts where separate data from non-comparative studies may have indicated conclusions different from those possible to draw in the systematic analysis. It may be suggested that the following situations are correlated to increase the implant failure rate: a low insertion torque of implants that are planned to be immediately or early loaded, inexperienced surgeons inserting the implants, implant insertion in the maxilla, implant insertion in the posterior region of the jaws, implants in heavy smokers, implant insertion in bone qualities type III and IV, implant insertion in places with small bone volumes, use of shorter length implants, greater number of implants placed per patient, lack of initial implant stability, use of cylindrical (non-threaded) implants and prosthetic rehabilitation with implant-supported overdentures. Moreover, it may be suggested that the following situations may be correlated with an increase in the implant failure rate: use of the non-submerged technique, immediate loading, implant insertion in fresh extraction sockets, smaller diameter implants. Some recently published studies suggest that modern, moderately rough implants may present with similar results irrespective if placed in maxillas, in smoking patients or using only short implants.
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Affiliation(s)
- B R Chrcanovic
- Department of Prosthodontics, Faculty of Odontology, Malmö University, Malmö, Sweden
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43
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Sun SP, Moon IS, Park KH, Lee DW. Effect of Crown to Implant Ratio and Anatomical Crown Length on Clinical Conditions in a Single Implant: A Retrospective Cohort Study. Clin Implant Dent Relat Res 2013; 17:724-31. [PMID: 24238214 DOI: 10.1111/cid.12175] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
PURPOSE The aim of this retrospective cohort study was to evaluate the long-term influence of the crown-to-implant (C/I) ratio and anatomical crown length on clinical conditions around Astra single dental implants placed in the premolar and molar regions. MATERIALS AND METHODS Seventy-six subjects were selected from patients who had been treated with single Astra implants for replacement of missing premolars and molars. The peri-implant marginal bone level change was assessed 1 year after functional loading and 6 years after functional loading. To predict the peri-implant marginal bone level change using clinical and radiographic data, a multiple linear regression model was applied. The Wilcoxon rank sum test was used to analyze difference median in technical complications. RESULTS The C/I ratio and anatomical crown length were not associated with peri-implant marginal bone loss or changes in the bone level at 6 years (p = .48, p = .31). However, the modified plaque index, modified sulcus bleeding index, and smoking status influenced the peri-implant marginal bone loss (p < .05, r(2) = 0.54). In addition, the patient with technical complication group did show significantly increased anatomical crown length (p < .05) CONCLUSIONS: The higher C/I ratio and anatomical crown length did not increase the risk of peri-implant marginal bone loss during 6 years of functional loading. In addition, higher anatomical crown lengths are associated with higher technical complications.
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Affiliation(s)
- Shan-Pao Sun
- Department of Periodontology, Gangnam Severance Dental Hospital, College of Dentistry, Yonsei University, Seoul, Korea
| | - Ik-Sang Moon
- Department of Periodontology, Gangnam Severance Dental Hospital, College of Dentistry, Yonsei University, Seoul, Korea
| | - Kwang-Ho Park
- Department of Oral & Maxillofacial Surgery, Gangnam Severance Dental Hospital, College of Dentistry, Yonsei University, Seoul, Korea
| | - Dong-Won Lee
- Department of Periodontology, Gangnam Severance Dental Hospital, College of Dentistry, Yonsei University, Seoul, Korea
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Effects of Smoking on Periimplant Health Status and IL-1β, TNF-α, and PGE2 Levels in Periimplant Crevicular Fluid. IMPLANT DENT 2013; 22:519-24. [DOI: 10.1097/id.0b013e31829a1718] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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45
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Hof M, Pommer B, Zukic N, Vasak C, Lorenzoni M, Zechner W. Influence of Prosthetic Parameters on Peri-Implant Bone Resorption in the First Year of Loading: A Multi-Factorial Analysis. Clin Implant Dent Relat Res 2013; 17 Suppl 1:e183-91. [DOI: 10.1111/cid.12153] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Markus Hof
- Department of Oral Surgery; Bernhard Gottlieb University Clinic of Dentistry; Medical University of Vienna; Vienna Austria
| | - Bernhard Pommer
- Department of Oral Surgery; Bernhard Gottlieb University Clinic of Dentistry; Medical University of Vienna; Vienna Austria
| | - Nizama Zukic
- Department of Oral Surgery; Bernhard Gottlieb University Clinic of Dentistry; Medical University of Vienna; Vienna Austria
| | - Christoph Vasak
- Department of Oral Surgery; Bernhard Gottlieb University Clinic of Dentistry; Medical University of Vienna; Vienna Austria
| | - Martin Lorenzoni
- Department of Prosthodontics; University Dental Clinic, Medical University Graz; Graz Austria
| | - Werner Zechner
- Department of Oral Surgery; Bernhard Gottlieb University Clinic of Dentistry; Medical University of Vienna; Vienna Austria
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46
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De Santis D, Cucchi A, Rigoni G, Longhi C. Short Implants with Oxidized Surface in Posterior Areas of Atrophic Jaws: 3- to 5-Year Results of a Multicenter Study. Clin Implant Dent Relat Res 2013; 17:442-52. [DOI: 10.1111/cid.12123] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Daniele De Santis
- Department of Surgery; Section of Dentistry and Maxillofacial Surgery; University of Verona; Verona Italy
| | - Alessandro Cucchi
- Department of Biomedical and Neuromotorial Science; University of Bologna; Bologna Italy
| | - Giovanni Rigoni
- Department of Oral Surgery and Dentistry; University of Milan; Milan Italy
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47
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Anitua E, Piñas L, Orive G. Retrospective Study of Short and Extra-Short Implants Placed in Posterior Regions: Influence of Crown-to-Implant Ratio on Marginal Bone Loss. Clin Implant Dent Relat Res 2013; 17:102-10. [DOI: 10.1111/cid.12073] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- Eduardo Anitua
- Implantology and Oral Rehabilitation; Vitoria Spain
- Biotechnology Institute (BTI); Vitoria Spain
| | - Laura Piñas
- Implantology and Oral Rehabilitation; Vitoria Spain
| | - Gorka Orive
- Biotechnology Institute (BTI); Vitoria Spain
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48
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Yuan JCC, Sukotjo C. Occlusion for implant-supported fixed dental prostheses in partially edentulous patients: a literature review and current concepts. J Periodontal Implant Sci 2013; 43:51-7. [PMID: 23678387 PMCID: PMC3651937 DOI: 10.5051/jpis.2013.43.2.51] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Accepted: 03/22/2013] [Indexed: 11/08/2022] Open
Abstract
Implant treatment has become the treatment of choice to replace missing teeth in partially edentulous areas. Dental implants present different biological and biomechanical characteristics than natural teeth. Occlusion is considered to be one of the most important factors contributing to implant success. Most literature on implant occlusal concepts is based on expert opinion, anecdotal experiences, in vitro and animal studies, and only limited clinical research. Furthermore, scientific literature regarding implant occlusion, particularly in implant-supported fixed dental prostheses remains controversial. In this study, the current status of implant occlusion was reviewed and discussed. Further randomized clinical research to investigate the correlation between implant occlusion, the implant success rate, and its risk factors is warranted to determine best clinical practices.
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Affiliation(s)
- Judy Chia-Chun Yuan
- Department of Restorative Dentistry, University of Illinois at Chicago College of Dentistry, Chicago, IL, USA
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49
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Thoma DS, Sanz Martin I, Benic GI, Roos M, Hämmerle CHF. Prospective randomized controlled clinical study comparing two dental implant systems: demographic and radiographic results at one year of loading. Clin Oral Implants Res 2013; 25:142-9. [DOI: 10.1111/clr.12120] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/22/2012] [Indexed: 11/29/2022]
Affiliation(s)
- Daniel S. Thoma
- Clinic of Fixed and Removable Prosthodontics and Dental Material Science; Center of Dental Medicine; University of Zurich; Zurich Switzerland
| | - Ignacio Sanz Martin
- Section of Periodontology; Faculty of Odontology; University Complutense of Madrid; Madrid Spain
| | - Goran I. Benic
- Clinic of Fixed and Removable Prosthodontics and Dental Material Science; Center of Dental Medicine; University of Zurich; Zurich Switzerland
| | - Malgorzata Roos
- Senior Statistician; Division of Biostatistics; Institute of Social and Preventive Medicine; University of Zurich; Zurich Switzerland
| | - Christoph H. F. Hämmerle
- Clinic of Fixed and Removable Prosthodontics and Dental Material Science; Center of Dental Medicine; University of Zurich; Zurich Switzerland
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Malchiodi L, Cucchi A, Ghensi P, Consonni D, Nocini PF. Influence of crown-implant ratio on implant success rates and crestal bone levels: a 36-month follow-up prospective study. Clin Oral Implants Res 2013; 25:240-51. [DOI: 10.1111/clr.12105] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/18/2012] [Indexed: 11/30/2022]
Affiliation(s)
| | - Alessandro Cucchi
- Department of Biomedical and Neuromotorial Science; University of Bologna; Bologna Italy
| | - Paolo Ghensi
- Department of Oral and Maxillofacial Surgery; University of Milan; Milan Italy
| | - Dario Consonni
- Epidemiology Unit, IRCCS Fundation Ca' Granda Ospedale Maggiore Policlinico; Milan Italy
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