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Nikellis T, Lampraki E, Romeo D, Tsigarida A, Barmak AB, Malamou C, Ercoli C, Papaspyridakos P, Kotsailidi EA, Chochlidakis K. Survival rates, patient satisfaction, and prosthetic complications of implant fixed complete dental prostheses: a 12-month prospective study. J Prosthodont 2023; 32:214-220. [PMID: 35964246 DOI: 10.1111/jopr.13593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Accepted: 08/07/2022] [Indexed: 11/28/2022] Open
Abstract
PURPOSE To determine the survival rate, incidence of prosthetic complications, and patient satisfaction of implant fixed complete dental prostheses (IFCDPs) after a mean observation period of 1.4 years. MATERIALS AND METHODS Twenty-eight (28) eligible participants were recruited according to specific inclusion and exclusion criteria. The definitive metal-acrylic resin IFCDPs consisted of titanium bars veneered with acrylic resin and acrylic denture teeth. Prosthodontic complications, divided into major and minor, were monitored. Parameters such as gender, jaw location, bruxism, and occlusal scheme were evaluated. Moreover, a questionnaire was administered throughout the study to assess patient satisfaction. Poisson regression as well as repeated measures ANOVA were used for statistical analysis. RESULTS Fourteen (14) males and 14 females were enrolled and followed-up at 3, 6, and 12 months. All IFCDPs survived (100% survival rate). The most frequent minor complication was the loss of material used to close the screw access hole (20% out of total complications). The most frequent major complication was chipping of the acrylic denture teeth (77.14% out of total complications). Gender (p = 0.008) and bruxism (p = 0.030) were significant predictors for the total major complications (major wear and major chipping) while occlusal scheme was a significant predictor for major chipping events (p = 0.030). CONCLUSIONS While IFCDPs demonstrated high prosthetic survival rates, they also exhibited a high number of chipping events of the acrylic veneering material, especially in males, bruxers, and individuals with canine guidance occlusion. However, the occurrence of these prosthetic complications did not negatively affect patient satisfaction.
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Affiliation(s)
| | | | - Davide Romeo
- Eastman Institute for Oral Health, University of Rochester, Rochester, NY.,Advanced Oral Surgery Unit, Vita Salute University, San Raffaele Hospital, Milan, Italy
| | - Alexandra Tsigarida
- Department of Periodontology, Eastman Institute for Oral Health, University of Rochester, Rochester, NY
| | - Abdul Basir Barmak
- Eastman Institute for Oral Health, University of Rochester, Rochester, NY
| | | | - Carlo Ercoli
- Department of Periodontology, Eastman Institute for Oral Health, University of Rochester, Rochester, NY
| | - Panos Papaspyridakos
- Department of Periodontology, Eastman Institute for Oral Health, University of Rochester, Rochester, NY.,Department of Prosthodontics, Tufts School of Dental Medicine, Boston, MA
| | - Elli Anna Kotsailidi
- Department of Periodontology, Eastman Institute for Oral Health, University of Rochester, Rochester, NY
| | - Konstantinos Chochlidakis
- Department of Periodontology, Eastman Institute for Oral Health, University of Rochester, Rochester, NY
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Takashima M, Arai Y, Matsuzaki N, Yamazaki Y, Nishiyama H, Nohno K. Masseter muscle cross-sectional area and late implant failure: A case-control study. Clin Implant Dent Relat Res 2023; 25:313-320. [PMID: 36726209 DOI: 10.1111/cid.13189] [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: 10/18/2022] [Revised: 01/22/2023] [Accepted: 01/23/2023] [Indexed: 02/03/2023]
Abstract
INTRODUCTION Occlusal overload is considered to be one of the causes of late implant failure. However, it is unclear whether the magnitude of the patient's occlusal force is a risk factor for late implant failure. PURPOSE This case-control study aimed to clarify the association between the cross-sectional area (CSA) of the masseter muscle and late implant failure. METHODS This case-control study was limited to implant-supported fixed prostheses. We compared cases with at least one late implant failure (n = 25 patients) to controls (n = 82 patients) without implant failure. Patients were matched by age, sex, year of surgery, jaw and tooth type, and bone graft. Log-rank and Cox proportional hazard regression analyses were used to identify possible risk factors for late implant failure. RESULTS The incidence of late implant failure was significantly associated with masseter muscle CSA ≥504.5 mm2 (hazard ratio: 4.43; 95% CI: 1.82-10.79; p < 0.01). CONCLUSION Higher masseter muscle CSA increases the risk of late implant failure.
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Affiliation(s)
- Makiko Takashima
- Oral Implant and Temporomandibular Joint Clinic, Niigata University Medical and Dental Hospital, Niigata, Japan
| | - Yoshiaki Arai
- Oral Implant and Temporomandibular Joint Clinic, Niigata University Medical and Dental Hospital, Niigata, Japan
| | - Nanaka Matsuzaki
- Oral Implant and Temporomandibular Joint Clinic, Niigata University Medical and Dental Hospital, Niigata, Japan
| | - Yuta Yamazaki
- Oral Implant and Temporomandibular Joint Clinic, Niigata University Medical and Dental Hospital, Niigata, Japan
| | - Hideyoshi Nishiyama
- Division of Oral and Maxillofacial Radiology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Kaname Nohno
- Department of Oral Health and Welfare, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
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Yoshino K, Ito K, Kuroda M, Sugihara N. Survival Rate of 3-unit Fixed Partial Dentures Replacing First Molars: A Retrospective Cohort Study. THE BULLETIN OF TOKYO DENTAL COLLEGE 2023; 63:159-165. [PMID: 36384758 DOI: 10.2209/tdcpublication.2022-0009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Fixed partial dentures (FPDs) made of 12% Au-Pd alloy are covered under Japan's national health insurance system. The survival rate of such 3-unit fixed FPDs remains unknown, however. The purpose of this retrospective study was to assess their survival rate in the replacement of first molars. A total of 140 FPDs were included, and the endpoint was removal of an FPD. During the observation period, 43 FPDs were removed. The FPD survival rate was 70.2% at 10 yr, 58.2% at 15 yr, and 42.1% at 20 yr according to the Kaplan-Meier method. The estimated mean survival period was 19.4 yr. The main reasons for FPD loss were dental caries (27.9%), separation from the abutment tooth (18.6%), and pulpitis (18.6%). Single factor analysis using the log-rank test showed that two factors influenced FPD survival: a smaller gonial angle and deep pockets around the abutment teeth. This effect was not statistically significant in either case, however (p>0.05). The present results suggest that the prevention of caries and of the separation of the dentures from the abutment teeth are important factors in the long-term survival of FPDs.
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Affiliation(s)
- Koichi Yoshino
- Department of Epidemiology and Public Health, Tokyo Dental College
| | | | | | - Naoki Sugihara
- Department of Epidemiology and Public Health, Tokyo Dental College
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Yang F, Ruan Y, Liu Y, Chen J, Chen Y, Zhang W, Ding Y, Wang L. Abutment mechanical complications of a Morse taper connection implant system: A 1- to 9-year retrospective study. Clin Implant Dent Relat Res 2022; 24:683-695. [PMID: 35791805 PMCID: PMC9796380 DOI: 10.1111/cid.13115] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 04/29/2022] [Accepted: 05/30/2022] [Indexed: 01/01/2023]
Abstract
BACKGROUND The fracture of a Morse tapered abutment connection in an osseointegrated implant is one of the most serious mechanical complications, and it is extremely hard to deal with this complication in clinical practice. PURPOSE The aim of this study was to explore the cumulative mechanical complications focus on abutment of a platform switching Morse taper connection implant system after loading, and to perform a retrospective, approximately 1- to 9-year follow-up study to identify the predisposing factors. MATERIALS AND METHODS A total of 495 patients with 945 fitted implants were enrolled in this study with a follow-up from January 2012 to January 2020. The data of mechanical complications of the abutment, including abutment fracture (AF) and abutment screw loosening (ASL), and possible causative factors were extracted and evaluated statistically. RESULTS A total of 25 out of 945 (2.65%) cumulative abutment mechanical complications occurred. AF was the most common complication (n = 13, 1.38%), followed by ASL (n = 12, 1.27%). For AF, gender, type of prosthesis, abutment design, and implant diameter were identified as the causative factors. AF was mostly observed in the single crown of males in molar areas, while ASL was more likely to occur on an angled abutment than on a non-angled abutment. Moreover, the abutment with the positioning index (/X) had a higher incidence of fracture than the abutment without the positioning index (C/). CONCLUSIONS This study shows that the Morse taper connection is a safe abutment connection. AF occurs more frequently within single crowns in molar area of males, especially with the positioning index (/X), while ASL is more likely to occur in an angled abutment.
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Affiliation(s)
- Fan Yang
- Center for Plastic & Reconstructive Surgery, Department of StomatologyZhejiang Provincial People's Hospital (Affiliated People's Hospital, Hangzhou Medical College)HangzhouZhejiangChina
| | - Yan Ruan
- Department of StomatologyBengbu Medical CollegeBengbuAnhuiChina
| | - Yunqing Liu
- Department of Restorative Dentistry, Division of Oral Health Science, Graduate School of Dental MedicineHokkaido UniversitySapporoJapan
| | - Jianping Chen
- Center for Plastic & Reconstructive Surgery, Department of StomatologyZhejiang Provincial People's Hospital (Affiliated People's Hospital, Hangzhou Medical College)HangzhouZhejiangChina
| | - Yunfang Chen
- Center for Plastic & Reconstructive Surgery, Department of StomatologyZhejiang Provincial People's Hospital (Affiliated People's Hospital, Hangzhou Medical College)HangzhouZhejiangChina
| | - Wentao Zhang
- Center for Plastic & Reconstructive Surgery, Department of StomatologyZhejiang Provincial People's Hospital (Affiliated People's Hospital, Hangzhou Medical College)HangzhouZhejiangChina
| | - Yude Ding
- Center for Plastic & Reconstructive Surgery, Department of StomatologyZhejiang Provincial People's Hospital (Affiliated People's Hospital, Hangzhou Medical College)HangzhouZhejiangChina
| | - Linhong Wang
- Center for Plastic & Reconstructive Surgery, Department of StomatologyZhejiang Provincial People's Hospital (Affiliated People's Hospital, Hangzhou Medical College)HangzhouZhejiangChina,Department of Restorative Dentistry, Division of Oral Health Science, Graduate School of Dental MedicineHokkaido UniversitySapporoJapan
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Kikuchi T, Wada M, Mameno T, Hasegawa D, Serino G, Ikebe K. Longitudinal study on the effect of keratinized mucosal augmentation surrounding dental implants in preventing peri-implant bone loss. PeerJ 2022; 10:e13598. [PMID: 35782095 PMCID: PMC9248778 DOI: 10.7717/peerj.13598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Accepted: 05/25/2022] [Indexed: 01/17/2023] Open
Abstract
Background Dental implant therapy is a well-established method of prosthetic rehabilitation of missing teeth. To maintain the health of the surrounding tissue, management of risk factors/indicators and daily maintenance are important. It still remains controversial whether a certain amount of keratinized mucosal width is essential for maintaining the health of peri-implant tissue. The purpose of this multicenter retrospective study was to assess the correlation between bone loss around dental implant and the amount of keratinized tissue width. Methods A total of 1,644 implants were evaluated. Data was collected about participants' general and dental history, as well as implant details. Bone resorption around implant was calculated from intra-oral radiographs taken after 1 year and more than 3 years of function. Implants were classified into three groups; received free gingival graft or apically repositioned flap surgery for increasing the keratinized mucosa ≥2 mm width (group A), keratinized mucosa width ≥2 mm (group B), and keratinized mucosa width <2 mm (group C). These data were analyzed by propensity score analysis and a generalized linear regression analysis was performed to compare the bone resorption among groups. Results Mean functional time was 55.8 months (SD = 20.5) in group A, 67.6 months (SD = 28.1) in group B, and 74.5 months (SD = 32.9) in group C. Mean bone resorption of groups A, B, and C were 0.08 mm (SD = 0.40), 0.18 mm (SD = 0.66), and 0.44 mm (SD = 0.40). Groups A and B had significantly lower bone resorption than group C. Conclusion The results in this study show the importance of keratinized mucosa in maintaining the peri-implant bone. Our findings also suggest that mucosal transplantation is useful, as opposed to narrowing of the keratinized mucosa.
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Affiliation(s)
- Takeshi Kikuchi
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya City, Aichi, Japan
| | - Masahiro Wada
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Suita, Osaka, Japan
| | - Tomoaki Mameno
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Suita, Osaka, Japan
| | - Daisuke Hasegawa
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Suita, Osaka, Japan
| | - Giovanni Serino
- Department of Periodontology, Södra Älvsborg Hospital, Brämhultsvägen, Borås, Sweden
| | - Kazunori Ikebe
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Suita, Osaka, Japan
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Wada M, Mameno T, Kani M, Miwa S, Ikebe K. Association between gonial angle on orthopantomogram and reline frequency in removable partial denture wearers. J Prosthodont Res 2021; 66:83-86. [PMID: 34108296 DOI: 10.2186/jpr.jpr_d_20_00153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
PURPOSE Removable dentures are a reasonable option for prosthetic treatment. However, continuous residual ridge resorption and reline procedures are inevitable owing to the strong pressure exerted on the mucosa or inappropriate pressure distribution. This study aimed to elucidate the association between the gonial angle on orthopantomogram (GAO) with occlusal force and reline frequency in removable partial denture wearers. METHODS Participants were patients who had previously received removable partial denture treatment for a free-end defect. Age, sex, number of remaining teeth, remaining opposing teeth, and occlusal support were investigated. GAO was measured using panoramic radiographs. The mean relining interval was calculated as the mean number of days between denture insertion and the first relining or subsequent relining. The association between the mean relining interval and each factor was investigated. RESULTS Sixty-five subjects (33 females) were analyzed. The median value of the mean relining interval was 533.3 days, and the median GAO was 123º. There was a significant positive correlation between the mean relining interval and GAO (rs = 0.335). The number of remaining opposing teeth and occlusal support exhibited weak negative correlations with mean relining interval (rs = -0.187 and -0.214, respectively). Multivariate analysis using a generalized linear model showed that GAO was a significant explanatory variable for the m ean relining interval. CONCLUSIONS Within the limitations of this study, GAO was found GAO was found to contribute to the increased frequency of relining due to ridge resorption in patients with a small GAO.
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Affiliation(s)
- Masahiro Wada
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka
| | - Tomoaki Mameno
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka
| | - Misako Kani
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka
| | - Shunta Miwa
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka
| | - Kazunori Ikebe
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka
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Lee SKY, Salinas TJ, Wiens JP. The Effect of Patient Specific Factors on Occlusal Forces Generated: Best Evidence Consensus Statement. J Prosthodont 2021; 30:52-60. [PMID: 33474770 DOI: 10.1111/jopr.13334] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
PURPOSE The purpose of this Best Evidence Consensus Statement was to search the literature to determine if there is a relationship between patient specific factors and occlusal force. MATERIALS AND METHODS A literature review was conducted in the following databases: Evidence-Based Medicine Reviews (EBMR), Cochrane Database of Systematic Reviews, Embase, and Ovid MEDLINE(R) and Epub Ahead of Print. Articles on patient factors and occlusal force were compiled by using a combination of the key words: "bite force," "occlusal force," "partial and complete edentulism," "bruxism," and "orthognathic class." Inclusion criteria included meta-analyses, systematic reviews, randomized controlled trials, case series, and journal articles. Exclusion criteria were case reports, studies in children, animals, and bench studies. RESULTS Of the 1502 articles that met the initial search criteria, 97 related to patient-specific factors affecting occlusal forces. These articles were evaluated, rated, and organized into appropriate categories addressing questions of foci. CONCLUSIONS The range of occlusal force is highly variable among subjects correlated to patient specific factors such as age, gender, partial and complete edentulism, the presence of a maxillofacial defect, location of edentulous area, orthognathic profile, and magnitude of occlusal vertical dimension. Tooth replacement therapies targeted at increasing occlusal contact seem to have a positive effect on increasing occlusal force. Bruxism does not necessarily demonstrate higher occlusal powering but may have greater tooth contact time. Occlusal force is not clearly affected by the type of dental restoration or restorative material used. The clinical significance of the changes in occlusal forces is yet to be determined.
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Affiliation(s)
| | | | - Jonathan P Wiens
- Department of Restorative Dentistry, University of Detroit Mercy School of Dentistry, Detroit, MI
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Kochi I, Takei E, Maeda R, Ito K, Magara J, Tsujimura T, Kulvanich S, Inoue M. Changes of bolus properties and the triggering of swallowing in healthy humans. J Oral Rehabil 2021; 48:592-600. [PMID: 33481324 DOI: 10.1111/joor.13151] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Accepted: 01/14/2021] [Indexed: 11/26/2022]
Abstract
There is wide variation in chewing behaviours, even among healthy humans. Further, the way in which humans determine swallowing initiation when chewing solid foods remains unclear. The current study sought to investigate how the bolus properties change over time during chewing, and to clarify which factors affect chewing and swallowing behaviours, including swallowing initiation, in healthy humans. Twenty-four healthy volunteers were instructed to chew 8 g of steamed rice and spit it out at 50%, 100% and 150% of their own chewing duration, defined as the time of chewing from onset of the first chewing cycle to onset of the first swallow. Chewing and swallowing behaviours were monitored and determined by visual inspection of video recordings. The physical properties such as hardness, cohesiveness and adhesiveness as well as water content of the bolus were measured. In each subject, maximum bite force, tongue pressure and stimulated salivary flow rate were also measured. Hardness gradually decreased, and the cohesiveness and water content of the bolus did not change up to 50% of chewing duration, followed by a slight but significant increase. The adhesiveness of the bolus rapidly decreased at the beginning of chewing. Chewing duration was significantly related to stimulated salivary flow rate; greater salivary flow rate was associated with shorter chewing duration. Variation of chewing duration and swallowing initiation was not dependent on bolus properties during the chewing of steamed rice, but mainly depended on the surface lubrication of the bolus.
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Affiliation(s)
- Izumi Kochi
- Division of Dysphagia Rehabilitation, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Eri Takei
- Division of Dysphagia Rehabilitation, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Rumiko Maeda
- Division of Dysphagia Rehabilitation, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.,Department of Rehabilitation, Faculty of Health Science, Kansai University of Welfare Sciences, Osaka, Japan
| | - Kayoko Ito
- Oral Rehabilitation, Niigata University Medical and Dental Hospital, Niigata, Japan
| | - Jin Magara
- Division of Dysphagia Rehabilitation, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Takanori Tsujimura
- Division of Dysphagia Rehabilitation, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Sirima Kulvanich
- Division of Dysphagia Rehabilitation, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Makoto Inoue
- Division of Dysphagia Rehabilitation, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
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Murakami H, Igarashi K, Fuse M, Kitagawa T, Igarashi M, Uchibori S, Komine C, Gotouda H, Okada H, Kawai Y. Risk factors for abutment and implant fracture after loading. J Oral Sci 2020; 63:92-97. [PMID: 33311012 DOI: 10.2334/josnusd.20-0443] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
PURPOSE Implant component fractures are one of the most serious complications in implant treatment. With a better understanding of the risk factors for fracture in the preoperative, surgery, superstructure, and post-loading phases of implant treatment, low-risk treatment could reduce implant component fractures, leading to a better prognosis. The aim of this study was to clarify the risk factors for abutment and implant fractures that occur after loading, and to perform a retrospective, approximately 10-year follow-up study to explore the risk factors in each treatment phase. METHODS Subjects were fitted with an implant prosthesis between January 2008 and December 2009. In total, 1,126 Ankylos implants in 430 patients were included for analysis. Binary logistic regression analysis was performed to extract factors related to non-fracture and fracture of the abutment or implant as a dependent variable. RESULTS Gender (OR = 3.466, 95% CI 1.296-9.268, P = 0.013), gonial angle (OR = 3.420, 95% CI 1.308-8.945, P = 0.012), and splinting status of the superstructure (OR = 4.456, 95% CI 1.861-10.669, P = 0.001) were identified as significant risk factors. CONCLUSION The risk of fracture is increased in males, especially those with a mandibular angle of less than 120° on panoramic radiographs, and those with a non-splinted superstructure.
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Affiliation(s)
- Hiroshi Murakami
- Department of Fixed Prosthodontics and Oral Implantology, Nihon University School of Dentistry at Matsudo
| | - Kentaro Igarashi
- Department of Removable Prosthodontics, Nihon University School of Dentistry at Matsudo
| | - Megumi Fuse
- Liberal Arts (Chemistry), Nihon University School of Dentistry at Matsudo
| | - Tsuyoshi Kitagawa
- Department of Fixed Prosthodontics and Oral Implantology, Nihon University School of Dentistry at Matsudo
| | - Mitsuhiko Igarashi
- Department of Histology, Nihon University School of Dentistry at Matsudo
| | - Satoshi Uchibori
- Department of Fixed Prosthodontics and Oral Implantology, Nihon University School of Dentistry at Matsudo
| | - Chiaki Komine
- Department of Oral Health Science, Division of Laboratory Medicine for Dentistry, Nihon University School of Dentistry at Matsudo
| | - Hiroya Gotouda
- Department of Community Oral Health, Nihon University School of Dentistry at Matsudo
| | - Hiroyuki Okada
- Department of Histology, Nihon University School of Dentistry at Matsudo
| | - Yasuhiko Kawai
- Department of Removable Prosthodontics, Nihon University School of Dentistry at Matsudo
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10
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Maeda R, Takei E, Ito K, Magara J, Tsujimura T, Inoue M. Inter‐individual variation of bolus properties in triggering swallowing during chewing in healthy humans. J Oral Rehabil 2020; 47:1161-1170. [DOI: 10.1111/joor.13044] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 06/16/2020] [Accepted: 06/23/2020] [Indexed: 11/29/2022]
Affiliation(s)
- Rumiko Maeda
- Division of Dysphagia Rehabilitation Niigata University Graduate School of Medical and Dental Sciences Niigata Japan
- Department of Rehabilitation Faculty of Health Science Kansai University of Welfare Sciences Osaka Japan
| | - Eri Takei
- Division of Dysphagia Rehabilitation Niigata University Graduate School of Medical and Dental Sciences Niigata Japan
| | - Kayoko Ito
- Oral RehabilitationNiigata University Medical and Dental Hospital Niigata Japan
| | - Jin Magara
- Division of Dysphagia Rehabilitation Niigata University Graduate School of Medical and Dental Sciences Niigata Japan
| | - Takanori Tsujimura
- Division of Dysphagia Rehabilitation Niigata University Graduate School of Medical and Dental Sciences Niigata Japan
| | - Makoto Inoue
- Division of Dysphagia Rehabilitation Niigata University Graduate School of Medical and Dental Sciences Niigata Japan
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The Influence of the Gonial Angle on the Initial Biomechanical Stability of the Plate Osteosynthesis in Polyurethane Mandibles With Angle Fractures. J Craniofac Surg 2020; 31:871-875. [PMID: 31895842 DOI: 10.1097/scs.0000000000006099] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
The aim of the present study was to examine the biomechanical stability of the mandibular angle fractures (MAF) fixated with standard titanium miniplates in polyurethane models with different gonial angles (GA). Three custom molds were prepared for 3-dimensional printed mandibles with low, normal and high GA. Twenty polyurethane replicas were cast per group and standard MAFs were created on each sample. Fractures were stabilized with 1 4-hole standard titanium miniplate inserted over the superior alveolar border. Half of the samples were subjected to molar loading and the other half to the incisal loading up until 150 N force magnitude. The load-displacement curves and the horizontal moment arms were recorded and analyzed. The samples with high GA demonstrated greater displacement than those with normal and low GA during molar loading (P < 0.05 for both). After correcting for the effects of the moment arm, the incisal loading also resulted in higher mean displacement in the high GA group than the others (P < 0.05 for both) and the normal GA samples showed higher displacement after 100 N level compared to those in low GA (P < 0.05). Within the limits of this in vitro study, it can be concluded that the MAFs of the polyurethane mandibles with high GA fixated with 1 standard monocortical plate are more likely to demonstrate higher displacement values under the effects of the molar and incisal loadings than do the mandibles with normal and low GA.
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12
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Mameno T, Wada M, Otsuki M, Okuno I, Ozeki K, Tahara A, Ikebe K. Risk indicators for marginal bone resorption around implants in function for at least 4 years: A retrospective longitudinal study. J Periodontol 2019; 91:37-45. [PMID: 31373383 DOI: 10.1002/jper.18-0756] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2018] [Revised: 05/30/2019] [Accepted: 05/30/2019] [Indexed: 01/03/2023]
Abstract
BACKGROUND Marginal bone stability is considered one of the most important issues in implant dentistry. It is essential to understand how various factors influence bone resorption around implants. The purpose of this retrospective longitudinal study was to identify potential risk indicators associated with marginal bone resorption around implants in function for at least 4 years. METHODS Several systemic-related, intraoral-related, implant-related factors were collected. Marginal bone level change (MBLC) was determined by comparing intraoral radiographs taken at baseline (1 year after prosthesis delivery), and at follow-up (over 3 years from baseline). A hierarchical regression analysis using liner mixed-effects models was performed to examine correlations between MBLC and various factors. RESULTS Overall, 514 patients with 1535 implants were analyzed. The mean age of the participants was 62.9 years. Mean annual MBLC was 0.048 mm, and mean functional time was 5.96 years. The result showed that the following explanatory variables had significant effects on MBLC: functional time, plaque control record > 20%, Eichner index C1-3, maxilla, cement-retained superstructure, and keratinized mucosa width < 2 mm. We did not find statistically significant associations between bone resorption and some variables known as risk factors, such as diabetes, smoking, and history of periodontitis. CONCLUSIONS Within the limits of this study, longer functional time, poor oral hygiene, loss of occlusal support, location in the maxilla, cement-retained superstructure, and less keratinized mucosa should be considered as risk indicators for bone resorption around implants.
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Affiliation(s)
- Tomoaki Mameno
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Suita, Osaka, Japan
| | - Masahiro Wada
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Suita, Osaka, Japan
| | - Motohiro Otsuki
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Suita, Osaka, Japan
| | - Ikuhisa Okuno
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Suita, Osaka, Japan
| | - Kenji Ozeki
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Suita, Osaka, Japan
| | - Akihiko Tahara
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Suita, Osaka, Japan
| | - Kazunori Ikebe
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Suita, Osaka, Japan
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