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Singh M, Singh S, Kumar L, Mattoo KA, Khalid I, Kota MZ, Udeabor SE, Baig FAH, Ishfaq M, Ibrahim M, Basheer SA. Evaluation of Retentive Strength of 50 Endodontically-Treated Single-Rooted Mandibular Second Premolars Restored with Cast Post Cores Using 5 Common Luting (Cement) Agents. Med Sci Monit 2024; 30:e944110. [PMID: 38685688 PMCID: PMC11069323 DOI: 10.12659/msm.944110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2024] [Accepted: 03/01/2024] [Indexed: 05/02/2024] Open
Abstract
BACKGROUND A luting agent is a dental cement used to secure a dental restoration. This study aimed to evaluate retentive strength of 50 endodontically-treated single-rooted mandibular second premolars (extracted) restored using 5 common luting (cement) agents. MATERIAL AND METHODS Fifty single-rooted mandibular second premolars with adequate root length and uniform size/shape were decoronated. After completing endodontic biomechanical preparation and obturation, root canals of all specimens were prepared to receive a cast post core. Depending upon cementation type, CPC specimens were divided in 5 groups (10 each) (Gp): Zinc phosphate (Gp ZP), polycarboxylate (Gp PC), glass ionomer (Gp GI), resin-modified glass ionomer (Gp RGI), and resin cement (Gp RC). Retentive strength was determined using the adhesive failure pull-out test. Mean/standard deviations were calculated for tensile forces (in kilograms) and differences were determined using analysis of variance (ANOVA). Multiple comparison was performed using the t test. A P value of ≤0.05 indicated a statistically significant difference. RESULTS The order of mean tensile strength from higher to lower was Gp RC (21.46) >Gp RGI (18.17) >Gp GI (16.07) >Gp ZP (15.33) >Gp PC (13.63). Differences in retentive strengths between the cements were significant (P≤0.05). Multiple-group comparisons showed that except for Gp ZP and Gp GI, all groups differed significantly from each other. CONCLUSIONS All investigated cements provided optimal retentive strengths, with wide differences between them. Resin cements should be used when CPC removal is not anticipated, while polycarboxylate or zinc phosphate should be used if CPC removal is anticipated.
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Affiliation(s)
- Monika Singh
- Independent Researcher, Oakville, Ontario, Canada
| | - Soundarya Singh
- Department of Periodontology, Subharti Dental College and Hospital, Swami Vivekanand Subharti University, Meerut, Uttar Pradesh, India
| | - Lakshya Kumar
- Department of Prosthodontics, King George`s Medical University, Lucknow, Uttar Pradesh, India
| | - Khurshid A. Mattoo
- Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan, Saudi Arabia
| | - Imran Khalid
- Department of Oral and Maxillofacial Surgery, College of Dentistry, King Khalid University, Abha, Saudi Arabia
| | - Mohammad Zahir Kota
- Department of Oral and Maxillofacial Surgery, College of Dentistry, King Khalid University, Abha, Saudi Arabia
| | - Samuel Ebele Udeabor
- Department of Oral and Maxillofacial Surgery, College of Dentistry, King Khalid University, Abha, Saudi Arabia
| | - Fawaz Abdul Hamid Baig
- Department of Oral and Maxillofacial Surgery, College of Dentistry, King Khalid University, Abha, Saudi Arabia
| | - Muhammad Ishfaq
- Department of Oral and Maxillofacial Surgery, College of Dentistry, King Khalid University, Abha, Saudi Arabia
| | - Mohammed Ibrahim
- Department of Oral and Maxillofacial Surgery, College of Dentistry, King Khalid University, Abha, Saudi Arabia
| | - Sulphi Abdul Basheer
- Department of Oral and Maxillofacial Surgery, College of Dentistry, King Khalid University, Abha, Saudi Arabia
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Sayed ME, Porwal A, Hamdi BA, Hurubi SY, Hakami AK, Hakami AJ, Dighriri AM, Jad YA, Alqahtani SM, Alsubaiy EF, Alfaifi MA, Altoman MS, Jokhadar HF, AlResayes SS. Impact of Auxiliary Features on Retention of Short Dental Crowns: An In-Vitro Analysis of Box and Groove Preparations. Med Sci Monit 2024; 30:e943401. [PMID: 38444156 PMCID: PMC10926708 DOI: 10.12659/msm.943401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Accepted: 01/03/2024] [Indexed: 03/07/2024] Open
Abstract
BACKGROUND Several auxiliary features have been proposed to achieve sustainable retention for short-prepared dental crowns; however, achieving retention is challenging. This study aimed to assess the impact of increased total occlusal convergence and auxiliary preparation factors like box and groove on the retention form of short tooth preparations. MATERIAL AND METHODS Eighty resin machine-milled dies with a height of 3 mm and a deep chamfer margin of 1 mm were prepared to mimic the short-prepared molar. Initially, 2 teeth were prepared following the guidelines, and the total occlusal convergence was kept at 10° and 20°, respectively. Auxiliary features such as the proximal box and buccal groove were prepared on separate 20° dies. Eighty dies were prepared with 10 samples each for 10°, 20°, 20° with proximal box and 20° with buccal groove for zirconia (n=40) and metal crowns (n=40). Cementation was done with glass ionomer luting cement, and a pull-off test was conducted. Data were analyzed using one-way analysis of variance and post hoc fisher least significant difference test (P<0.05). RESULTS The highest mean was observed in the proximal box group with the metal crown (14.59), and the lowest in the group with 20° zirconia crowns (9.12). Within groups, the highest retentive values were found for the 20° taper with proximal box preparation; the lowest was for the 20° taper group. CONCLUSIONS Within the study limitations, it could be concluded that incorporating a proximal box or buccal groove in short tooth preparations with an increased total occlusal convergence improved retentive values.
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Affiliation(s)
- Mohammed E. Sayed
- Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan, Saudi Arabia
| | - Amit Porwal
- Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan, Saudi Arabia
| | - Bassam Ali Hamdi
- Intern, College of Dentistry, Jazan University, Jazan, Saudi Arabia
| | - Salman Y. Hurubi
- Intern, College of Dentistry, Jazan University, Jazan, Saudi Arabia
| | | | | | | | - Yaser A. Jad
- Intern, College of Dentistry, Jazan University, Jazan, Saudi Arabia
| | - Saeed M. Alqahtani
- Department of Prosthetic Dentistry, College of Dentistry, King Khalid University, Abha, Saudi Arabia
| | - Ebrahim Fihaid Alsubaiy
- Department of Prosthetic Dentistry, College of Dentistry, King Khalid University, Abha, Saudi Arabia
| | - Mohammed A. Alfaifi
- Department of Prosthetic Dentistry, College of Dentistry, King Khalid University, Abha, Saudi Arabia
| | - Majed S. Altoman
- Department of Prosthetic Dentistry, College of Dentistry, King Khalid University, Abha, Saudi Arabia
| | - Hossam F. Jokhadar
- Department of Oral and Maxillofacial Prosthodontics, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Saad Saleh AlResayes
- Department of Prosthetic Dental Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia
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Yee A, Meei TI, Ling GC. Managing Fibrous Maxillary Ridge: A Case Series of Impression Techniques. Prim Dent J 2023; 12:51-56. [PMID: 36916614 DOI: 10.1177/20501684231153909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
Abstract
Fibrous ridges on the edentulous maxillary arch are commonly found in combination syndrome or due to ill-fitting dentures. Often, these cases are managed conservatively using modified impression techniques to achieve better support and peripheral seal without displacing the movable tissue. Many impression techniques were proposed and justified with their respective ideologies, but some may complicate both the clinical and laboratory procedures. In this report, two simplified techniques are demonstrated to make an impression of the maxillary arch with fibrous ridges. Laboratory steps in custom tray fabrication are also emphasised for a successful and predictable impression.
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Affiliation(s)
- Ang Yee
- Ang Yee Senior Lecturer, Faculty of Dentistry, MAHSA University, Malaysia.,Tew In Meei Lecturer and Clinical Specialist in Prosthodontics, Department of Restorative Dentistry, Faculty of Dentistry, National University of Malaysia.,Goo Chui Ling Lecturer and Clinical Specialist in Prosthodontics, Department of Restorative Dentistry, Faculty of Dentistry, National University of Malaysia
| | - Tew In Meei
- Ang Yee Senior Lecturer, Faculty of Dentistry, MAHSA University, Malaysia.,Tew In Meei Lecturer and Clinical Specialist in Prosthodontics, Department of Restorative Dentistry, Faculty of Dentistry, National University of Malaysia.,Goo Chui Ling Lecturer and Clinical Specialist in Prosthodontics, Department of Restorative Dentistry, Faculty of Dentistry, National University of Malaysia
| | - Goo Chui Ling
- Ang Yee Senior Lecturer, Faculty of Dentistry, MAHSA University, Malaysia.,Tew In Meei Lecturer and Clinical Specialist in Prosthodontics, Department of Restorative Dentistry, Faculty of Dentistry, National University of Malaysia.,Goo Chui Ling Lecturer and Clinical Specialist in Prosthodontics, Department of Restorative Dentistry, Faculty of Dentistry, National University of Malaysia
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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Alshenaiber R, Barclay C, Silikas N. The Effect of Number and Distribution of Mini Dental Implants on Overdenture Stability: An In Vitro Study. Materials (Basel) 2022; 15:ma15092988. [PMID: 35591322 PMCID: PMC9104554 DOI: 10.3390/ma15092988] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/19/2022] [Revised: 04/09/2022] [Accepted: 04/16/2022] [Indexed: 02/05/2023]
Abstract
The rotational movement of mini dental implants (MDIs) overdenture disturbs the function of the prosthesis. Many dentists place more MDIs to improve the overdenture stability; however, the influence of the MDIs number and distribution on the overdenture resistance to para-axial dislodgment has not been investigated. Seven resin models simulating atrophic mandibles housed twenty MDIs placed according to seven arrangements. Acrylic overdentures were fabricated for each cast and were dislodged five times in lateral, anterior and posterior directions, and the peak load dislodgment was measured. Each overdenture underwent 540 axial removal/placement cycles. The para-axial dislodgments were measured again, and data were compared. Dislodgment force values were measured in all directions, and the data were analysed using analysis of variance ANOVA and post hoc (p < 0.05). After six months of simulated placement/removal, increasing the MDI number showed a difference in resistance to para-axial dislodgment. The distribution affected the resistance to dislodgment in some directions. The inter-implant distance of 27 mm provided better resistance to posterior dislodgment than placing two MDIs close together at 19 mm. The placement of three MDIs at any distribution showed no significant difference except for resistance to posterior dislodgment. FourMDIs placed at any distribution showed a significant difference in all groups in all tested directions. The resistance to the para-axial dislodgment of MDI overdenture could improve with the increasing MDIs number and careful planning of MDI distribution.
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Affiliation(s)
- Rafif Alshenaiber
- Division of Dentistry, Faculty of Biology, Medicine and Health, University of Manchester, Manchester M13 9PL, UK;
- Prosthetic Dental Sciences Department, College of Dentistry, Prince Sattam Bin Abdulaziz University, AlKharj 16278, Saudi Arabia
- Correspondence: ; Tel.: +44-7477426007
| | - Craig Barclay
- Restorative Dentistry, University of Manchester Dental Hospital, Manchester M15 6FH, UK;
| | - Nick Silikas
- Division of Dentistry, Faculty of Biology, Medicine and Health, University of Manchester, Manchester M13 9PL, UK;
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Yamaguchi-Komeyama K, Tanoue N, Kurata S, Ayuse T. Dental treatment under intravenous sedation prolongs longevity of a fixed prosthesis in patients with intellectual disabilities. Spec Care Dentist 2021; 42:209-215. [PMID: 34791692 DOI: 10.1111/scd.12677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 10/27/2021] [Accepted: 11/01/2021] [Indexed: 11/27/2022]
Abstract
AIMS This study aimed to assess the longevity of a fixed prosthesis in patients with intellectual disability (ID) and to investigate the risk factors associated with the failure of a prosthesis due to abutment tooth extraction or prosthesis dislodgement or removal. METHODS We studied past medical records to evaluate the longevity of 315 prostheses that were luted in 76 patients with ID. We calculated the survival rates and assessed 15 variables potentially associated with prosthetic failure using multivariate Cox regression analyses with shared frailty for patients. RESULTS Three-quarters of our sample population had severe or profound ID. The maximum observation period was 31.0 years, and the corresponding survival ratio was 32.5%; the survival ratio at 10 years was 59.4%. The use of intravenous sedation significantly influenced the success of the prosthesis, with the hazard ratio (HR) being 0.49 times that of conventional treatment without behavior-altering drug therapy. The most significant risk factor for prosthetic failure was age at placement; the HR for patients aged ≥31 years was 2.82 times that for patients aged ≤ 20 years. CONCLUSIONS In patients with severe ID, appropriate intravenous sedation was effective in prolonging the longevity of a fixed prosthesis.
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Affiliation(s)
- Kaori Yamaguchi-Komeyama
- Division of Clinical Physiology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - Naomi Tanoue
- Division of Pediatric Dentistry, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - Shinji Kurata
- Division of Clinical Physiology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - Takao Ayuse
- Division of Clinical Physiology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
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Tsigarida A, Chochlidakis K, Fraser D, Lampraki E, Einarsdottir ER, Barmak AB, Papaspyridakos P, Ercoli C. Peri-Implant Diseases and Biologic Complications at Implant-Supported Fixed Dental Prostheses in Partially Edentulous Patients. J Prosthodont 2020; 29:429-435. [PMID: 32180293 DOI: 10.1111/jopr.13165] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/16/2020] [Indexed: 11/28/2022] Open
Abstract
PURPOSE This is a single center, retrospective study to assess the prevalence of peri-implant disease and biologic complications in a cohort of partially edentulous subjects in relation to selected prosthetic factors. MATERIALS AND METHODS Subjects previously treated with one or more implant-supported fixed dental prosthesis (ISFDPs) were recalled for a comprehensive examination. Clinical and radiographic records were taken and questionnaires were administered. The prevalence of implant failure, peri-implant disease and other biologic complications were correlated with selected prosthetic, clinical and patient-related factors using chi-square and multiple regression analyses. RESULTS A convenience sample of 71 subjects with 100 prostheses supported by 222 dental implants were enrolled in the study. The mean follow-up time after prosthesis delivery was 3.3 ± 1.5 years (range of 1-9 years). The cumulative implant survival rate was 99.1%. Peri-implantitis was the most frequent major biologic complication (5% of implants), while the most frequent minor biologic complication was peri-implant mucositis (84.10% of implants). A diagnosis of peri-implant mucositis was more likely associated with cement-retained prostheses compared to screw-retained prostheses (OR 6.8, 95% CI 1.1-78.6, p = 0.045) and for short-span prostheses (≤3 prosthetic units) (OR 2.3, 95% CI 1.1-5.0, p = 0.034). Subject-reported quality of life measures were high regardless of the existence of major and/or minor complications, but decreased with increasing number of minor and total biologic complications. CONCLUSIONS Peri-implant mucositis and other minor biologic complications were highly prevalent. The distribution of the observed complications differed based on the method of prosthesis retention and the number of prosthetic units replaced.
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Affiliation(s)
- Alexandra Tsigarida
- Department of Periodontology, Eastman Institute for Oral Health, University of Rochester, NY
| | | | - David Fraser
- Department of Periodontology, Eastman Institute for Oral Health, University of Rochester, NY
| | | | | | | | - Panos Papaspyridakos
- Department of Prosthodontics, Eastman Institute for Oral Health, University of Rochester, NY.,Department of Prosthodontics, Tufts School of Dental Medicine, Boston, MA
| | - Carlo Ercoli
- Department of Prosthodontics, Eastman Institute for Oral Health, University of Rochester, NY
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Chochlidakis K, Fraser D, Lampraki E, Einarsdottir ER, Barmak AB, Papaspyridakos P, Ercoli C, Tsigarida A. Prosthesis Survival Rates and Prosthetic Complications of Implant-Supported Fixed Dental Prostheses in Partially Edentulous Patients. J Prosthodont 2020; 29:479-488. [PMID: 32364656 DOI: 10.1111/jopr.13185] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2020] [Revised: 04/26/2020] [Accepted: 04/27/2020] [Indexed: 12/25/2022] Open
Abstract
PURPOSE To determine the prevalence and distribution of prosthetic complications affecting implant-supported fixed dental prostheses (ISFDPs). MATERIALS AND METHODS Subjects previously treated with one or more ISFDP(s) were identified from an electronic health record search and recalled for comprehensive clinical examination. Past prosthesis failures and complications were identified from the patient records while any existing complications, not previously recorded, were assessed during examination. ISFDP survival and failure rates were calculated with Kaplan-Meier curves and life table analysis, while regression Poisson analysis was used to identify associations between outcomes and possible patient- and prosthesis-based risk factors. RESULTS Seventy-four subjects with 107 ISFDPs were enrolled in the study with a mean time between prosthesis delivery and exam of 3.14 years (range: 1.00-9.00 years). Four prostheses failed, resulting in a cumulative prosthesis survival rate of 96.26%. Prosthetic complications affected 48.59% of ISFDPs, the majority (94.87%) of them minor complications. Only the use of a nightguard was associated with a lower prevalence of prosthetic screw loosening (HR 0.11, 95% CI 0.02-0.59, p = 0.007) while no outcome differences were noted for other variables. Patient satisfaction was high regardless of presence or number of complications. CONCLUSIONS ISFDPs demonstrated a high survival rate and overall high, patient-reported satisfaction. Minor prosthetic complications were common but were only significantly associated with nightguard use.
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Affiliation(s)
- Konstantinos Chochlidakis
- Department of Prosthodontics, Eastman Institute for Oral Health, University of Rochester, Rochester, NY
| | - David Fraser
- 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
| | - Panos Papaspyridakos
- Department of Prosthodontics, Eastman Institute for Oral Health, University of Rochester, Rochester, NY.,Department of Prosthodontics, Tufts School of Dental Medicine, Boston, MA
| | - Carlo Ercoli
- Department of Prosthodontics, Eastman Institute for Oral Health, University of Rochester, Rochester, NY
| | - Alexandra Tsigarida
- Department of Periodontology, Eastman Institute for Oral Health, University of Rochester, Rochester, NY
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Feitosa PCP, de Lima APB, Silva-Concílio LR, Brandt WC, Claro Neves AC. Stability of external and internal implant connections after a fatigue test. Eur J Dent 2014; 7:267-271. [PMID: 24926204 PMCID: PMC4053613 DOI: 10.4103/1305-7456.115407] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Objective: The objective of this study was to compare the torque and detorque values of screw intermediates of external hexagon, internal hexagon, and Morse taper implants in single restorations before and after mechanical cycling. Materials and Methods: The study sample was divided into three groups (n = 10) as follows: group EH – external hexagon implant, group IH – internal hexagon implant, and group MT – Morse taper implant. Universal abutments were screwed on the implants, and metal crowns were cemented onto the abutment. The samples were submitted to a mechanical testing of 1 million cycles, with a frequency of 8 cycles per second under a 400 N load. The application and registration of the screw torque (T0) and detorque (T1) values of the intermediate were performed before and after the test. The results were statistically evaluated by analysis of variance (ANOVA) and Tukey's test (α = 0.05). Results: There was no difference between the values of T0 and T1 in the intra-group samples. However, the inter-group difference in T0 between the EH (12.8 N cm) and MT (18.6 N cm) groups and in T1 between the EH (10.4 N cm) and IH (13.8 N cm), EH and MT (19.4 N cm), and MT and IH (P = 0.001) groups were significant. The MT group showed a lower variation of T0 and T1. Conclusion: The internal implants, particularly MT, showed better stability in these cases when used for single restorations.
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Affiliation(s)
| | | | | | - William Cunha Brandt
- Department of Dentistry, Area of Implantology, University of Santo Amaro, São Paulo-SP, Brazil
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