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Şentürk A, Akaltan F. Biomechanical behavior of all-on-4 concept and alternative designs under different occlusal load configurations for completely edentulous mandible: a 3-D finite element analysis. Odontology 2024; 112:1231-1247. [PMID: 38689144 DOI: 10.1007/s10266-024-00941-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Accepted: 04/15/2024] [Indexed: 05/02/2024]
Abstract
The aim of this study was to evaluate the effect of the All-on-4 design and 4 alternative implant-supported fixed prosthesis designs on stress distribution in implants, peri-implant bone, and prosthetic framework in the edentulous mandible under different loading conditions using three-dimensional finite element analysis (3D-FEA).Five different experimental finite element models (Model A (unsplinted 6), Model B (splinted 6), Model C (All-on-4), Model D (axial; 2 anterior, 2 posterior), and Model E (4 interforaminal)) were created. Three different loading conditions were applied (canine loading, unilateral I-loading, and unilateral II-loading). The highest minimum (Pmin) and the maximum (Pmax) principal stress values were acquired for cortical and trabecular bones; the highest von Mises (mvM) stress values were obtained for implants and metal frameworks. Model B and Model D showed the most favorable stress distribution. The All-on-4 design (Model C) also showed acceptable stress values close to those of Model B and Model D in the cortical and trabecular bones. In accordance with the stress values in the bone structure, the lowest stress values were measured in the implants and Co-Cr framework in Model B and Model D. The highest stress values in all structures were measured for unilateral loading- II, while the lowest values were found for canine loading. It was concluded that Model B and Model D experimental models showed better biomechanical performance in all structures. Furthermore, the use of a splinted framework, avoiding cantilevers, results in lower stress transmission. On the other hand, canine loading and unilateral loading-I exhibited the best loading conditions.
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Affiliation(s)
- Ayben Şentürk
- Department of Prosthodontics, Faculty of Dentistry, Ankara University, Ankara, Turkey.
| | - Funda Akaltan
- Department of Prosthodontics, Faculty of Dentistry, Ankara University, Ankara, Turkey
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Long H, Zhang H, Deng L, Li C, Zhu Y, Ling S, Li D, Zhou X, Liu H, Zhong Z, Peng G, Wang C, Zhou Z. Biomechanics of Dental Implantation in the Giant Panda ( Ailuropoda melanoleuca): A Comparative Study Using Finite Element Analysis. J Vet Dent 2024:8987564241265420. [PMID: 39042890 DOI: 10.1177/08987564241265420] [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: 07/25/2024]
Abstract
Giant pandas have a high incidence of tooth wear, loss, and fracture since their diet is specifically bamboo. Dental implantation is a common treatment for tooth loss in humans while rarely reported in wild animals. To explore the applicability of dental implantation in giant pandas, this study measured mandible parameters of the giant panda, from an adult skeletal specimen. The mandible bone block model was developed using computer-aided design 3D mechanical drawing software. Implants of different radius and thread types of the third premolar tooth (PM3) were assembled and imported into an analysis software system for finite element analysis. As a result, the reverse buttress implant with a radius of 7.5 mm and 8.3 mm, and a length of 15 mm was found to be the most suitable implant for use in the giant panda PM3. This study provides a reference for appropriate clinical giant panda dental implantation, although, the feasibility of giant panda dental implantation needs to be studied further.
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Affiliation(s)
- Han Long
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Huimin Zhang
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Linhua Deng
- China Conservation and Research Center for Giant Panda, Chengdu, Sichuan, China
| | - Caiwu Li
- China Conservation and Research Center for Giant Panda, Chengdu, Sichuan, China
| | - Yan Zhu
- China Conservation and Research Center for Giant Panda, Chengdu, Sichuan, China
| | - Shanshan Ling
- China Conservation and Research Center for Giant Panda, Chengdu, Sichuan, China
| | - Desheng Li
- China Conservation and Research Center for Giant Panda, Chengdu, Sichuan, China
| | - Xiaoxiao Zhou
- Chengdu Center for Animal Disease Prevention and Control, Chengdu, Sichuan, China
| | - Haifeng Liu
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Zhijun Zhong
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Guangneng Peng
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Chengdong Wang
- China Conservation and Research Center for Giant Panda, Chengdu, Sichuan, China
| | - Ziyao Zhou
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
- Key Laboratory of Agricultural Bioinformatics, Ministry of Education, Sichuan Agricultural University, Chengdu, Sichuan, China
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Mao Z, Bleiel H, Beuer F, Böse MWH, Soetebeer M. Occlusal changes on implant-supported single crowns with one year follow-up after loading: A systematic review and meta-analysis. J Dent 2024; 146:105000. [PMID: 38734300 DOI: 10.1016/j.jdent.2024.105000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Accepted: 04/17/2024] [Indexed: 05/13/2024] Open
Abstract
OBJECTIVE This systematic review evaluated the occlusal changes after loading with implant-supported single crowns. SOURCES An electronic literature search was conducted in PubMed, Embase and Cochrane library for randomized (RCTs) or non-randomized controlled clinical trials (CCTs), with a minimum of 10 patients. STUDY SELECTION Studies reporting the occlusal force changes on implant-supported single crowns - with natural teeth as antagonist - measured at baseline and after loading periods were included. 4 CCTs including 133 ISCs in posterior sites were included for meta-analysis. All analyzed ISCs had no contact at a light bite and a light contact at a heavy bite in MIP at loading (baseline). DATA The relative occlusal forces (ROFs) of each implant-supported single crown (ISC) or control tooth (CT) were extracted. ROFs were defined as percentage of the total occlusal force of the entire dentition at maximum intercuspal position (MIP). A meta-analysis was conducted to compare the ROF changes at different follow-up periods and the weighted mean differences in ROF between ISCs and CTs were pooled and analyzed. The amount of change in ROF was significantly lower in 6 to 12 months after loading comparing the follow-up period between baseline and 6 month (p < 0.05). At baseline and 3-month follow-up, CTs presented significant higher ROF than ISCs (p < 0.05), while no significant difference was found after half year following. CONCLUSIONS This study showed that the ROF changes significantly over time after loading of ISCs. It might prove that the occlusal concept defined at the time of prosthetic delivery changes or adapts naturally over time. CLINICAL SIGNIFICANCE The function of specific implant occlusal concept (no contact at a light bite and a light contact at a heavy bite in MIP) is limited over time and careful monitoring and occlusal adjustments should be recommendable during the first-year follow-up.
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Affiliation(s)
- Zhen Mao
- Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Aßmannshauser Str. 4-6, 14197 Berlin, Germany.
| | - Hannah Bleiel
- Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Aßmannshauser Str. 4-6, 14197 Berlin, Germany
| | - Florian Beuer
- Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Aßmannshauser Str. 4-6, 14197 Berlin, Germany
| | - Mats Wernfried Heinrich Böse
- Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Aßmannshauser Str. 4-6, 14197 Berlin, Germany
| | - Maren Soetebeer
- Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Aßmannshauser Str. 4-6, 14197 Berlin, Germany
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Gopalakrishnan K, Chandrasekaran B, John RR. Comparison of accuracy of immediate implant placement between planned and actual position in pre-extractive versus conventional method - A prospective study. J Craniomaxillofac Surg 2024; 52:598-605. [PMID: 38378368 DOI: 10.1016/j.jcms.2024.02.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2023] [Accepted: 02/11/2024] [Indexed: 02/22/2024] Open
Abstract
This study aims to evaluate the accuracy of immediate implants in mandibular molars between the conventional method and the pre-extractive inter-radicular method. MATERIALS AND METHODS A total of 20 patients were equally divided into two groups. Implants were placed using the conventional method (Group A) and pre-extractive inte-rradicular method (Group B). Coronal, apical and angular deviation between planned and placed implants were evaluated by superimposing preoperative and postoperative three-dimensional (3D) STL models in Geomagic Freeform software. The data were subjected to an unpaired Student t-test. RESULTS Results revealed that the coronal, apical and angular deviation were lower in the pre-extractive inter-radicular drilling method than in the conventional method, which was statistically significant. Apical deviation was greater than coronal deviation in both the sagittal and coronal planes. It was also found that the mean deviation was greater in the sagittal plane (mesio-distal axis) than in the coronal plane (bucco-lingual axis). CONCLUSION Comparison of the two methods revealed significant changes between the planned and actual positions of implant. When stringent steps were followed, the degree of deviation was found to be less in the pre-extractive inter-radicular approach, proving it to be more accurate than the conventional method. However, large-scale research studies are required to extrapolate our findings.
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Affiliation(s)
- Kathirvel Gopalakrishnan
- Department of Oral and Maxillofacial Surgery, Vinayaka Mission's Sankarachariyar Dental College, Vinayaka Mission's Research Foundation (Deemed to Be University), Salem, Tamilnadu, India.
| | - Balamanikandasrinivasan Chandrasekaran
- Department of Oral and Maxillofacial Surgery, Vinayaka Mission's Sankarachariyar Dental College, Vinayaka Mission's Research Foundation (Deemed to Be University), Salem, Tamilnadu, India.
| | - Reena Rachel John
- Department of Oral and Maxillofacial Surgery, Vinayaka Mission's Sankarachariyar Dental College, Vinayaka Mission's Research Foundation (Deemed to Be University), Salem, Tamilnadu, India
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李 穗, 马 雯, 王 时, 丁 茜, 孙 瑶, 张 磊. [Trueness of different digital design methods for incisal guidance of maxillary anterior implant-supported single crowns]. BEIJING DA XUE XUE BAO. YI XUE BAN = JOURNAL OF PEKING UNIVERSITY. HEALTH SCIENCES 2024; 56:81-87. [PMID: 38318900 PMCID: PMC10845184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Indexed: 02/07/2024]
Abstract
OBJECTIVE To compare the trueness of incisal guidance of implant-supported single crowns designed by patient-specific motion (PSM) with that designed by average-value virtual articulator (AVA). METHODS The study had recruited 12 participants with complete dentition and stable incisal guidance. An intraoral scanner was used to scan digital casts and record two types of patient-specific motion (data only including protrusive movement, and data including protrusive movement and lateral protrusive movement). The lingual surfaces of the maxillary incisors which guided the protrusive movement was selected and elevated to create a reference cast. A maxillary central incisor of original casts was vir-tually extracted and implanted to generate a working cast. The Dental system software program was used to design implant-supported single crowns with the anatomical coping design method. The incisal guidance was designed by different methods. The incisal guidance in control group was designed by the average-value virtual articulator. The incisal guidance in experiment groups was designed by the patient-specific motion only including protrusive movement (PSM1) and with the patient-specific motion including protrusive movement and lateral protrusive movement (PSM2). The incisal guidance of prosthesis designed by these 3 methods were compared with the original incisal guidance in Geomagic Control 2015 (3DSystem, America). The measurements included: Average of positive values, ratio of positive area and maximum value reflecting supra-occlusion; average of negative values, ratio of negative area and minimum value reflecting over-correction; and root mean square reflecting overall deviation. RESULTS Statistical data were collected using the median (interquartile range) method. The average of positive values, ratio of positive area and average of negative values of the PSM2 group were smaller than those of the control group [8.0 (18.8) μm vs. 37.5 (47.5) μm; 0 vs. 7.2% (38.1%); -109.0 (63.8) μm vs.-66.5 (64.5) μm], and the ratio of negative area of PSM2 group was larger than those of the control group [52.9% (47.8%) vs. 17.3% (45.3%)], with significant differences (P all < 0.05). The ratio of positive area [0.1% (7.0%)] and average of negative values [-97.0 (61.5) μm] of PSM1 group, were smaller than those of the control group, and the ratio of negative area [40.7% (39.2%)] of the PSM1 group was larger than that of the control group, with significant differences (P < 0.05). The average of positive values [20.0 (42.0) μm] and ratio of positive area of PSM1 group was larger than that of the PSM2 group with significant differences (P < 0.05). CONCLUSION To establish the incisor guidance of implant-supported single crowns, compared with the average-value virtual articulator and the patient-specific motion only including protrusive movement, the patient-specific motion including protrusive movement and lateral protrusive movement is more conducive to reducing the protrusive interference of prosthesis and improving the occlusal fit.
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Affiliation(s)
- 穗 李
- 北京大学口腔医学院·口腔医院修复科,国家口腔医学中心,国家口腔疾病临床医学研究中心,口腔生物材料和数字诊疗装备国家工程研究中心,口腔数字医学北京市重点实验室,北京 100081Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - 雯洁 马
- 北京大学口腔医学院·口腔医院修复科,国家口腔医学中心,国家口腔疾病临床医学研究中心,口腔生物材料和数字诊疗装备国家工程研究中心,口腔数字医学北京市重点实验室,北京 100081Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - 时敏 王
- 北京大学口腔医学院·口腔医院义齿加工中心,国家口腔医学中心,国家口腔疾病临床医学研究中心,口腔生物材料和数字诊疗装备国家工程研究中心,口腔数字医学北京市重点实验室,北京 100081Center of Dental Laboratory, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - 茜 丁
- 北京大学口腔医学院·口腔医院修复科,国家口腔医学中心,国家口腔疾病临床医学研究中心,口腔生物材料和数字诊疗装备国家工程研究中心,口腔数字医学北京市重点实验室,北京 100081Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - 瑶 孙
- 北京大学口腔医学院·口腔医院修复科,国家口腔医学中心,国家口腔疾病临床医学研究中心,口腔生物材料和数字诊疗装备国家工程研究中心,口腔数字医学北京市重点实验室,北京 100081Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - 磊 张
- 北京大学口腔医学院·口腔医院修复科,国家口腔医学中心,国家口腔疾病临床医学研究中心,口腔生物材料和数字诊疗装备国家工程研究中心,口腔数字医学北京市重点实验室,北京 100081Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
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Potdukhe SS, Iyer JM, Nadgere JB. Evaluation of marginal bone level, technical and biological complications between screw-retained and cement-retained all-ceramic implant-supported crowns on zirconia abutment: A systematic review and meta-analysis. J Indian Prosthodont Soc 2024; 24:25-35. [PMID: 38263555 PMCID: PMC10896314 DOI: 10.4103/jips.jips_524_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2023] [Revised: 12/29/2023] [Accepted: 12/30/2023] [Indexed: 01/25/2024] Open
Abstract
PURPOSE The purpose of this study was to evaluate the difference in marginal bone level, technical and biological complications between screw-retained and cemented all-ceramic implant-supported crowns fabricated on zirconia abutment at different follow-up periods. MATERIALS AND METHODS Independent search was conducted in Cochrane Library, EBSCO, and PubMed/PubMed Central/MEDLINE databases and the Google Scholar search engine for prospective studies and randomized controlled trials published between January 2014 and June 2023 evaluating the marginal bone level, technical and biological complications between screw-retained and cemented all-ceramic implant-supported crowns fabricated on zirconia abutment. Meta-analysis was conducted to assess the quantitative data on the marginal bone level and biological complications. RESULTS A total of eight studies were included for qualitative synthesis and six studies for quantitative synthesis. For marginal bone level, no statistically significant difference was observed (P = 0.83 and P = 0.69, respectively) during the follow-up period of 3 years and 5 years. For probing depth, the cemented group showed more amount of probing depth than the screw-retained group at a follow-up period of 3 years (P < 0.05) whereas no statistically significant difference was observed at a follow-up period of 5 years (P = 0.73). For bleeding on probing, the cemented group showed more probing depth than the screw-retained group at a follow-up period of 5 years (P = 0.10). CONCLUSION The evidence suggests that the screw-retained group showed no statistically significant difference in marginal bone level, comparatively fewer biological complications, and relatively higher technical complications than the cemented group at different follow-up periods.
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Affiliation(s)
- Shruti S. Potdukhe
- Department of Prosthodontics and Crown and Bridge, MGM Dental College and Hospital, Navi Mumbai, Maharashtra, India
| | - Janani M. Iyer
- Department of Prosthodontics and Crown and Bridge, MGM Dental College and Hospital, Navi Mumbai, Maharashtra, India
| | - Jyoti B. Nadgere
- Department of Prosthodontics and Crown and Bridge, MGM Dental College and Hospital, Navi Mumbai, Maharashtra, India
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Revuru P, Mc SS. Influence of disclusion time reduction on changes in posterior implant prosthesis occlusion and its association with crestal bone loss: A clinical study. J Prosthet Dent 2023:S0022-3913(23)00281-0. [PMID: 37321940 DOI: 10.1016/j.prosdent.2023.04.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Revised: 04/06/2023] [Accepted: 04/06/2023] [Indexed: 06/17/2023]
Abstract
STATEMENT OF PROBLEM A prolonged period of high magnitude occlusal contact can be associated with rapid changes of the occlusal surfaces and, in turn, may lead to overloading of an implant-supported prosthesis. Crestal bone loss may be one of the repercussions of overloading, but the influence of disclusion time (DT) reduction (DTR) is unclear. PURPOSE The purpose of this clinical study was to evaluate the role of DTR in preventing the occlusal changes and crestal bone loss at progressive time intervals of 1 week, 3 months, and 6 months in posterior implant-supported prostheses. MATERIAL AND METHODS Twelve participants with posterior implant-supported prostheses and opposing natural teeth were enrolled in the study. Occlusion time (OT) and DT were evaluated with the T-scan Novus (version 9.1). By performing immediate complete anterior guidance development (ICAGD) coronoplasty, prolonged contacts were selectively ground to achieve OT ≤0.2 seconds and DT ≤0.4 seconds in maximum intercuspal position and laterotrusion after cementation and during follow-up visits after 1 week, 3 months, and 6 months. Crestal bone levels were evaluated after cementation and at the 6-month follow-up. Repeated measures ANOVA and Bonferroni post hoc analysis were done for OT and DT. Student paired t test was done for crestal bone level evaluation (α=.05 for all tests). RESULTS A significant decrease in OT from 0.59 ±0.24 seconds to 0.21 ±0.06 seconds (P<.001) and in DT from 1.51 ±0.6 seconds to 0.37 ±0.06 seconds (P<.001) were detected in posterior implant-supported occlusion immediately after attaining ICAGD and at the 6-month follow-up period. The mean crestal bone levels at the mesial and distal sides of the implant from day 1 (0.4 ±0.13 mm, 0.36 ±0.20 mm) to 6 months (0.40 ±0.13 mm, 0.37 ±0.19 mm) showed no significant changes (P>.05). CONCLUSIONS Minimal occlusal changes in implant prosthesis and negligible crestal bone loss were observed up to 6 months by achieving DTR according to the ICAGD protocol.
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Affiliation(s)
- Pradusha Revuru
- Postgraduate student, Department of Prosthodontics and Implantology, Vishnu Dental College, NTR University of Health Sciences, Bhimavaram, Andhra Pradesh, India.
| | - Suresh Sajjan Mc
- Professor and Head, Department of Prosthodontics and Implantology, Vishnu Dental College, NTR University of Health Sciences, Bhimavaram, Andhra Pradesh, India
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Meto A, Bardhoshi M, Tragaj E, Halimi E, Xhajanka E, Cervino G, D'Amico C, Fiorillo L, Meto A. The use of monophasic implants as an alternative of implant-prosthetic rehabilitation in the posterior maxilla with no sinus lift. Minerva Dent Oral Sci 2022; 71:25-30. [PMID: 35289541 DOI: 10.23736/s2724-6329.21.04544-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND Over the years, numerous studies and advanced technologies about dental implants have been evolved from the traditional two-stage procedure to immediate loading. Implants located in the posterior maxillary region allow to achieve an appropriate prosthetic support. The aim of this work was to solve the atrophied posterior maxilla, through monophasic implants with flapless technique and intraoral electro-welding. METHODS In this study were enrolled 120 patients between 20 and 68 years old (mean age of 34.2 years), where females predominate with 53.1% compared to 46.9% males. The patients were presented at the Oral Surgery Clinic of the Aldent University (Tirana, Albania), for a period 2009-2019. Briefly, 310 monophasic implants were placed, TRAMONTE type (Milan, Italy), to the posterior maxilla thus avoiding the sinus, with dense and wide threads, of different lengths and widths. The surgical technique was minimally invasive, flapless one. Data were expressed as mean + standard error (SEM) of all the radiographic outcomes obtained; and as statistical analysis was used the Student's t-test. P<0.5 and P<0.05, were considered significant. RESULTS A part of the patients were hypertensive and type 2 diabetic, then a negligible part were smokers, also a lack of oral hygiene was observed in 40% of cases. After 5 years of observation, it appeared that 95.9% of the implants were successful. Furthermore, the mesial and distal bone loss during the first three years was 0.1 mm, while after 5 years no continuation of bone loss was observed. CONCLUSIONS The application of monophasic implants must be performed according to approved protocols, considering the conditions of the posterior maxillary region, obtaining in this way a safe dental implantation.
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Affiliation(s)
- Agron Meto
- Department of Implantology, Faculty of Dentistry, University of Aldent, Tirana, Albania
| | - Merita Bardhoshi
- Department of Oral and Maxillofacial Surgery, Faculty of Dental Medicine, University of Medicine, Tirana, Albania
| | - Emiljano Tragaj
- Department of Implantology, Faculty of Dentistry, University of Aldent, Tirana, Albania
| | - Estela Halimi
- Department of Implantology, Faculty of Dentistry, University of Aldent, Tirana, Albania
| | - Edit Xhajanka
- Department of Prosthodontics, Faculty of Dental Medicine, University of Medicine, Tirana, Albania
| | - Gabriele Cervino
- Department of Biomedical and Dental Sciences, Morphological and Functional Images, University of Messina, Messina, Italy
| | - Cesare D'Amico
- Department of Biomedical and Dental Sciences, Morphological and Functional Images, University of Messina, Messina, Italy
| | - Luca Fiorillo
- Department of Biomedical and Dental Sciences, Morphological and Functional Images, University of Messina, Messina, Italy - .,Multidisciplinary Department of Medical-Surgical and Odontostomatological Specialties, Luigi Vanvitelli University of Campania, Naples, Italy
| | - Aida Meto
- Department of Dental Therapy, Faculty of Dental Medicine, University of Medicine, Tirana, Albania
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Occlusal change in posterior implant-supported single crowns and its association with peri-implant bone level: a 5-year prospective study. Clin Oral Investig 2022; 26:4217-4227. [PMID: 35129663 DOI: 10.1007/s00784-022-04394-0] [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: 12/13/2021] [Accepted: 01/17/2022] [Indexed: 11/03/2022]
Abstract
OBJECTIVES This study aims to analyze the 5-year occlusal change in posterior implant-supported single crowns and the association between the relative occlusal force (ROF) and peri-implant bone level. MATERIALS AND METHODS Partially edentulous patients who had received implant-supported single crowns in the posterior region were included. Occlusal examinations with a computerized occlusion analysis system were conducted at 0.5, 3, 6, 12, 24, 36, 48, and 60 months after delivery of the implant-supported single crown. The ROFs of implant-supported single crowns, mesial adjacent teeth, and control natural teeth were recorded. Intraoral periapical radiographs were taken at each follow-up time to evaluate marginal bone level (MBL). Ordinary least square regression was used to analyze the association between ROF and MBL. RESULTS Thirty-seven posterior implant-supported single crowns in 33 participants (23.9 to 70.0 years) were followed up for 0.5 to 60 months [(42.4 ± 26.0) months]. The ROF of implant-supported single crowns increased from 2 weeks to 3 months (P < 0.01) and increased continuously between all two sequential time points from 6 to 36 months, with significant differences (P < 0.05). Then ROFs of implant-supported single crowns were significantly higher than those of control teeth at 48 and 60 months (P < 0.05). Regression analysis showed that ROF was significantly associated with MBL with a coefficient of 0.008 (P < 0.05). CONCLUSION The ROFs of posterior implant-supported single crown have significant change during 5 years' follow-up. The association between ROF and MBL has limited clinical significance. TRIAL REGISTRATION Chinese Clinical Trial Registry: ChiCTR-ROC-17012240. CLINICAL RELEVANCE The occlusion of implant-supported single crowns should be carefully monitored during follow-up examinations, and occlusal adjustment should be considered to prevent overloading.
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Risk Indicators Affecting the Survival of the Mandibular First Molar Adjacent to an Implant at the Mandibular Second Molar Site: A Retrospective Study. J Clin Med 2021; 10:jcm10122543. [PMID: 34201316 PMCID: PMC8227410 DOI: 10.3390/jcm10122543] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 05/29/2021] [Accepted: 06/04/2021] [Indexed: 11/22/2022] Open
Abstract
This study aimed to compare the survival of mandibular first molars (MnM1s) adjacent to implants placed in mandibular second molar sites (ImM2s) with MnM1s adjacent to mandibular second molars (MnM2s) and to investigate risk indicators affecting the survival of MnM1s adjacent to ImM2s. A total of 144 patients who had MnM1s adjacent to ImM2s and MnM1s adjacent to MnM2s on the contralateral side were included in this study. Clinical variables and radiographic bone levels were evaluated. The survival of MnM1s adjacent to ImM2s or MnM2s was evaluated using a Kaplan–Meier analysis and Cox proportional hazards model. The 5-year cumulative survival rates of MnM1s adjacent to ImM2s and MnM2s were 85% and 95%, respectively. MnM1s adjacent to ImM2s of the internal implant-abutment connection type had higher multivariate hazard ratios (HR) for loss. MnM1s that had antagonists with implant-supported prostheses also had higher HR for loss. The multivariate HR for the loss of MnM1s adjacent to ImM2s with peri-implant mucositis was 3.74 times higher than MnM1s adjacent to healthy ImM2s. This study demonstrated several risk indicators affecting the survival of MnM1s adjacent to ImM2s. It is suggested that supportive periodontal and peri-implant therapy combined with meticulous occlusal adjustment can prolong the survival of MnM1s and ImM2s.
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Singh N, Agrawal KK, Chand P, Mishra N, Singh K, Agarwal B, Anwar M, Rastogi P, Chaurasia A. Clinical outcomes of flap versus flapless immediately loaded single dental implants in the mandibular posterior region: One-year follow-up results from a randomized controlled trial. J Prosthet Dent 2021; 128:167-173. [PMID: 33551142 DOI: 10.1016/j.prosdent.2020.08.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 08/17/2020] [Accepted: 08/17/2020] [Indexed: 10/22/2022]
Abstract
STATEMENT OF PROBLEM Flapless implant placement with immediate functional loading has been reported in anterior locations. However, data on posterior locations are lacking. PURPOSE The purpose of this randomized controlled trial was to determine and compare clinical outcomes of flap versus flapless surgically placed single posterior mandibular dental implants subjected to immediate functional loading. MATERIAL AND METHODS Participants with missing mandibular first molar teeth were recruited and randomized into 2 groups (n=51): flapped and flapless. Dental implants were surgically placed and loaded immediately with interim restorations following implant protective occlusion. Outcome measures were implant failure, crestal bone loss, and periodontal parameters: modified plaque index, modified sulcus bleeding index, and pocket depths. Outcome data were recorded at baseline, 6-month, and 12-month follow-up visits. Cone beam computed tomography scans were used to calculate crestal bone loss, and periodontal outcomes were recorded by using a resin covered periodontal probe (α=.05). RESULTS After 12 months, similar implant failure rates (P>.05) were found between the groups. Crestal bone loss in the flapped group was statistically higher than in the flapless group at 6 months (0.83 ±0.21 mm versus 0.75 ±0.23 mm) and at 12 months (1.04 ±0.27 mm versus 0.90 ±0.24 mm) from the baseline. The modified plaque index, modified sulcus bleeding index, and peri-implant probing depths (PDs) in both groups increased from the baseline to 6-month follow-ups (Baseline modified plaque index: 0.82 ±0.54 versus 0.79 ±0.21; Baseline modified sulcus bleeding index: 0.74 ±0.21 versus 0.70 ±0.43; Baseline PD: 1.25 ±0.37 mm versus 1.20 ±0.22 mm; 6 months modified plaque index: 1.54 ±0.70 versus 1.21 ±0.45; 6 months modified sulcus bleeding index: 1.93 ±0.54 versus 1.51 ±0.61; 6 months PD: 3.20 ±0.73 mm versus 2.80 ±0.43 mm). At 12-month follow-ups after repeated oral hygiene reinforcements, periodontal parameters had improved (decreased) significantly. CONCLUSIONS Flapless implant insertion with immediate functional loading could be considered as an appropriate treatment option for providing functional restorations on the day of implant placement with minimal surgical intervention, reducing crestal bone loss, and periodontal complications.
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Affiliation(s)
- Neetu Singh
- Senior Resident, Department of Prosthodontics, King George's Medical University, Lucknow, Uttar Pradesh, India
| | - Kaushal Kishor Agrawal
- Associate Professor, Department of Prosthodontics, King George's Medical University, Lucknow, Uttar Pradesh, India.
| | - Pooran Chand
- Professor, Department of Prosthodontics, King George's Medical University, Lucknow, Uttar Pradesh, India
| | - Niraj Mishra
- Professor, Department of Prosthodontics, King George's Medical University, Lucknow, Uttar Pradesh, India
| | - Kamleshwar Singh
- Additional Professor, Department of Prosthodontics, King George's Medical University, Lucknow, Uttar Pradesh, India
| | - Bhaskar Agarwal
- Associate Professor, Department of Prosthodontics, King George's Medical University, Lucknow, Uttar Pradesh, India
| | - Mohd Anwar
- Senior Research Fellow, Department of Prosthodontics, King George's Medical University, Lucknow, Uttar Pradesh, India
| | - Pavitra Rastogi
- Professor, Department of Periodontology, King George's Medical University, Lucknow, Uttar Pradesh, India
| | - Akhilanand Chaurasia
- Assistant Professor, Department of Oral medicine & Radiology, King George's Medical University, Lucknow, Uttar Pradesh, India
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Eskan MA, Uzel G, Yilmaz S. A fixed reconstruction of fully edentulous patients with immediate function using an apically tapered implant design: a retrospective clinical study. Int J Implant Dent 2020; 6:77. [PMID: 33225376 PMCID: PMC7680819 DOI: 10.1186/s40729-020-00271-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2019] [Accepted: 10/27/2020] [Indexed: 11/25/2022] Open
Abstract
Background Immediate function has become an accepted treatment modality for fixed restorations in completely edentulous jaws. It is known that implant microtopography (surface) may enhance osseointegration, while implant macrotopography (macrodesign) plays an important role in primary stability in the patient requiring an immediate loading. The aim of this retrospective study was to evaluate the clinical and radiographic outcomes of the edentulous subjects treated with narrow and/or regular diameter, which placed and loaded immediately. Methods Forty-two consecutive patients received 171 implants, including regular and narrow diameter implants (NDIs). Each jaw, 19 mandibles and 24 maxillae, was treated with a fixed-full arch prosthesis according to the Straumann® Pro Arch concept. The majority (95%) of the restorations were supported by four implants, of which the posterior two implants were tilted. A provisional functional acrylic prosthesis was delivered on the day of surgery. All patients were followed up to 55 months. Cumulative survival rate was determined using Kaplan-Meier analysis. Radiological measurement of marginal bone level was performed. Results The overall follow-up time for survival rate was up to 55 months. Four implants (3 implants in maxilla, 1 implant in mandible) were lost, resulting in an overall cumulative implant survival rate of 97.7%. Implant survival rate in the axial and tilted implants was not statistically significant. The mean of interproximal marginal bone loss was 0.15 mm after 24 months. Good soft tissue health was observed in almost 99% of patients. The final prosthesis survival rate was 100%. Conclusions The results of this retrospective pilot study indicated that total edentulous patients requiring an immediate implant placement and loading can be successfully treated with this implant design. The improved mechanical properties of these implants might give a more conservative treatment option for the jaws showing a severe horizontal alveolar bone resorption. Supplementary Information The online version contains supplementary material available at 10.1186/s40729-020-00271-1.
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Affiliation(s)
- Mehmet Akif Eskan
- Clinic Eska, Polat Tower, Fulya Mah., Yesilcimen Sk. Sisli, Istanbul, Turkey. .,College of Dental Medicine, Department of Periodontics, NOVA Southeastern University, Fort Lauderdale, FL, USA.
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Yen JY, Kang L, Chou IC, Lai YL, Lee SY. Risk assessment of interproximal contact loss between implant-supported fixed prostheses and adjacent teeth: A retrospective radiographic study. J Prosthet Dent 2020; 127:86-92. [PMID: 33172648 DOI: 10.1016/j.prosdent.2020.06.023] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 06/16/2020] [Accepted: 06/16/2020] [Indexed: 11/19/2022]
Abstract
STATEMENT OF PROBLEM Studies of interproximal contact loss (ICL) associated with implant-supported fixed prostheses (ISFPs) have typically used dental floss or metal strips to determine ICL and have shown a high prevalence of 34% to 66%, which does not match the authors' experience. Moreover, the implant prosthetic factors contributing to ICL have seldom been reported. PURPOSE The purpose of this clinical study was to examine follow-up radiographs of ISFPs to determine the prevalence of open contacts between the ISFP and adjacent teeth and to assess the risk factors associated with ICL at patient, implant prosthesis, and adjacent tooth levels. MATERIAL AND METHODS Patients treated with ISFPs at a single clinical center were included. Digital radiographs obtained at the time of ISFP delivery and subsequent follow-up were assessed, and a total of 180 ISFPs with 296 interproximal contacts in 147 patients were screened for analyses. The prevalence and risk factors of ICL at the levels of patient (age, sex, diabetes, smoking, and bruxism), implant prosthesis (follow-up period, arch location, splinting, ceramic or metal materials, screw or cement-retained, and abutment-fixture connection), and adjacent tooth (mesial or distal side, contact with unrestored tooth, composite resin restoration, or fixed prosthesis, vitality, bone height, and contralateral spacing) were analyzed with logistic regressions and generalized estimating equation (GEE) analyses (α=.05). RESULTS The onset of ICL was from 6 to 96 months after ISFP delivery. The prevalence of ICL at the patient level was 15.0%, at the implant prosthesis level 13.3%, and at the adjacent tooth levels 8.8%. Twenty-six of the participants had 2 or more ISFPs. The multivariable GEE analysis reported that sex at patient level; longer follow-up period and implant prostheses with external hexagonal and internal octagonal connections at implant prosthesis level; and contralateral spacing, contact with composite resin filling and mesial side of ISFP at adjacent tooth level were significant risk factors of ICL, where contralateral spacing had the highest adjusted odds ratio of 20.88 (P=.002). CONCLUSIONS Most of the ICL were found at the mesial side of ISFPs, and the odds of ICL was significant in participants with longer follow-up periods. Internal hexagonal connections reported relatively lower risk than others. Factors relevant to the anterior component of occlusal force, such as male sex, contralateral spacing at adjacent tooth, and proximal contact of ISFP with resin filling, seem to be high risk factors for ICL.
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Affiliation(s)
- Jui-Ying Yen
- Attending Doctor, Department of Dentistry, Yangming branch of Taipei City Hospital, Taipei, Taiwan, Republic of China; Graduate student, Department of Dentistry, National Yang-Ming University, Taipei, Taiwan, Republic of China
| | - Lei Kang
- Attending Doctor, Department of Dentistry, National Yang-Ming University Hospital, Yilan City, Taiwan, Republic of China
| | - I-Chiang Chou
- Chairperson, Department of Dentistry, Yangming branch of Taipei City Hospital, Taipei, Taiwan, Republic of China
| | - Yu-Lin Lai
- Chairperson, Department of Stomatology, Taipei Veterans General Hospital, Taipei, Taiwan, Republic of China
| | - Shyh-Yuan Lee
- Professor, Department of Dentistry, National Yang-Ming University, Taipei, Taiwan, Republic of China; Attending Doctor, Department of Stomatology, Taipei Veterans General Hospital, Taipei, Taiwan, Republic of China; Researcher, Department of Dentistry, Taipei City Hospital, Taipei, Taiwan, Republic of China.
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Nguyen-Nhon D, Nagendrababu V, Pulikkotil SJ, Rossi-Fedele G. Effect of occlusal reduction on postendodontic pain: A systematic review and meta-analysis of randomised clinical trials. AUST ENDOD J 2020; 46:282-294. [PMID: 31638301 DOI: 10.1111/aej.12380] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/22/2019] [Indexed: 11/26/2022]
Abstract
The purpose of this systematic review was to assess the effect of occlusal reduction on post-operative pain following root canal treatment and was performed in accordance with the PRISMA statement being registered in the PROSPERO database (CRD42018089941). Two reviewers independently conducted a systematic literature search in the PubMed (MEDLINE), Dentistry & Oral Sciences Source and the Cochrane Library databases. Seven studies were included, of which three were used to perform meta-analysis for 6 days post-operative and the rest for qualitative synthesis. Three studies were assessed as low risk of bias, three as some concern, and one as high risk of bias. Occlusal reduction diminishes the post-operative pain (SMD -1.10 (95%CI -2.06, -0.15) I2 = 96.9%) at 6 days for teeth diagnosed as irreversible pulpitis, and, overall, likely reduces post-operative pain for patients presenting with irreversible pulpitis and/or symptomatic apical periodontitis. Future high-quality clinical trials are needed to better understand the role of occlusal reduction.
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Affiliation(s)
- David Nguyen-Nhon
- Melbourne Dental School, University of Melbourne, Melbourne, Victoria, Australia
| | - Venkateshbabu Nagendrababu
- Division of Clinical Dentistry, School of Dentistry, International Medical University, Kuala Lumpur, Malaysia
| | - Shaju J Pulikkotil
- Division of Clinical Dentistry, School of Dentistry, International Medical University, Kuala Lumpur, Malaysia
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罗 强, 丁 茜, 张 磊, 谢 秋. [Quantitative analysis of occlusal changes in posterior partial fixed implant supported prostheses]. BEIJING DA XUE XUE BAO. YI XUE BAN = JOURNAL OF PEKING UNIVERSITY. HEALTH SCIENCES 2019; 51:1119-1123. [PMID: 31848515 PMCID: PMC7433582 DOI: 10.19723/j.issn.1671-167x.2019.06.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Indexed: 06/10/2023]
Abstract
OBJECTIVE To analyze changes in occlusal force distribution and occlusal contact in posterior partial fixed implant-supported prostheses over time, and to provide reference for the precise occlusion design, adjustment and maintenance of implant prostheses. METHODS According to certain inclusion and exclusion criteria, patients were recruited from partially edentulous patients who had received implant-supported single crown or fixed bridge in the posterior region. The patients were collected since the implant prostheses settling and scheduled for the routine examination of implant prostheses and the occlusal examinations of complete dentition after 2 weeks, 3, 6, and 12 months. Occlusal examinations were taken with the articulating papers and T-Scan III (Tekscan, South Boston, USA), which could check and measure the occlusal contact condition of complete dentition. The occlusion time and relative occlusal forces of implant prostheses, mesial adjacent teeth and control teeth were recorded at the same time. RESULTS Thirty-seven posterior partial fixed implant prostheses in 33 patients (17 women and 16 men, aged 24-70 years) were followed up for 3-12 months (average 8.3 months). At baseline, the relative occlusal forces of implant prostheses were significantly lower than those of the corresponding control teeth (P<0.001). However, after 3 months, the relative occlusal forces of implant prostheses had significantly increased (P<0.05), while control teeth decreased significantly (P<0.05), resulting in no statistical significance between them. The implant prostheses occlusion time ratio also increased significantly from 2 weeks to 3 months (P<0.05). There was no significant difference from the third month to the sixth month, or from the sixth month to the twelfth month (P>0.05). CONCLUSION Light contact and time-delayed occlusion of posterior implant prostheses changes significantly in the first three months after settling implant prostheses. These changes mainly include the advance of the time point of the implant prosthesis to start the occlusion contact, and the increase of the occlusal force of the implant prosthesis. The occlusion of posterior implant prostheses should be carefully monitored at end of the third month follow-up clinically.
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Affiliation(s)
- 强 罗
- 中国人民解放军总医院口腔医学中心,北京 100853Institute of Stomatology, General Hospital of Chinese PLA, Beijing 100853, China
| | - 茜 丁
- 北京大学口腔医学院·口腔医院,修复科 国家口腔疾病临床医学研究中心 口腔数字化医疗技术和材料国家工程实验室 口腔数字医学北京市重点实验室, 北京 100081Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - 磊 张
- 北京大学口腔医学院·口腔医院,修复科 国家口腔疾病临床医学研究中心 口腔数字化医疗技术和材料国家工程实验室 口腔数字医学北京市重点实验室, 北京 100081Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - 秋菲 谢
- 北京大学口腔医学院·口腔医院,修复科 国家口腔疾病临床医学研究中心 口腔数字化医疗技术和材料国家工程实验室 口腔数字医学北京市重点实验室, 北京 100081Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
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Bataineh K, Al Janaideh M. Effect of different biocompatible implant materials on the mechanical stability of dental implants under excessive oblique load. Clin Implant Dent Relat Res 2019; 21:1206-1217. [DOI: 10.1111/cid.12858] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Revised: 10/01/2019] [Accepted: 10/07/2019] [Indexed: 12/19/2022]
Affiliation(s)
- Khaled Bataineh
- Department of Mechanical EngineeringJordan University of Science and Technology Irbid Jordan
| | - Mohammad Al Janaideh
- Department of Mechanical EngineeringJordan University of Science and Technology Irbid Jordan
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Preliminary Study to Evaluate Marginal Bone Loss in Cases of 2- and 3-Implant-Supported Fixed Partial Prostheses of the Posterior Mandible. J Craniofac Surg 2019; 30:1068-1072. [PMID: 30394968 DOI: 10.1097/scs.0000000000004855] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
PURPOSE The purpose of this study was to evaluate, by radiographic examinations, the marginal bone resorption around implants in cases of 2 and 3 implant-supported fixed partial prostheses (FPPs) at the posterior mandible. METHODS A retrospective study of 41 patients (23 males, 18 females) of an average age of 67 years (range, 53-85), with 2 and 3 implants-supported FPPs in the posterior mandible that were treated during 2006 to 2015. The mean follow-up time was 6.32 years (range, 2-10). Twenty-four patients had FPPs on 2 implants (a total of 48 implants). Seventeen patients had FPPs on 3 implants (a total of 51 implants). Clinical and radiographic follow-up examinations were performed. All radiographs were analyzed for changes in marginal bone height surrounding the implants. RESULTS The mean marginal bone loss around the most mesial implant was slightly higher in the 2-implant group (0.833 mm) compared with the 3-implant group (0.431 mm). The correlation between the mean marginal bone loss around the most mesial implant and the number of implants was of borderline value (P = 0.055). CONCLUSIONS Considering the limitations of this preliminary study, the authors found that the mesial implant in the 2-implant group is more susceptible to marginal bone loss.
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Gil IG, Ponte BM, Mateo ST, García JJ. Treatment of Bisphosphonate-Related Osteonecrosis of the Jaw With Plasma Rich in Growth Factors After Dental Implant Surgery: A Case Report. J ORAL IMPLANTOL 2019; 45:289-296. [DOI: 10.1563/aaid-joi-d-18-00254] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Oral bisphosphonates are commonly used to improve bone density in patients who suffer from a variety of pathologies. However, they have also been known to cause bisphosphonate-related osteonecrosis of the jaws (BRONJ). The aim of this clinical case presentation is to (1) determine whether the currently recommended length of time that oral bisphosphonates should be discontinued, before performing dental implant surgery, is sufficient to prevent BRONJ and (2) to describe an alternative treatment for BRONJ. A 65-year-old female patient developed BRONJ after receiving mandibular dental implants 5 months after discontinuing alendronic acid (Fosamax). The BRONJ was treated by surgical osteotomy and plasma rich in growth factors (PRGF), and the patient was followed up with biweekly examinations, which included 0.2% chlorhexidine mouthwashes and removal of any remaining necrotic bone. The dental implants were loaded 41 weeks after surgery and followed up with periapical radiographs and implant stability quotient measurements at 3, 6, 12, and 24 months postloading. Although the Association of Oral and Maxillofacial Surgeons protocols for suspension of presurgical oral bisphosphonates were followed, this patient still developed BRONJ after implant surgery. While a multitude of treatments have been described in the literature, there is not enough scientific evidence to support any one treatment. Based on this clinical case, it can be concluded that the potential adverse effects of oral bisphosphonates on the jaws could be greater than expected and that treatment with PRGF produces promising results, although more long-term studies are necessary to confirm these findings.
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Affiliation(s)
| | | | | | - Jaime Jiménez García
- Private practice, Madrid, Spain
- Department of Implantology, European University of Madrid, Madrid, Spain
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Lan TH, Pan CY, Liu PH, Chou MMC. Fracture Resistance of Monolithic Zirconia Crowns in Implant Prostheses in Patients with Bruxism. MATERIALS 2019; 12:ma12101623. [PMID: 31108872 PMCID: PMC6567035 DOI: 10.3390/ma12101623] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2019] [Revised: 05/14/2019] [Accepted: 05/15/2019] [Indexed: 11/16/2022]
Abstract
The aim of this study is to determine the minimum required thickness of a monolithic zirconia crown in the mandibular posterior area for patients with bruxism. Forty-nine full zirconia crowns, with seven different occlusal thicknesses of 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1.0 mm, were made by using a computer-aided design/computer-aided manufacturing system (CAD/CAM). Seven crowns in each group were subjected to cyclic loading at 800 N and 5 Hz in a servohydraulic testing machine until fracture or completion of 100,000 cycles. Seven finite element models comprising seven different occlusal thicknesses of 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1.0 mm were simulated using three different loads of vertical 800 N, oblique 10 degrees 800 N, and vertical 800 N + x N torque (x = 10, 50, and 100). The results of cyclic loading tests showed that the fracture resistance of the crown was positively associated with thickness. Specimen breakage differed significantly according to the different thicknesses of the prostheses (p < 0.01). Lowest von Mises stress values were determined for prostheses with a minimal thickness of 1.0 mm in different loading directions and with different forces. Zirconia specimens of 1.0 mm thickness had the lowest stress values and high fracture resistance and under 800 N of loading.
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Affiliation(s)
- Ting-Hsun Lan
- Division of Prosthodontics, Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung 80708, Taiwan.
- School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan.
| | - Chin-Yun Pan
- Division of Orthodontics, Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung 80708, Taiwan.
| | - Pao-Hsin Liu
- Department of Biomedical Engineering, I-Shou University, Kaohsiung 82442, Taiwan.
| | - Mitch M C Chou
- Department of Materials & Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan.
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Luo Q, Ding Q, Zhang L, Xie Q. Analyzing the occlusion variation of single posterior implant-supported fixed prostheses by using the T-scan system: A prospective 3-year follow-up study. J Prosthet Dent 2019; 123:79-84. [PMID: 31079880 DOI: 10.1016/j.prosdent.2018.12.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Revised: 12/11/2018] [Accepted: 12/11/2018] [Indexed: 11/16/2022]
Abstract
STATEMENT OF PROBLEM Osseointegrated implants can be prone to occlusal overloading because of the absence of the periodontal ligament and limited tactile sensitivity. However, current scientific evidence of the occlusion variation of implant-supported fixed prostheses is lacking. PURPOSE The purpose of this clinical study was to analyze changes in occlusal force distribution and occlusal contact in single posterior partial fixed implant-supported prostheses over time. MATERIAL AND METHODS Partially edentulous patients who had received implant-supported single crowns in the posterior region between December 2012 and December 2013 were enrolled. The participants underwent occlusal examinations by using the T-Scan III system at 0.5, 3, 6, 12, 24, and 36 months after implant prosthesis delivery. The relative occlusal forces (ROFs) of implant prostheses, mesial adjacent teeth, and control natural teeth were recorded, and implant prosthesis occlusion time ratios were calculated. The paired t test was used to compare the implant prosthesis occlusion time ratios and ROFs of implant prostheses at 2 different times as a self-control. The differences in ROFs between implant prostheses and control teeth in the same participant at the same time were also analyzed by using a paired t test. The Pearson correlation coefficient was used to analyze the statistical correlation between implant prosthesis occlusal force and the implant prosthesis occlusion time ratio (α=.05). RESULTS Thirty-seven posterior partial fixed implant-supported prostheses in 33 participants (18 women and 15 men aged 23.9 to 70 years) were followed up for 3 to 36 months (mean: 31.4 months). The ROFs of implant prostheses increased significantly (P<.05) from 2 weeks (7.46 ±4.21%) to 3 months (9.87 ±6.79%), whereas those of control natural teeth decreased significantly (P<.05) from 13.78 ±6.00% to 11.43 ±5.47%. The ROFs of implant prostheses continued to increase from 6 to 12 months and from 12 to 24 months, with significant differences (P<.05). However, they were statistically similar to those of control natural teeth at 6, 12, 24, and 36 months after restoration. Implant prosthesis occlusion time ratios also increased significantly between 2 weeks and 3 months and between 3 and 6 months (P<.05). No significant differences were found between the other time points (P>.05). CONCLUSIONS The occlusal force and occlusal contact time of implant prostheses changed significantly with time.
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Affiliation(s)
- Qiang Luo
- Resident, Institute of Stomatology, Chinese PLA General Hospital, Beijing, PR China
| | - Qian Ding
- Resident, Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - Lei Zhang
- Associate Professor, Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, PR China.
| | - Qiufei Xie
- Professor, Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, PR China
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Screw-retained monolithic zirconia vs. cemented porcelain-fused-to-metal implant crowns: a prospective randomized clinical trial in split-mouth design. Clin Oral Investig 2018; 23:1067-1075. [PMID: 29946832 DOI: 10.1007/s00784-018-2531-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2018] [Accepted: 06/19/2018] [Indexed: 02/07/2023]
Abstract
OBJECTIVES The objective of the present study was to compare the clinical performance of screw-retained, monolithic, zirconia, and cemented porcelain-fused-to-metal (PFM) implant crowns. MATERIALS AND METHODS In a prospective, randomized, clinical, split-mouth trial, 22 patients' bilateral premolar or molar single-gap were restored with either screw-retained (test group) or cemented supraconstruction (control group). Clinical parameters, soft-tissue health, crestal bone-level changes, technical complications, and patient's subjective feelings were recorded during a follow-up period of 12 months. RESULTS No implant was lost during the follow-up period. Of the crowns, 4.5% (test) and 9.1% (control) showed bleeding on probing (P = 1.000), and plaque was visible in 13.6% (test) and 27.3% (control) of the crowns (P = 0.240). Changes in bone crest level seemed to have no correlation with the restoration method (P = 0.77/0.79). Technical failures were observed in three restorations of the test and four of the control group. Evaluation of patients' satisfaction revealed high acceptance regarding fit, esthetics, and chewing effectiveness in both groups. CONCLUSION Over a 12-month follow-up, screw-retained and cemented crowns could show comparable clinical and radiological results regarding soft tissue health, marginal bone level, and patient satisfaction. Duration of treatment alone was significantly shorter in screw-retained crowns. CLINICAL RELEVANCE Prosthetic retention methods are related with the occurrence of complications, such as peri-implantitis. However, scientific valuable data that proof superiority of a specific retention technique are rare. In single-gap implants, screw retention and cementation seemed to achieved comparable results.
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Madani AS, Nakhaei M, Alami M, Haghi HR, Moazzami SM. Post-insertion Posterior Single-implant Occlusion Changes at Different Intervals: A T-Scan Computerized Occlusal Analysis. J Contemp Dent Pract 2017; 18:927-932. [PMID: 28989132 DOI: 10.5005/jp-journals-10024-2151] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
AIM The aim of this prospective cohort study was to evaluate the postinsertion posterior single-implant occlusion changes at 3- and 6-month intervals using T-Scan computerized occlusal analysis. MATERIALS AND METHODS A total of 21 patients received single implant, opposed by natural dentition, in posterior regions of the maxilla or mandible (13 premolar, 8 molar) and were finally restored with cemented-retained metal-ceramic crowns. The occlusal contacts were equilibrated according to the implant-protective occlusion concept to develop light contact with heavy occlusion and no contact with light occlusion in maximum inter-cuspation. The percentage of force applied to the implant crowns (POFI) and contralateral teeth (POFT) was evaluated using T-Scan computerized occlusal analysis at prosthesis insertion, 3- and 6-month follow-up appointments. The data were statistically analyzed using Friedman test and Wilcoxon post hoc test (α = 0.05). RESULTS The POFI values at the 6- and 3-month follow-up appointments were significantly higher than those at prostheses insertion (p = 0.001 and p = 0.005 respectively). In addition, there were significant differences between the POFI at 3- and 6-month follow-up (p = 0.020). However, the POFT values at 3- and 6-month follow-up appointments were significantly lower than those at baseline (p < 0.001). CONCLUSION The intensity of occlusal contacts of implant-supported prostheses opposed by natural dentition gradually increased after prosthesis insertion. Placement of single posterior implant-supported restoration decreased the percentage of occlusal force applied to contralateral arch. CLINICAL SIGNIFICANCE A periodic occlusal adjustment of implant-supported prostheses is necessary to prevent potential overloading from the movement of opposing natural dentition.
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Affiliation(s)
- Azam S Madani
- Department of Prosthodontics, Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad, Islamic Republic of Iran
| | - Mohammadreza Nakhaei
- Department of Prosthodontics, Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad, Islamic Republic of Iran, Phone: +985138829501, e-mail: /
| | - Malihe Alami
- Department of Prosthodontics, Faculty of Dentistry, Golestan University of Medical Sciences, Gorgan, Islamic Republic of Iran
| | - Hamidreza Rajati Haghi
- Department of Prosthodontics, Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad, Islamic Republic of Iran
| | - Saied Mostafa Moazzami
- Department of Restorative Dentistry, Faculty of Dentistry Mashhad University of Medical Sciences, Mashhad, Islamic Republic of Iran
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Gowd MS, Shankar T, Ranjan R, Singh A. Prosthetic Consideration in Implant-supported Prosthesis: A Review of Literature. J Int Soc Prev Community Dent 2017; 7:S1-S7. [PMID: 28713760 PMCID: PMC5502545 DOI: 10.4103/jispcd.jispcd_149_17] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2017] [Accepted: 05/09/2017] [Indexed: 11/25/2022] Open
Abstract
Modern dentistry has changed tremendously with implant therapy. For the successful implant therapy, making a proper treatment plan considering both surgical and prosthetic part in mind is the key of success. Often practitioners tend to create a treatment plan overlooking the basic principles of prosthetic part. This present review has discussed various prosthetic consideration of implant-supported prosthesis. A step-by-step detailed prosthetic option with their indications has been discussed to help all dental implant practitioners in making of an optimal treatment plan for each case.
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Affiliation(s)
- Manga Snigdha Gowd
- Department of Orthodontics and Dentofacial Orthopedics, Kalinga Institute of Dental Sciences, KIIT University, Bhubaneswar, Odisha, India
| | - Thatapudi Shankar
- Department of Prosthodontics, Kalinga Institute of Dental Sciences, KIIT University, Bhubaneswar, Odisha, India
| | - Rajeev Ranjan
- Department of Periodontics and Oral Implantology, Kalinga Institute of Dental Sciences, KIIT University, Bhubaneswar, Odisha, India
| | - Arpita Singh
- Department of Public Health Dentistry, Kalinga Institute of Dental Sciences, KIIT University, Bhubaneswar, Odisha, India
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ABU HASAN MD, SHIAKOLAS PANOSS. COMPARATIVE STRESS ANALYSIS OF LINGUALIZED AND CONVENTIONAL BALANCED OCCLUSION SCHEMES IN A FULL-ARCH FIXED IMPLANT PROSTHESIS USING FINITE ELEMENT ANALYSIS. J MECH MED BIOL 2017. [DOI: 10.1142/s0219519417500749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
This study compares the biomechanical behavior of a mandibular full-arch fixed implant prosthesis with four implants under lingualized and conventional balanced occlusion schemes. The acrylic resin denture was supported by four titanium cylindrical implants and connected via a titanium prosthetic rectangular bar. Orthotropic material was used for the cortical and cancellous bones. The applied loadings were vertical and bilateral: 100[Formula: see text]N on first molar and 50[Formula: see text]N on first and second premolars each. For the lingualized balanced occlusion, the loadings were applied in central fossae of the posterior teeth, whereas for the conventional balanced occlusion the loadings were applied in central fossae and buccal cusps. The maximum von-Mises stresses for the lingualized and conventional balanced schemes were 301[Formula: see text]MPa and 25[Formula: see text]MPa, respectively, and were located at the neck of the posterior implants. In the denture teeth, the highest stress was located at the beginning of the cantilever extension. In the cortical bone, according to Tsai–Wu criterion, the failure index for the lingualized balanced occlusion was 1.10 and for the conventional balanced occlusion was 0.83. Thus, the conventional balanced occlusion demonstrated more favorable stress distribution in the implants and the cortical bone than the lingualized balanced occlusion.
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Affiliation(s)
- MD ABU HASAN
- Micro Manufacturing Medical Automation and Robotics Laboratory, Department of Mechanical Engineering, The University of Texas at Arlington, Arlington, TX 76010, USA
| | - PANOS S. SHIAKOLAS
- Micro Manufacturing Medical Automation and Robotics Laboratory, Department of Mechanical Engineering, The University of Texas at Arlington, Arlington, TX 76010, USA
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25
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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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26
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Lee JH, Kweon HHI, Choi SH, Kim YT. Association between dental implants in the posterior region and traumatic occlusion in the adjacent premolars: a long-term follow-up clinical and radiographic analysis. J Periodontal Implant Sci 2016; 46:396-404. [PMID: 28050317 PMCID: PMC5200865 DOI: 10.5051/jpis.2016.46.6.396] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Accepted: 11/02/2016] [Indexed: 11/26/2022] Open
Abstract
Purpose The aim of this retrospective study was to determine the association between dental implants in the posterior region and traumatic occlusion in the adjacent premolars, using data collected during from 2002 to 2015. Methods Traumatic occlusion in the adjacent premolars was assessed by examining clinical parameters (bleeding on probing, probing pocket depth, fremitus, and tooth mobility) and radiographic parameters (loss of supporting bone and widening of the periodontal ligament space) over a mean follow-up of 5 years. Clinical factors (gender, age, implant type, maxillary or mandibular position, opposing teeth, and duration of functional loading) were evaluated statistically in order to characterize the relationship between implants in the posterior region and traumatic occlusion in the adjacent premolars. Results The study inclusion criteria were met by 283 patients, who had received 347 implants in the posterior region. The incidence of traumatic occlusion in the adjacent premolars was significantly higher for splinted implants (P=0.004), implants in the maxillary region (P<0.001), and when implants were present in the opposing teeth (P<0.001). The other clinical factors of gender, age, and duration of functional loading were not significantly associated with traumatic occlusion. Conclusions This study found that the risk of traumatic occlusion in the adjacent premolars increased when splinted implants were placed in the maxillary molar region and when the teeth opposing an implant also contained implants.
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Affiliation(s)
- Jae-Hong Lee
- Department of Periodontology, Wonkwang University Daejeon Dental Hospital, Wonkwang University College of Dentistry, Daejeon, Korea
| | - Helen Hye-In Kweon
- Department of Periodontology, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - Seong-Ho Choi
- Department of Periodontology, Research Institute for Periodontal Regeneration, Yonsei University College of Dentistry, Seoul, Korea
| | - Young-Taek Kim
- Department of Periodontology, National Health Insurance Service Ilsan Hospital, Goyang, Korea
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27
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Lee JB, Kim MY, Kim CS, Kim YT. The prognosis of splinted restoration of the most-distal implants in the posterior region. J Adv Prosthodont 2016; 8:494-503. [PMID: 28018568 PMCID: PMC5179489 DOI: 10.4047/jap.2016.8.6.494] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 07/25/2016] [Accepted: 08/08/2016] [Indexed: 11/22/2022] Open
Abstract
PURPOSE The aim of this study was to compare the efficacies of two-implant splinting (2-IS) and single-implant restoration (1-IR) in the first and second molar regions over a mean functional loading period (FLP) of 40 months, and to propose the appropriate clinical considerations for the splinting technique. MATERIALS AND METHODS The following clinical factors were examined in the 1-IR and 2-IS groups based on the total hospital records of the patients: sex, mean age, implant location, FLP, bone grafting, clinical crown-implant ratio, crown height space, and horizontal distance. The mechanical complications [i.e., screw loosening (SL), screw fracture, crown fracture, and repeated SL] and biological complications [i.e., peri-implant mucositis (PM) and peri-implantitis (PI)] were also evaluated for each patient. In analysis of two groups, the chi-square test and Student's t-test were used to identify the relationship between clinical factors and complication rates. The optimal cutoff value for the FLP based on complications was evaluated using receiver operating characteristics analysis. RESULTS In total, 234 patients with 408 implants that had been placed during 2005 - 2014 were investigated. The incident rates of SL (P<.001), PM (P=.002), and PI (P=.046) differed significantly between the 1-IR and 2-IS groups. The FLP was the only meaningful clinical factor for mechanical and biological complication rates in 2-IS. CONCLUSION The mechanical complication rates were lower for 2-IS than for 1-IR, while the biological complication rates were higher for 2-IS. FLP of 39.80 and 46.57 months were the reference follow-up periods for preventing biological and mechanical complications, respectively.
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Affiliation(s)
- Jong-Bin Lee
- Department of Periodontology, Ewha Womans University Mokdong Hospital, Seoul, Republic of Korea
| | - Man-Yong Kim
- Department of Prosthodontics, Ilsan Hospital, National Health Insurance Service, Goyang, Republic of Korea
| | - Chang-Sung Kim
- Department of Periodontology, Research Institute for Periodontal Regeneration, College of Dentistry, Yonsei University, Seoul, Republic of Korea
| | - Young-Taek Kim
- Department of Periodontology, Ilsan Hospital, National Health Insurance Service, Goyang, Republic of Korea
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Consecutive Case Series of Healed Single-Molar Sites Immediately Restored with Wide-Diameter Implants: A 1-Year Evaluation. Int J Dent 2016; 2016:5645892. [PMID: 27195008 PMCID: PMC4852344 DOI: 10.1155/2016/5645892] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2015] [Revised: 03/03/2016] [Accepted: 03/20/2016] [Indexed: 11/18/2022] Open
Abstract
Introduction. To evaluate outcomes of wide-diameter (6 mm) implants immediately provisionalized with cement-retained single crowns in posterior molar sites. Materials and Methods. Forty-eight consecutive patients received a total of 53 moderately rough-surface, 6 mm diameter implants in healed sites. All implants were immediately provisionalized with a cement-retained provisional crown. Final prosthesis with cement-retained porcelain fused to metal crowns was delivered 3–6 months later. Patients were followed up for 1 year. Outcome measures were implant failures and success rate, complications, marginal bone levels, bone level changes, papilla index, bleeding on probing, and inflammation. Results. One patient was lost to follow-up. At one year, the implant survival and success rate were 98.1%. The mean marginal bone loss after 1 year was −0.17 ± 1.84 mm. Ideal papilla score was recorded at 83.8% of the sites. More than 95.6% of the sites showed no bleeding or inflammation. No procedure-related or device-related adverse events were reported. Conclusion. Wide-diameter (6 mm) implants can safely and successfully replace single posterior molars. Longer follow-up studies are necessary to evaluate the long-term success of these implants.
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29
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Assessment of stress distribution around implant fixture with three different crown materials. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.tdj.2015.08.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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30
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Lan TH, Liu PH, Chou MMC, Lee HE. Fracture resistance of monolithic zirconia crowns with different occlusal thicknesses in implant prostheses. J Prosthet Dent 2015; 115:76-83. [PMID: 26412004 DOI: 10.1016/j.prosdent.2015.06.021] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Revised: 06/17/2015] [Accepted: 06/24/2015] [Indexed: 11/24/2022]
Abstract
STATEMENT OF PROBLEM The use of monolithic zirconia crowns in implant prostheses is increasing, especially when the interdental space is insufficient. However, fractures have been reported in clinical practice. PURPOSE The purpose of this study was to determine the minimal thickness of a complete zirconia crown used for an implant prosthesis in the posterior dental region. MATERIAL AND METHODS Fifty complete zirconia crowns were produced using a computer-aided design/computer-aided manufacturing technique. In each group, 5 crowns of varying thicknesses (0.4, 0.5, 0.6, 0.7, and 0.8 mm) were subjected to cycles of vertical and 10-degree oblique compressive loading at 5 Hz and 300 N in a servohydraulic testing machine. Five finite element models comprising 5 different occlusal thicknesses (0.4, 0.5, 0.6, 0.7, and 0.8 mm) were simulated at 2 loading angles (0 and 10 degrees) and 3 loading forces (300, 500, and 800 N). Data were statistically analyzed, and fracture patterns were observed with a scanning electron microscope. RESULTS Cyclic loading tests revealed that the fracture resistance of the specimens was positively associated with prosthesis thickness (P<.01). Low von Mises stress values were obtained for prostheses with a minimal thickness of 0.7 mm under varying loading directions and forces. CONCLUSIONS Zirconia prostheses with a minimal thickness of 0.7 mm had a high fracture resistance and the lowest stress values. Therefore, dentists and laboratory technicians should carefully choose the optimum thickness of zirconia prostheses.
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Affiliation(s)
- Ting-Hsun Lan
- Attending Dentist, Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung Taiwan; Assistant Professor, School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
| | - Pao-Hsin Liu
- Assistant Professor, Department of Biomedical Engineering, I-Shou University, Kaohsiung, Taiwan
| | - Mitch M C Chou
- Professor, Department of Materials & Opto-electronic Science, National Sun Yat-Sen University, Kaohsiung, Taiwan
| | - Huey-Er Lee
- Professor, School of Dentistry, College of Dental Medicine, Kaohsiung, Taiwan
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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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