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- Chrcanovic, Bruno Ramos, DDS, MSc, PhD, et al.
(author)
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Retrospective study comparing the clinical outcomes of bar-clip and ball attachment implant-supported overdentures
- 2020
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In: Journal of Oral Science. - : Tokyo Nihon University School of Dentistry. - 1343-4934 .- 1880-4926. ; 62:4, s. 397-401
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Journal article (peer-reviewed)abstract
- The aim of this study was to compare the clinical outcomes of implant-supported overdentures (ODs) with either bar-clip or ball attachments. The implant, prosthesis failure, and technical complications were the outcomes analyzed in this retrospective clinical study conducted in a specialty clinic. Seventy-five patients with 242 implants supported by 76 ODs (36 maxillary, 40 mandibular) were included in the study and followed up for 88.8 ± 82.9 months (mean ± standard deviation). Bar-clip and ball attachments were used in 78.9% and 21.1% of the cases, respectively. Forty-three implant failures (17.8%) in 17 prostheses (17/76; 22.4%) were observed in this study. The average period of implant failure was 43.3 ± 41.0 months, and most of them were maxillary turned implants. The bar-clip system demonstrated more complications in the attachment parts compared to the ball attachment system. Poor retention of the prosthesis was similar between the two systems. Loss of implants resulted in the failure of 10 ODs in this study. ODs opposed by natural dentition or fixed prostheses presented with more complications. The Cox proportional hazards model did not show a significant effect on prosthesis failure for any of the factors. These findings indicated that patients with ODs need constant maintenance follow-ups to address the technical complications and perform prosthodontic maintenance regardless of the attachment system used.
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| 2. |
- Dapi N., Léonie, 1971-
(author)
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Socioeconomic and sex differences in adolescents’ dietary intake, anthropometry and physical activity in Cameroon, Africa
- 2010
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Doctoral thesis (other academic/artistic)abstract
- Background: People in Cameroon are experiencing a dietary transition characterized by changing from traditional food habits to increased intake of highly processed sweet and fatty food. The rapid change in food pattern combined with an increased sedentary lifestyle has resulted in a rather high prevalence of obesity, hypertension, cardiovascular diseases and type 2 diabetes. Nutritional intake is important during adolescence for growth spurt, health, cognitive development and performance in school. Objective: The aim of this thesis was to assess dietary intake, anthropometry and physical activity of adolescents according to sex and socioeconomic status (SES) and to investigate food perceptions of adolescents living in urban and rural areas of Cameroon. Methods: Girls and boys, 12-16 years of age, were randomly selected from schools in urban and rural areas. Food frequency questionnaire, 24-hour dietary and physical activity recalls, anthropometric measurements, qualitative interviews and a background questionnaire were used for data collection. Results: The proportion of overweight was three times higher in girls (14%) compared to boys (4%). Stunting and underweight were more common among boys (15% and 6%) than girls (5% and 1%). The prevalence of stunting was two times higher among the urban adolescents with low SES (12%) compared to those with high SES (5%). The rural adolescents had the highest proportion of stunting but more muscle that the urban adolescents. The rural adolescents ate in order to live and to maintain health. Urban adolescents with low SES ate in order to maintain health, while those with high SES ate for pleasure. More than 30% of the adolescents skipped breakfast in the urban area. Urban adolescents with high SES and girls reported a more frequent consumption of in-between meals and most food groups compared to the rural adolescents, boys and those with low SES. Over 55% of the adolescents had a protein intake below 10% of the energy (E%). Twenty-six percent of the adolescents had fat intake below 25 E%, and 25% had fat intake above 35 E%. A large proportion of the adolescents had an intake of micronutrients below the estimated average recommendation. Boys and the adolescents with low SES reported a higher energy expenditure and physical activity level than girls and the adolescents with high SES, respectively. Both under- and over-reporting of energy intake were common among the adolescents. Conclusions: The present study showed that nutrient inadequacy, stunting, underweight, as well as overweight and obesity were common among the adolescents in Cameroon. Therefore an intervention program targeting both under- and overnutrition among school adolescents is needed. Sex and socioeconomic differences also need to be considered.
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| 3. |
- Ghiasi, Peyman, et al.
(author)
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Implant and Prosthesis Failure Rates with Implant-Supported Maxillary Overdentures : A Systematic Review
- 2021
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In: International Journal of Prosthodontics. - : Quintessence. - 0893-2174 .- 1139-9791. ; 34:4, s. 482-491k
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Journal article (peer-reviewed)abstract
- Purpose: To assess the clinical outcomes of maxillary overdentures supported by dental implants by conducting a literature review. Materials and Methods: An electronic search was undertaken in March 2019. Eligibility criteria included publications reporting cases of implant-supported maxillary overdentures with follow-up information. Results: A total of 131 publications were included (1,478 overdentures supported by 6,681 implants). The mean number of attachments per overdenture was 3.8 ± 1.2 (range: 1 to 9), and a bar-clip system was used in about half of the cases. The prostheses were followed up for a mean of 47.9 ± 32.8 (range: 1 to 240) months. A total of 401 implants (6.0%) failed in 219 patients (14.8%), and 55 prostheses (3.7%) failed at a mean of 40.2 ± 53.2 (range: 6 to 240) months after placement. Most of the failures happened within the first year after placement for both implants (52.1%) and prostheses (41.8%). Patients with fewer implants per prosthesis presented higher prosthesis failure rates than patients with more implants per prosthesis. The cumulative survival rate for dental implants after 19 years was 70.4%, and for implant-supported maxillary overdentures was 79.8%. Presence of palatal coverage and/or metallic structure/reinforcement does not seem to have an influence on failure rate. Of the most commonly used attachment systems, the ball/O-ring and the Ceka were the ones with the highest rates of patients having at least one implant failure. Conclusion: Most of the prosthesis failures were due to loss of implants, and the first year was the most critical period for failures. The number of dental implants placed per patient seemed to have an impact on the occurrence of overdenture failure.
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| 4. |
- Hawthan, Mohammed, et al.
(author)
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Long-term retrospective clinical study of tooth-supported fixed partial dentures : A multifactorial analysis
- 2023
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In: Journal of Prosthodontic Research. - : Japan Prosthodontic Society. - 1883-1958 .- 2212-4632. ; 67:2, s. 238-245
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Journal article (peer-reviewed)abstract
- PURPOSE: To assess the influence of several factors on the survival of tooth-supported fixed partial dentures (FPDs) with vital and non-vital abutments.MATERIALS AND METHODS: The present retrospective cohort study was based on the records of patients treated with 3-to-7-unit tooth-supported FPDs with a minimum follow-up time of 6 months after prosthesis delivery. Cumulative survival rate (CSR) was calculated over the maximum follow-up period. Cox regression models were used to evaluate the association between the clinical covariates and prosthesis failure.RESULTS: A total of 331 FPDs in 229 patients were included. The CSRs were 90.1% and 77.6% after 5 and 10 years and 67.9% and 52.1% after 15 and 20 years, respectively. Tooth-supported FPD failure was more prevalent within the first years of prosthesis delivery. Loss of one or more abutment teeth and loss of prosthesis retention were the main reasons for failure. Smoking and type of prosthesis material significantly influenced the survival of FPDs. Abutment vitality, position of the non-vital abutment, or prosthesis length did not show any significant influence on the occurrence of prosthesis failure.CONCLUSION: Smoking and the type of prosthesis material are suggested to contribute to an increased rate of FPD failure irrespective of abutment vitality.
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| 5. |
- Hawthan, Mohammed
(author)
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On failures and complications of tooth-supported fixed prostheses
- 2023
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Doctoral thesis (other academic/artistic)abstract
- Loss of tooth structure or loss of the tooth may affect masticatory function, phonetics, a person´s appearance, and might ultimately impair quality of life. Fixed prosthetic rehabilitation in the form of either fixed dental prosthesis (FDP)or single crown (SC) is a reliable treatment alternative to restore lost functions. Tooth-supported fixed prosthetic restorations (FDPs, SCs) are influenced by multiple combined general and local factors that may affect the risk of complication and failure. Recognizing risk factors is important in treatment planning, and will help the clinician optimize treatment outcomes. This will also be beneficial for both the patient and society from a cost-effective aspect, as a reduction in complications and failures reduces costs. Several factors have been suggested to impact the survival and failure rates of FDPs and SCs, but there is still limited evidence concerning the clinical outcomes of FDPs and SCs when subjected to a combination of multiple factors in a clinical setting. The aim of the present thesis was to evaluate whether the survival and failure rates of full-coverage tooth-supported fixed prosthetic restorations (FDPs, SC) are influenced by general and/or local factors. This thesis is based on a systematic review (Paper I) and three retrospective studies (Papers II, III, and IV). In Study I, PubMed, Web of Science and ScienceDirect databases were searched and manual searches were conducted to identify clinical human studies reporting on full-coverage tooth-supported FDPs and SCs. Cumulative survival rate (CSR) was calculated over the maximal period of follow-up reported, in a life-table survival analysis. Seventeen studies fulfilled the inclusion criteria. The highest 5-year survival rate was observed for all-ceramic and metal–ceramic SCs on vital teeth 97.8% (95%CI [97.1– 98.5%]), and all-ceramic SCs on non-vital teeth with fiber post 99.1% (95% CI [97.7– 100.4%]). Metal–ceramic SCs on vital teeth 97.5% (95% CI[96.8–98.3%]) showed a statistically significant higher estimated 5-year survival rate compared to metal–ceramic SCs with cast metal post 94.5% (95% CI [93.3–95.8%], p <0.001) and fiber post 95.1% (95% CI [93.4–96.6%], p <0.007), respectively. For FDPs, the 5-year survival rate was higher for metal–ceramic FDPs on vital abutments 96.9% (95% CI [95.5–98.4%]), compared to FDPs retained by non-vital abutment(s) with cast metal posts 94.3% (95% CI [89.3–99.3%]). The difference was not statistically significant. Tooth vitality is suggested to contribute positively to the survival of SCs. The results are, however, limited by the small number of studies and the presence of uncontrolled cofounding clinical variables. In the retrospective studies II, III, and IV, dental records archives and the digital journals of all patients at the Faculty of Odontology, Malmö University, Sweden were reviewed to identify patients rehabilitated with full-coverage toothsupported FDPs and SCs. Cox regression was used to evaluate the associations between clinical covariates and prosthesis failure. The CSR was similar for FDPs and SCs after 5 years of function. CSR was higher for SCs compared to FDPs after 10, 15, and 20 years of function. Smoking, type of prosthesis material, and bruxism significantly influenced the survival of FDPs, whereas abutment vitality, position of the non-vital abutment, or prosthesis length did not show any significant influence on the occurrence of FDP failure. The survival of SC was influenced by anterior placement, non-vital abutments, and bruxism, while the patient’s age and sex, the location of the crowns in relation to the jaws, the type of tooth, the presence of post and core, and the type of crown material, treatment providers, or smoking did not show significant effects on the survival of SC.In summary, within the limitations of the review and retrospective studies, bruxism, smoking, and type of prosthesis material are suggested to contribute toFDP failure. Anterior placement, non-vital abutments, and bruxism are factors increasing the rate of SC failure.
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