The purpose of this study was to assess the prevalence and distribution of dental caries and periodontal disease in Taiwanese high school students aged 15–18. A total of 1069 Taiwanese students participated in a cross-sectional nationwide dental survey. By using a stratified method based on the National Health Insurance administration regions, 24 high schools were randomly sampled in different areas of Taiwan. The participants were examined with dental mirrors and community periodontal index (CPI) probes without using radiographs, to measure dental caries and periodontal status. Demographic information and other relevant risk indicators for the two diseases were gathered via a self-report questionnaire. In this study population, the weighted mean decayed, missing and filled teeth (DMFT) scores for ages 15 to 18 were 5.2, 6.1, 6.1, and 5.7. The weighted mean decayed, missing and filled surfaces (DMFS) scores were 9.0, 12.0, 13.1, and 11.2 at ages 15, 16, 17, and 18, respectively. Additionally, 88.2% of the subjects had periodontal disease, with calculus as the most prevalent type. Moreover, 5.2% of these students showed loss of attachment. There was no significant association between dental caries and periodontal disease. Dental caries and periodontal disease were prevalent among Taiwanese high school students in this national dental survey.

Objectives: This study aimed to evaluate the 28‐year cumulative success and survival rates of tissue‐level implants placed by a periodontist in Taiwan. Materials and Methods: In this retrospective cohort study, 685 tissue‐level implants placed in 199 patients between 1996 and 2024 were analyzed. A success was defined as the absence of probing depth (PD) ≥ 5 mm nor implant loss—while survival referred to the presence and clinical function of the implant. Kaplan–Meier analysis was used to estimate cumulative rates at both implant and patient levels. Potential risk factors, including patient demographics, smoking status, implant characteristics, periodontal status, and frequency of maintenance visits, were examined using Cox proportional hazards regression models. Results: At 28 years, the cumulative success rates were 71.00% at the implant level and 38.02% at the patient level, while the survival rates were 92.58% and 81.38%, respectively. Multivariable regression analysis identified male and severe periodontitis as significant predictors of peri‐implant disease or implant loss. In contrast, more frequent maintenance visits were protective. Treatment outcomes for peri‐implantitis were variable and difficult to predict. Conclusions: Tissue‐level implants demonstrated favorable long‐term clinical performance in a Taiwanese population, with success and survival rates comparable to those reported in Western cohorts. These findings underscore the importance of periodontal health and regular maintenance care in sustaining implant longevity.

This study aimed to evaluate the 28-year cumulative success and survival rates of tissue-level implants placed by a periodontist in Taiwan. In this retrospective cohort study, 685 tissue-level implants placed in 199 patients between 1996 and 2024 were analyzed. A success was defined as the absence of probing depth (PD) ≥ 5 mm nor implant loss-while survival referred to the presence and clinical function of the implant. Kaplan-Meier analysis was used to estimate cumulative rates at both implant and patient levels. Potential risk factors, including patient demographics, smoking status, implant characteristics, periodontal status, and frequency of maintenance visits, were examined using Cox proportional hazards regression models. At 28 years, the cumulative success rates were 71.00% at the implant level and 38.02% at the patient level, while the survival rates were 92.58% and 81.38%, respectively. Multivariable regression analysis identified male and severe periodontitis as significant predictors of peri-implant disease or implant loss. In contrast, more frequent maintenance visits were protective. Treatment outcomes for peri-implantitis were variable and difficult to predict. Tissue-level implants demonstrated favorable long-term clinical performance in a Taiwanese population, with success and survival rates comparable to those reported in Western cohorts. These findings underscore the importance of periodontal health and regular maintenance care in sustaining implant longevity.