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Estudo Retrospectivo Longitudinal com Acompanhamento de 13 Anos de Overdentures Mandibulares Retidas por O-ring

2026-07-07T13:17:55Z

Title: Estudo Retrospectivo Longitudinal com Acompanhamento de 13 Anos de Overdentures Mandibulares Retidas por O-ring Autor: Persch, Mônica Cavalheiro Primeiro orientador: Mendonça, Marcio José Abstract: Research question: Does the angulation between mandibular implants influence the need for prosthetic maintenance in O-ring–retained overdentures, and does it affect patients’ quality of life and perception? Introduction: The influence of interimplant angulation on the prosthetic maintenance of O-ring–retained mandibular overdentures, as well as its potential impact on quality of life and patient perception, remains unclear in long-term clinical studies. Objective: To evaluate whether interimplant angulation influences prosthetic maintenance in O-ring– retained mandibular overdentures and to analyze its relationship with patients’ quality of life and self-perception. Materials and Methods: This longitudinal retrospective study (2012– 2025) analyzed records of patients rehabilitated with mandibular overdentures retained by two implants (n = 35). Interimplant angulation was measured radiographically and analyzed as a continuous variable. The number of O-ring replacements and prosthetic adjustments during follow-up were recorded. Quality of life and patient perception were assessed using the OHIP- EDENT and SATO instruments in a chairside sub-sample (n = 20). Associations among variables were analyzed using non-parametric tests, specifically Spearman’s correlation coefficient, with a significance level of 5%. Results: The most frequent prosthetic maintenance event was O-ring replacement, with an approximate mean frequency between 0.5 and 1.0 replacement per year of use. Statistical analysis showed no significant association between implant angulation and the number of O-ring replacements or the need for prosthetic adjustments (weak correlation; |ρ| < 0.30; p > 0.05). In the evaluated sub-sample, prosthetic satisfaction scores (SATO) were high, predominantly ≥ 85, while quality-of-life scores (OHIP- EDENT) indicated low negative impact, with no significant correlation with the degree of implant angulation (p > 0.05). Conclusion: O-ring–retained mandibular overdentures demonstrated long-term functional stability, predictable maintenance needs, and no significant influence of implant angulation on clinical performance over the evaluated period. Clinical Implications: These findings support O-ring–retained mandibular overdentures as a reliable therapeutic option, even in the presence of small angular variations between implants, and provide practical guidance for treatment planning, clinical execution, and patient counseling regarding longevity and maintenance. Publisher: Universidade Estadual do Oeste do Paraná Tipo do documento: Dissertação

Avaliação do canal mésio-vestibular de molares decíduos prototipados após a instrumentação manual e rotatória

2026-04-14T18:21:40Z

Title: Avaliação do canal mésio-vestibular de molares decíduos prototipados após a instrumentação manual e rotatória Autor: FERRARI, Helena Irene Primeiro orientador: Hoshi, Adriano Tomio Abstract: The preservation of primary teeth until physiological exfoliation is essential for proper oral development in children. Endodontic treatment is indicated in cases of pulpal involvement, and root canal instrumentation remains one of the main challenges, particularly due to the complex root canal anatomy. Rotary systems specifically designed for primary teeth have been introduced as an alternative to improve clinical efficiency. The aim of this study was to evaluate volumetric changes and root canal wall wear in prototyped primary teeth following instrumentation with manual files and two rotary systems, including one specifically designed for primary teeth, using micro-computed tomography. Thirty-six prototyped maxillary second primary molars were used and divided into three groups (n = 12) according to the instrumentation technique: manual K-files (MANUAL), ProDesign Logic 2 (LOGIC), and Sequence Baby-File (SBF). The specimens were scanned using micro-computed tomography before and after instrumentation to measure canal volume and dentin wall thickness in the mesiobuccal root canal. Data were analyzed using BioEstat 5.3 software. Shapiro–Wilk, ANOVA, and Tukey tests were applied for volumetric analysis, while Kruskal–Wallis and Dunn tests were used for dentin wall thickness, with a significance level set at 5%. Canal volume increase was higher in the MANUAL group (21.0%), followed by SBF (17.9%) and LOGIC (12.0%), with a significant difference between MANUAL and LOGIC (p < 0.05). Regarding dentin wall thickness, no statistically significant differences were observed among the systems; however, greater dentin wear was observed in the apical third across all groups. All three systems demonstrated similar performance in preserving root canal wall thickness and promoting canal volume increase. Publisher: Universidade Estadual do Oeste do Paraná Tipo do documento: Dissertação

Associação entre perda de inserção periodontal, infecções relacionadas à assistência à saúde e mortalidade em pacientes hospitalizados em unidade de terapia intensiva: estudo transversal

2025-10-10T13:27:34Z

Title: Associação entre perda de inserção periodontal, infecções relacionadas à assistência à saúde e mortalidade em pacientes hospitalizados em unidade de terapia intensiva: estudo transversal Autor: Pase, Marilia Primeiro orientador: Nassar, Patricia Oehlmeyer Abstract: Healthcare-associated infections (HAIs) have a significant impact on patients admitted to intensive care units (ICUs), contributing to prolonged hospitalization, elevated healthcare expenditures, and increased mortality rates. Periodontitis has been associated with certain systemic diseases, since the inflammatory response is not limited to the periodontal tissues and can disseminate through the vascular system. In hospitalized patients, there is an higher risk of periodontal pathogen proliferation, potentially representing a critical step in the systemic dissemination of bacteria. The objective of this study is to evaluate the association between periodontal inflammation, HAIs and mortality in intubated patients, hospitalized in the ICU. Methodology: This is an observational cross-sectional study with a quantitative data analysis. Data collection was conducted in the ICU of a reference hospital at the Paraná’s western region. The included patients were under mechanical ventilation via an orotracheal tube, for a period ranging from 24 to 72 hours. The periodontal clinical examination and a gingival crevicular fluid collection were performed. Patient data and laboratorial test results were collected from the electronic medical record system, and the HAIs diagnoses were provided by the hospital. The data were presented through descriptive parameters. Continuous and discrete quantitative variables were analyzed using the Student’s t-test for unpaired samples. The variables that did not show a normal distribution (assessed by the Shapiro-Wilk test and Q-Q plot) were analyzed using the non-parametric Mann-Whitney test. Nominal qualitative variables related to sample characteristics, clinical conditions, and periodontal diagnosis were evaluated using the chi-square test. The logistic regression method was used to determine if periodontal variables and HAIs could predict the risk of mortality. The study sample comprised 50 patients. Results: The average age of patients who were discharged was of 48.3 ± 15.6 years old, while those who progressed to death had an average age of 61.1 ± 17.0 years old, with this difference being statistically significant. The loss of periodontal attachment in the 3-4 mm range was significantly greater in the group of patients who progressed to death (6 ± 7) compared to the group that was discharged (3 ± 7), with p = 0.021. The attachment level ≥ 3 mm was identified as a significant predictor for mortality. Conclusion: Mortality is associated with advanced age and with periodontal attachment loss of 3–4 mm, compared to younger patients with less periodontal involvement. Furthermore, the presence of HAIs and attachment loss ≥3 mm increase the risk of death. Publisher: Universidade Estadual do Oeste do Paraná Tipo do documento: Dissertação

Avaliação clínica do impacto da associação entre Fibrina rica em plaquetas avançada A- (PRF) e laserterapia de baixa potência (TLBP) na área doadora palatina após remoção de enxerto de tecido conjuntivo subepitelial: estudo clínico randomizado e cego

2025-08-13T12:35:45Z

Title: Avaliação clínica do impacto da associação entre Fibrina rica em plaquetas avançada A- (PRF) e laserterapia de baixa potência (TLBP) na área doadora palatina após remoção de enxerto de tecido conjuntivo subepitelial: estudo clínico randomizado e cego Autor: Pereira, Juliana Reuter Primeiro orientador: Nassar, Carlos Augusto Abstract: The subepithelial connective tissue graft (SCTG) harvested from the hard palate, although effective, causes significant postoperative discomfort and impacts quality of life. Advanced platelet-rich fibrin (A- (PRF)) and low-level laser therapy (LLLT) have been proposed as adjuncts to optimize tissue repair and reduce morbidity. Objective: This study aimed to evaluate healing, pain, and quality of life after SCTG harvesting, comparing the use of A- (PRF) alone or combined with LLLT. Materials and Methods: Thirty patients with gingival recession underwent root coverage surgery with SCTG. The graft was harvested from the palatal region, where one A - (PRF) membrane was applied. Patients were allocated into two groups: A- (PRF) + LLLT group (A - (PRF) combined with a laser protocol) and A- (PRF) group (A- (PRF) alone). Follow-up was conducted over 90 days. Healing was assessed through standardized photographs using the Modified Manchester Scar Scale (MSS) and wound area measurement. Postoperative pain was evaluated using the Visual Analog Scale (VAS), and quality of life using the OHIP-14 questionnaire. Statistical analysis: Data were analyzed using paired t-test, Mann–Whitney, Kruskal–Wallis, Friedman, Durbin–Conover, and Fisher’s exact test (p < 0.05). Results: Results showed that the A- (PRF) + LLLT group experienced greater pain on postoperative day 5 (VAS 3.20 vs. 1.13; p = 0.0061), but consistently better quality of life scores (OHIP-14) at all-time points (p < 0.05). Although both groups achieved complete healing, the A- (PRF) group presented better aesthetic outcomes (p < 0.05 for total score, contour, and distortion at certain time points). No significant differences were found in wound area or tissue thickness between groups. Conclusion: It is concluded that, under the adopted protocol, both therapies were safe and effective for palatal donor site healing, promoting progressive wound reduction, preservation of tissue thickness, and absence of complications. The adjunctive use of LLLT did not result in clinically significant additional benefits compared to A- (PRF) alone, except for a perceived improvement in patient-reported quality of life. Publisher: Universidade Estadual do Oeste do Paraná Tipo do documento: Dissertação