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Comparação de sistemas rotatórios e manuais na instrumentação dos canais mésio-vestibular e disto-vestibular de segundos molares decíduos superiores: análise por microtomografia computadorizada

Mon, 06 Jul 2026 00:00:00 GMT

Title: Comparação de sistemas rotatórios e manuais na instrumentação dos canais mésio-vestibular e disto-vestibular de segundos molares decíduos superiores: análise por microtomografia computadorizada Autor: Singer, Paulo Henrique Primeiro orientador: Hoshi, Adriano Tomio Abstract: Introduction: Maintaining primary teeth in functional condition until their natural shedding is essential for proper oral development in children. Pulpectomy is a widely recommended treatment option in cases of irreversible pulp damage resulting from extensive carious lesions or dental trauma. However, the complex anatomy of the root canals of primary teeth, especially the upper second molars, poses a significant clinical challenge during the endodontic instrumentation phase. Objectives: To compare the effects of different endodontic instrumentation systems—rotary and manual—on the mesio-buccal and disto-buccal canals of artificial upper deciduous second molars, using computed microtomography analysis. Methodology: Thirty-six artificial teeth were used, divided into three experimental groups (n=12), according to the system employed: Sequence Baby File NiTi (BF), ProDesign Logic 2 (LOGIC), and K-type manual files (MANUAL). After determining the working length, the specimens were instrumented following the manufacturers’ recommendations and subjected to computed microtomography before and after biomechanical preparation. Changes in root canal volume in the cervical, middle, and apical thirds were evaluated, as well as the loss of dentin wall thickness. The data were subjected to statistical analysis, considering a significance level of 5%. Results: the results demonstrated that all systems caused changes in the internal anatomy of the root canals, with differences in the pattern of volumetric increase and dentin wear among the groups. The BF and MANUAL systems exhibited greater volumetric changes in specific regions of the canals, while the LOGIC system demonstrated more homogeneous and conservative behavior. Regardless of the system used, greater wear was observed in the apical third of the mesio-buccal canal, indicating greater structural vulnerability in this region. Conclusion: All systems evaluated are capable of performing biomechanical preparation of root canals in deciduous teeth; however, significant differences exist regarding the preservation of remaining dentin structure, reinforcing the need for careful selection. Publisher: Universidade Estadual do Oeste do Paraná Tipo do documento: Dissertação

Concordância na avaliação da mudança de cor entre o guia de cores VITA Classical e o espectrofotômetro VITA Easyshade após o clareamento dental em consultório: uma revisão sistemática e meta análise

Thu, 02 Jul 2026 00:00:00 GMT

Title: Concordância na avaliação da mudança de cor entre o guia de cores VITA Classical e o espectrofotômetro VITA Easyshade após o clareamento dental em consultório: uma revisão sistemática e meta análise Autor: Struckel, Bárbara Brusco Primeiro orientador: Camilotti, Veridiana Abstract: Introduction: Accurate assessment of tooth color change is essential for evaluating the effectiveness of in-office bleaching procedures. Although visual and instrumental methods are widely used, the agreement between the VITA Classical shade guide and the VITA Easyshade spectrophotometer remains unclear. Objective: To systematically review the literature and perform a meta-analysis to evaluate agreement and systematic differences in color change assessment between the VITA Classical shade guide and the VITA Easyshade spectrophotometer following in-office tooth bleaching with 35% hydrogen peroxide. Methodology: The protocol was registered in PROSPERO (CRD42024476136). Searches were conducted in MEDLINE, Cochrane Library, Embase, LILACS/BBO, Scopus, Web of Science, grey literature and clinical trial registries. Randomized clinical trials (RCTs) evaluating both methods in the same participants were included. Risk of bias was assessed using the Cochrane (RoB 2.0). Agreement was evaluated using Bland Risk of Bias 2.0 Altman analysis. Differences between methods were analyzed using standardized mean differ ences (SMD) with a random-effects model. Subgroup, meta-regression and equivalence testing (TOST; ±0.30 SMD) were performed. Results: Twenty-two RCTs were included. The VITA Easyshade spectrophotometer detected significantly greater color change than the VITA Classical shade guide (SMD = 1.05; 95% confidence interval [CI]: 0.79–1.30; p < 0.00001). Bland–Altman analysis showed systematic positive bias (+3.8 ΔE*) and wide limits of agreement, indicating low agreement. No significant subgroup or meta-regression effects were observed. Sensitivity analyses confirmed robustness. Equivalence testing confirmed non equivalence. Conclusions: The VITA Classical shade guide and the VITA Easyshade spectrophotometer are not equivalent and should not be used interchangeably for assessing color change after in-office bleaching. Publisher: Universidade Estadual do Oeste do Paraná Tipo do documento: Dissertação

Efeito do ozônio medicinal sobre a eficácia clareadora e a sensibilidade dentária no clareamento de consultório: ensaio clínico cego e randomizado

Thu, 28 May 2026 00:00:00 GMT

Title: Efeito do ozônio medicinal sobre a eficácia clareadora e a sensibilidade dentária no clareamento de consultório: ensaio clínico cego e randomizado Autor: Bosco, Leonardo Dal Primeiro orientador: Camilotti, Veridiana Abstract: Post-bleaching dental sensitivity (DS) following tooth whitening with high-concentration hydrogen peroxide (HP) is a common adverse effect that can be modulated by adjuvant therapies, such as ozone therapy, due to its anti-inflammatory and analgesic properties. The aim of this parallel, blinded randomized clinical trial was to evaluate the whitening efficacy and dental sensitivity following the use of 35% HP or ozonized gas. Methodology: In the control group (HP), 35% HP was applied for 45 minutes, preceded by the application of a desensitizing agent containing 5% Potassium Nitrate and 2% Sodium Fluoride for 10 minutes. In the ozone group (OZ), ozonized gas at a concentration of 55 µg was applied for 30 minutes using a custom-made silicone tray. In both groups, the upper arch received the respective clinical protocols, while the lower arch underwent bleaching with 16% carbamide peroxide for 14 days. Results: The HP group showed a significant increase in sensitivity over time across all sessions (p < 0.05), with greater intensity during the intermediate periods of the procedure and persistence at 24 hours. The OZ group presented values consistently close to zero, with no significant variation over time. Intergroup differences were observed from the intermediate time points through 24 hours (p < 0.05), with higher values in the HP group. Regarding color, both groups showed significant change between baseline and final assessments (p < 0.05); however, the HP group demonstrated a greater magnitude of whitening (median ΔC = 7 [7–10]) compared to the OZ group (median ΔC = 1.5 [0–3]) (p < 0.001; r = 0.73). Conclusion: 35% hydrogen peroxide demonstrated superior whitening efficacy, but was associated with greater dental sensitivity. Ozone therapy alone did not show a clinically relevant whitening effect, but it resulted in the absence of tooth sensitivity during and after the procedure. Publisher: Universidade Estadual do Oeste do Paraná Tipo do documento: Dissertação

Mapeamento Tridimensional de Canais Radiculares em Raízes Mesiovestibulares de Primeiros Molares Superiores Permanentes: Estudo Retrospectivo em TCFC

Mon, 02 Mar 2026 00:00:00 GMT

Title: Mapeamento Tridimensional de Canais Radiculares em Raízes Mesiovestibulares de Primeiros Molares Superiores Permanentes: Estudo Retrospectivo em TCFC Autor: Müller, Letícia Cristina Primeiro orientador: Mendonça, Marcio José Abstract: Objective: To evaluate the prevalence of anatomical variations in the mesiobuccal (MB) root of permanent maxillary first molars and their association with sex, age group, and laterality using cone-beam computed tomography (CBCT). Methods: A retrospective study was conducted using CBCT scans obtained from a specialized dental radiology clinic in Cascavel, Paraná, Brazil, between January 2024 and January 2025. Root morphology was categorized, and the presence of anatomical variations was assessed. Data were analyzed using descriptive statistics and inferential tests (Pearson’s chi-square and Fisher’s exact test; α = 5%) with Jamovi software (v. 2.3.28). Results: A total of 100 teeth were analyzed. The prevalence of the mesiopalatal (MP) canal was 66%, with a predominance of independent apical foramen. No statistically significant association was found between anatomical variations and sex. Age group was significantly associated only with the presence of intercanal communication (p = 0.016), which was more frequent in younger individuals. Laterality showed a significant association exclusively with the presence of isthmus between teeth 16 and 26 (p = 0.026). Conclusion: The high anatomical complexity of the MB root reinforces the importance of CBCT as a complementary tool in endodontic planning, contributing to improved diagnostic accuracy, treatment predictability, and effective root canal system disinfection. Publisher: Universidade Estadual do Oeste do Paraná Tipo do documento: Dissertação