https://ri.ufs.br/jspui/handle/riufs/2465 Sat, 25 Apr 2026 11:28:35 GMT 2026-04-25T11:28:35Z http://ri.ufs.br:80/retrieve/f290a66d-7e18-4488-ad4a-e61d8911cd31/PRODONTO.png https://ri.ufs.br/jspui/handle/riufs/2465 https://ri.ufs.br/jspui/handle/riufs/23850 Título: Efeito da cor circundante e da espessura da amostra no potencial de ajuste de cor de um compósito monocromático Autor(es): Barros, Mariana Silva Abstract: Propose: This study evaluated the effect of surrounded shade and specimens` thickness on the color adjustment potential of a monochromatic composite. Methodology: The composite Vittra APS Unique was surrounded (dual specimens) or not (single specimens) by a control composite (shade A1D, A2D, or A3D). Single specimens of control composite were also confectioned. Opacity and whiteness index for dentistry (WID) were calculated for single specimens. Color differences between the single (ΔEab*SIMPLE)/ dual specimens (ΔEab*DUAL) and the controls were calculated. CAP was calculated based on the ratio between ΔEab* SIMPLE and ΔEab* DUAL. Results: The tested composite presented lower opacity (53 to 62% vs. 80 to 93%) and the higher WID (≈ 42 vs. 18 to 32) than controls. Irrespective of the specimens’ thickness (1.0/ 1.5 mm), the lowest values of ΔEab* SIMPLE (11.1/ 10.8) and ΔEab*DUAL (7.2/ 6.1) were observed using the surrounding shade A1D. The shade A3 yielded higher ΔEab*SIMPLE (16.4/ 17.1) and ΔEab* DUAL (11.3/ 12.3) than the A2D (ΔEab*SIMPLE = 13.4/ 14.6; and ΔEab* DUAL = 9.7/ 10.3). The specimen`s thickness significantly affected the CAP (0.35 and 0.44 for 1.0 and 1.5 mm, respectively) only for shade A1D, which had the highest CAP values. The shade A3D resulted in higher CAP values (0.31) than A2D (0.27) when 1.0-mm thick specimens were used, but similar values were observed for 1.5 thick specimens (≈ 0.29). Conclusion: Both surrounding shade and specimen thickness can affect the CAP of a monochromatic resin composite, and the highest values were observed for shade A1 and 1.0-mm thick specimens. Sat, 01 Jan 2022 00:00:00 GMT https://ri.ufs.br/jspui/handle/riufs/23850 2022-01-01T00:00:00Z https://ri.ufs.br/jspui/handle/riufs/13163 Título: Limites de perceptibilidade e aceitabilidade das alterações de cor causadas pela redução na espessura do compósito correspondente à dentina Autor(es): Santos, Sheila Mara Morais Abstract: This study aimed to determine the reduction threshold on thickness of dentin shade composite necessary to result in perceptible and acceptable color changes on simulated restorations. Three composite systems (Charisma Diamond, IPS Empress Direct, and Filtek Z350 XT) were evaluated using cylinder-shaped specimens built-up with dentin and enamel shades. Opacity of the composites was assessed using 1.0 mm thick specimens over black and white backgrounds. A baseline color was established for each system by combining 1.0 mm thick enamel shade with 3.0 mm of dentin shade cylinders over a dark background (n = 9). Then, the color changes (∆E00) caused by sequential 0.1 mm reductions on dentin shade cylinders were calculated. Opacity changes on dentin shade cylinders and combined enamel-dentin pair cylinders were also assessed after each thickness reduction. Polynomial regression was performed with averages of ∆E00 as function of thickness of dentin shade cylinders; and acceptability (∆E = 1.77) and perceptibility (∆E = 0.81) thresholds were calculated. Linear regressions were also performed for ∆E00 as function of opacity of dentin shade cylinders and combined enameldentin pair of cylinders. Except for Charisma, enamel shades presented lowest opacity than dentin one. Perceptible and acceptable color changes were observed for dentin shade cylinders thinner that 2.0-2.4 mm and 1.1-1.4 mm, respectively, were used. No difference among the composite systems were observed. In conclusion, reductions of dentin shade composite lower than 0.6-mm and 1.6-mm did not result in perceptible and clinically relevant changes, respectively, on ultimate color of simulated restorations. Tue, 21 Aug 2018 00:00:00 GMT https://ri.ufs.br/jspui/handle/riufs/13163 2018-08-21T00:00:00Z https://ri.ufs.br/jspui/handle/riufs/13161 Título: Efeito da remoção parcial de cárie no comportamento biomecânico de restaurações classe II com compósito “bulk-fill” Autor(es): Silva, Paula Fernanda Damasceno Abstract: In deep caries lesions, the maintenance of caries-affected dentin (partial caries removal) under the final restoration has been recommended to avoid additional damage to the pulp, but the effects of the presence of this more resilient dentin tissue under restoration is not yet fully elucidated. Thus, this study aimed to develop a method to induce caries in the dentin using acid challenge associated to a microcosm biofilm model, and to determine the effect of maintaining caries-affected dentin under composite restoration in its biomechanical behavior. Twenty third molars, with class I cavity preparation, were exposed to acetic acid demineralizing solution for 32 days. Afterwards, microcosm biofilm was cultured for 7 days on the demineralized dentin, under daily 6 hours regimen of sucrose. The caries-affected dentin was removed in half of the samples, while it was maintained in the others (n = 10). The proximal walls were also removed and the class II cavities restored with the composite Filtek Bulk-Fill. The deformation of the buccal and lingual cusps was evaluated by strain gauges during the restorative procedure. The presence of cracks in these cusps was also analyzed by transillumination before and after the restorative procedures. Four samples (n = 2) were used to volumetrically measure cusp deformation by differences in the images obtained before and after the restoration with micro computed tomography. Afterwards, all samples were submitted to 1,200,000 mechanical cycles and the crack propagation was analyzed; followed by fracture resistance test. Data of cusp strain and averages of crack/ tooth were submitted to two-way repeated measures ANOVA. Fisher's exact test was used to evaluate the effect of caries removal on the proportion of cracks larger and shorter than 3 mm. Data of the fracture strength were submitted to the T-test. The level of significance was set at 5% for all analyzes. Caries removal did not affect the presence and distribution of cracks, cusp deformation, and fracture strength of teeth restored with composite. The restorative procedure increased the number of cracks, which was not affected by mechanical cycling. As conclusion, maintaining caries-affected dentin under composite restorations did not affect their biomechanical behavior. Fri, 16 Feb 2018 00:00:00 GMT https://ri.ufs.br/jspui/handle/riufs/13161 2018-02-16T00:00:00Z https://ri.ufs.br/jspui/handle/riufs/13160 Título: Eficácia da crioterapia na redução da dor, edema e trismo após cirurgia de terceiros molares : revisão sistemática e meta-análise de ensaios clínicos randomizados Autor(es): Nascimento Junior, Edmundo Marques do Abstract: Third molars removal is a routine procedure in oral and maxillofacial surgery and is usually related to postoperative complications such as pain, edema and trismus, interfering in patients' quality of life. Controling postoperative inflammation then becomes important and has been performed in several ways, with cryotherapy being quite common as a supporting method. There is a lack of evidence on the efficacy of cryotherapy to control pain, edema and trismus after third molars removal. The aim of this study was to investigate this efficacy through a systematic review and meta-analysis of randomized clinical trials (RCTs). We searched PubMed, Web of Science, SCOPUS, Cochrane Central Register of Controlled Trials, ClinicalTrials.gov, Google Scholar and OpenThesis to select RCTs from inception to June 2018. The search string included cryotherapy, third molars, and wisdom teeth. The eligibility criteria were: (1) population: patients submitted to removal of impacted third molars; (2) intervention and control: postoperative cryotherapy versus no cold therapy; (3) outcomes: primary outcome was postoperative pain and secondary outcomes were facial swelling and trismus; (4) study type: RCTs. Eligible studies must had reported at least one of the outcomes of interest. Two reviewers selected studies, extracted data and assessed study quality according to Cochrane guidelines for RCTs. We used either the weighted mean difference (WMD) or the standardized mean difference (SMD) as effect measures and a 95% confidence intervals (CI). The strength of evidence was measured using the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) rating system. To calculate the effect sizes, means and standard deviations (SD) were obtained for each study group and outcome of interest. Six RCTs were included in the meta-analysis. Differences in pain intensity were found in the second (WMD -0.72, 95% CI 1.45 to 0.01, p = 0.05, I2 = 0%) and third (WMD -0.36, 95% CI % -0.59 to 0.13, p = 0.002, I2 = 0%) postoperative days. No evidence was found that cryotherapy was effective in reducing trismus and edema after third molar surgery. Despite the improvement in pain levels when cryotherapy was used, the quality of the evidence was considered low. Fri, 25 Jan 2019 00:00:00 GMT https://ri.ufs.br/jspui/handle/riufs/13160 2019-01-25T00:00:00Z