This study aimed to evaluate the influence of dental adhesive color on the chromatic stability and fluorescence intensity of composite resin restorations of different thicknesses. Ninety bovine enamel samples were obtained and restored with resin composite varying thicknesses of restorative material and enamel (1.0 mm enamel and 1.0 mm composite; 1.5 mm enamel and 0.5 mm composite; 0.5 mm enamel and 1.5 mm composite). The restorations were made of composite resin (Opallis E-bleach H) using different types of dental adhesives: Ambar, Ambar APS, and Single Bond Universal (n=10). The samples were subjected to color measurement tests in a spectrophotometer using CIEDE2000 and fluorescence intensity measurements before and after aging in a red wine coloring solution. Data were subjected to analysis of variance (ANOVA) and Tukey's test (α = 0.05). There were no statistically significant changes in color stability or fluorescence intensity for restorations made of different materials or thicknesses (p>0.05). Single Bond Universal showed greater color stability at 0.5 mm thickness (ΔE00 = 4.4 ± 1.6) compared to other thicknesses of the same material (p=0.003), as well as a greater difference in fluorescence intensity after aging at 1.5 mm thickness (-414.9 ± 103.8) compared to other materials (p=0.0002). Overall, it was concluded that the different adhesive systems did not influence the color stability and fluorescence of restorations of different thicknesses.

To produce prostheses through the digital flow, it is essential to transfer the correct patient’s interocclusal relationship to the digital software program, enabling the articulation of virtual models. Therefore, the aim of this study was to carry out a narrative literature review to describe and discuss aspects related to the virtual occlusal record realization, as well as its precision and accuracy in different clinical situations. Searches for scientific publications were performed in different databases and only articles in English related to the topic were selected. Different methods for the alignment of virtual models are described in the literature, the main one being the scanning of the patient in occlusion, usually in a position of maximum intercuspation. However, this technique may demonstrate disagreement with the patient's actual occlusal relationship due to several factors, and therefore studies were carried out to verify the precision and accuracy of these records. Most studies use plaster models and industrial scanner to capture the record, with few studies performed with intraoral scanner in patients. Despite the various scanner systems available and the different ways of evaluating them, in general, the studies show an adequate precision and accuracy of virtual occlusal records of dentate models. However, the absence of dental elements is related to the lower accuracy of these records, it being necessary to establish an appropriate method of scanning for these clinical situations.

This study aimed to evaluate the effects of experimental bioactive glass solutions on dentinal fluid flow and hydraulic conductance in vitro. Dentin blocks of 50 bovine incisors were divided into 5 groups according to the desensitizing agent used (n = 10): Group 1—control (no treatment); Group 2—Bioglass^® 45S5; Group 3—Bioglass^® F18; Group 4—Biosilicate gel; Group 5—Desensibilize Nano P (FGM). Treatments were applied for 20 min daily over 15 days. The specimens were subjected to a citric acid challenge to simulate oral demineralizing conditions. Dentinal fluid flow and hydraulic conductance were evaluated before and after the desensitizing procedures and the acidic challenge. Scanning electron microscopy (SEM) provided qualitative dentin surface analysis. Dentinal fluid flow and hydraulic conductance data were analyzed by two-way repeated measures ANOVA and Tukey’s test (α = 0.05). The control group showed the highest dentinal fluid flow and hydraulic conductance values after the acid challenge (p < 0.05). After product application, Bioglass^® 45S5 and Bioglass^® F18 showed the lowest dentinal fluid flow (0.463 ± 0.124 Lp and 0.549 ± 0.239 Lp, respectively) and hydraulic conductance values (0.025 ± 0.007 Lp and 0.026 ± 0.007 Lp, respectively), differing significantly from Biosilicate Gel and Desensibilize Nano P (p < 0.0001). Biosilicate Gel and Desensibilize Nano P showed higher dentinal fluid flow (0.864 ± 0.180 Lp and 0.840 ± 0.173 Lp, respectively) and hydraulic conductance values (0.047 ± 0.010 Lp and 0.046 ± 0.009 Lp, respectively) after application (p < 0.0001). After the acid challenge, no significant differences were observed among the groups (p > 0.05), although all experimental groups showed numerically lower values than the control group. Bioactive glass-based desensitizing agents reduced dentinal fluid flow and hydraulic conductance, suggesting dentinal tubule occlusion. Bioglass^® 45S5 and Bioglass^® F18 showed the most stable performance, maintaining lower values even after the acid challenge, suggesting potential for the management of dentin hypersensitivity.

This study aimed to evaluate the bond strength between relined fiberglass posts with different composite resin opacities in different thirds of the intraradicular dentin. Thirty single-rooted premolars were endodontically treated and divided into three groups (n=10): fiberglass posts relined with translucent composite resin, fiberglass posts relined with opaque composite resin, and fiberglass posts without relining. After cementation of the posts, the specimens were cut perpendicular to the long axis of the tooth in slices of approximately 1.3 mm of each third to be analyzed (cervical, middle, and apical) and then subjected to the push-out test. The bond strength (MPa) data were subjected to Shapiro-Wilk normality tests and two-way repeated measures analysis of variance, considering the experimental groups and different regions as study factors. Tukey’s post-hoc test (p<.05) was applied for comparisons between the groups. In the cervical third, higher values of bond strength were found for the group relined with translucent resin, with a statistically significant difference for the other groups. In the other regions, both opaque and translucent resins showed similar results, but both showed higher values of bond strength compared to fiberglass posts without relining. The bond strength of fiberglass posts to different thirds of intraradicular dentin is influenced by composite resin relining as well as the opacity of the resin. The use of translucent composite resin is a more effective alternative for fiberglass posts relining.