Bone regeneration is an important objective in clinical dental practice and has been used for different applications. The aim of this study was to evaluate the effectiveness of platelet-rich plasma (PRP) and bioactive glass (BG) for bone healing of surgical calvarial defects in rabbits. Two 8-mm defects were prepared in the parietal bones of ten animals, and the animals were randomly assigned to two groups. In each group, two subgroups were created with five defects each: BC - blood clot, BG, PRP and PRP + BG. Thus, four treatments were performed with five specimens each. The animals were sacrificed after 12 weeks and the specimens were analyzed radiographically, histologically and histomorphometrically. Data were subjected to ANOVA and Tukey's tests (α = 0.05). Outcomes demonstrated that the PRP group had higher bone density (%) values than the groups not treated with PRP (P < 0.05). Histometrically, both groups treated with PRP (PRP: 25.6 ± 9.9; PRP+BG: 25.8 ± 12.4) demonstrated higher percentages of new bone formation than the groups not treated with PRP (BG: 6.1 ± 4.3; BC: 7.8 ± 5.6) (P < 0.05). The results suggested that PRP improved bone repair and that bioactive glass alone, or in association with PRP, did not improve bone healing.

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Aim: The aim of the study was to investigate levels of Dental Fear (DF) and Dental Anxiety (DA) among individuals awaiting appointments at the clinics of two courses in dentistry and determine the impact on oral health status and quality of life. Methods: An observational study was conducted with a sample of adult dental patients. Levels of DF and DA and the perception of quality of life were determined using questionnaires and periodontal data. Results: Among the 287 subjects, 71.4% were female, 7.3% were classified as very anxious and 16% were classified as anxious. Gender was significantly associated with DA (p = 0.001); 20% of the female volunteers and 6.1% of the males were classified as anxious. The frequency of moderate and extreme fear was 42.9% and was not significantly correlated with gender (p = 0.071). The prevalence of a negative impact from oral health status on quality of life (measured using the OHIP-14 scale) was 38.3% and income was significantly associated with this outcome (p = 0.000). Conclusion: Levels of DA and DF were substantial among the individuals analyzed. Women with a lower education were susceptible to anxiety. DA and DF were  associated with periodontal status or impact on quality of life.

Background:The radiopacity of contemporary adhesive systems has been mentioned as the indication for replacement of restorations due to misinterpretation of radiographic images.Aims:This study aimed to evaluate the radiopacity of contemporary bonding agents and to compare their radiodensities with those of enamel and dentin.Methods and Materials:To measure the radiopacity, eight specimens were fabricated from Clearfil SE Bond (CF), Xeno V (XE), Adper SE Bond (ASE), Magic Bond (MB), Single Bond 2 (SB), Scotchbond Multipurpose (SM), and gutta-percha (positive control). The optical densities of enamel, dentin, the bonding agents, gutta-percha, and an aluminium (Al) step wedge were obtained from radiographic images using image analysis software.Statistical Analysis:The radiographic density data were analyzed statistically by analysis of variance and Tukey's test (α =0.05).Results:Significant differences were found between ASE and all other groups tested and between XE and CF. No statistical difference was observed between the radiodensity of 1 mm of Al and 1 mm of dentin, between 2 mm of Al and enamel, and between 5 mm of Al and gutta-percha. Five of the six adhesive resins had radiopacity values that fell below the value for dentin, whereas the radiopacity of ASE adhesive was greater than that of dentin but below that of enamel.Conclusion:This investigation demonstrates that only ASE presented a radiopacity within the values of dentin and enamel. CF, XE, MB, SB, and SM adhesives are all radiolucent and require alterations to their composition to facilitate their detection by means of radiographic images.