Introduction:The aim of this in vitro study is to evaluate the role of light and laser sources in the bleaching ability of 37.5% H2 O2 on extracted human teeth.Materials and Methods:About 30 caries-free single-rooted maxillary central incisors were used for the study. Specimens were prepared by sectioning the crown portion of teeth mesiodistally, and labial surface was used for the study. Specimens were then immersed in coffee solution for staining. Color of each tooth was analyzed using Shadestar, a digital shademeter. Specimens were then divided into three groups of 10 each and were subjected to bleaching with 37.5% H2 O2, 37.5% H2 O2 + light activation, and 37.5% H2 O2 + laser activation, respectively. Postbleaching, the color was analyzed for all the specimens immediately and then after 1, 2, and 3 weeks intervals, respectively.Results:All the statistical analyses were done using SPSS version 17. Intra- and inter-group comparisons were done with Friedman test and Kruskal–Wallis ANOVA, respectively. Statistical analysis concluded with a significant improvement in their shade values from baseline in all the three groups. Halogen light activation and laser-activated groups showed comparatively enhanced bleaching results over no-activation group, though the difference was not statistically significant.Conclusion:The results of the present study show that bleaching assisted with halogen light and laser showed increased lightness than nonlight activated group. Durability of bleaching results obtained postbleaching was maintained throughout the experimental trail period of 3 weeks for both halogen light and laser activation group, whereas no-light activation group presented with shade rebound after 2 weeks postbleaching.
Aim:The aim of this study is to evaluate the efficacy of sublingual piroxicam as a preemptive analgesic agent in patients undergoing single implant surgery. Materials and methods: This was a prospective triple-blind placebo-controlled trial that involved 40 patients presented for the placement of a single endosteal implant in the posterior maxillary arch. Patients were randomly allocated to one of the following groups. Group I (study) who received sublingual piroxicam 40 mg 1 hour prior to the surgical procedure and group II (control) received placebo 1 hour before the surgery, both the groups received sublingual piroxicam 20 mg tablet twice a day on the first and the second postoperative day and once a day on the postoperative day 3. Visual analog scores for measuring pain intensity were assessed at postoperative 1 hour, 6 hours, days 1, 3, and 5. Facial swelling was measured and evaluated during the first, third, and fifth postoperative days using the digital vernier caliper. The Mann-Whitney U test was used to make between-group comparisons. The Wilcoxon-signed rank test was used to make within-group comparisons. Results: At all-time intervals, both mean pain and mean swelling scores were higher in controls as compared with those of cases. The difference between the two groups was also statistically significant at all-time intervals for both parameters except for pain at 1 hour. Conclusion: Our findings suggest that preoperative sublingual piroxicam is more effective for controlling postoperative pain and swelling after surgical implant placement than only postoperative administration.
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