Background: The purpose of this study was to evaluate the effect of surface treatment of fiber-reinforce post and metal post of adhesion of a resin luting cement. Materials and Methods: Sixty methyl methacrylate specimens were fabricated with a customized metal rod. The samples were segregated into six groups (F1, F2, F3, M1, M2, and M3) of 10 specimens ( n = 10) each. The first three groups (F1, F2, and F3) were for fiber posts and (M1, M2, and M3) were for metal posts. The postspace preparation was done with dedicated drills supplied by the postmanufacturers to a length of 14 mm. F1 and M1 were the control groups. The posts in F2 and M2 groups were treated with airborne-particle abrasion with 70 μm Al 2 O 3 particles for 5 s at a constant distance of 20 mm, cleaned with alcohol and cemented in the postspace. The posts in the F3 and M3 groups were treated with airborne-particle abrasion followed by primer application. After cementing the posts into the postspace, the acrylic blocks were sectioned with a motor-driven jigsaw to obtain four specimens each of 3-mm thickness. These sections were then subjected to push-out tests on a universal testing machine. Results: There was a statistically significant increase in the bond strength of both fiber and metal posts to resin cement after airborne-particle abrasion with Al 2 O 3 particles and airborne abrasion followed by primer application. Conclusion: There is an increase in the bond strength of the resin cement with the prefabricated posts after the various surface treatments.

Aim: Polymethylmethacrylate (PMMA) resin is the most by and large used denture base material. Denture fractures are sequential to the flexure or impacting forces. Different nanoparticles such as titanium dioxide and silver nanoparticles have been used to improve its antimicrobial properties. There are limited data on their effect on flexural strength. The aim of the study was to assess the effect of silver nanoparticles and titanium dioxide nanoparticles addition on flexural strength of PMMA resins. Settings and Design: One hundred and thirty specimens divided into four groups: Control Group A, TiO 2 -reinforced Group B, silver nanoparticles reinforced Group C, and mixture of TiO 2 and silver nanoparticle reinforced Group D. Each reinforced group further divided based on concentrations -0.5%, 1%, 2%, and 3%. Materials and Methods: Rectangular metal models of the American Dental Association (ADA)- specified dimensions: 65 mm × 10 mm × 3 mm were used to form a mold space for the fabrication of specimens. Three-point bend test was used to determine the flexural strength of the samples after immersion in distilled water for 2 weeks. Statistical Analysis: The data collected were subjected to analysis of variance followed by post hoc Tukey’s test. Results: The comparison of the mean flexural strengths showed a statistically significant gradual decrease on increasing the concentrations of nanoparticles. Maximal flexural strength was seen in the control group and least with 3% Ag + TiO 2 Nps. The modified specimen also showed color changes. Conclusions: In an in vitro environment, addition of TiO 2 and silver decreases the flexural strength of the PMMA. It also causes visible color changes.

Introduction: Different materials and technique exist to record the functional and physiologic border of the denture. There is a need to determine which among the various materials available would accurately record the borders width and height as compared to tissue conditioner. Aim: To compare and evaluate the morphology of the denture borders produced by three different commercially available border molding materials. Materials and Methods: This in-vivo study was conducted at KAHER’s KLE VK Institute of Dental Science, Belagavi, Karnataka, India, from November 2012 to June 2013. The study included 20 patients with previous dentures. The labial flange of 20 patients with the existing maxillary denture was trimmed 2 mm short of the sulcus and border molding was done with tissue conditioner. The patients were instructed to perform routine activity with the denture and asked to report after 1 day. Three custom trays were fabricated without spacer, 2 mm short of the labial border. Border molding was carried out with low fusing compound, putty addition silicone and pattern resin. The trays were beaded at 2 mm from the depth of the vestibule and were poured with die stone. Casts were obtained and with the standardised method, the cast were sectioned into six sections. Border morphology of the sulcus was viewed under stereomicroscope and under image analyser. The statistical analysis carried out was using Statistical Package for the Social Sciences (SPSS) software version 19.0 Inc. Chicago, IL, USA. The level of significance was 95% confidence with p-value <0.05 was considered. Analysis of Variance (ANOVA) test and Bonferroni multiple posts-hoc test was used to analyse the data. Results: The descriptive analysis showed that the mean area of tissue conditioner (111590.95 µm2 ) was least, next being pattern resin (131253.30 µm2 ) followed by Low fusing impression compound (154854.20 µm2 ) and addition silicone (190968.55 µm2 ) (p-value<0.001). Conclusion: The result of the study showed that tissue conditioner was the best material that could be used for border molding followed by pattern resin and low fusing compound.

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