00000ctm a22000003a 4500 UP-1685523046126318258 Buklod 20170519154108.0 m |o d | cr ||||||||||| 170519s xx d r |||| u| (iLib)UPMNL-00015383219 UPDent eng LG 993.5 2016 D4 A37 Aquino, Marjorie Christy A. Comparison of enzymax pax and sodium hypochlorite as dental unit waterline disinfectant in UPCD clinics Marjorie Christy A. Aquino, Tiffany Joy S.Chan, Anjo S. Remolacio; Elizabeth G. De Castro, Faculty Co-Author. 44 leaves. Seminar Paper--Doctor of Dental Medicine--University of the Philippines Manila. INTRODUCTION:One-step, self-etch adhesives (SEA) have become increasingly popular because of the simplified application technique. Furthermore, SEAs are reported to perform comparatively to etch-and-rinse (ER) and self-etch primer (SEP) systems. The ability of SEA systems to perform as well as the other systems in vivo can be attributed to several factors including surface pretreatment with 37% phosphoric acid. The present study compared the enamel and dentin SBS of a SEA system following the manufacturer?s instruction and the same SEA with surface pretreatment using 37% phosphoric acid prior to application. METHODS: 40 bovine mandibular incisors were ground flat to obtain enamel and dentin substrates. A one-step SEA (3M Single Bond Universal Adhesive) was applied with and without preliminary acid etching to both enamel and dentin. The prepared specimens were equally and randomly assigned to 4 groups as follows: group 1 (enamel unetched), group 2 (enamel etched), group 3 (dentin unetched) and group 4 (dentin etched). Composite cylinders (3M Filtek Z250XT) were bonded onto the treated tooth structure. The shear bond strength was evaluated after 24 hours of storage (room temperature) with a testing machine (Shimadzu Autograph AG-X) at a speed of 1 mm/min. The data was analyzed using a one-way ANOVA with a significance level of p<0.05. RESULTS:Preliminary acid etching resulted in higher mean SBS for both enamel and dentin substrates. However, data analysis using one-way ANOVA showed that the differences are not statistically significant.The higher bond strength values on etched enamel can be explained by an increase in enamel porosity which leads to increased resin tag formation and micromechanical retention. At dentin, histologic findings show that 37% phosphoric acid results in removal of smear layer and demineralization of dentin surface which contribute to improved bond strength due to the formation of resin tags and thick hybrid layer. CONCLUSION: Preliminary acid etching of enamel and dentin prior to application of a one-step SEA (3M Single Bond Universal Adhesive) could increase the mean SBS, but the increase is not statistically significant. KEYWORDS: one-step self-etch adhesive, composite, shear bond strength, etching,bovine teeth Sodium hypochlorite. Enzymax pax. Disinfectant. Dental Unit Waterlines (DUWL). Chan, Tiffany Joy S. Remolacio, Anjo S. De Castro, Elizabeth G. UPMNL DENT LG 993.5 2016 D4 A37 Thesis