Abstract
Materials and Methods Seventy LDS specimens were randomly divided into seven groups. The first group was noncontaminated surface (PC). The six other groups were contaminated with the saliva and silicone disclosing medium and treated with no surface cleansing agent (NC); phosphoric acid (PO); Ivoclean (IV); sodium hydroxide solution (NA); Restorative Cleansing Agent (RC); and hydrofluoric acid (HF). Then, LDS specimens were cementated with Panavia V5 to resin composite rod. Each specimen was subjected to an SBS test. The modes of failure was inspected under light microscope. The surface element of each group was examined by SEM-EDS. Results The results were analyzed with one-way ANOVA and Tamhane's T2. The mean SBS value of NC was significantly lower than others (p < 0.05), and HF was significantly higher than others (p < 0.05). However, PC, PO, IV, NA, and RC were not significantly different from each other (p > 0.05). The mode of failure was mostly adhesive failure in every group. The surface showed similar amount of elements in every group. Conclusions The SBS of LDS was reduced by saliva and silicone disclosing medium contamination which can be restored using acid- and alkaline-based surface cleansing agents before the cementation procedure.
Highlights
Nowadays, esthetics is one of the factors in material selection for dental restorations
The specimens were placed in the polyvinyl chloride (PVC) tubes and bonded with self-cured acrylic resin (Unifast Trad, GC Corporation, Tokyo, Japan). e embedded ceramic specimens were polished with 600-grid metallographic abrasives using a Nano 2000 polisher (Pace Technologies, Arizona, USA) under hydraulic pressure for 1 minute and immersed in an ultrasonic bath for 15 minutes
All debonded specimens were analyzed with a light microscope (SZ-61, Olympus, Tokyo, Japan) using 25X magnification to grossly categorize the modes of failures into 3 types as follows: (1) Adhesive: the failure occurred at the interface between two different surfaces
Summary
Esthetics is one of the factors in material selection for dental restorations. The advantage of LDS over other materials is that it has extremely low fracture rates It can withstand a ration fatigue of 1 million cycles at loads of 1,000 N [2]. E purpose of this study was to investigate the efficacy of different surface cleansing agents on the shear bond strength (SBS) of contaminated LDS. E six other groups were contaminated with the saliva and silicone disclosing medium and treated with no surface cleansing agent (NC); phosphoric acid (PO); Ivoclean (IV); sodium hydroxide solution (NA); Restorative Cleansing Agent (RC); and hydrofluoric acid (HF). E SBS of LDS was reduced by saliva and silicone disclosing medium contamination which can be restored using acid- and alkaline-based surface cleansing agents before the cementation procedure Conclusions. e SBS of LDS was reduced by saliva and silicone disclosing medium contamination which can be restored using acid- and alkaline-based surface cleansing agents before the cementation procedure
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