Abstract
BackgroundThe clinical use of composite resins has increased substantially due to increased esthetic demands by patients, improvements in formulation, and simplification of bonding procedures. Use of surface sealants is recommended to improve surface smoothness of composite restorations. The aim of this study was to evaluate the effect of surface sealants on the surface roughness of nano-hybrid composite after polishing with One-Step system.Material and MethodsUsing a silicon mold, 56 specimens of 10 mm diameter and 2 mm height were prepared from Grandio nano-hybrid composite (Voco, Cuxhaven, Germany) with A2 shade. Specimens were randomly divided in 2 groups. The surface of specimens were polished with VOCO One-step system. One group of specimens assigned as control group and received no more surface treatment. Surface sealant PermaSeal (Ultradent, USA) was applied on the surface of specimens of the other group as experimental group. Specimens were stored in Ringer’s solution at 37°C for 24 hours. The specimens were subjected to artificial accelerated aging with thermocycling method (3000 cycles, between 5 and 55°C) and then 100000 cycles of tooth brushing. A Profilometer was used to measuring the surface roughness of specimens before and after aging procedures.ResultsThe surface roughness changes of control group were significant before and after aging (P<0.05). The mean final surface roughness of control group was unacceptable clinically while it was acceptable in experimental group.ConclusionsThe use of surface sealants on nano-hybrid composite causes noticeable reduces in surface roughness of composite. Key words:Surface-penetrating sealant, surface roughness, nano-hybrid, composites, one-step polishing.
Highlights
The advent of acid-etch technique (Buonocore, 1955), followed by the introduction of Bisphenol A Di Glycidyl Methacrylate (Bis-GMA) composite resins (Bowen, 1956), was undoubtedly a major step in adhesive dentistry [1]
Samples of the experimental group entered the study for examining the surface roughness after one-step polishing and applying the surface sealant during artificial aging processes and the control group samples were included for studying surface roughness after a one-step polishing during the artificial aging process
The value of P=0.025 was obtained using the independent t-test for the changes in surface roughness from baseline to the final stage for the control group
Summary
The advent of acid-etch technique (Buonocore, 1955), followed by the introduction of Bis-GMA composite resins (Bowen, 1956), was undoubtedly a major step in adhesive dentistry [1]. The restoration roughness and surface absorption of oral fluids can allow colorant factors to penetrate into the material [4] To overcome this problem, the use of a thin layer of resin, with a low viscosity and high moisturizing ability, has been recommended for polymerizing restorations, including Bis-GMA, UDMA and TEG-DMA without filler particles. Surface-penetrating sealant or rebound agent should be able to fill the structural micro defects and micro fissures formed during the insertion, finishing and polishing techniques with the capillary effect This approach is thought to improve surface smoothness by providing a more uniform and organized surface [1,5,10]. The aim of this study is to determine the effect of surface sealant on surface roughness of a nano-hybrid composite after polishing with a one-step system under aging processes in the in-vitro environment. Conclusions: The use of surface sealants on nano-hybrid composite causes noticeable reduces in surface roughness of composite
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