Comparative study of the surface roughness of Ormocer-based and conventional composites

Abstract

The aim of this study was to evaluate the surface roughness of two Ormocer-based resin composites before and after mechanical toothbrushing. The study compared the brands Admira and Definite with composites based on conventional monomer systems (Bis-GMA, Bis-EMA, UEDMA e TEGDMA), Z250 and A110. Eight samples of each material with 4mm in diameter and 2mm in height were prepared using a metallic mold. After 24 hours they were polished and examined with a profilometer for measurement of the initial surface roughness (Ra, mm) before mechanical toothbrushing (30,000 cycles). After toothbrushing, the samples were taken to the profilometer once again to check the final surface roughness. The results were submitted to ANOVA and Tukey test (5%). The Admira composite presented a higher mean of surface roughness before toothbrushing (0.132mm), with a statistical difference from the composite A110 (0.082mm). Definite (0.110mm) and Z250 (0.105mm) composites showed no differences between themselves or among the other composites. No statistical differences were observed after toothbrushing between the composites Definite (0.178mm), Z250 (0.187mm), Admira (0.181mm), and A110 (0.193mm). All composites showed a statistically significant increase in the surface roughness after toothbrushing.

Effects of Light Curing Modes and Resin Composites on Temperature Rise under Human Dentin: An in vitro Study

“…The other end was formed by an alkoxy group, resulting in an inorganic area, bonded to other monomers by a chemical reaction of condensation, converting the monomer precursors in a polymeric inorganic condensate -via sol-gel processing -to create a complex structure with the formation of the Si-O-Si chain in the inorganic area of the polymer [3][4][5]35) . The significantly greater temperature rise with the ormocer compared to the other products presumably resulted from the different monomer compositions, given the relatively low light transmittance of this product.…”

“…Recently, a new type of organic-inorganic hybrid dental material, known as Ormocers, was introduced as an alternative to conventional dental composites. It has been stated that the combination of organic-inorganic matrix and filler particles in high concentrations (up to 67％) in ormocers provided an improvement in some mechanical and physical properties, thereby rendering them superior to those of conventional composites [3][4][5] . An increase in demand for esthetic dental restorations has also led to a tandem increase in the use of light sources to photocure resin composites 6) .…”

Degradation resistance of silorane, experimental ormocer and dimethacrylate resin-based dental composites

“…However, such materials still incorporate some dimethacrylate monomers and so the long term stability of these materials could still be a concern. Some researchers found that ormocer-based materials (Admira and Definite) had lower abrasion resistance and higher roughness than some dimethacrylate-composite (13,14). Consequently, ormocer materials were in need of improvement.…”

A comparative study of microleakage between giomer and ormocer restoration in class I cavity of first permanent premolar teeth in vivo

“…8 It contains ceramic polysiloxane, inorganic silanated filler particles. The filler particles are 1-1.5 μm in size.…”