تأثير أنظمة إنهاء و تلميع مختلفة في قساوة الكمبوزيت السيلوراني و الميتاكريلاتي

Abstract EN

Background and Objective: The purpose of this study was to evaluate the effect of different finishing/polishing systems on the surface hardness of Silorane and Methacrylate based composite.

Materials and Methods: 90 cylindrical discs were prepared using a teflon mold (5mm diameter,2mm height)of two methacrylate - based composites (Filtek Z250XT-3M ESPE), (Charisma-Heraerus Kulzer),and one silorane- based composite(Filtek P90-3M ESPE), 30 specimens of each, and were light cured by ( Elipar -3M ESPE -1000 mw/cm2-20 seconds).

Specimens were stored in distilled water foe 24 h.

Each material group was divided into 3 subgroups(n=10) according to the finishing /polishing system used(Sof-lex XT Discs-3M ESPE),( Spiral Wheels- Sof-lex -3M ESPE)and(Astropol -Ivoclar Vivadent).

Surface hardness was tested using (Shore D Hardness Tester TH210- TIME).

Results were statistically analyzed by one-way ANOVA and Bonferroni tests at the significance level (p<0.05).

Results: Mean hardness values arranged as following: Z250XT > C-H Kulzer > P90 when Sof-lex XT was used.

Z250XT > P90‘ C-H Kulzer> P90 when Sof-lex Spiral Wheel was used.

and P90 > Z250XT when Astropol was used.

Conclusions: Composite surface hardness was affected be the material composition and finishing /polishing system.

Methacrylate-based composite had higher hardness value than silorane- based composite when finished by aluminum oxide -containing discs, while silorane- based composite showed higher hardness value than methacrylate-based composite when finished by rubber cups.