تاثير استخدام طريقة التصليب الضوئي ذي الشدة الضوئية البدئية المنخفضة في درجة حدوث التلون الحفافي لترميمات الكمبوزت على الارحاء الموقتة - دراسة سريرية-

Background & Objective: Curing shrinkage with its resulting stresses inside the restoration, and microleakage with its resulting marginal discoloration are the most important problems that face composite restorations. The new studies try to use a lot of ways to reduce it. One of these ways is using soft-start light curing. Investigate the clinicale influence of using soft start light curing method on marginal discoloration of composite restoration of primary molars. Material& methods: The study based on 15 patients age (7-9) years; each of them has on either side class two caries on lower second molars. One 7th generation of bonding system (Adhes One F, Ivoclar Vivadent) was used. Two ways of LED light curing was used (traditional start, and soft start). Evaluation of marginal discoloration was performed according to Modified United States Public Health Service (USPHS) criteria at baseline (one week), after three months, six months, and one year. Results: There were no significantly statistical differences (P<0.05) in the prevalence of marginal discoloration at (base line, 3, 6, and 12 months) between two groups of traditional and soft start light curing method. Conclusions: With the limited of this study the performance of two light curing methods of LED light curing unites were remarkably similar. The class II direct composite restoration was shown to be clinically satisfactory. There was no failure cases associated with clear visible discoloration along the margins of fillings