الفهرس 
Influence of Split bulk or Centripetal Packing Techniques Versus Bulk Placement technique on the Internal Adaptation of two Bulk-fill Resin Composites in class II cavity preparation: In vitro study
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Abstract
Daptation of two types of bulk fill resin composites; ormocer-based (admira fusion X-Tra) and non ormocer-based (X-tra fil) used to restore occluso-mesial and occluso-distal cavities using 3 different restorative techniques (bulk-fill, split-bulk, and centripetal techniques). Materials and Methods: A total number of 48 freshly extracted human molars were selected. The teeth with mesio-distal and bucco-lingual dimensions of (10-11 mm and 5-6 mm) respectively were included in this study. The selected teeth were divided into two equal groups 24 teeth each according to the type of resin composite used (A); ormocer-based bulk fill resin composite, Admira fusion X-Tra (A1) and non ormocer-based bulk fill resin composite, X-Tra fil (A2). Each group was then sub-divided into three sub-groups 8 teeth each according to the application technique of resin composite (T); bulk fill technique (T1), split-bulk technique (T2) and centripetal technique (T3). Standardized occluso-mesial and occluso-distal cavities were prepared in each tooth such that 2.5 mm of the remaining occlusal tooth structure was preserved between the both cavities. The prepared cavities were restored using one type of etch and rinse adhesive system (solobond M) followed by application of bulk fill resin composite, either admira fusion xtra or X-Tra fil resin composite