بررسي مقايسه اي تاثير روش compostie Basing روي مقاومت به شكست دندانهاي ترميم شده با اينله پرسلن Invitro( )

This study was accomplished in order to evaluate the of composite basing technique (CB. T ) on fracture resistance of the teeth restored with porcelain inlays (in vitro). Forty sound human maxillary first premolars were divided into 4 groups. Each group included 10 teeth . samples prepared in the following manner : group 1 :prepared and restored without CB. T group 2:prepared but unrestored without C B. T group 3 :prepared and restored with CB. T group 4:prepared but unrestored with CB. T for all groups Instron universal machine were used under compressive load . 1- no significant difference were observed in fracture resistance and fracture mode between teeth that restored (group 1 & 3). 2- no significant difference were seen in fracture resistance and fracture mode between unrestored teeth ( group 2&4 ). 3- significant difference were seen in fracture resistance between restored teeth (group 1 &3) and prepared but untestored teeth (group 2& 4).