Shear bond strength of posterior comp-osite cores

الملخص EN

This study was designed to evaluate the shear bond strength (SBS) of posterior composite resin cores to tooth surface using two dental adhesives and two retentive means.

Thirty extracted permanent molars were used for this purpose. They were made flat by removing the occlusal one third using “stone grinding wheal”.

Teeth were then randomly divided into six groups : Groups I and IV : scotchbond Multipurpose Plus (SbMP) and All bond 2 dental adhesives were used for groups I and IV respectively to adhere composite to the flat tooth surface with no retentive mean as the control group Groups II and V : A circumferential slot was prepared and composite attached to the tooth using SbMP and All bond 2 for groups II and V respectively. Groups III and VI: Four self-threading pins were placed and composite adhered using SbMP and all bond 2 for groups III and VI respectively. After storage and thermal cycling, the SBS for each group was measured using “universal testing machine” The results varied according to the retentive mean and dental adhesive used.

Groups with four pins produced the highest SBS and groups with no retentive mean showed the lowest SBS.

Also the groups using all bond 2 adhesive generally had higher values when compared with the same groups using SbMP dental adhesive.

Within the limits of this study, it is indicated that when the highest SBS is to be achieved, then all bond 2 dental adhesive with pins should be used.