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Shear bond strength of bis-acryl composite provisional material repaired with flowable composite
Mark S Hagge1, James S Lindemuth, Ammon G Jones
1University of the Pacific School of Dentistry, San Francisco, California, USA. mhagge@sf.uop.edu
Background:
Time and expense are considerable when refabrication of a bis-acryl composite provisional prosthesis is required, so an effective method of repair is desirable. Attempts at self-repair have been ineffective, and no reports of repair specific to bis-acryl composites were found in the literature.
Purpose:
To investigate the strength of a bis-acryl composite repair using flowable composite after two surface treatments and three storage conditions.
Materials And Methods:
Thirty specimens of bis-acryl composite were made and divided into six groups. Half of the specimens received air abrasion only, and half received air abrasion followed by application of an intermediate bonding resin. A flowable composite was then applied to all specimens. Following three different storage conditions, the flowable composite was debonded using a universal testing machine in tensile mode.
Results:
All specimens failed cohesively within the bis-acryl composite rather than at the repair interface. Surface treatment with air abrasion alone resulted in significantly higher shear bond strength values than when air abrasion and intermediate bonding resin were combined. Bond strength values were significantly higher in thermocycled specimens than in air-dried specimens.
Conclusions:
Use of air abrasion followed by application of flowable composite proved to be a successful technique for bis-acryl composite repair.
Clinical Significance:
Repair of bis-acryl composite provisional material with a flowable composite is effective, expedient, and inexpensive.