Effect of tooth preparation design on bond strengths of resin-bonded prostheses: A pilot study

Statement of problem. The success rate of resin-bonded fixed partial dentures is directly related to the adhesive system and the tooth preparation design for good retention. Purpose of study. This in vitro study evaluated the effect of various tooth preparation designs on the bond strength of retainers for adhesive fixed partial dentures. Material and methods. Molar teeth were prepared in the conventional form or with occlusal coverage and opposing grooves and retainers were silicoated and bonded to etched enamel by a bis-glycerol methacrylate adhesive. Bond strengths were determined after water storage and thermocycling. Results. The least mean bond strength was recorded for the conventional form of tooth preparation ( p < 0.05). Conclusion. A combination of 180-degree opposing groove placement at line angles ''wraparound'' and occlusal coverage resulted in the greatest bonding values.(J Prosthet Dent 1997;77:243-9.)