Influence of different luting agents on the marginal discrepancy of Procera Allceram alumina crown copings - an experimental study

Abstract

Maxillary first molar and central incisor typhodont teeth were prepared with 0.8 mm chamfer, 2.0 mm occlusal reduction,and 6 degree taper. Totally 36 die stone models were obtained.

Zinc phosphate, glass ionomer and resin cement were used. Procera AllCeram 0.6 mm coping was fixed with a calibrated finger force of 50 N.

The absolute marginal discrepancy was measured using the SEM. Mann-Whitney U test and Kruskal-Wallis tests were employed to find significant differences.

The absolute marginal discrepancies were using zinc phosphate (AZ) 53; resin (AR) 44.5, glass ionomer (AG) 29 microm. There was a significant difference among luting cements AG V/s AZ (p = 0.001) and AR V/s AG (p = 0.003), except AR V/s AZ (p = 0.213).

All axial surfaces except mesial showed a significant difference. Conclusion different luting media have a definite effect over the final fit of AllCeram coping. Absolute marginal discrepancy was within the accepted level of 100 microm.