Evaluation of wear characteristics of natural teeth opposing all-ceramic restorations: An in vitro study

Abstract

The study was coducted to evaluate and compare the wear behaviour of human enamel opposing three different newly introduced pressable all ceramic restorations. Materials and Methods: 45 freshly extracted human first premolar teeth were collected and divided into three groups of 15 each. The teeth were sectioned at CEJ and enamel specimens were mounted onto an acrylic wheel with 2 mm of buccal and lingual cusps exposed. 15 ceramic disks were prepared from each of three pressable ceramics. The enamel specimens and ceramic disks were subjected to wear under load of 100 N for 10000 cycles at 72 rpm. Enamel specimens were weighed before and after wear testing and observed under SEM for wear pattern. Results: The mean weight loss of Group C was greater than Group B followed by Group A. Pairwise comparision showed there was highly significant difference in weight loss among the groups. Conclusion: IPS e max press produced least wear followed by VITA PM9 and Ultra Will Ceram. IPS e max press produced least rough surface followed by VITA PM9 whereas Ultra Will Ceram produced roughest surface.