Carlos Caparroso Pérez; Richard Mejía Bravo; Maura Noreña Salazar; Marleny Muñoz Madrigal & Ilich Chaves Calceto
Summary
Hybrid lithium disilicate custom abutments are devices that adjust the shape and the emergency profile of the implant supported restorations in each clinical situation, getting good optical characteristics and the possibility of adhesive cementation. The purpose of the study was to compare the fracture strength of Ti-base Hybrid lithium disilicate and yttria-tetragonal zirconia custom abutments through an experimental in vitro study. Ten abutments were prepared, five as a control group made in Y-TZP by multi-system X Ceramill Amann Girrbach®, and five lithium disilicate hybrid abutments by heat press technique (IPS e.max® press abutment solution, Ivoclar Vivadent) as experimental group. Each abutment was preloaded to an implant with torque of 30 N/cm2 . The crowns were fabricated in lithium disilicate (monolithic technique) and cemented using dual-curing resin cement, RelyX™ U200, 3M ESPE. The fracture strength measurements were performed on a universal testing machine (instron®), stored and evaluated using the t-student parametric test. An optical microscope (Carl Zeiss) was used to evaluate the incipient fractures and classify the type of failure. The average fracture strength of Ti-base Hybrid lithium disilicate was 655.5 N and the value for yttria-tetragonal zirconia custom abutments was 780.52 N, with a standard deviation of 145.76 N and 147.71 N, respectively. In both cases there was no statistical difference. Both types of abutments showed good performance to fracture strength test. Nevertheless more studies are required to evaluate this type of abutments.
KEY WORDS: ceramics, dental porcelain, lithium disilicate, hybrid abutment, fracture strength.
How to cite this article
CAPARROSO, P. C.; MEJÍA, B. R.; NOREÑA, S. M.; MUÑOZ, M. M. & CHAVES, C. I. In vitro evaluation of the fracture strength of lithium disilicate custom abutments. Int. J. Odontostomat., 10(2):185-195, 2016.