Adaptación marginal y ajuste interno en estructuras de zirconia-ytria elaboradas con los sistemas CAD/CAM Procera？ y Cerec in-Lab？

introduction: the purpose of this in vitro study was to determine the marginal adaptation and internal fit in zirconia ytrya frameworks fabricated with procera？ and cerec in-lab？ cad/cam systems. methods: fifteen prefabricated implant abutments were divided in three equally sized groups; noble metal alloy pd-au structures were then fabricated (control group), procera？ and cerec in-lab yz cubes？ (n = 5). the marginal gap was determined by measuring 8 points around the abutment circumference taking the distance between the margin of the structure and the abutment. in order to determine internal fit, 8 measures were taken from the abutment？s external surface to the internal surface of the restoration. the measures were done with an optical microscope (50x). the data was the statistically analyzed using 1-way anova, student？s paired t test and dunnett？test. results: marginal adaptation mean for the control group was 18.24±4.81μm and procera？ 21.62 μm ±12.15 μm, while the average for cerec in-lab？ was 47.34 μm ±17.72 μm. the internal fit for the control group was 34,60 μm ±16.16 μm and procera？ group was of 118.67 μm ±50.84 μm in average and cerec in-lab？ 65.62 μm ±25.80 μm. conclusion: the metal alloy and zirconia ytrya frameworks fabricated with procera？ and cerec in-lab？ cad/cam systems showed clinically acceptable marginal gap values. the internal fit values for metal alloy and cerec？ frameworks are within the ranges reported in the literature. while the mean for the procera？ group was 118.67 μm ±50.84, which is close to the internal fit maximum limit reported in the literature, there was no statistically significant difference when compared with the cerec-in-lab？ system.