The purpose of this research to compare the internal and marginal fit of two full crown’s materials made by (Cad/Cam) machine “lava plus high translucent zirconia and Ips-Emax using replica technique.
The research sample consisted of 60 premolars prepared to have a full crown and it was divided into two equal groups (n1=n2=30), in the first group the full crowns were fabricated by Lava Plus high translucent zirconia whereas in the second group the full crowns were fabricated by IPS-Emax.
Marginal adaptation of the crowns was measured by (cement replica technique) before applying the cementation steps of crowns, gingivo-incisal sections and mesio-distal sections were made and measured the marginal adaptation in 3 points in the cervical area and 3 points in the contact area using the BX41 OLYMPUS optical microscope magnifying ×10. Normal distribution of data was confirmed by using Kolmogorov-Smirnov test, then data analysis was done using Independent samples t-test at significance level of (α=0.05).
The average marginal gap of the Lava Plus and IPS-Emax full crowns were 105.72 and 152.57 micron respectively, therefor there is a statistically significant difference at 95% confidence level (p<0.05), the average marginal gap value of the second group was higher than the first group by (46.85 micron).
Among the limitations of this study we conclude that the marginal gap value of the full crowns varies according to the material which they were fabricated by it, Thus, LAVA Pluas high translucent zirconia Full crowns have more adaptation than Ips-Emax Full crowns as it represents less marginal gap values, although all values were within clinically acceptable limits.
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