Marginal and Internal Adaptation of Lithium Disilicate Endocrowns Fabricated By Heat‐Pressable and Subtractive Techniques

Abstract

Purpose To evaluate and to compare the marginal and the internal fit of milled (MLE) and heat‐pressed lithium disilicate endocrowns (PLE). Materials and Methods Thirty mandibular molars were prepared following the circumferential butt margin endocrown preparations; the cervical margin is parallel to the occlusal surface without ferrule design. A digital scan of molars was made using an intraoral digital scanner. The samples were separated into two groups (n = 15 per group); MLE: endocrowns were milled using LDS blocks and a 5‐axis milling machine, PLE: endocrowns were heat‐pressed using lost wax technique and LDS ingots. Marginal and internal adaptation were assessed using a replica technique and a stereomicroscope, selecting 32 measurements on each endocrown. Data were analyzed with one‐way repeated measures ANOVA, two‐way repeated measures ANOVA, student's t‐test and paired student t‐test (α = 0.05). Results Statistically significant interactions were recorded between fabrication technique and region (p < 0.05), F (1.97, 27.69) = 5.462. Group MLE displayed significantly smaller gaps than PLE in all regions (p < 0.001). The largest gap was observed at the pulpal floor in both groups. The internal gap was significantly larger than the marginal gap in MLE group (p < 0.001), while no statistically significant difference was observed in PLE group (p = 0.082). Conclusion Heat‐pressed and milled lithium disilicate endocrowns are clinically suitable, but the milled technique displayed a better fit than heat‐pressed technique when marginal and internal adaptation were examined.

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“…[19][20][21]. Also there is other study shown the marginal adaptation of CAD/CAM endocrown had superior marginal seating than a classical full crowns [22].…”

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