الفهرس 
Restoration of Endodontically Treated Teeth
Heat-/hot-pressing technique (lost-wax technique).Only 14 pages are availabe for public view
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Abstract
This in vitro study aims to assessment of fracture resistance, marginal and internal adaptation of endocrowns using two different heat press ceramic materials using a universal testing machine for fracture assessment and a scanning electron microscope (SEM) for marginal and internal adaptation assessment. forty extracted human mandibular first molars were collected for the study. The teeth were mounted in acrylic blocks using a dental surveyor. All teeth are endodontically treated and prepared for endocrown restorations then divided into 2 groups according to the material used: group (A) for endocrown restorations (N=20) from Lithium disilicate glass ceramic IPS e.max Press and group (B) for endocrown restorations (N=20) from Zirconia-reinforced lithium silicate glass ceramic (Vita Ambria) .then Specimens of each group will be further subdivided into 2 subgroups: Subgroup (1): endocrown restorations (N=10) for assessment of fracture resistance and Subgroup (2): endocrown restoration (N=10) for assessment of marginal and internal adaptation. Wax up for all teeth was done using CAD-CAM technology. Endocrowns were fabricated with heat press method. fracture resistance of samples was evaluated using universal testing machine. marginal and internal adaptation were evaluated using scanning electron microscope (SEM). Quantitative variables were expressed as mean and standard deviation using one way analysis of variance (ANOVA) followed by Tukey’s post hoc test. fracture resistance test: the Vita Ambria mean values (2174.99 ± 537.65) N had more compressive strength than IPS e.max press mean values (1974.33 ± 566.35) N. The marginal adaptation test using SEM: there was no significant difference between both materials (p = 0.656). The internal adaptation test using SEM: there was no significant difference between both materials (p = 0.855).