Document Type : Original Article
Authors
1
Clinical instructor Oral Rehabilitation Sciences, Beirut Arab University, Faculty of Dentistry
2
Professor of Dental Biomaterials, Beirut Arab University, Faculty of Dentistry
3
Associate Professor of Prosthodontics, Beirut Arab University, Faculty of Dentistry, Assistant Professor of Fixed Prosthodontics, Faculty of Dentistry, Misr University for Science and Technology, Cairo, Egypt
4
Lecturer of Fixed Prosthodontics, Faculty of Dentistry, Misr University for Science and Technology, Cairo, Egypt
5
Lecturer of Fixed and Removable Prosthodontics Department, Oral and Dental Research Division, National Research Center, Cairo, Egypt
Abstract
Purpose: To compare the translucency and fracture resistance of crowns fabricated using 3 different ceramic materials.
Materials and Methods: A human maxillary right premolar was prepared to a 0.4 mm chamfer finish line, with 6 degrees convergence angle and 1.5 mm occlusal clearance. Using industrial silicon (Body Double, Smooth-On), a mold was poured to construct 20 identical resin dies. After scanning the resin dies, 10 ultratranslucency monolith zirconia (UTZ) crowns and 10 supertranslucency monolith zirconia (STZ) crowns were milled and sintered according to manufacturer directions. The same premolar was further prepared to a 0.6mm chamfer finish line, and 10 resin dies were constructed and scanned using same technique to perform ten IPS e.max crowns which were milled accordingly and sintered according to manufacturer directions. All specimens were tested for translucency using spectrophotometer (Nippon Densmoku industries). All specimens were then subjected to fracture resistance test using universal testing machine (The Testometric Company Limited), at cross head speed 0.5 mm/min, with force direction 90 degrees angle to the occlusal table, at the central fossa.
Results: Viewing the mean of translucency between studied groups, group STZ scored the highest TP (21.03±4.41), followed by group UTZ (19.42±4.31), then group IPS e.max (19.29±4.49). Regarding mean fracture strength, group UTZ scored the highest value (1009.91±360.20 N) followed by group STZ (847.18±329.92 N) then group IPS e.max (821.51±175.69 N). One-way ANOVA revealed no significant difference between groups in either translucency (P=0.621) or fracture strength (P=0.328).
Conclusions: The two tested hybrid ceramics could present an acceptable treatment option for fabricating monolith ceramic crowns. There was no significant difference in either translucency or fracture resistance between all tested groups.
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