In Vitro Evaluation of the Flexural Strength of Different Temporary Crown Materials, After Thermocycling
Georges El Najjar1,3*, Halal R2, Daou M3 and Zebouni E1
1Department of Fixed Prosthetics, Saint-Joseph University, Lebanon
2Private Practice, Lebanon
3Department of Pediatric Dentistry, Saint-Joseph University, Lebanon
*Corresponding Author: Georges El Najjar, Research Assistant, Department of Fixed Prosthetics, Saint-Joseph University, Lebanon.
Received: July 17, 2021s; Published: August 24, 2021
Objective of this Study: To study the variation of flexural strength as a function of time during an interval simulating a time span of a year in the mouth and determine whether the mechanical performance of the materials in question remains acceptable.
Materials and Methods: Three types of materials are used: bis-acrylic resin (Tempsmart® and Cooltemp®), conventional PMMA (Unifast III®) and composite resin (Revoteck LC®). The flexural strength is evaluated. The samples undergo thermal cycling up to 10 000 cycles and are evaluated at different points in time.
Results: The bis-acrylic and conventional PMMA showed acceptable results throughout this study. The bis-acrylic material Tempsmart® showed the best values. The composite material Revoteck LC® has shown to be inadequate.
Conclusion: Among the tested materials, Tempsmart® is the most suited for long-term temporary restorations.
Keywords: Flexural Strength; Temporary Restoration; Bis-Acrylic Resin; Composite Resin; Conventional PMMA
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