Future Dental Journal


Aim: This study investigated the effect of preparation design and thermal cycling on the marginal accuracy of hybrid ceramic laminate veneers. Materials and Methods: A total of twenty 3D printed dies of central incisors prepared with 2 preparation designs; butt joint and palatal wrap design were fabricated. Each type of preparation was assigned into 2 subgroups (n=5/each subgroup) according to the type of material used for fabrication of the laminate veneer; hybrid ceramic and lithium disilicate (served as control). Marginal discrepancy was evaluated using a digital microscope before and after thermocycling. Results: Statistically analysis of marginal gaps revealed that before thermocycling, butt joint design demonstrated larger average marginal gaps compared to palatal wrap design in both Enamic (76.18±0.07) and E-max (76.11±0.09µm). While smaller gaps was recorded in palatal wrap design E-max (63.27±0.28 µm) and Enamic (63.21±0.05). After thermocycling, palatal wrap design showed larger average marginal gaps in E-max (166.75 ±16.67 µm) and Enamic (157.52±15.44); while a significantly lower gap was recorded in butt joint design for Enamic (137.41±0.2) and E-max (137.41±0.09µm). There was no statistical significant difference between marginal gaps in Emax and Enamic within the same preparation design. Conclusion: Before thermocycling, the palatal wrap design laminate veneers showed smaller marginal gaps compared to butt joint. Thermalcycling caused a detrimental increase in marginal gaps . The effect of thermocycling was more profound on palatal wrap design veneers. The marginal accuracy of hybrid ceramic laminate veneers were statistically comparable to that of lithium disilicate.

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