Marginal and Internal Assessment of Press and Computer-aided design/Computer-aided manufacturing Lithium Disilicate Veneer Using Conventional and Digital Impressions
DOI:
https://doi.org/10.56056/Keywords:
Conventional Impressions, Marginal Fitness, Maxillary Central IncisorAbstract
Background and objectives: Lithium disilicate veneers are highly valued for their ability to change the size, shape, or color of teeth, as well as for their fitness to the teeth. This study evaluates the marginal and internal fitness of lithium disilicate veneers, fabricated using conventional and computer-aided design and computer-aided manufacturing methods with both conventional and digital impressions.
Methods: This in Vitro-study was done in University of Duhok, college of Dentistry from January 12, 2023, to April 5, 2023. A maxillary central incisor was prepared for veneers. Thirty-two resin die samples were created from digital impressions for veneer cementation. Sixteen pressable lithium disilicate veneers were produced using the conventional lost wax pattern method (Groups A&B): eight from conventional impressions and eight from digital impressions. Sixteen lithium disilicate veneers were made by computer-aided design and computer-aided manufacturing for the two other groups C&D. Lithium disilicate computer-aided design blocks were milled using a five-axis milling machine. Veneers were cemented with 3M ReyX veneer resin cement.
Results: Significant differences in marginal fitness were observed among techniques (P<0.0001). Scan-press showed significantly larger marginal gap (147.00µm) compared to scan-computer-aided design and computer-aided manufacturing(97.25µm), conventional-press(112.1µm), and conventional-computer-aided design and computer-aided manufacturing (88.5µm). For internal fitness, conventional-press exhibited larger internal gap (100.58µm) than conventional-computer-aided design and computer-aided manufacturing (87.25µm). (P<0.001).
Conclusions: Lithium disilicate veneers fabricated using computer-aided design and computer-aided manufacturing technology with conventional impressions demonstrated superior marginal and internal fitness compared to other groups.
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