Evaluation of the Linear Dimensional Stability of CAD/CAM Milled, 3-D Printed, and Heat-cured Denture Base Polymers Subjected to Thermocycling and Immersion in Artificial Saliva: An In vitro study
Mariya Dimitrova, Rada Kazakova, Angelina Vlahova
Computer-aided designing/computer-aided manufacturing, Denture base materials, Linear stability, Removable dentures, Three-dimensional printing
Citation Information :
Dimitrova M, Kazakova R, Vlahova A. Evaluation of the Linear Dimensional Stability of CAD/CAM Milled, 3-D Printed, and Heat-cured Denture Base Polymers Subjected to Thermocycling and Immersion in Artificial Saliva: An In vitro study. Int J Prosthodont Restor Dent 2023; 13 (3):177-183.
Purpose: The purpose of the study was to evaluate and compare the linear dimensional stability of three types of denture base polymers—computer-aided designing/computer-aided manufacturing (CAD/CAM) resin, three-dimensional (3D) printed resin, and heat-cured polymethylmethacrylate (PMMA), subjected to immersion in artificial saliva and thermocycling.
Materials and methods: A total of 300 test specimens were fabricated and divided into six groups (n = 50 each); [groups I and IV—CAD/CAM resin (Ivotion, Ivoclar Vivadent, Liechtenstein), groups II and V—3D printed resin (NextDent, 3D Systems, Netherlands), groups III and VI—PMMA denture base resin (Vertex BasiQ, 3D Systems, Netherlands)]. The dimensions of groups I, II, and III were measured with an accuracy of 0.02 mm with a digital caliper (Wireman, Brighton, United Kingdom), then they were immersed in artificial saliva for three intervals (7, 14, and 1 month), and measured after each period. Groups IV, V, and VI were subjected to thermocycling for 100 hours (5,000 cycles) between water baths of 5 and 55oC, then immersed in artificial saliva for the same intervals and measured again. The obtained data were submitted to a one-way analysis of variance (ANOVA) and the mean values were compared by the Tukey test.
Results: The results obtained indicated that the distinctions in linear stability among denture base polymers manufactured via 3D printing, CAD/CAM milling, and conventional methods are most noticeable following a 7-day immersion in artificial saliva. During this period, the 3D-printed dental resins exhibited higher average values. Over the course of 14 days and 1 month, the various groups demonstrated similar mean values, while the heat-cured conventional PMMA displayed greater linear stability.
Conclusion: To summarize, during the initial week of the study, 3D-printed denture base materials displayed more significant linear alterations, whereas CAD/CAM milled, and traditional resins showcased better resistance to dimensional changes throughout the entire test duration. It's important to note that substantial linear changes were observed in all groups after undergoing thermocycling. In the subsequent two observation periods, both CAD/CAM milled, and 3D-printed dental resins exhibited lower linear stability compared to conventional PMMA.
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