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Comparison of Mechanical Properties, Surface Roughness, and Color Stability of 3D-Printed and Conventional Heat-Polymerizing Denture Base Materials Publisher Pubmed



Falahchai M1 ; Ghavamilahiji M1, 2 ; Rasaie V3 ; Amin M1, 2, 4 ; Neshandar Asli H1, 2
Authors
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Authors Affiliations
  1. 1. Associate Professor, Department of Prosthodontics, Dental Sciences Research Center, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran
  2. 2. Assistant Professor, Dental Sciences Research Center, Department of Restorative Dentistry, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran
  3. 3. Researcher, Department of Prosthodontics, Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran
  4. 4. Graduate student, Dental Sciences Research Center, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran
  5. 5. Professor, Department of Prosthodontics, Dental Sciences Research Center, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran

Source: Journal of Prosthetic Dentistry Published:2023


Abstract

Statement of problem: Studies on the mechanical, optical, and surface properties of 3-dimensionally (3D) printed denture base materials are scarce, and those available have reported conflicting results. Purpose: The purpose of this in vitro study was to compare the mechanical properties, surface roughness, and color stability of 3D-printed and conventional heat-polymerizing denture base materials. Material and methods: A total of 34 rectangular specimens (64×10×3.3 mm) were fabricated from each of the conventional (SR Triplex Hot; Ivoclar AG) and 3D-printed (Denta base; Asiga) denture base materials. All specimens underwent coffee thermocycling for 5000 cycles, and half in each group (n=17) were evaluated in terms of color parameters, color change (ΔE00), and surface roughness (Ra) before and after coffee thermocycling. The specimens then underwent a 3-point bend test. The remaining specimens in each group (n=17) underwent impact strength and Vickers hardness testing. Data were analyzed by the paired samples, independent samples, and Wilcoxon signed rank tests (α=.05). Results: The color change caused by coffee thermocycling in the 3D-printed group was higher than that in the conventional group (P<.001). Surface roughness significantly increased in both groups after coffee thermocycling (P<.001). The conventional group had higher surface roughness before coffee thermocycling, while the 3D-printed group had higher surface roughness after coffee thermocycling (P<.001). The flexural strength, flexural modulus, and surface hardness in the conventional group were significantly higher than those in the 3D-printed group (P<.001). However, the impact strength of the conventional group was lower than that of the 3D-printed group (P<.001). Conclusions: The 3D-printed denture base material showed higher impact strength and surface roughness than the conventional heat-polymerizing acrylic resin. However, flexural strength and modulus, surface hardness, and color stability were lower in the 3D-printed group. © 2023
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