Journal
JOURNAL OF DENTISTRY
Volume 135, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jdent.2023.104598
Keywords
Digital light processing; Layer thickness; Build angle; Viscosity; Hardness; Flexural strength; Trueness
Categories
Ask authors/readers for more resources
This study investigated the effects of layer thickness, build angle, and viscosity on the mechanical properties and trueness of denture base resins used for digital light processing (DLP). It found that using low-viscosity resin, a layer thickness of 50 μm, and a build angle of 45 degrees resulted in denture bases with higher hardness and trueness.
Objectives: To investigate effects of layer thickness, build angle, and viscosity on the mechanical properties and trueness of denture base resins used for digital light processing (DLP).Methods: Two denture base resins for DLP in different viscosity (high and low) were tested by using two manufacturing parameters:1) layer thickness (LT) (50-or 100-& mu;m) and 2) build angle (BA) (0-, 45-, and 90-de-gree). disk-and bar-shaped specimens were used to evaluate hardness and flexural strength, respectively. Denture base specimens were used to examine trueness, and the deviation was calculated as the root mean square. Three-way analysis of variance (ANOVA) was conducted to determine the interaction among the three factors (viscosity, LT, and BA). Statistical significance was set at P < .05.Results: Effects of LT and BA on hardness differed according to viscosity, with significant interactions among three factors (P=.027). Regardless of LT or BA, the low-viscosity group had higher hardness than the high-viscosity group (P<.001). In terms of flexural strength, no significant interaction was detected between the factors (P=.212), however, the effects of LT and BA were significant (P=.003 and P<.001, respectively). Regarding trueness, a significant interaction was observed between viscosity and BA (P=.001). Low-viscosity group had higher trueness than high-viscosity group when the 45-and 90-degree BA were applied (P<.001).Conclusions: LT and BA significantly affected the mechanical properties and trueness of the 3DP denture base, depending on the viscosity. For hardness and trueness, using low-viscosity resin and manufacturing with 50-& mu;m LT and 45-degree BA are recommended.Clinical Significance: Resin viscosity affects the influence of LT and BA on the hardness, flexural strength, and trueness of DLP-generated denture bases. A 50-& mu;m LT and 45-degree BA can be used with a low-viscosity resin to fabricate denture bases with higher hardness and trueness.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available