J Korean Acad Prosthodont.  2019 Apr;57(2):110-117. 10.4047/jkap.2019.57.2.110.

In vitro evaluation of the wear resistance of provisional resin materials fabricated by different methods

Affiliations
  • 1Department of Prosthodontics, School of Dentistry, Pusan National University, Yangsan, Republic of Korea. won9180@hanmail.net
  • 2Institute of Translational Dental Sciences, Pusan National University, Yangsan, Republic of Korea.

Abstract

PURPOSE
This study was to evaluate the wear resistance of 3D printed, milled, and conventionally cured provisional resin materials.
MATERIALS AND METHODS
Four types of resin materials made with different methods were examined: Stereolithography apparatus (SLA) 3D printed resin (S3P), digital light processing (DLP) 3D printed resin (D3P), milled resin (MIL), conventionally self-cured resin (CON). In the 3D printed resin specimens, the build orientation and layer thickness were set to 0° and 100 µm, respectively. The specimens were tested in a 2-axis chewing simulator with the steatite as the antagonist under thermocycling condition (5 kg, 30,000 cycles, 0.8 Hz, 5℃/55℃). Wear losses of the specimens were calculated using CAD software and scanning electron microscope (SEM) was used to investigate wear surface of the specimens. Statistical significance was determined using One-way ANOVA and Dunnett T3 analysis (α = .05).
RESULTS
Wear losses of the S3P, D3P, and MIL groups significantly smaller than those of the CON group (P < .05). There was no significant difference among S3P, D3P, and MIL group (P > .05). In the SEM observations, in the S3P and D3P groups, vertical cracks were observed in the sliding direction of the antagonist. In the MIL group, there was an overall uniform wear surface, whereas in the CON group, a distinct wear track and numerous bubbles were observed.
CONCLUSION
Within the limits of this study, provisional resin materials made with 3D printing show adequate wear resistance for applications in dentistry.

Keyword

3D printing; Additive manufacturing; Subtractive manufacturing; Resin; Wear

MeSH Terms

Clothing
Dentistry
In Vitro Techniques*
Mastication
Methods*
Printing, Three-Dimensional
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