J Dent Rehabil Appl Sci.  2017 Dec;33(4):260-268. 10.14368/jdras.2017.33.4.260.

Flexural strength of various kinds of the resin bridges fabricated with 3D printing

• Park SM
• Kim SK
• Park JM
• Kim JH
• Jeon YT
• Koak JY

• KMID: 2405538
• DOI: http://doi.org/10.14368/jdras.2017.33.4.260

Abstract

PURPOSE
Manufacturing with AM (Additive manufacturing) technique has many advantages; but, due to insufficient study in the area, it is not being widely used in the general clinic. In this study, differences of flexural strength among various materials of 3 unit fixed dental prosthesis were analyzed.
MATERIALS AND METHODS
A metal jig for specimens that had a 3-unit-fixed dental prosthesis figure were fabricated. The jigs were made appropriately to the specifications of the specimens. Three different kinds of materials of specimens which were NC (mathacrylic esther based), DP-1 (Bisphenol A epoxy acrylate type oligomer based), and DT-1 (urethane acrylate based) were printed with DLP machine. Five specimens for each kind of material were printed with an angle of 30° from the horizontal surface. The specimens were placed on the jig and the flexural strength was measured and recorded using Universal testing machine. The recorded data was analyzed in SPSS using One-way ANOVA and Tukey HSD to determine the significance of the differences of flexural strength among the groups.
RESULTS
The flexural strengths of each group were the followings: NC, 1119 ± 305 N; DP-1, 619 ± 150 N; DT-1, 413 ± 65 N. Using One-way ANOVA and Tukey Honestly Significant Difference test, significant difference was found between NC and the other groups (P < 0.05), but there was no significant difference between DP-1 and DT-1 (P > 0.05).
CONCLUSION
Higher flexural strength was shown in 3-unit-fixed dental prosthesis that were 3D printed using a DLP machine with NC material.

Keyword

3D print; flexural strength; digital light-processing printer; 3 unit-fixed dental prosthesis; additive manufacturing

MeSH Terms

Dental Prosthesis
Printing, Three-Dimensional*

Figure

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  Fig. 1 Dimension of metal jig and specimen, indenter.

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  Fig. 2 Procedure of specimen fabrication. (A) Metal jig with IP-scan-spray, (B) Metal jig in the scanner, (C) Scanning area setting, (D) Virtual model of metal jig, (E) Setting cement gap, (F, G) Bridge design, (H) Specimen designed with supporters

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  Fig. 3 Flexural strength test of specimen with Universal testing machine

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  Fig. 4 (A, B) Examples of NC specimen fracture, (C, D) Examples of DP-1 specimen fracture, (E, F) Examples of DT-1 specimen fracture

Reference

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