J Korean Acad Prosthodont.  2019 Jul;57(3):225-231. 10.4047/jkap.2019.57.3.225.

Comparison analysis of fracture load and flexural strength of provisional restorative resins fabricated by different methods

• Cho WT
• Choi JW

• KMID: 2453776
• DOI: http://doi.org/10.4047/jkap.2019.57.3.225

Abstract

PURPOSE
This study was undertaken to compare fracture and flexural strength of provisional restorative resins fabricated by additive manufacturing, subtractive manufacturing, and conventional direct technique.
MATERIALS AND METHODS
Five types of provisional restorative resin made with different methods were investigated: Stereolithography apparatus (SLA) 3D printer (S3Z), two digital light processing (DLP) 3D printer (D3Z, D3P), milling method (MIL), conventional method (CON). For fracture strength test, premolar shaped specimens were prepared by each method and stored in distilled water at 37℃ for 24 hours. Compressive load was measured using a universal testing machine (UTM). For flexural strength test, rectangular bar specimens (25 × 2 × 2 mm) were prepared by each method according to ISO 10477 and flexural strength was measured by UTM.
RESULTS
Fracture strengths of the S3Z, D3Z, and D3P groups fabricated by additive manufacturing were not significantly different from those of MIL and CON groups (P>.05/10=.005). On the other hand, the flexural strengths of S3Z, D3P, and MIL groups were significantly higher than that of CON group (P<.05), but the flexural strength of D3Z group was significantly lower than that of CON group (P<.05).
CONCLUSION
Within the limitation of our study, provisional restorative resins made from additive manufacturing showed clinically comparable fracture and flexural strength as those made by subtractive manufacturing and conventional method.

Keyword

Additive manufacturing; Subtractive manufacturing; Fracture strength; Flexural strength; Resin

MeSH Terms

Bicuspid
Hand
Methods*
Printing, Three-Dimensional
Water
Water

Figure

• 

  Fig. 1 Specimens prepared by each method for fracture strength test. (A) S3Z, (B) D3Z, (C) D3P, (D) MIL, (E) CON. S3Z, Resin printed by ZENITH SLA 3D printer; D3Z, Resin printed by ZENITH DLP 3D printer; D3P, Resin printed by PROBO DLP 3D printer; MIL, milled resin; CON, conventionally self-cured resin.

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  Fig. 2 Fracture strength test with the universal testing machine.

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  Fig. 3 Specimens for flexural strength test. (A) S3Z, (B) D3Z, (C) D3P, (D) MIL, (E) CON. S3Z, Resin printed by ZENITH SLA 3D printer; D3Z, Resin printed by ZENITH DLP 3D printer; D3P, Resin printed by PROBO DLP 3D printer; MIL, milled resin; CON, conventionally self-cured resin.

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  Fig. 4 Flexural strength test with the universal testing machine.

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  Fig. 5 Fracture strength values of tested group (unit: N). Values followed by the same letter were significantly different (P < .05/10 = .005).

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  Fig. 6 Flexural strength values (mean ± SD) of tested group (unit: MPa). Values followed by the same letter were significantly different (P < .05).

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