Comparison analysis of fracture load and flexural strength of provisional restorative resins fabricated by different methods
10.4047/jkap.2019.57.3.225
- Author:
Won Tak CHO
1
;
Jae Won CHOI
Author Information
1. Department of Prosthodontics, School of Dentistry, Pusan National University, Yangsan, Republic of Korea. won9180@hanmail.net
- Publication Type:Original Article
- Keywords:
Additive manufacturing;
Subtractive manufacturing;
Fracture strength;
Flexural strength;
Resin
- MeSH:
Bicuspid;
Hand;
Methods;
Printing, Three-Dimensional;
Water
- From:The Journal of Korean Academy of Prosthodontics
2019;57(3):225-231
- CountryRepublic of Korea
- Language:Korean
-
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.
