J Korean Acad Oral Health.  2023 Mar;47(1):40-46. 10.11149/jkaoh.2023.47.1.40.

Evaluation of fracture strength and translucency of 3D printing resin crown for carious primary anterior tooth

• Ham YJ
• Lee JH
• Kim JS
• Kim JB
• Han MR
• Shin JS

• KMID: 2541090
• DOI: http://doi.org/10.11149/jkaoh.2023.47.1.40

Abstract

Objectives
The purpose of this study was to compare the fracture strength and traslucency of 3D printing resin crowns according to different thicknesses.
Methods
Resin crowns were designed with CAD software and a 3D scanner, using scanned data of the #61 tooth model. Resin Crowns with different thicknesses were printed using a 3D printer, and subsequently divided into four groups according to thickness (0.3, 0.5, 0.7, and 1.0 mm). Fracture strength was compared among groups with a resin strip crown of 1.0 mm thickness. Compressive force was applied using a universal testing machine at 30° along the lingual surface at 1 mm/min cross head speed. For translucency evaluation, thin square specimens were printed of thicknesses 0.3, 0.5, 0.7, and 1.0 mm, and translucency was measured using a spectrophotometer.
Results
As a result of fracture strength measurement, fracture strength increased as thickness increased, and a significant difference was observed solely between thicknesses of 0.3 and 0.5 mm, and the thicknesses of 0.3 and 0.5 mm (P<0.05). Translucency decreased as thickness increased, and similarly, a significant difference was observed only between thicknesses of 0.3 and 0.5 mm and the thicknesses of 0.7 and 1.0 mm (P<0.05).
Conclusions
A 3D printing resin crown can be used as a clinical option for restoring a primary anterior tooth affected by caries.

Keyword

3D printing resin crown; Fracture strength; Primary anterior tooth; Translucency parameter

Figure

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  Fig. 1 CAD design for primary anterior 3D printing resin crown. (A-C) Designed resin crown view from buccal, below, and lateral. (D) 1.0 mm thickness of resin crowns design protocol.

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  Fig. 2 Designed resin crown for different lingual surface thickness. (A) 1.0 mm, (B) 0.7 mm, (C) 0.5 mm, (D) 0.3 mm.

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  Fig. 3 Design of metal abutment and crown cementation. (A) Design protocol of metal abutment for 1.0 mm thickness 3D printing resin crown, (B) Metal abutment of 1.0 mm thickness 3D printing resin crown, (C) Image of 3D printing resin crown cemented to the abutment (buccal), (D) Image of 3D printing resin crown cemented to the abutment (lingual).

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  Fig. 4 Design of resin specimens for measuring the translucency parameter.

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  Fig. 5 Comparison of fracture strength between different thickness of 3D printing resin crown and resin strip crown.

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  Fig. 6 Comparison of Translucency parameter between different thickness of 3D printing resin specimens.

Reference

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