IADR Abstract Archives
Effect of Solvents on Mechanical Properties of 3D-Printed Permanent Crowns
Objectives: 3D-printed resin-based composites for permanent crown restorations are now available. However, their long-term performance has not yet been fully evaluated. This can be achieved by an aging process that employs storage in suitable solvents. The aim was to investigate the effect of solvents on mechanical properties of 3D-Printed resins for permanent crown restorations.
Methods: Three permanent crown resin-based materials: Permanent crown (Formlab; PCR), VarseoSmile Crown plus (BEGO; VCP) and Crowntec (Saremco print; CT) were tested. Three-point bending test was used to measure flexural strength (FS) and flexural modulus (Ef) using a universal testing machine Zwick/Roell (Z020). Martens Hardness (HM) was measured using a Zwick/Roell (Z2.5) Martens Hardness with a Vickers hardness measuring tip. Properties were evaluated on polished specimens 24h after fabrication at dry condition and then after 1 and 7 days storage in distilled water (W) and 75% Ethanol/water (E 75%) at 37 °C. Data were analysed using one-way repeated measures ANOVA and three-way ANOVA (α = 0.05).
Results: At dry condition, mechanical properties respectively for PCR, CT and VCP were (FS was 135.6, 132.3 and 120.3 MPa), (Ef was 4318, 4109 and 3963 MPa) and (HM was 218.6, 219.7 and 213.6 N/mm2). After 7 days storage in E 75%, there was ≈ a 20 % reduction in the FS of all materials. Ef had a lower but significant reduction. HM was significantly affected by storage media and time (p < 0.001). After 7 days storage in E 75% HM respectively for PCR, VCP and CT was 157.1, 178.4 and 183.6 N/mm2.
Conclusions: Although Martens Hardness of all investigated materials was adversely affected by different solvents, all materials showed acceptable mechanical properties after aging.
Methods: Three permanent crown resin-based materials: Permanent crown (Formlab; PCR), VarseoSmile Crown plus (BEGO; VCP) and Crowntec (Saremco print; CT) were tested. Three-point bending test was used to measure flexural strength (FS) and flexural modulus (Ef) using a universal testing machine Zwick/Roell (Z020). Martens Hardness (HM) was measured using a Zwick/Roell (Z2.5) Martens Hardness with a Vickers hardness measuring tip. Properties were evaluated on polished specimens 24h after fabrication at dry condition and then after 1 and 7 days storage in distilled water (W) and 75% Ethanol/water (E 75%) at 37 °C. Data were analysed using one-way repeated measures ANOVA and three-way ANOVA (α = 0.05).
Results: At dry condition, mechanical properties respectively for PCR, CT and VCP were (FS was 135.6, 132.3 and 120.3 MPa), (Ef was 4318, 4109 and 3963 MPa) and (HM was 218.6, 219.7 and 213.6 N/mm2). After 7 days storage in E 75%, there was ≈ a 20 % reduction in the FS of all materials. Ef had a lower but significant reduction. HM was significantly affected by storage media and time (p < 0.001). After 7 days storage in E 75% HM respectively for PCR, VCP and CT was 157.1, 178.4 and 183.6 N/mm2.
Conclusions: Although Martens Hardness of all investigated materials was adversely affected by different solvents, all materials showed acceptable mechanical properties after aging.
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