Mechanical and Material Analysis of 3D-Printed Temporary Materials for Implant Reconstructions—A Pilot Study

Abstract

In this study, the authors analyzed modern resin materials typically used for temporary reconstructions on implants and manufactured via 3D printing. Three broadly used resins: NextDent Denture 3D, NextDent C&B MFH Bleach, and Graphy TC-80DP were selected for analysis and compared to currently used acrylic materials and ABS-like resin. In order to achieve this, mechanical tests were conducted, starting with the static tensile test PN-EN. After the mechanical tests, analysis of the chemical composition was performed and images of the SEM microstructure were taken. Moreover, numerical simulations were conducted to create numerical models of materials and compare the accuracy with the tensile test. The parameters obtained in the computational environment enabled more than 98% correspondence between numerical and experimental charts, which constitutes an important step towards the further development of numeric methods in dentistry and prosthodontics.

Investigations into the Material Characteristics of Selected Plastics Manufactured Using SLA-Type Additive Methods

“…The Johnson-Cook constitutive model was used to describe the material’s behavior in the plastic range. This model is quite popular due to the relatively simple determination of material parameters but also the presence of this formula in many numerical calculation programs [ 32 , 33 , 34 ]. Due to the lack of tests related to the influence of the strain rate and temperature on the strength of samples, only the first part of the formula—related to plastic strengthening—was used: where A is the yield strength, B is the strengthening constant, C is the strain rate constant, n is the strengthening exponent, m is the thermal softening coefficient, is the effective plastic strain, is the effective strain rate (dimensionless), is the strain rate, is the reference value for the strain rate, T * is the homologated temperature (dimensionless), T room is room temperature, T melt is the melting point, and T is the current temperature.…”