# Simulated brushing effects on surface roughness and color stability of coated additively manufactured dental resin: an in vitro study

## TL;DR

Applying a glaze coating to 3D-printed dental resin improves surface smoothness and maintains color stability even after simulated brushing.

## Contribution

The study introduces a glaze coating as a method to enhance the surface properties of 3D-printed dental resin materials.

## Key findings

- Glaze-coated specimens showed lower surface roughness compared to uncoated ones.
- Brushing simulation did not cause significant changes in surface roughness or color in either group.
- Color stability was maintained in both groups after simulated brushing.

## Abstract

This study aimed to evaluate the effect of a glaze coating on the surface roughness and color stability of 3D-printed temporary crown resin materials before and after simulated toothbrushing. Nano-filled ceramic resin specimens were fabricated using a 3D printer (Dentafab) with standardized dimensions of 10 mm in diameter and 2 mm in thickness. The specimens were divided into two groups: uncoated specimens serving as the control group and specimens coated with Optiglaze. Surface roughness and color measurements were recorded at baseline and after brushing simulation. Statistical analysis was performed using two-way analysis of variance (ANOVA) and paired-samples t-tests with StatPlus and JASP software, with the level of significance set at P < 0.05. Specimens treated with the glaze coating exhibited lower surface roughness values than the uncoated control group. However, no statistically significant differences were observed within either group before and after brushing. Additionally, simulated brushing did not result in clinically perceptible color changes in either group. Applying a glaze coating to 3D-printed temporary crown resin materials improves surface smoothness while maintaining color stability, even after simulated toothbrushing.