IADR Abstract Archives
Evaluation of Trueness Using Different Post-curing Conditions Achieved by Stereolithography
Objectives: The purpose of this in vitro study was to investigate the effect of different post-curing time and temperature on changes of trueness of stereolithography (SLA) denture.
Methods: Sixty specimens that simulated the maxillary edentulous ridge were fabricated from clear photopolymer resin. Post-curing was carried out two periods (15 and 30min) at 3 different temperatures (40°C, 60°C, and 80°C). Tissue surface of post-curing denture was digitized with light scanner. The trueness was evaluated by superimposing the post-curing STL file on the original STL file for each specimen via a best-fit method (n=10/condition). The acquired images were processed and analyzed using 3-dimensional analysis software. Root means square estimates (RMSEs), and color map data were obtained. ANOVA and Tukey test were conducted to assess statistical significance of differences among the groups (α=0.05).
Results: The lowest RMSEs was obtained at 30min/40°C, followed by 15min/40°C group, which was significantly different from the 15min/60°C, 15min/80°C, and 30min/80°C groups (P<0.001). The highest RMSEs was found in the 30min/80°C group, followed by the 15min/80°C group. The RMSEs tended to increase when the temperature was increased, for both 15 and 30min times. However, in the same temperature condition, the longer post-curing time has not affected the changes of RMSEs significantly. Moreover, the RMSEs in the 15min/40°C, 30min/40°C, and 30min/60°C groups were not significantly different. The overall color map deviation patterns were green to light red in all groups at palatal surface, but it was a uniform deposited layer green in 30min/40°C group. The color map in 15min/40°C and 30min/40°C groups were similar deviation pattern.
Conclusions: Post-curing conditions influenced the mean of RMSEs values of trueness. The RMSEs and color map data of 15min/40°C and 30min/40°C displayed superior in trueness of SLA dentures among groups. The lower temperature offered better trueness and less likely to be influenced by time.
Methods: Sixty specimens that simulated the maxillary edentulous ridge were fabricated from clear photopolymer resin. Post-curing was carried out two periods (15 and 30min) at 3 different temperatures (40°C, 60°C, and 80°C). Tissue surface of post-curing denture was digitized with light scanner. The trueness was evaluated by superimposing the post-curing STL file on the original STL file for each specimen via a best-fit method (n=10/condition). The acquired images were processed and analyzed using 3-dimensional analysis software. Root means square estimates (RMSEs), and color map data were obtained. ANOVA and Tukey test were conducted to assess statistical significance of differences among the groups (α=0.05).
Results: The lowest RMSEs was obtained at 30min/40°C, followed by 15min/40°C group, which was significantly different from the 15min/60°C, 15min/80°C, and 30min/80°C groups (P<0.001). The highest RMSEs was found in the 30min/80°C group, followed by the 15min/80°C group. The RMSEs tended to increase when the temperature was increased, for both 15 and 30min times. However, in the same temperature condition, the longer post-curing time has not affected the changes of RMSEs significantly. Moreover, the RMSEs in the 15min/40°C, 30min/40°C, and 30min/60°C groups were not significantly different. The overall color map deviation patterns were green to light red in all groups at palatal surface, but it was a uniform deposited layer green in 30min/40°C group. The color map in 15min/40°C and 30min/40°C groups were similar deviation pattern.
Conclusions: Post-curing conditions influenced the mean of RMSEs values of trueness. The RMSEs and color map data of 15min/40°C and 30min/40°C displayed superior in trueness of SLA dentures among groups. The lower temperature offered better trueness and less likely to be influenced by time.
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