A study on dimensional stability of emergence profile of light-curing 3D-printed models
HAN Jin-yu
WU Fan
WANG Jing
LI Na
Abstract：AIM:To investigate the effect of storage conditions and time on the dimensional stability of the emergence profile of light-curing 3D-printed dental models.METHODS:A patient who had received a single dental implant and temporary prosthesis in the anterior aesthetic region undergoing final restoration was selected.Digital indirect impression methods were used to obtain information of intraoral tissues,which was then saved as Standard Tessellation Language(STL)files.Twenty-four models were printed using a light-curing 3D-printer.After printing,the models were scanned with a desktop scanner to obtain STL files(designated as N-1d).Storage conditions included open-face plastic containers and closed boxes.Storage times were divided into T0,T3,T5,T7,T14,T28,T60 and T90.Models stored under the respective conditions and times were scanned to obtain STL files(designated as N-Lit-nd and N-Box-nd).The N-Lit-nd and N-Box-nd were aligned with N-1d using surface matching software,and dimensional accuracy was measured and compared using root-mean-square(RMS)method.RESULTS:For the same storage time,the RMS of the emergence profile in the open container were higher than those in the closed box.The difference in RMS between the two groups was statistically significant on the T14(P＜0.05).Under the same storage conditions,dimensional changes in the emergence profile increased with extended storage periods.Compared to T3,T5 and T7.the RMS for T14,T28,T60 and T90 exhibited statistically significant differences(P＜0.01).Additionally,the RMS values between T3 and T5,T14 and T28,T28 and T60,and T28 and T90 also had statistical significance(P＜0.05).CONCLUSION:The dimensional stability of the emergence profile of light-curing 3D-printed dental models are more stable when stored in sealed conditions under strict light-avoidance compared to natural light conditions.To minimize fabrication errors in aesthetic area implant restorations,it is recommended that the models be used within 14 days after printing.
Keywords：3D printing dental modelsemergence profilestorage conditionsdimensional stability
Publication Date：2024-11-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 647-651 )