Comparison of dimensional accuracy between direct-printed and thermoformed aligners
Koenig Nickolas, 최진영, McCray Julie, Hayes Andrew, Schneider Patricia, 김기범,
소속 상세정보
( Koenig Nickolas ) - Saint Louis University Department of Orthodontics
최진영 ( Choi Jin-Young ) - Kyung Hee University Graduate School of Dentistry Department of Orthodontics
( McCray Julie ) - Saint Louis University Department of Orthodontics
( Hayes Andrew ) - Saint Louis University Department of Orthodontics
( Schneider Patricia ) - Saint Louis University Department of Orthodontics
김기범 ( Kim Ki-Beom ) - Saint Louis University Department of Orthodontics
Abstract
Objective: The purpose of this study was to evaluate and compare the dimensional accuracy between thermoformed and direct-printed aligners.
Methods: Three types of aligners were manufactured from the same reference standard tessellation language (STL) file: thermoformed aligners were manufactured using Zendura FLXTM (n = 12) and Essix ACETM (n = 12), and direct-printed aligners were printed using Tera HarzTM TC-85DAP 3D Printer UV Resin (n = 12). The teeth were not manipulated with any tooth-moving software in this study. The samples were sprayed with an opaque scanning spray, scanned, imported to Geomagic® Control XTM metrology software, and superimposed on the reference STL file by using the best-fit alignment algorithm. Distances between the aligner meshes and the reference STL file were measured at nine anatomical landmarks.
Results: Mean absolute discrepancies in the Zendura FLXTM aligners ranged from 0.076 ± 0.057 mm to 0.260 ± 0.089 mm and those in the Essix ACETM aligners ranged from 0.188 ± 0.271 mm to 0.457 ± 0.350 mm, while in the direct-printed aligners, they ranged from 0.079 ± 0.054 mm to 0.224 ± 0.041 mm. Root mean square values, representing the overall trueness, ranged from 0.209 ± 0.094 mm for Essix ACETM, 0.188 ± 0.074 mm for Zendura FLXTM, and 0.140 ± 0.020 mm for the direct-printed aligners.
Conclusions: This study showed greater trueness and precision of direct-printed aligners than thermoformed aligners.
키워드
Aligner; Physical property; Resin; Three-dimensional scanner
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