Root Canal Taper and the Accuracy of Intraoral Scanners for Post Space Measurement: An In Vitro Study

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Abstract The aim of the study is to evaluate the accuracy (trueness and precision) of two intraoral scanners (IOSs) for measuring post space length and area deviation in root canal-treated teeth with differing canal tapers, using a caliper as the reference standard. Fifteen endodontically treated resin teeth (n = 5 per group; maxillary central incisor, first premolar, and first molar) received 10 mm post spaces with sizes No. 2, No. 0.5, and No. 1, respectively. Each specimen was measured 10 times using each method: a digital caliper (reference), a conventional polyvinyl siloxane impression digitized with an extraoral scanner (inEos X5), and two IOSs, IOS-1 (Trios 4) and IOS-2 (CEREC Primescan). STL files were superimposed in OraCheck 5.0 to measure post space length and area deviation. The 10 scans were treated as replicates nested within each specimen in linear mixed-effects models; equivalence was tested using two one-sided tests against a ± 0.10 mm margin, and precision was expressed as the repeatability coefficient. Conventional impressions matched the caliper in every group and were equivalent within ± 0.10 mm. For Tooth 21, both scanners also met the equivalence margin. Both scanners underestimated Tooth 24 (IOS-1 −0.90 mm; IOS-2 −0.61 mm) and overestimated Tooth 26 (IOS-1 +0.28 mm; IOS-2 +0.25 mm), and neither met the equivalence margin (p

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Related topics: Endodontics and Root Canal Treatments · Dental materials and restorations · Orthodontics and Dentofacial Orthopedics