Michael Braian1, Ann Wennerberg2. 1. Doctoral student, Department of Prosthodontics, Faculty of Odontology, Malmö University, Malmö, Sweden. Electronic address: Michael.Braian@mau.se. 2. Professor, Department of Prosthodontics, Institute of Odontology, Sahlgrenska Academy, Gothenburg University, Gothenburg, Sweden.
Abstract
STATEMENT OF PROBLEM: Limited information is available on the trueness and precision of intraoral scanners (IOSs) for scanning dentate and edentulous casts. PURPOSE: The purpose of this in vitro study was to evaluate the trueness and precision of 5 different IOS devices for scanning a dentate and an edentulous cast in a standardized way for short arches and complete arches. MATERIAL AND METHODS: Five IOS devices were used to scan 2 computer metric measured casts using a coordinate measuring machine (CMM). Both were scanned 15 times. All scans were carried out by 1 experienced operator in a standardized way. One cast was edentulous, and 1 was dentate. Five cylindrical landmarks were added to each cast. These cylinders made the measurement of point-to-point distances possible, dividing the tests into cross-arch measurements and intercylindrical (short-arch) measurements. The Student t test, Mann-Whitney test, and Levene test for equality were used to calculate the difference between the edentulous and dentate scans for both cross-arch and intercylindrical measurements (α=.05). RESULTS: For the cross-arch measurements on the edentulous scans, the trueness values ranged between 6 μm (Emerald P1-P2) and 193 μm (Omnicam P1-P5) and for the intercylindrical measurements, between 2 μm (Itero P4-P5) and -103 μm (CS 3600 P1-P2). For the dentate cast, the cross-arch trueness values ranged between 6 μm (CS 3600 P1-P2) and 150 μm (TRIOS 3 P1-P5) and for the intercylindrical measurements, between 4 μm (Itero P4-P5) and -56 μm (Emerald P4-P5). CONCLUSIONS: Significant differences were found in scanning edentulous and dentate scans for short arches and complete arches. Trueness for complete-arch scans were <193 μm for edentulous scans and <150 μm for dentate scans. Trueness for short-arch scans were <103 μm for edentulous scans and <56 μm for dentate scans.
STATEMENT OF PROBLEM: Limited information is available on the trueness and precision of intraoral scanners (IOSs) for scanning dentate and edentulous casts. PURPOSE: The purpose of this in vitro study was to evaluate the trueness and precision of 5 different IOS devices for scanning a dentate and an edentulous cast in a standardized way for short arches and complete arches. MATERIAL AND METHODS: Five IOS devices were used to scan 2 computer metric measured casts using a coordinate measuring machine (CMM). Both were scanned 15 times. All scans were carried out by 1 experienced operator in a standardized way. One cast was edentulous, and 1 was dentate. Five cylindrical landmarks were added to each cast. These cylinders made the measurement of point-to-point distances possible, dividing the tests into cross-arch measurements and intercylindrical (short-arch) measurements. The Student t test, Mann-Whitney test, and Levene test for equality were used to calculate the difference between the edentulous and dentate scans for both cross-arch and intercylindrical measurements (α=.05). RESULTS: For the cross-arch measurements on the edentulous scans, the trueness values ranged between 6 μm (Emerald P1-P2) and 193 μm (Omnicam P1-P5) and for the intercylindrical measurements, between 2 μm (Itero P4-P5) and -103 μm (CS 3600 P1-P2). For the dentate cast, the cross-arch trueness values ranged between 6 μm (CS 3600 P1-P2) and 150 μm (TRIOS 3 P1-P5) and for the intercylindrical measurements, between 4 μm (Itero P4-P5) and -56 μm (Emerald P4-P5). CONCLUSIONS: Significant differences were found in scanning edentulous and dentate scans for short arches and complete arches. Trueness for complete-arch scans were <193 μm for edentulous scans and <150 μm for dentate scans. Trueness for short-arch scans were <103 μm for edentulous scans and <56 μm for dentate scans.