Portal de Periódicos da CAPES

Trueness and precision of 5 intraoral scanners for scanning edentulous and dentate complete-arch mandibular casts: A comparative in vitro study

2019; Elsevier BV; Volume: 122; Issue: 2 Linguagem: Inglês

10.1016/j.prosdent.2018.10.007

1097-6841

Michael Braian, Ann Wennerberg,

Oral and Maxillofacial Pathology

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.