Abstract
Research on whether the number or location of missing teeth affects the accuracy of intraoral scanners in partial edentulous patients is scarce. This study aimed to evaluate the precision of complete-arch scan data of various partial edentulous arches acquired by intraoral scanners. Five different maxillary models were scanned using Carestream CS3600 and Medit i500 scanners. The models employed here were control: Fully dentate; Case 1: Missing a right second premolar and a first molar; Case 2: Missing a right second premolar, a first molar, both left premolars, and a left first molar; Case 3: Missing four incisors and a right canine; and Case 4: Missing four incisors, a left second premolar, and a first molar. Six scans per group were performed and the resulting two datasets were paired to analyze the precision of each group (n = 15). Two-way ANOVA was performed (α = 0.05). The root mean square (RMS) error values in Cases 2, 3, and 4 were significantly higher than those in Case 1 and control. The RMS values of the two intraoral scanners were not significantly different. Scanning precision was significantly lower for both devices when used for scanning dental arches with ≥5 missing teeth.
Highlights
The use of digital methods, such as computer-aided design and computer-aided manufacturing (CAD–CAM), is rapidly increasing in the field of dentistry [1,2,3,4]
Partially edentulous arches may present a wide array of scenarios depending on the number and location of the missing teeth, which makes it necessary to determine whether there is a difference in accuracy according to the various cases of partially edentulous dentitions. In view of this scientific lacuna, the present study aimed to evaluate the precision of complete-arch scan data of various partially edentulous states acquired by two intraoral scanners
It reveals that the root mean square (RMS) values varied considerably across the five different dentitions (p < 0.001, post hoc power = 1.00)
Summary
The use of digital methods, such as computer-aided design and computer-aided manufacturing (CAD–CAM), is rapidly increasing in the field of dentistry [1,2,3,4]. To effectively perform many dental procedures using a completely digital workflow without producing conventional stone casts, any intraoral scanners employed should clearly achieve clinically acceptable levels of accuracy [9,10]. The accuracy of such devices is largely evaluated in two ways: Trueness and precision [11,12,13]. Precision is again referred to in two ways: Repeatability, which usually refers to the precision involved when the same operator measures the same object multiple times in the same environment, and reproducibility, which is evaluated by the degree to which the results are consistent even when different operators are doing the scanning or when the scanning environment changes [11]
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