Abstract
Background
The
purpose of this study was to investigate the trueness of intraoral
scanning of residual ridge in edentulous regions during in vitro
evaluation of inter-operator validity.
Methods
Both
edentulous maxillary and partially edentulous mandibular models were
selected as a simulation model. As reference data, scanning of two
models was performed using a dental laboratory scanner (D900, 3Shape
A/S). Five dentists used an intraoral scanner (TRIOS 2, 3Shape A/S) five
times to capture intraoral scanner data, and the “zig-zag” scanning
technique was used. They did not have experience with using intraoral
scanners in clinical treatment. The intraoral scanner data was
overlapped with the reference data (Dental System, 3Shape A/S).
Regarding differences that occurred between the reference and intraoral
scanner data, the vertical maximum distance of the difference and the
integral value obtained by integrating the total distance were analyzed.
Results
In
terms of the maximum distances of the difference on the maxillary
model, the means of five operators were as follows: premolar region,
0.30 mm; molar region, 0.18 mm; and midline region, 0.18 mm. The
integral values were as follows: premolar region, 4.17 mm2; molar region, 6.82 mm2; and midline region, 4.70 mm2.
Significant inter-operator differences were observed with regard to the
integral values of the distance in the premolar and midline regions and
with regard to the maximum distance in the premolar region,
respectively. The maximum distances of the difference in the free end
saddles on mandibular model were as follows: right side, 0.05 mm; and
left side, 0.08 mm. The areas were as follows: right side, 0.78 mm2; and left side, 1.60 mm2. No significant inter-operator differences were observed in either region.
Conclusions
The
present study demonstrated satisfactory trueness of intraoral scanning
of the residual ridge in edentulous regions during in vitro evaluation
of inter-operator validity.
Comments