The Accuracy of the CBCT Images Superimposed with 3D Cast Scan Images by Using Matching Devices
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Abstract
Implant planning in implant planning software use two datasets, CBCT image and 3D cast scan image were superimposed. Maybe registration errors were scattering of metal restorations in CBCT image. The purpose of this study is to assess the accuracy of the CBCT images superimposed with 3D cast scan images by using matching devices. Four models were consist of different location of tooth-missing area and metal restoration. Then the model were duplicated for the plaster cast. Three matching devices were U shape acrylic plate, Y shape acrylic plate and acrylic baseplate with three fiducial markers were attached to it. CBCT scanning was used in model (both model with matching device and without it). And then optical 3D scanning was used in plaster cast (both plaster cast with matching device and without it). After the two datasets were matched by implant planning software, the average distances between reference points were measured. One-way ANOVA following by Tukey’s or Dunnett’s T3 multiple comparisons were tested (p=0.05). If matching devices were not used, the registration errors were less than 0.5 mm in model 1 and 2 but were statistically significant lower than model 3 (0.717 mm) and model 4 (1.033 mm). If matching devices were used, the registration errors were less than 0.5 mm in all models. Registration errors from using matching device in model 3 and 4 were statistically significant lower than not using matching devices. Consequently, using matching devices in model 3 and 4 that many tooth- missing and metal restoration in order to improve accuracy of the CBCT images superimposed with 3D cast scan images. The using matching devices in model 1 and 2 were not necessary due to the less difference errors.
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References
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