J Dent Rehabil Appl Sci.  2024 Aug;40(3):135-141. 10.14368/jdras.2024.40.3.135.

Effects of wax rim in image registration of intraoral and face scan in edentulous arch condition

• Seo SH
• Lee CH
• Lee KB
• Kim SY
• Lee DH

• KMID: 2562757
• DOI: http://doi.org/10.14368/jdras.2024.40.3.135

Abstract

Purpose
The purpose of this study was to investigate the accuracy of image merging of an intraoral scan of an edentulous arch to a facial scan using wax rim and markers. .
Materials and Methods
For registration of oral scan to face scan, a wax rim with markers was made. The markers were cuboid and divided into four groups according to size (5, 10 mm) and attachment location (midline, canine region). The evaluation of registration accuracy was compared with a standard created using cone-beam computed tomography data. Anterior linear variation of the edentulous arch and the 3D variation of the overall arch were measured. Kruskal-Wallis test and Mann-Whitney U test were used for statistics, and the significance level was set at 0.05 and evaluated under Bonferroni correction (0.05/6 = 0.083).
Results
In the anterior deviation and global deviation results, there was no statistically significant difference in the oral scan position displacement values between the 5 mm and 10 mm groups. When the midline marker was used, the intraoral scan position displacement value was significantly lower than when only the canine marker was used.
Conclusion
Marker attached wax rim can be used for image matching between facial and intraoral scans of the edentulous arch. Marker location at the middle area increases the accuracy of image matching.

Keyword

edentulous arch; wax rim; marker; facial scan; oral scan; image integration

Figure

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  Fig. 1 Workflow of this study.

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  Fig. 2 Position of markers at (A) Midline and lateral area, (B) Lateral area.

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  Fig. 3 Outcome variable. (A) Anterior deviation, (B) Global deviation.

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  Fig. 4 Anterior deviation of aligned maxillary model in each group. 5: 5-mm size; 10: 10-mm size; ML: midline and lateral position; L: lateral position. * Statistical significance.

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  Fig. 5 Global deviation of aligned maxillary model in each group. 5: 5-mm size; 10: 10-mm size; ML: midline and lateral position; L: lateral position. * Statistical significance.

Reference

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