A primary study of appropriate intraoral scanning frequency of single 3D image

Hong Li; Peijun Lyu; Yuchun Sun; Yong Wang; Xiaoyue Liang

doi:10.1117/12.2189581

17 July 2015 A primary study of appropriate intraoral scanning frequency of single 3D image

Hong Li, Peijun Lyu, Yuchun Sun, Yong Wang, Xiaoyue Liang

Proceedings Volume 9524, International Conference on Optical and Photonic Engineering (icOPEN 2015); 95241T (2015) https://doi.org/10.1117/12.2189581
Event: International Conference on Optical and Photonic Engineering (icOPEN2015), 2015, Singapore, Singapore

Abstract

Objective To make a quantitative analysis between sampling frequencies and micro-movement distance of mark points on tooth surfaces, and to provide a reference for sampling frequency settings of intraoral scanning systems. Methods Mark points affixed to the incisors of five subjects. In total, 3600 groups of tracking point coordinates were obtained with frequencies of 60, 150 and 300 Hz using an optical 3D tracking system. The data was then re-sampled to obtain coordinates at lower frequencies (5, 10, 15 and 20 Hz) at equal intervals of groups of tracking point coordinates. Change in distance (Δd) was defined as the change in position of a single v from one sampling time point to another, and was valued by clinical accuracy requirement (20-100μm). The curve equation was fit quantitatively between Δd median (M) and the sampling frequency (f). The difference between upper and lower incisor mark points were analyzed by a non-parametric test; α=0.05. Result When the frequency (f) was 60 Hz, upper jaw Δd median (M) and interquartile (Q) were 14.4 μm and 9.2 μm, respectively, while the lower Δd(M) and (Q) were 6.4 μm and 10.2 μm, respectively. Every Δd value was less than 100 μm, while 74% of Δd vales were less than 20 μm. Δd(M) and f satisfy the power curve equation: Δd(M)=0.526×f-^0.979(f∈[5,300]). Significant differences of incisor feature points were noted between upper and lower jaws of the same subject (P<0.01). Conclusion Clinical accuracy can be met when the sampling frequency of the intraoral scanning system is 60 Hz.

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Hong Li, Peijun Lyu, Yuchun Sun, Yong Wang, and Xiaoyue Liang "A primary study of appropriate intraoral scanning frequency of single 3D image", Proc. SPIE 9524, International Conference on Optical and Photonic Engineering (icOPEN 2015), 95241T (17 July 2015); https://doi.org/10.1117/12.2189581

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KEYWORDS

3D image processing

3D acquisition

Optical tracking

Direct methods

Mouth

Natural surfaces

Tissues

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