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Clinical Trial
. 2018 Jun 12;8(1):8975.
doi: 10.1038/s41598-018-27277-5.

A pilot study of digital recording of edentulous jaw relations using a handheld scanner and specially designed headgear

Weiwei Li  1   2   3   4   5 , Qiufei Xie  2   6 , Yong Wang  7   8   9   10   11 , Yuchun Sun  12   13   14   15   16
Affiliations
Clinical Trial

A pilot study of digital recording of edentulous jaw relations using a handheld scanner and specially designed headgear

Weiwei Li et al. Sci Rep. .

Abstract

The present study aimed to establish and evaluate a method for recording edentulous jaw relations digitally without occlusal bases, using a handheld scanner and specially designed headgear. The headgear maintained the mandibular position. Ten edentulous patients' upper (U) and lower edentulous jaw models (L) were prepared and scanned. A handheld scanner was used to capture the labial alveolar ridge mucosa relations in the upper and lower anterior arches directly (Dr). U and L were registered to Dr (test group). Complete dentures of patients in the intercuspal position were used to construct the relationship between U and L (control group). Differences in jaw relations in the test and control groups, in terms of vertical difference, displacement and rotation of the anterior and posterior, and displacement and rotation of the left and right were assessed using the Hotelling's T2 test. The differences in the mean values and the mean of the absolute values of the jaw relations between groups were not statistically significant (P = 0.331) and significant (P = 0.016), respectively. Our findings show that it is possible to make digital recording of edentulous jaw relations by using a handheld scanner and headgear.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Figure 1
Figure 1
The headgear and data acquisition of test group. (a) The structure of the self-developed headgear and the retractor. (b) Adjustment of the chin plate. (c) Front view of the patient. (d) Lateral view of the patient. (e) 3D maxillomandibular relation record.
Figure 2
Figure 2
The 3D construction of the jaw relations in the test group. (a) Jaw relation record of the upper and lower edentulous jaws (Dr). (b) U, L, and Dr data were imported into Geomagic 2012. (c) 3D construction of direct digital jaw relation record. (d) 3D data of the lower facial one-third (Fr) and models of jaw relation.
Figure 3
Figure 3
The 3D construction of the jaw relations in the control group. (a) Tissue surface of the upper denture with the red common region used for registration. (b) Tissue surface of the lower denture with the red common region used for registration. (c) Models and complete dentures were imported into Geomagic 2012. (d) 3D construction of models of the jaw relations of the complete denture.
Figure 4
Figure 4
Establishment of the coordinate system (a) Left view. (b) Front view. (c) Right view.
See this image and copyright information in PMC

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