Complete Digital Workflow for Evaluation of the Three-Dimensional Monson's Sphere Using Digital Scanning

IF 1.7 Q3 DENTISTRY, ORAL SURGERY & MEDICINE Clinical and Experimental Dental Research Pub Date : 2025-03-11 DOI:10.1002/cre2.70063
Cheng Wen, Huan Huan Wang, Huo Jia Muhetaer, Fan Xie, Rui Han, Jin Cheng Wu
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Abstract

Background

As a combination of curve of Spee and curve of Wilson, the Monson sphere reflects the arrangement of teeth in three-dimensional (3D) space. For occlusal analysis, the Monson sphere can provide an important reference for prosthetic reconstructions or orthodontic treatments.

Objectives

The purpose of this study was to generate and investigate the 3-D Monson sphere through a complete digital workflow with intraoral scanning models and custom software.

Material and Methods

Sixty-four Chinese adults (32 males and 32 females) with individual normal occlusion were recruited, and their intraoral scanning models were obtained using a digital intraoral scanner. Twenty-six landmarks on the scanning models were digitized using a reverse engineering software. Monson's sphere was generated and evaluated by fitting a sphere to the cusp tips using a least-squares method by means of custom software program. Mann–Whitney's U test was performed to test the radius difference of Monson's sphere between males and females. One-sample t-test was used to test the statistical significance (α = 0.05).

Results

Monson's sphere could be generated by means of digital scanning combined with customed software. The mean radius of Monson's sphere was 77.35 ± 13.38 mm, which was lower than the theoretical value proposed by Monson. Furthermore, there were significant differences between males and females in Monson's sphere radius (p < 0.001).

Conclusions

This study explores a new best-fit algorithm for generating 3-D Monson's sphere by complete digital workflow. The radius of Monson's sphere in Chinese adults was lower than the classical value of four-inch proposed by Monson. There was a significant difference between males and females. Monson's sphere value found in this study could be used as a reference for prosthetic reconstruction and orthodontic treatment and be applied to improve dental treatment results.

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来源期刊
Clinical and Experimental Dental Research
Clinical and Experimental Dental Research DENTISTRY, ORAL SURGERY & MEDICINE-
CiteScore
3.30
自引率
5.60%
发文量
165
审稿时长
26 weeks
期刊介绍: Clinical and Experimental Dental Research aims to provide open access peer-reviewed publications of high scientific quality representing original clinical, diagnostic or experimental work within all disciplines and fields of oral medicine and dentistry. The scope of Clinical and Experimental Dental Research comprises original research material on the anatomy, physiology and pathology of oro-facial, oro-pharyngeal and maxillofacial tissues, and functions and dysfunctions within the stomatognathic system, and the epidemiology, aetiology, prevention, diagnosis, prognosis and therapy of diseases and conditions that have an effect on the homeostasis of the mouth, jaws, and closely associated structures, as well as the healing and regeneration and the clinical aspects of replacement of hard and soft tissues with biomaterials, and the rehabilitation of stomatognathic functions. Studies that bring new knowledge on how to advance health on the individual or public health levels, including interactions between oral and general health and ill-health are welcome.
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