Abstract

Background: We compared photogrammetry-assessed body posture between young adults with and without unilateral posterior crossbite (UPCB). Assessments were controlled by vision, mandibular position and sitting/standing position. In addition, we aimed to determine the relationship between UPCB laterality and the direction of body posture using photogrammetry and a static postural platform. Methods: Adults with natural dentition, with and without UPCB, were enrolled. Static body posture was assessed by photogrammetry based on horizontal acromial alignment and horizontal anterior-superior iliac spine (ASIS) alignment. Frontal photographs were taken with participants asked to open or close their eyes and hold their jaws at rest, at an intercuspal position, and at left or right lateral positions. Distribution of foot pressure was recorded using a static postural platform at different visual input and mandibular positions. General linear models with repeated measures were used to assess the effect of the various within- and between-subject factors. Results: In total, 36 adults (left UPCB = 12; Right UPCB = 6; controls = 18) participated. There were significant differences between the control and UPCB groups in horizontal alignment at the acromion (p = 0.035) and ASIS (p = 0.026) levels when controlled by visual input and mandibular position. No significant differences in horizontal alignment or foot pressure distribution were observed by laterality in the UPCB group. Conclusion: The presence of UPCB affects static body posture, but the side of crossbite is not related to the direction of effect on static body posture.

Highlights

  • Unilateral posterior crossbite (UPCB) at the intercuspal position (ICP) refers to an occlusal relationship in which the mandibular teeth of only one side are located facial to the opposing maxillary teeth

  • The primary aim of this study was to compare body posture assessed by photogrammetry in young adults with and without unilateral posterior crossbite (UPCB), controlling for vision, mandibular position and resting position

  • Pairwise comparisons revealed that control group had similar anterior-superior iliac spine (ASIS) angles than the right UPCB group and the left UPCB group

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Summary

Introduction

Unilateral posterior crossbite (UPCB) at the intercuspal position (ICP) refers to an occlusal relationship in which the mandibular teeth of only one side are located facial to the opposing maxillary teeth. It has been reported that UPCB could be associated with the body posture, especially with postural control and with scoliosis [8,9], though no association has been shown between the side of the scoliosis and the side of the posterior crossbite [8]. We compared photogrammetry-assessed body posture between young adults with and without unilateral posterior crossbite (UPCB). We aimed to determine the relationship between UPCB laterality and the direction of body posture using photogrammetry and a static postural platform. Static body posture was assessed by photogrammetry based on horizontal acromial alignment and horizontal anterior-superior iliac spine (ASIS) alignment. General linear models with repeated measures were used to assess the effect of the various within- and between-subject factors

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