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Related Experiment Videos

Unilateral posterior crossbite and mastication.

Benito Rilo1, José Luis da Silva, María Jesús Mora

  • 1Prosthodontics Department, University of Santiago de Compostela, 15705 Santiago de Compostela, Spain. protesis@usc.es

Archives of Oral Biology
|November 28, 2006
PubMed
Summary

Adults with unilateral posterior crossbite (UPXB) exhibit altered masticatory cycle morphology and reduced contact glide distance. These changes likely represent adaptive mechanisms to maintain chewing function despite the dental malocclusion.

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Area of Science:

  • Dental occlusion
  • Biomechanics
  • Masticatory function

Background:

  • Unilateral posterior crossbite (UPXB) is a common dental malocclusion.
  • The impact of UPXB on masticatory cycle morphology and contact glide distance is not fully understood.

Purpose of the Study:

  • To characterize masticatory-cycle morphology and contact glide distance in adults with uncorrected UPXB.
  • To compare these parameters with those of a control group of normal subjects.

Main Methods:

  • Mandibular movements were recorded using a gnathograph during unilateral gum chewing.
  • Traces were analyzed on crossbite and non-crossbite sides in the UPXB group and on both sides in the control group.

Main Results:

Related Experiment Videos

  • Mean contact glide distance was significantly lower on both crossbite and non-crossbite sides in the UPXB group compared to controls.
  • Masticatory cycle morphology was abnormal on the crossbite side in UPXB subjects, differing significantly from non-crossbite and control sides.

    • Conclusions:

    • UPXB is associated with significant alterations in contact glide distance and masticatory cycle morphology.
    • These observed alterations are likely adaptive responses to maintain masticatory function in the presence of crossbite.