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Occlusal contacts in mandibular retrusion.

J Wilson, R I Nairn

The International Journal of Prosthodontics

|March 1, 1989

Summary

This study measured mandibular retrusion in dental professionals, finding an average of 0.2 mm between maximum intercuspal and most retruded positions. This suggests a need to consider mandibular axes of opening in dental assessments.

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Area of Science:

Dentistry
Biomechanics
Dental Occlusion

Background:

Understanding the relationship between different mandibular positions is crucial for diagnosing and treating occlusal issues.
Previous research has explored mandibular movements, but precise measurement of retrusion at the occlusal level requires further investigation.

Purpose of the Study:

To quantify the degree of mandibular retrusion between the maximum intercuspal position (MIP) and the most retruded mandibular position (MRP).
To investigate the relationship between MIP and MRP in individuals with intact dentitions.

Main Methods:

A photographic method was employed to measure retrusion.
Measurements were taken at the occlusal surfaces of posterior teeth in 15 participants.
Participants were dental students and nurses with intact dentitions and well-defined intercuspation.

Main Results:

An average mandibular retrusion of approximately 0.2 mm was observed between MIP and MRP.
The study noted a relatively large 'apparent' retrusion, prompting further analysis.

Conclusions:

The findings provide quantitative data on mandibular retrusion in a specific population.
The observed retrusion necessitates a discussion regarding the mandibular axes of opening and their influence on occlusal relationships.

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