Study of a classification of occlusion

Area of Science:

• Dentistry
• Biomedical Engineering
• Biomechanics

Background:

• A functional classification of occlusion, based on tooth contact sounds, was established in 1970.
• This classification proved useful in identifying patients with gnathic dysfunctions, with Class C showing a higher prevalence than Class A.

Purpose of the Study:

• To investigate other occlusal parameters beyond sound duration to differentiate between functional occlusion classes (Class A and Class C).
• To validate the functional classification of occlusion based on occlusal sound characteristics.

Main Methods:

• Measured occlusal sound patterns and masseter muscle activity in Class A and Class C subjects.
• Analyzed coordination through the coincidence of sound patterns and F-tests on successive occlusal sounds.
• Assessed time intervals between sounds and silent periods in relation to muscle activity.

Main Results:

• Significant differences in sound pattern coordination were found between Class A and Class C.
• Differences diminished with prolonged sound series, indicating improved stability with successive contacts.
• Significant differences in masseter muscle activity were linked to the presence or absence of silent periods between occlusal sounds.

Conclusions:

• The functional classification of occlusion based on occlusal sound duration is valid.
• Occlusal sound characteristics and associated muscle activity provide further differentiation between functional occlusion classes.