Intraocclusal distance between the anterior teeth in intercuspal position

Area of Science:

• Dental occlusion
• Biomechanics
• Oral physiology

Background:

• Understanding intercuspal occlusal contacts is crucial for diagnosing and treating various dental conditions.
• The relationship between masticatory muscle activity and occlusal contact patterns requires further investigation.

Purpose of the Study:

• To quantify intraocclusal distance in complete dentition under varying masseter muscle contraction levels.
• To investigate the influence of electromyography (EMG) levels on occlusal contact thickness.

Main Methods:

• Silicone impressions were used to record intercuspal occlusal contacts in 20 subjects.
• A computer-aided video system analyzed silicone thickness, correlating light transmission to interocclusal distance.
• Masseter muscle activity was maintained at 10% and 30% of maximum EMG levels.

Main Results:

• Intraocclusal distance was consistently greater in anterior teeth compared to posterior teeth.
• Canine teeth exhibited an intermediate intraocclusal distance between incisors and posterior teeth.
• Increasing EMG levels led to a reduction in intraocclusal distances across all tooth types.

Conclusions:

• Tooth contact thickness varies across different regions of the dentition.
• Masticatory muscle activity significantly influences the measured intraocclusal distances.
• These findings contribute to a better understanding of occlusal dynamics and force distribution.