[A study on the differences in function of free-sided and unilateral chewing]

Area of Science:

• Dentistry
• Biomechanics
• Human Physiology

Background:

• Unilateral chewing is associated with increased chewing strokes and food particle storage.
• The comparative masticatory efficiency of free-sided (bilateral) versus unilateral chewing remains unclear.

Purpose of the Study:

• To elucidate the functional differences between free-sided and unilateral chewing methods.
• To quantify the impact of chewing strategy on masticatory efficiency.

Main Methods:

• 116 dentate subjects with normal occlusion compared chewing strokes for peanuts.
• Saliva secretion, occlusal force, and posterior tooth contact points were measured.
• Subjects were grouped (high/low score) based on these parameters to analyze chewing efficiency.

Main Results:

• Free-sided chewing required 10% fewer strokes than unilateral chewing overall.
• Fewer strokes were consistently observed with free-sided chewing across both high and low score groups.
• Significantly less coarse food particles remained with free-sided chewing in low saliva and occlusal force groups.

Conclusions:

• Free-sided chewing demonstrated greater efficiency than unilateral chewing.
• Fewer chewing strokes are needed for effective food breakdown with free-sided chewing.
• Reduced residual food particles indicate improved masticatory performance with free-sided chewing.