[Chewing pattern in posterior crossbite. Classification of chewing pattern in the frontal plane]

Area of Science:

• Dental occlusion
• Masticatory biomechanics
• Oral physiology

Context:

• Posterior crossbite is a malocclusion affecting chewing.
• Understanding chewing patterns is crucial for diagnosing and treating malocclusions.
• Previous research has not fully elucidated the specific chewing patterns associated with posterior crossbite.

Purpose:

• To analyze the relationship between chewing patterns and posterior crossbite occlusion.
• To compare chewing movements in individuals with posterior crossbite and normal occlusion.
• To identify specific chewing patterns prevalent in posterior crossbite subjects.

Summary:

• Chewing movements of 22 posterior crossbite subjects and 5 normal subjects were recorded using a Sirognathograph Analyzing System II.
• Subjects chewed soft gum on specified sides, with crossbite subjects chewing at both the crossbite and non-crossbite regions.
• Analysis revealed a lower frequency of normal chewing patterns in the posterior crossbite group, with a higher prevalence of 'Concave Type', 'Crossover I Type', 'Crossover II Type', and 'Reverse Type' patterns.

Impact:

• Findings indicate that posterior crossbite significantly alters chewing patterns, deviating from normal masticatory function.
• Specific abnormal chewing patterns are characteristic of posterior crossbite, potentially impacting jaw mechanics and dental health.
• This research provides insights into the biomechanical adaptations in response to malocclusion, informing potential therapeutic interventions.