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Incisor and mandibular movement during retrusion
P L Foglio-Bonda1, G Migliaretti, F Cavallo
1Dental Clinic University of Eastern Piedmont, Novara, Italy. odonto@maggioreosp.novara.it
Archives of Oral Biology
|February 28, 2006
Summary
Mandibular retrusion, a key jaw movement, is present in nearly all healthy adults. This finding suggests dental treatments should better account for this physiological movement.
Area of Science:
- Dentistry
- Biomechanics
- Orofacial Function
Background:
- Jaw muscle activities, temporo-mandibular joints, ligaments, and dental contacts direct human oro-facial functions.
- Mastication is typically assessed using border movements of mandibular incisors, with retrusion rarely studied.
- Understanding mandibular movements is crucial for diagnosing and treating temporo-mandibular disorders.
Purpose of the Study:
- To evaluate the prevalence and characteristics of mandibular retrusion in a healthy adult population.
- To determine if dental class, age, or gender influence mandibular retrusion.
- To highlight the clinical significance of mandibular retrusion in dental treatments.
Main Methods:
- Electrognathographic registrations were used to measure mandibular movements in 238 subjects.
- Measurements were calculated on sagittal plane registrations following specific subject training.
- A 3-way ANOVA model was employed to analyze the data.
Main Results:
- Mandibular retrusion was observed in 97.9% of the studied subjects.
- The width of retrusion ranged from 0.3 to 5.4 mm, with a mean of 1.75 mm.
- No significant differences in retrusion values were found based on dental class, gender, or age.
Conclusions:
- Mandibular retrusion is a common physiological movement in healthy adults.
- Current dental treatment approaches may not adequately consider the physiological characteristics of mandibular retrusion.
- Further attention to mandibular retrusion is recommended in dental practice to ensure patient well-being.