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Mandibular flexure associated with muscle force applied in the retruded axis position
Journal of Oral Rehabilitation
|May 1, 1981
Summary
This study measured mandibular flexure during jaw movements using an anterior jig. Results show minimal horizontal flexure, suggesting dental restorations may need adjustments for mandibular resilience.
Area of Science:
- Biomechanical Engineering
- Dental Mechanics
- Craniofacial Anatomy
Background:
- Understanding mandibular biomechanics is crucial for accurate dental restorations.
- Previous research has not fully quantified horizontal mandibular flexure during functional movements.
Purpose of the Study:
- To measure horizontal plane mandibular flexure during jaw recordings.
- To assess the impact of mandibular flexure on dental restoration accuracy.
Main Methods:
- Utilized an anterior jig (Lucia, 1964) for Rapid Anterior Programming (R.A.P.) recordings.
- Employed chin-point guidance and patient-applied muscle force.
- Measured arch-width changes at the tooth level to infer mandibular flexure.
Main Results:
- Mean lateral mandibular flexure in the horizontal plane was 0.073 +/- 0.028 mm.
- Mean medial flexure during wide opening movements was 0.093 +/- 0.044 mm.
- Observed flexure indicates potential for occlusal interferences in restorations.
Conclusions:
- Mandibular flexure, though small, can influence dental restorations.
- Current articulator technology may require modifications to account for mandibular resilience.
- Restorations based on R.A.P. recordings need careful consideration of mandibular flexure.