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Evaluation of the vertical forces generated by the cervical biteplate facebow
S Braun1, B E Johnson, W P Hnat
1School of Dentistry, University of Louisville, Kentucky.
The Angle Orthodontist
|January 1, 1993
Summary
The biteplate facebow significantly increases molar eruption forces compared to standard cervical facebows, aiding Class II malocclusion correction. Excessive intrusive forces on incisors are noted but may be mitigated by posterior tooth disarticulation.
Area of Science:
- Orthodontics
- Biomechanical Engineering
Background:
- Class II malocclusions with deep overbites are often treated with facebows.
- The biteplate facebow incorporates an inner bow metal plate, acting as a biteplate to prevent full closure.
Purpose of the Study:
- To quantify the force system of the biteplate facebow.
- To compare molar eruptive forces and incisor intrusive forces with the conventional cervical facebow.
Main Methods:
- A test apparatus simulated the biteplate facebow's force system.
- High-resolution force transducers measured incisor intrusive forces.
- Static force analysis calculated first molar vertical force components under varying conditions.
Main Results:
- Biteplate facebow molar eruptive forces were 158%–537% higher than the standard cervical facebow.
- Intrusive forces on maxillary incisors were found to be excessive.
- Counter-clockwise tipping of the occlusal plane due to maxillary molar eruption was predicted.
Conclusions:
- The biteplate facebow achieves overbite correction primarily through maxillary molar eruption and occlusal plane tipping.
- Treatment planning requires careful consideration of patient growth, intrusive force magnitude, and therapeutic goals.