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Comparison of cast positions by using four face-bows
1Department of Removable Prosthodontics, Marquette University, School of Dentistry, Milwaukee, Wis.
The Journal of Prosthetic Dentistry
|January 1, 1988
Summary
This study compared four face-bows for mounting maxillary casts on a semiadjustable articulator. Researchers found significant variability in molar positions, preventing the establishment of clinical superiority for any single face-bow.
Area of Science:
- Dental prosthetics
- Maxillofacial anatomy
- Articulator technology
Background:
- Accurate mounting of dental casts is crucial for prosthetic restorations.
- Semiadjustable articulators are widely used in prosthodontics.
- Face-bows are essential for transferring the maxillomandibular relationship to the articulator.
Purpose of the Study:
- To evaluate the positional accuracy of maxillary first molars when using different face-bows.
- To compare the performance of four specific Hanau face-bows in mounting maxillary casts.
- To determine if any face-bow offers clinical superiority for cast mounting.
Main Methods:
- Four face-bows (Hanau Kinematic, Facia-bow, 159 Earpiece, Twirl Earpiece) were used for mounting.
- A semiadjustable articulator (Hanau H2) was utilized for cast positioning.
- Deviations in molar positions (X, Y, Z axes) were measured against a kinematic hinge-axis baseline using a contour meter.
Main Results:
- Significant variability was observed in the deviations of maxillary molar positions.
- No single face-bow consistently provided superior or more accurate mounting.
- Individual variations in patient anatomy influenced cast mounting outcomes.
Conclusions:
- The study could not establish clinical superiority for any of the tested face-bows.
- Variability in anatomical landmarks among subjects limits the definitive comparison of face-bows.
- Further research may be needed to optimize face-bow technology for consistent dental cast mounting.