Abstract
Statement of problem
Currently, dental articulators can recreate mandibular movements and occlusal contacts.
However, whether virtual articulators can also provide information about occluding
dental surfaces, functional movements, and the mandibular condyles is unclear.
Purpose
The purpose of this in vitro study was to evaluate the occluding surfaces on dental
casts obtained from a patient and approximate them to a hemispherical contact model.
Both models were tested by digitizing the Dentatus ARL dental articulator.
Material and methods
A combination of photogrammetry and structure from motion methods were used to scan
a Dentatus ARL articulator and representative dental casts. Using computer-aided engineering
and finite element analysis, contact points and action vectors to the forces on occluding
surfaces and condyles were obtained for cast and hemispherical models. This experiment
was performed using centric occlusion and 3 different condylar inclinations. The Kruskal-Wallis
1-way analysis of variance on ranks test was used to allow all pairwise comparisons
between condylar inclination and mechanical action vector values in each location
(α=.05).
Results
Action vectors from the cast model and each location of the hemispherical model were
calculated to show the mechanical consequences and the similarity among models. Overall,
no significant differences were observed for action vectors (A20 versus A40 versus
A60) at each location (dental cast/hemisphere, right condylar, and left condylar)
in the analysis of dental casts and the hemisphere model (.382≤P≤.999).
Conclusions
This study provided graphical information that may assist the dental professional
in determining which occlusal contacts should be modified to attain condylar and balanced
centric occlusion.
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Article info
Publication history
Published online: September 27, 2017
Identification
Copyright
© 2017 by the Editorial Council for The Journal of Prosthetic Dentistry.
