Effect of a novel rotation coordinating device on registered horizontal condylar guidance of nonarcon semi‑adjustable articulators

Abstract

Background: Horizontal condylar guidance (HCG) is registered by protrusive interocclusal records
but in nonarcon articulators, these records can affect the accuracy. The present study aimed to
evaluate the effect of a novel rotation coordinating device (RCD) on condylar guidance setting
with protrusive interocclusal records.
Materials and Methods: The study was designed as a comparative in-vitro investigation.
Stone maxillary and mandibular casts were mounted on a fully adjustable instrument as the patient.
Duplicate casts were mounted on an arcon and a nonarcon articulator with corresponding face
bow records and in maximum intercuspation relation. Five different condylar guidance inclinations
for both sides (20°, 30°, 40°, 50°, and 60°) were set on the fully adjustable instrument and 16
protrusive interocclusal records were established at each setting. HCG was set for arcon, nonarcon
articulators, and nonarcon articulators with RCD. Data were analyzed using one‑sample t‑test to
compare with actual HCG and one‑way analysis of variance (α =0.05).
Results: Mean HCG for studied articulators was 35.40 for arcon, 30.31 for nonarcon without RCD,
and 35.61 for nonarcon with RCD which were significantly different from actual HCG (P < 0.05).
HCG of the nonarcon with RCD showed no significant difference with arcon articulator (P = 0.71)
while both were significantly different from nonarcon without RCD (P < 0.001).
Conclusion: “The RCD” compensates the condylar guidance inclination difference between arcon
and nonarcon articulators. The device precisely transfers the hinge movement of the upper member
of the articulator to the condylar track.
Key Words: Articulator, mandibular condyle jaw relation records, occlusal adjustment

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Farbod Manshaee: Pubmed,Google Scholar