Clinical Research
Comparative evaluation of sagittal inclination of the occlusal plane with Frankfort horizontal plane in facebow transfers to semiadjustable and fully adjustable articulators

https://doi.org/10.1016/j.prosdent.2018.12.024Get rights and content

Abstract

Statement of problem

The optimal procedure for the transfer of the sagittal inclination of the occlusal plane (OP) to semiadjustable and fully adjustable articulators is unclear.

Purpose

The purpose of this clinical study was to evaluate and compare the sagittal inclination of the OP with the Frankfort horizontal plane (FHP) on a facebow transfer to semiadjustable and fully adjustable articulators.

Material and methods

Facebow transfers (Hanau Spring-Bow; Whip Mix Corp) of 30 participants were recorded and transferred to a semiadjustable articulator (Hanau Wide-Vue; Whip Mix Corp) using the indirect method. Another set of facebow transfers from the same set of 30 participants using another facebow (Denar Slidematic Facebow; Whip Mix Corp) was recorded and transferred to a fully adjustable articulator (Denar D5A; Whip Mix Corp). The angle between the OP of the mounted cast and the upper member of the articulator was measured in each participant with a digital protractor on both articulators. Standardized lateral cephalograms of each participant were made as a control. The FHP and OP were traced on each standardized lateral cephalogram. The angle on the cephalogram between the FHP and OP was measured. These values were compared with previously measured values for the Hanau Wide-Vue and the Denar D5A articulators. The data were analyzed using ANOVA. Intergroup comparisons between and among the Hanau Wide-Vue, Denar D5A, and lateral cephalograms were performed using the independent t test.

Results

No statistically significant difference was found between the Hanau Wide-Vue and Denar D5A articulators compared with the lateral cephalograms (P=.06). In the intergroup comparison, no statistically significant differences were found between the Hanau Wide-Vue and Denar D5A articulators (P=.18). No statistically significant differences were found between the values obtained on the Hanau Wide-Vue and lateral cephalograms (P=.06). When the Denar D5A articulator was compared with the lateral cephalograms, there was a statistically significant difference (P=.02).

Conclusions

The Hanau Wide-Vue articulator most closely replicated the inclination of the OP. Regarding the sagittal inclination of the OP, the semiadjustable articulator can provide more accurate results than a fully adjustable articulator and thus eliminates occlusal errors.

Section snippets

Material and methods

For the present study, 30 dentulous participants, 18 to 30 years of age, of either sex, were enrolled. Ethics approval was obtained from the Research Ethics Committee of the Sinhgad Dental College and Hospital (Pune, India). The participants voluntarily agreed to participate in the study after the proposed research had been explained to them on an informational/consent sheet.

The study was performed in 2 parts. In the first part, 2 sets of irreversible hydrocolloid impressions (Zelgan 2002;

Results

The mean and standard deviation measures of SIOP (in degrees) recorded using the Hanau Wide-Vue, Denar D5A articulators, and lateral cephalogram are presented in Table 1. In the Hanau group, SIOP varied from a minimum of 4.5 degrees to a maximum of 15.9 degrees (mean 10.0 degrees). In the Denar group, SIOP varied from a minimum of 2.7 degrees to a maximum of 16.4 degrees (mean 9.2 degrees). The Hanau Wide-Vue articulator most closely resembled the cephalometric OP and positioned the OP almost

Discussion

When the Hanau Wide-Vue and the Denar D5A articulators were compared with lateral cephalograms, there was a statistical difference in the values; therefore, the null hypothesis was rejected. Variation in the OP orientation was observed in both articulators; however, the Hanau Wide-Vue articulator most accurately replicated the inclination of the OP.

In this study, the inclination of the maxillary OP was measured with a digital protractor on the articulator. The minimum SIOP measured on the Hanau

Conclusions

Based on the findings of this clinical study, the following conclusions were drawn:

  • 1.

    The Denar D5A articulator provided a significantly flatter OP than that recorded using either a lateral cephalogram or the Hanau Wide-Vue articulator.

  • 2.

    The sagittal inclination of the OP obtained using the Hanau Wide-Vue more closely approximated the sagittal inclination of the OP found on the lateral cephalogram.

  • 3.

    Regarding the sagittal inclination of the OP, a semiadjustable articulator (Hanau Wide-Vue) can provide

References (17)

There are more references available in the full text version of this article.

Cited by (8)

View all citing articles on Scopus
View full text