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21.06.2018 | Original Article | Ausgabe 3/2019

Clinical Oral Investigations 3/2019

Reproduction accuracy of articulator mounting with an arbitrary face-bow vs. average values—a controlled, randomized, blinded patient simulator study

Zeitschrift:
Clinical Oral Investigations > Ausgabe 3/2019
Autoren:
M. Oliver Ahlers, Daniel Edelhoff, Holger A. Jakstat
Wichtige Hinweise

Electronic supplementary material

The online version of this article (https://​doi.​org/​10.​1007/​s00784-018-2499-6) contains supplementary material, which is available to authorized users.

Abstract

Objectives

The benefit from positioning the maxillary casts with the aid of face-bows has been questioned in the past. Therefore, the aim of this study was to investigate the reliability and validity of arbitrary face-bow transfers compared to a process solely based on the orientation by means of average values. For optimized validity, the study was conducted using a controlled, randomized, anonymized, and blinded patient simulator study design.

Material and methods

Thirty-eight undergraduate dental students were randomly divided into two groups; both groups were applied to both methods, in opposite sequences. Investigated methods were the transfer of casts using an arbitrary face-bow in comparison to the transfer using average values based on Bonwill’s triangle and the Balkwill angle. The “patient” used in this study was a patient simulator. All casts were transferred to the same individual articulator, and all the transferred casts were made using type IV special hard stone plaster; for the attachment into the articulator, type II plaster was used. A blinded evaluation was performed based on three-dimensional measurements of three reference points.

Results

The results are presented three-dimensionally in scatterplots. Statistical analysis indicated a significantly smaller variance (Student’s t test, p < 0.05) for the transfer using a face-bow, applicable for all three reference points.

Conclusions

The use of an arbitrary face-bow significantly improves the transfer reliability and hence the validity.

Clinical relevance

To simulate the patient situation in an individual articulator correctly, casts should be transferred at least by means of an arbitrary face-bow.

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