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

Ahlers, M. Oliver; Edelhoff, Daniel und Jakstat, Holger A. (2019): Reproduction accuracy of articulator mounting with an arbitrary face-bow vs. average valuesa controlled, randomized, blinded patient simulator study. In: Clinical Oral Investigations, Bd. 23, Nr. 3: S. 1007-1014

Abstract

ObjectivesThe 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 methodsThirty-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.ResultsThe 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.ConclusionsThe use of an arbitrary face-bow significantly improves the transfer reliability and hence the validity.Clinical relevanceTo simulate the patient situation in an individual articulator correctly, casts should be transferred at least by means of an arbitrary face-bow.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Medizin
• Themengebiete: 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin und Gesundheit
• ISSN: 1432-6981
• Sprache: Englisch