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Clinical Oral Investigations

, Volume 23, Issue 3, pp 1007–1014 | Cite as

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

  • M. Oliver AhlersEmail author
  • Daniel Edelhoff
  • Holger A. Jakstat
Original Article
  • 182 Downloads

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.

Keywords

Jaw relation record/instrumentation Methods, reproducibility of results, confidence intervals, analysis of variance, evidence-based dentistry Dental occlusion, vertical dimension Dental articulators, face-bow 

Notes

Acknowledgements

The authors would like to express their heartfelt thanks to the dental students at the University of Leipzig who participated in the study as test persons, as well as to Mr. Christian Pala and Ms. Brigitte Münzner, Certified Dental Technicians at the University of Leipzig, who skillfully prepared the 152 casts. Special thanks also to Tom Kennedy, Boston, for his support in refining the manuscript as native speaker, as well as to Agnieszka Tarkowska, Hamburg, for refining and proofreading the manuscript.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Informed consent

For this type of study, formal consent is not required.

Supplementary material

784_2018_2499_MOESM1_ESM.xls (18 kb)
ESM 1 (XLS 17 kb)
784_2018_2499_MOESM2_ESM.jnb (365 kb)
ESM 2 (JNB 365 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Prosthetic DentistrySchool of Dental and Oral Medicine, University Hospital Hamburg-Eppendorf, University of HamburgHamburgGermany
  2. 2.CMD-Centre Hamburg-EppendorfHamburgGermany
  3. 3.Department of Prosthetic DentistryUniversity Hospital, LMU Ludwig-Maximilians-UniversityMunichGermany
  4. 4.Preclinical Education and Dental Materials, Department of Prosthetic Dentistry, School of Dental and Oral Medicine, Medical FacultyUniversity of LeipzigLeipzigGermany

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