Reproduction accuracy of articulator mounting with an arbitrary face-bow vs. average values-a controlled, randomized, blinded patient simulator study
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Reproduction accuracy of articulator mounting with an arbitrary face-bow vs. average values-a controlled, randomized, blinded patient simulator study. / Ahlers, M Oliver; Edelhoff, Daniel; Jakstat, Holger A.
In: CLIN ORAL INVEST, Vol. 23, No. 3, 03.2019, p. 1007-1014.Research output: SCORING: Contribution to journal › SCORING: Journal article › Research › peer-review
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TY - JOUR
T1 - Reproduction accuracy of articulator mounting with an arbitrary face-bow vs. average values-a controlled, randomized, blinded patient simulator study
AU - Ahlers, M Oliver
AU - Edelhoff, Daniel
AU - Jakstat, Holger A
PY - 2019/3
Y1 - 2019/3
N2 - 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.
AB - 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.
KW - Journal Article
U2 - 10.1007/s00784-018-2499-6
DO - 10.1007/s00784-018-2499-6
M3 - SCORING: Journal article
C2 - 29926254
VL - 23
SP - 1007
EP - 1014
JO - CLIN ORAL INVEST
JF - CLIN ORAL INVEST
SN - 1432-6981
IS - 3
ER -