Reproducibility of centric jaw relation record for edentulous patients

Abstract EN

Background and objectives Centric jaw relation still remains one of the controversial issues in prosthodontics.

The aim of this study was to measure the variability of centric relation records utilizing three clinically accepted methods: Swallowing, chin point guidance and bimanual manipulation.

Methods 30 edentulous (45-65) aged patients were participated in this study and divided into 3 groups, 10 for each method.

The centric jaw relation was recorded by unguided swallowing and a midline was marked on graph paper fixed on the anterior and lateral sections of the bite section rims.

5 records were obtained from each patient per method.

The deviation of midline in the medio-lateral axis were measured by the digital Vernier to the nearest 0.01mm and magnifier mounted on fixed distance from using the articulator.

Data were extracted and analyzed statistically using SPSS version.

Results Variability within subjects ranged from 0.5mm for the swallowing method to 1.5mm of the chin point guidance.

There was no statistically difference (p > 0.05) among the three methods for measuring lateral displacement.

The bimanual manipulation showed the most reproducible method (P< 0.05).

Conclusion based on the results of this study, it may be concluded that the studied techniques demonstrated different variability degrees.

The bimanual manipulation method can be considered the most reproducible from the three methods.