“Variability and Validity of the Anterior Point of Reference”-A Cephalometric Study Joshi Sanjeev Kumar*, Reader, Gupta Gaurav, Professor & Head, Bansal Sucheta, Asstt. Professor, Gupta Preeti, Professor Address for Correspondence: Dr. Sanjeev Kumar Joshi, Department of Prosthodontics Including Crown And Bridge & Implantology, Himachal Institute of Dental Sciences And Research Paonta Sahib, Himachal Pardesh, India
Online published on 7 December, 2011. Abstract Statement of problem The literature has suggested the relation of various anterior point of references to the orbitale. This study was undertaken to evaluate the validity and variability of the anterior point of reference. Material and mathods Eighty subjects in the age of 25–30 years from the student body of HIDS, Paonta Sahib, Dist. Sirmour (HP) were selected from the study. The orbitale was located and the nasion was the second selected point that was marked on the deepest part of the concavity on the bridge of the nose. The points were marked with the barium sulphite, a radio opaque substance. After marking the points the subjects were positioned within Cephalostat. Cephalometric landmarks were traced on an acetate paper with the aid of viewing box. Registration crosses were marked to allow for re-orientation and reverification of various readings for analysis. Results A) It was concluded from the main study that mean difference between the frankfort horizontal plane and the axis orbital plane 6.44mm which was statistically significant with no variability in sex. B) The mean distance between nasion and orbitale was 30. fmmwhich was statistically significantwith no variability in the sex. C) The mean distance between externally marked orbitale and the maxillary incisal edges was 46.35mm which was statistically significant with no variability in the sex. D) This correspond to the middle groove in the hanau H2 and 145 series and to the upper grove in the balanced deluxe articulators (Hagerwerken). E) The externally marked point 7mm below the orbitale corresponded to the infra orbital foramen and a plane between this point and the axis was found to be parallel to the Frankfurt horizontal plane rather than the axis orbital plane. Conclusion Mounting of the cast in the articulator with the aid of a facebow is of greatest significance both from the diagnostic and a prosthetic reconstruction point of view. Hence, the correct selection of the anterior point of reference and the plane of occlusion is axiomatic to achieve the desired occlusal and esthetic results. Top Keywords Anterior Point Of Reference, Orbitale, Nasion. Top |