| Abstrakt: |
BACKGROUND: After the loss of natural teeth, replacement of teeth by prosthodontic services becomes a vital part in the modern day living. They provide effective mastication and esthetics. To make it more proficient both biologically and functionally, they are accommodated in particular geometric manner referred to as a dental arch form. The objective of this study is to compare the distance between the most prominent part of labial surface of maxillary central incisors with the posterior limit of the incisive papilla in various arch forms. STUDY DESIGN: Cross sectional In-vitro experimental study. PLACE AND DURATION OF STUDY : Department of Prosthodontics, Dr. Ishrat ul Ebad Khan Institute of Oral Health Sciences, DUHS, Karachi, Pakistan from March 2012 to August 2012. METHODOLOGY: 203 College students from third and final years were selected with symmetric faces and all teeth present except third molars. Subjects with malformed teeth, periodontal problems, orthodontic treatment or restorations on the labial tooth surfaces were excluded. After sample selection, impressions were made for upper and lower arches and the resultant casts were standardized for each sample. Arch forms were assessed by their morphological description. Measurements were recorded for incisive papilla (IP) and maxillary central incisor (CI) distance for papillo-incisal distance (PID) with a modified digital vernier caliper with the casts placed on a flat horizontal surface. The fixed jaw blade of the vernier caliper was extended 10 mm from the original for effective measurements. RESULTS: The mean PID was 11.06 mm ± 1.46. Among the subjects were 90.6% had ovoid, 3.9% had squarish and 5.4% had tapering arch forms. Mean PID for Ovoid arches were found to be 11.04mm, Tapering 10.84mm and Squarish 12.02mm. CONCLUSION: The suggested mean PID for placing prosthetic central incisors is 11.06mm. There is a higher presentation of ovoid arch forms. [ABSTRACT FROM AUTHOR] |
