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PERIO - Periodontal Practice Today
PERIO - Periodontal Practice Today 5 (2008), No. 3     18. Nov. 2008
PERIO - Periodontal Practice Today 5 (2008), No. 3  (18.11.2008)

Page 197-203

Radiographic evaluation of the alveolar bone level change before and after crown-lengthening procedures in a dental school setting
Chi, Jackie / Susarla, Srinivas M. / Kim, David M. / Karimbux, Nadeem Y.
Purpose: The purpose of the present study was to conduct a radiographic evaluation of the magnitude of alveolar bone height change following crown-lengthening surgery performed in a dental school setting, and to monitor the effects of the level of experience of the operators.
Study design: A total of 158 previously crown-lengthened patients were randomly selected from the patient pool. Clinicians included faculty members (general dentists and periodontists), pre-doctoral students, post-doctoral periodontal residents and general practice residents.
Results: A total of 245 teeth underwent crown-lengthening procedures (several of the patients had multiple crown-lengthened teeth), and both pre- and post-periapical radiographs were collected, along with demographic, tooth-related and operative predictor variables. Of the 245 crown-lengthening procedures performed during the study interval, complete data were available for 57 procedures (23.3%). No single predictor variable was uniformly associated with a change in alveolar bone heights on both the mesial and distal aspects. In addition, no statistically significant results were obtained between level of operator expertise and magnitude of bone reduction. The mean change in mesial alveolar bone height was 9.5%, and the mean change for the distal height was 6.3%. These changes were statistically significant (P<0.001).
Conclusions: The results of the present clinical investigation demonstrated that over a period of 2 to 12 months, surgical crown-lengthening procedures resulted in statistically significant changes in alveolar bone heights.

Keywords: alveolar bone level, crown lengthening, radiographic evaluation