Prediction of the alveolar bone level after the extraction of maxillary anterior teeth with severe periodontitis

다국어 초록 (Multilingual Abstract)

Purpose: After extraction, the alveolar bone tends to undergo atrophy in three-dimensions.
The amount of alveolar bone loss in the horizontal dimension has been reported to begreater than the amount of bone loss in the vertical dimension, and is most pronounced inthe buccal aspect. The aim of this study was to monitor the predictive alveolar bone levelfollowing the extraction of anterior teeth seriously involved with advanced chronic periodontitis.
Methods: This study included 25 patients with advanced chronic periodontitis, whose maxillaryanterior teeth had been extracted due to extensive attachment loss more than oneyear before the study. Periapical radiographs were analyzed to assess the vertical level ofalveolar bone surrounding the edentulous area. An imaginary line connecting the mesialand the distal ends of the alveolar crest facing the adjacent tooth was arbitrarily created.
Several representative coordinates were established in the horizontal direction, and thevertical distance from the imaginary line to the alveolar crest was measured at each coordinatefor each patient using image analysis software. Regression functions predicting thevertical level of the alveolar bone in the maxillary anterior edentulous area were identifiedfor each patient.
Results: The regression functions demonstrated a tendency to converge to parabolicshapes. The predicted maximum distance between the imaginary line and the alveolar bonecalculated using the regression function was 1.43±0.65 mm. No significant differenceswere found between the expected and actual maximum distances. Likewise, the predictedand actual maximum horizontal distances did not show any significant differences. Thedistance from the alveolar bone crest to the imaginary lines was not influenced by the mesio-distal spans of the edentulous area.
Conclusions: After extraction, the vertical level of the alveolar ridge increased to becomecloser to the reference line connecting the mesial and distal alveolar crests.

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