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Movement of Teeth Adjacent to Posterior Bounded Edentulous Spaces

Department of Orthodontics, School of Dentistry, The University of North Carolina, CB# 7450, Chapel Hill, NC 27599-7450, graggk{at}dentistry.unc.edu

D.A. Shugars

Department of Operative Dentistry, School of Dentistry, The University of North Carolina, CB# 7450, Chapel Hill, NC 27599-7450

J.D. Bader

Department of Operative Dentistry and Sheps Center for Health Services Research, School of Dentistry, The University of North Carolina, CB# 7450, Chapel Hill, NC 27599-7450

J.R. Elter

Department of Dental Ecology, School of Dentistry, The University of North Carolina, CB# 7450, Chapel Hill, NC 27599-7450

B.A. White

Kaiser Permanente Center for Health Research Portland, OR

Bounded edentulous spaces (BES)-a missing posterior tooth with intact adjacent teeth-are thought to lead to arch collapse resulting from the movement of adjacent teeth. To determine the rate of change in distance between teeth adjacent to a BES, we examined three successive measurable radiographs of 116 untreated posterior BES cases. The distance between the teeth (DBT) adjacent to the space was measured, and change in DBT (A DBT) between pre-extraction and follow-up radiographs was calculated. We used linear spline regression to construct models for tooth movement and to identify factors associated with A DBT. The mean A DBT was < 1 mm during the first year post-extraction, and the DBT continued to decrease at a successively slower rate each following year. Overall and for each tooth type, the greatest rates of decrease in DBT were seen in the zero to two-year period. In a multivariable model, time since extraction and tooth type were significantly associated with A DBT. These findings suggest that movement of teeth adjacent to a posterior BES after the first two years is usually gradual and minor within the time frame of this study.

Key Words: prosthodontics • arch collapse • missing teeth • tooth movement

Journal of Dental Research, Vol. 80, No. 11, 2021-2024 (2001)
DOI: 10.1177/00220345010800111401


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