Abstract
In our previous studies, we developed the normal periodontal ligament index (nPLI) and residual periodontal ligament index (rPLI) to estimate residual periodontal ligament support for individual teeth during treatment planning for partially edentulous patients. To illustrate the applicability of the nPLI and rPLI, an occlusal-supporting ability (OSA) score calculated using these indices for the remaining teeth corresponding to Eichner’s subclasses of partial edentulism was charted by numerically assessing the average occlusal support. This OSA score based on the nPLI and rPLI is proposed as a suitable tool for epidemiologic research on the progression of tooth loss and the survival of prostheses. The Ethics Committee for Epidemiologic Study of Hiroshima University approved the study protocol (No. 331).
Highlights
Clinical assessment of the occlusal support of any residual dentition is an integral part of prosthodontic treatment planning
We developed the normal periodontal ligament index and residual periodontal ligament index to estimate residual periodontal ligament support for individual teeth during treatment planning for partially edentulous patients
To illustrate the applicability of the normal periodontal ligament index (nPLI) and residual periodontal ligament index (rPLI), an occlusal-supporting ability (OSA) score calculated using these indices for the remaining teeth corresponding to Eichner’s subclasses of partial edentulism was charted by numerically assessing the average occlusal support. This OSA score based on the nPLI and rPLI is proposed as a suitable tool for epidemiologic research on the progression of tooth loss and the survival of prostheses
Summary
Clinical assessment of the occlusal support of any residual dentition is an integral part of prosthodontic treatment planning. When designing fixed and removable partial dentures, the occlusal support of the remaining teeth is usually assessed on the assumption that these teeth have normal optimal periodontal ligament support [3]. Yamamoto et al [4] demonstrated that formulae derived for estimating the residual root surface area attached to the periodontal ligament for each tooth type can be used to assess tooth prognosis along with other factors such as mobility, oral hygiene, degree of inflammation, and occlusion. To verify the suitability of this index for prosthodontic treatment planning such as selecting abutment teeth, establishing criteria for tooth extraction, choosing implants, and determining the optimal extent of the denture base areas, it is necessary to accumulate fundamental clinical data about the OSA of each tooth type. Based on our previous studies [5,6,7,8], a score based on nPLI and rPLI values is proposed to estimate the OSA of the remaining teeth
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