Proposed score for occlusal-supporting ability

Abstract

<p> <span style="font-size:12px;font-family:Verdana;">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).</span> </p

&lt;i&gt;In Vitro&lt;/i&gt; Simulation of Tooth Mobility Resulting from Periodontal Attachment Loss

“…The objective of the current in vitro study was to analyze tooth mobility resulting from periodontal attachment, based on the results of our previous studies [5]- [7]. It was concluded that nPLI at two-thirds of normal attachment and greater, and rPLI at less than two-thirds of normal attachment should be applied, respectively.…”

“…Thus, rPLI should be applied below two-thirds of the normal attachment. In the future, the availability of OSA score [7], based on nPLI and rPLI, will be evaluated by epidemiologic research on the progression of tooth loss and prostheses survival rate.…”

“…Further, the results of our prior analyses indicated that the occlusal pressure of individual teeth can be used as an indicator of OSA. Moreover, to illustrate the applicability of nPLI and rPLI, an OSA score calculated using these indices for the remaining teeth, and corresponding to Eichner's subclasses of partial edentulism, was charted by numerically assessing the average occlusal support [7]. The resulting OSA score, based on nPLI and rPLI, was proposed as a suitable tool for epidemiologic research on the progression of tooth loss and the survival rate of prostheses.…”

“…Since it is difficult to conduct this research in patients with periodontal attachment loss, we performed an in vitro simulation of tooth mobility resulting from periodontal attachment loss. Consequently, the purpose of this in vitro study was to analyze tooth mobility resulting from periodontal attachment loss, based on our previous studies [5]- [7], and to determine the application range of both nPLI and rPLI.…”

A pilot study on the comparative evaluation of residual periodontal ligament in extracted teeth of chronic periodontitis patients with and without type 2 diabetes – Vital function of an occult dimension

“…This could be attributed to the canine’s larger root surface area, which provides more anchorage than incisors; similarly, premolars and molars provide more anchorage than incisors. [ 11 , 12 ] Another factor is reduced salivary secretion observed in people with diabetes can further aggravate the consequence of plaque and calculus deposition on the gingiva disrupting the integrity of a healthy periodontal ligament. [ 13 - 15 ]…”