TITLE:
In Vitro Simulation of Tooth Mobility Resulting from Periodontal Attachment Loss
AUTHORS:
Yasuhiko Abe, Keisuke Nogami, Keisuke Yasuda, Yohei Okazaki, Kyou Hiasa
KEYWORDS:
Tooth Mobility, Periodontal Attachment Loss
JOURNAL NAME:
Open Journal of Stomatology,
Vol.4 No.6,
June
25,
2014
ABSTRACT: In our previous studies, we developed the normal periodontal ligament index (nPLI) and the residual periodontal ligament index (rPLI), to estimate residual periodontal ligament support for individual teeth during treatment planning for partially edentulous patients. The purpose of the current in vitro study was to analyze tooth mobility resulting from periodontal attachment loss, and to determine the application range of both nPLI and rPLI. The association of horizontal load-displacement and conditions of attachment loss was measured in triplicate for each anatomical tooth model at 10-minute intervals, using a universal tester at a crosshead speed of 0.05 mm/min, and a load of 0.1 N. The conditions of attachment loss were: (I) 0 mm (cementoenamel junction), (II) 2 mm attachment level, and (III) two-thirds, and (IV) one-half lengths of normal attachment. Except for the upper first molar, lower lateral incisor, lower first premolar, and the lower first molar, the displacement of each tooth type was increased significantly relative to Level I (P P