Application of mechanical mobility of periodontal tissues to tooth mobility examination

Abstract

Tooth mobility examination is important in planning dental treatment, as it may give an indication of alveolar bone loss and the condition of the periodontal ligament. In clinical dental diagnosis a manual tooth mobility examination is useful. However, its determination of tooth mobility is subjective and depends on the skill and experience of the clinician. The authors have previously reported on a device for measuring the biomechanical properties of human periodontium using an impedance head. Using this device, the mechanical mobility of periodontium can be measured and the mechanical parameters of the periodontal physical model are obtained. Tooth mobility is defined objectively on the basis of discriminant scores of mechanical parameters, and a mobility triangle (MT) figure is drawn as a record for visual interpretation. The paper describes the validation of the mechanical mobility measurements and their interpretation using mobility parameters and a personal computer to produce a mobility triangle figure. The method is compared favourably with clinical mobility measurement. The relationship of the model to underlying pathology is tested by measurements performed on various tooth model systems.

Damping effects on the response of maxillary incisor subjected to a traumatic impact force: A nonlinear finite element analysis

“…13 Therefore, in Fig. 7, the larger that the damping ratio of the upper incisor model is, the lower the peak stress induced.…”

“…[12][13][14] In these studies, after simplifying a natural tooth to a mechanical model, damping properties of the tooth were determined mathematically by curve-fitting the experimental data to the vibrational behavior of the mechanical model. However, such a reversed calculation is an indirect method of damping property determination.…”

Effect of damping properties on fracture resistance of root filled premolar teeth: a dynamic finite element analysis

“…Damping factor is a nonlinear property of a viscous material. It is defined as the fraction of strain energy lost in one full cycle of deformation (Oka et al. 1989).…”

“…Damping factor is a nonlinear property of a viscous material. It is defined as the fraction of strain energy lost in one full cycle of deformation (Oka et al 1989). Therefore, a tooth with a higher damping ratio can dissipate more strain energy when it is subjected to a load.…”

Untitled

“…To measure implant instability, mobility tests and devices for quantitative detection, such as the Periotest (Siemens AG, Germany), have been developed. Periotest is designed to assess tooth mobility and monitor implant stability via the damping characteristics of the periodontal ligament [6,7]. Unfortunately, because the Periotest value is strongly related to the excitation direction and location, readings from this device correspond imprecisely to the biomechanical parameters.…”