In Vivo and In Vitro Natural Frequency Analysis of Periodontal Conditions: An Innovative Method

Abstract

Our results suggested that natural frequency is an important parameter for assessing the periodontal condition and that the modal testing technique is a useful supplemental method for assessing the attachment conditions of the periodontium.

Finite Element Analysis of the Dynamic Response of the Maxillary Molar under Impact Loading

“…According to the literature concerning tooth mobility, the vibration frequency of a tooth in the periodontal system is related with the level of periodontal attachment [4,8]. The present study shows that the resonant frequency of the maxillary molar decreases gradually with the loss of alveolar bone under impact loading, while the resonant amplitude increases nonlinearly.…”

“…And the shape of the second mode was in the buccal-lingal way which was the direction also the impact loading in. The resonant frequency has relations with the periodontal tissue condition [4,8]. In order to investigate the relationship between the resonant frequency and the alveolar bone loss, the height of periodontal attachment was defined to describe the condition of alveolar bone loss and the level of periodontal attachment.…”

“…Many methods are used to evaluate the PDL condition, for example radiographic examination, masticatory pressure and tooth mobility. The dynamic behavior of a tooth in the periodontal system reflects the important parameters for assessing the periodontal tissue condition: the damaged condition of periodontium and the level of periodontal attachment [3,4]. The dynamic response of a tooth with the PDL is strongly related to the application force and the excitation direction when the vibrational properties of the tooth is used to describe the condition of the periodontium [5].…”

“…The mechanism by which the strain energy is gradually converted to another energy form is known as damping. Some investigations focus on the calculation or measuring of the natural frequency and the damping of a tooth subjected to an external excitation [1,3,4] in vivo and in vitro. But the dynamic behavior of a molar excited by an impact force has not been well explored.…”

Biomechanical analysis of restored teeth with cast intra-radicular retainer with and without ferrule

“…The lamina dura was represented with mechanical properties equal of the cortical bone and as a uniform layer of 0.25 mm thickness as well as the periodontal ligament (Lee et al, 2000).…”