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    Age Related Changes of Superior Orbicularis Oris Muscle in Terms of Tone and Viscoelastic Properties
    (Lippincott Williams & Wilkins, 2022) Ramazanoglu, Engin; Turhan, Begumhan; Usgu, Serkan
    Objective: To examine the age-related changes in the viscoelastic properties and tone of the superior orbicularis oris muscle by a portablehand-held myotonometer. Methods: A total of 128 individuals (65 female, 63 male) who met the inclusion criteria were evaluated. Individuals were divided into 2 groups as under 40 years old (Group 1), and above (Group 2). The viscoelastic properties and muscle tone of orbicularis oris muscle were evaluated bilaterally in supine position with the Myoton PRO (Myoton AS, Estonia) device from the skin overlying the orbicularis oris. The reference point is accepted as the right and left paramedial philtrum dimple. The statistical analysis was performed. Results: There was no statistically significant difference in the elasticity values of the right and left orbicularis oris muscles of the Group 1 and Group 2 individuals. There was a difference between the groups when the tone and stiffness values of both groups were compared. It was determined that individuals over the age of 40 had higher muscle tone and stiffness. All mechanical properties of the superior orbicularis oris muscle between the male and female individuals in Group 1 were different. The values are higher in the female gender. The elasticity values in both genders in Group 2 were similar. Tone and stiffness parameters were different between genders. Conclusions: Myoton PRO can be recommended as an alternative device in the quantitative evaluations of post-operative follow-ups, and pre/post rehabilitation in terms of viscoelastic parameters of the muscle.
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    Evaluation of the tone and viscoelastic properties of the masseter muscle in the supine position, and its relation to age and gender
    (Wroclaw Medical Univ, 2021) Ramazanoglu, Engin; Turhan, Begumhan; Usgu, Serkan
    Background. The masseter muscle can be evaluated in various ways to examine its condition in healthy individuals or to identify pathological changes in the muscle. Objectives. This study aimed to examine the tone and viscoelastic parameters of the masseter muscle, which is the focal muscle of various pathologies, to reveal its relationship with age and gender, and to determine the reference values of this muscle in healthy individuals. Material and methods. Individuals aged 18-50 years were evaluated. They were divided into 3 groups in terms of age. A total of 389 individuals participated in the study (18-28 years: 131 males, 104 females; 29-39 years: 29 males, 56 females; and 40-50 years: 30 males, 39 females). The tone and viscoelastic properties of the masseter muscle were evaluated bilaterally in the supine position. Results. The mean age of all individuals was 28.64 +/- 9.68 years. The masseter muscle tone was found to be higher in men than in women. The elasticity of the muscle was higher in women (p < 0.05). It was determined that the masseter muscle tone and stiffness increased, whilst its elasticity decreased with aging (p < 0.05). A weak positive correlation was found between the right and left masseter muscle tone and age (r = 0.307 and r = 0.325, respectively; p = 0.001). There was a moderate positive correlation between the right and left masseter muscle stiffness and age (r = 0.507 and r = 0.511, respectively; p = 0.001). A strong positive correlation was observed between the right and left masseter muscle elasticity and age (r = 0.614 and r = 0.645, respectively; p = 0.001). Conclusions. The data obtained in this study may assist clinicians in evaluating the treatment of the pathological conditions related to the masseter muscle as well as in the planning of treatment and pre- and post-operation evaluations.