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Anatomical Considerations to Improve Aesthetic Treatments Using Neuromodulators
Published in Yates Yen-Yu Chao, Optimizing Aesthetic Toxin Results, 2022
Nicholas Moellhoff, Sebastian Cotofana
The shape of the chin corresponds mainly to the underlying mentalis muscle (Figure 11.6). It has its bony origin inferior to the labiomental sulcus. The muscle fibers travel inferiorly and insert directly into the dermis. Mentalis muscle contraction elevates the chin and everts the lower lip. Dimpling of the overlying skin can occur due to the dermal fiber insertions.
Facial anatomy
Published in Michael Parker, Charlie James, Fundamentals for Cosmetic Practice, 2022
The mentalis muscles are found as a pair located at the symphisis menti. They originate from the anterior mandible and insert into the chin. They function to wiggle the soft tissues anterior to the chin as well as allow pouting. They are therefore responsible for wrinkles demonstrated centrally under the bottom lip as well as on the chin. Its innervation is from the mandibular branches of the facial nerve, and it receives its arterial blood supply from the mental artery, which itself is a branch of the inferior alveolar which itself is borne from the maxillary artery. The maxillary artery emerges from the mental foramen, which can be found deep to the mentalis muscle. See Figure 3.24.
The lower third of the face
Published in Jani van Loghem, Calcium Hydroxylapatite Soft Tissue Fillers, 2020
The mentalis muscle may be treated with botulinum toxin to reduce dimpling and anterior projection. The treatment can be done prior to the CaHA application, in order to reduce risk of muscular contraction associated migration of the CaHA product. After projecting the chin, the entire infraoral area should be assessed and potentially adjusted by injecting additional CaHA or other fillers in the mental crease, pre-jowl sulcus, and/or marionette lines.
Correlation between collum angle and lower lip position in different Class II malocclusions - A retrospective cephalometric study
Published in Orthodontic Waves, 2021
Prasanna Arvind T.R., A. Sumathi Felicita
In Class II div 1, the collum angle was least in magnitude when the anterior one-third of the lip was in contact with the incisor incisal tip. A gradual continuous labial tipping force applied on the incisal edges could be one of the reasons for the increased magnitude of the negative value. The magnitude was highest when the posterior-third was in contact with the incisal tip. This could also indicate a mild intrusive force applied due to the increased surface area meeting the incisal edge. These findings confirm the probable role of the lower lip as an etiologic factor in the collum angle values. There remains a great deal of variation in the manner of lip closure in patients with dentofacial disharmonies. Failure to establish a proper lower lip relationship to the incisor is a major factor of relapse in Class II malocclusions. During lip closure, the lower lip seems to reach for the upper lip along with considerable contraction of the mentalis muscle by avoiding contact with the upper central incisor. This manner of flattening of the lip along the labial surface of the incisor could also play a vital role in stability post-treatment [20].
Evaluation Criteria and Surgical Technique for Transoral Access to the Thyroid Gland: Experimental Study
Published in Journal of Investigative Surgery, 2019
Alexander M. Shulutko, Vasiliy I. Semikov, Elkhan G. Osmanov, Sergey E. Gryaznov, Anna V. Gorbacheva, Alla R. Patalova, Gaukhar T. Mansurova, Airazat M. Kazaryan
Unlike all the other widespread remote extracervical types of surgical access, the present type of surgical access is less traumatic due to the smaller area of detachment in the skin and muscle flap.26–29 The short muscles located over the thyroid gland lobe are not crosscut but are dislocated laterally with further fixation using the piercing ligature. The muscle structures within the chin area are also minimally traumatized—partial crosscutting is applied to the bundles of the mentalis muscle and the platysma muscles (in the area of mental protuberance). It is necessary to fit together and suture the incised bundles of the mentalis muscle to avoid the postoperative formation of lower lip ptosis. Creating an operating cavity in the neck area using the lifting method excludes the development of possible complications related to gas insufflation. In clinical practice one should expect the development of sensitivity disorders in the chin area and swelling of the anterior neck segments. Nakajo et al. reported that the swelling was resolved within several days and the sensitivity in the chin area within 6 months after the operation.21
A three-dimensional soft tissue analysis of Class III malocclusion: a case-controlled cross-sectional study
Published in Journal of Orthodontics, 2018
Ama Johal, Amrit Chaggar, Li Fong Zou
The facial angle was found to be greater in the Class III groups when compared to the control groups, reaching significance between the ages of 11 and 13 years. An increased facial angle is indicative of relative maxillary retrusion or mandibular prognathism, leading to increased mid-facial convexity. As observed in the deciduous and early mixed dentition, the older male and female Class III subjects demonstrated significantly increased mandibular length and retrognathic maxilla (Krneta et al. 2014, 2015). Antero-posterior cephalometric skeletal analyses have indicated that the maxilla is more retrusive in Class III subjects and coupled with an increased level of lower lip protrusion, established in the deciduous dentition (Battagel 1993; Krneta et al. 2014). The latter has been described and attributed to a lack of activity of the circumoral muscles and hypofunction of the mentalis muscle in Class III subjects (Seren 1990). This finding is supported by a large study by Baccetti et al. (2007) who analysed 1091 lateral cephalograms to show that the lower lip tended to protrude in relation to Ricketts E-line in Class III subjects. The shell-to-shell analysis used in the present study has been able to validate the changes seen in the lower lip of the Class III subjects.