Basic and patient-oriented researchExamination of Masticatory Movement and Rhythm Before and After Surgical Orthodontics in Skeletal Class III Patients With Unilateral Posterior Cross-Bite
Section snippets
Patients
Ten adult patients (2 men and 8 women, mean age 26.1 years) with mandibular prognathism, who had been treated orthognathically at Tsurumi University Dental Hospital, were included in the present study.
The inclusion criteria were the diagnosis of skeletal Class III malocclusion with a unilateral posterior cross-bite and the lack of periodontal disease, signs or symptoms of trismus, or extensive dental work, and no current dental treatment. Patients with cleft lip and palate and those with
Masticatory Patterns
The examination of the masticatory movement at T1 demonstrated characteristic masticatory patterns on the cross-bite side. Although subjects with normal occlusion have a high frequency of patterns I, II, and III (grinding pattern),5, 11, 14, 15 most patients in the present study had different masticatory patterns. In the T1 data of the cross-bite side, a high frequency of masticatory patterns IV, VI, and VII and a low frequency of patterns I, II, and III were seen (Table 1, T1). The masticatory
Discussion
Several classifications have been done of the analysis of masticatory movement.4, 5, 11, 15 Proschel and Hofman5 analyzed the masticatory movement in detail and classified it into 196 patterns. It would have been difficult, however, to classify the 10 strokes counted in the present study into 196 patterns. In contrast, Akiyama et al14 proposed a more simple and practical classification system. Their system consists of 2 opening paths, 2 closing paths, regular or irregular, and 8 patterns (Fig 1
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Establishment of a new rehabilitation program using masticatory training food for jaw deformity patients
2022, Journal of Dental SciencesTreatment decision of camouflage or surgical orthodontic treatment for skeletal Class III patients based on analysis of masticatory function
2022, Journal of Dental SciencesCitation Excerpt :Malocclusion with skeletal Class III is characterized by Angle Class III, anterior crossbite, compensatory inclination of incisors for skeletal discrepancy and uni- or bilateral posterior crossbite due to the transverse maxillary deficiency. Several studies have demonstrated that patients with skeletal Class III malocclusion show disorders of masticatory function associated with the malocclusion and jaw deformity; muscle activity,1–3 jaw movement,2–5 masticatory efficacy,1 and bite force.2 However, the effect of the severity of skeletal discrepancy on masticatory functional disorder is not yet clear.
Effects of functional training after orthognathic surgery on masticatory function in patients with mandibular prognathism
2020, Journal of Dental SciencesCitation Excerpt :Transverse maxillary deficiency with a uni- or bilateral crossbite is frequently identified in patients with mandibular prognathism.21 The posterior crossbite was found to play a role in the high frequency of reverse and reverse-crossing chewing type13 and correction of the posterior crossbite was associated with a significant decrease in the high prevalence of reverse chewing type in patients with posterior crossbite.19 On the other hand, previous studies suggested that orthognathic surgery improved the chewing pattern in patients with mandibular prognathism though it remained incomplete, compared with the control.4,14
Effect of denture treatment on masticatory movement in patients with complete dentures
2019, Journal of Prosthodontic ResearchCitation Excerpt :Another pattern is characterized by an opening path from the intercuspal position toward the working side after initially toward non-working side, and a similar closing to Pattern I (Pattern III). The masticatory movement of temporomandibular joint dysfunction (TMD) patients and malocclusion subjects tends to be irregular and unstable, showing abnormal pattern in many cases [6,7,9,10]. However, it has been reported that through dental treatment, the movement may become regular and stable and recover from an abnormal to healthy pattern [6,9].
A standardized rat burr hole defect model to study maxillofacial bone regeneration
2019, Acta BiomaterialiaAn index for the evaluation of 3D masticatory cycles stability
2017, Archives of Oral BiologyCitation Excerpt :The three-dimensional jaw movements during mastication can be analyzed by means of several specific spatiotemporal parameters of each masticatory cycle, as maximum range of motion, total cycle area, opening and closing maximum velocity, cycle duration, vertical, posterior, and right and left jaw movements (Buschang, Hayasaki & Throckmorton, 2000; Ferrario et al., 2006; Lepley, Throckmorton, Parker, & Buschang, 2010; Radke, Kull & Sethi, 2014). Also, the opening and closing phases of the chewing cycles have been subjectively classified in various characteristic patterns, according to the shape and direction of the trajectory, suggesting the existence of relations between the representative types of mandibular trajectories and malocclusions, and even with the presence of TMD (Kobayashi et al., 2009; Naeije & Hofman, 2003; Takeda et al., 2009). Considering the potential ability of selected descriptors of chewing cycles to differentiate among normalcy and various pathologies, but also the variability inherent in each subject, different methods have been used to study within-subject variability, which include the selection of “representative” cycles and the use of statistical approaches (Buschang, Hayasaki & Throckmorton, 2000; Ferrario et al., 2006; Shiga et al., 2009; Wintergerst, Throckmorton, & Buschang, 2008; Wintergerst, Buschang & Throckmorton, 2004).