scholarly journals Correlation between mandibular morphology and masticatory muscle thickness in normal occlusion and mandibular prognathism

2020 ◽  
Vol 46 (5) ◽  
pp. 313-320
Author(s):  
Tae-Ho Kim ◽  
Chul-Hwan Kim
Keyword(s):  
Muscle Thickness ◽  
Masticatory Muscle ◽  
Mandibular Prognathism ◽  
Normal Occlusion ◽  
Mandibular Morphology

scholarly journals Mandibular prognathism attenuates brain blood flow induced by chewing

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Hiroyuki Kanzaki ◽  
Satoshi Wada ◽  
Masao Kumazawa ◽  
Yuko Yamada ◽  
Tomomi Sudo ◽  
...  
Keyword(s):  
Blood Flow ◽  
Brain Function ◽  
Near Infrared ◽  
Inferior Frontal Gyrus ◽  
Brain Blood Flow ◽  
Functional Near Infrared Spectroscopy ◽  
Mandibular Prognathism ◽  
Normal Occlusion ◽  
Calculation Task ◽  
The Relationship

AbstractMastication is closely related to brain function. Animal experiments have revealed that tooth loss has a negative influence on brain function. Clinical studies also suggest that normal occlusion is an essential factor for favorable brain function. Mandibular prognathism (MP) usually results in occlusal dysfunction. However, the relationship between MP and brain function remains unclear. In the present study, we examined the relationship between MP and brain function by measuring brain blood flow (BBF). Seventeen subjects with normal occlusion (NORM) and 25 patients with MP participated in this study. The number of occlusal contacts were counted. Electromyography of the masseter muscles during clenching was also recorded. BBF was measured with non-invasive functional near-infrared spectroscopy during calculation task and chewing task. The number of the occlusal contacts and masseter muscle activity were lower in MP compared with NORM. The calculation task increased BBF in both groups. The chewing task also increased BBF in the inferior frontal gyrus in both groups, although the increase in MP was smaller than in NORM. We discovered that patients with MP exhibited a smaller increase in BBF at the inferior frontal gyrus during chewing as compared with NORM. As such, MP would negatively affect brain function.

Human Masticatory Muscle Volume and Zygomatico-mandibular Form in Adults with Mandibular Prognathism

2002 ◽  
Vol 81 (11) ◽  
pp. 752-756 ◽  
Author(s):  
N. Kitai ◽  
Y. Fujii ◽  
S. Murakami ◽  
S. Furukawa ◽  
S. Kreiborg ◽  
...  
Keyword(s):  
Masticatory Muscles ◽  
Muscle Volume ◽  
Zygomatic Arch ◽  
Masticatory Muscle ◽  
Mandibular Ramus ◽  
Cross Sectional ◽  
Temporal Fossa ◽  
Mandibular Prognathism ◽  
Masseter Muscles ◽  
Area And Volume

Although several investigators have reported associations between masticatory muscles and skeletal craniofacial form, there is no agreement on the association. We tested the hypothesis that masticatory muscle volume correlates with the size and form of the adjacent local skeletal sites. For this purpose, we investigated the morphological association of the cross-sectional area and volume of temporal and masseter muscles with zygomatico-mandibular skeletal structures using computerized tomography (CT) in 25 male adults with mandibular prognathism. Muscle variables significantly correlated with widths of the bizygomatic arch and temporal fossa but not with the cranium width. Masseter volume significantly correlated with cross-sectional areas of the zygomatic arch and mandibular ramus. Masseter orientation was almost perpendicular to the zygomatic arch and mandibular antegonial region. The zygomatic arch angle significantly correlated with the antegonial angle. The results of the study suggest that the masticatory muscles exert influence on the adjacent local skeletal sites.

Evaluation of Changes in Muscle Thickness, Bite Force and Facial Asymmetry during Early Treatment of Functional Posterior Crossbite

2010 ◽  
Vol 34 (4) ◽  
pp. 369-374 ◽  
Author(s):  
Paula Midori Castelo ◽  
Maria Beatriz Duarte Gavião ◽  
Luciano José Pereira ◽  
Leonardo Rigoldi Bonjardim
Keyword(s):  
Early Treatment ◽  
Repeated Measures ◽  
Muscle Thickness ◽  
Facial Asymmetry ◽  
Bite Force ◽  
Mixed Dentition ◽  
Stepwise Multiple Regression ◽  
Masticatory Muscle ◽  
Maxillary Expansion ◽  
Posterior Crossbite

Objective: To determine morphological and functional effects on masticatory system of early treatment of functional posterior crossbite in young children. Study design: 23 children were divided into two groups:deciduous (DecG, n=11) and early mixed dentition (MixG, n=12), which received slow maxillary expansion. Maximal bite force, ultrasonographic masticatory muscle thickness and facial asymmetry were evaluated in three stages: before the start of treatment (s1), after three months of retention (s2), and after three months of observation (s3). The results were analyzed by Mann-Whitney U-test, correlation test, repeated measures ANOVA and backward stepwise multiple regression. Results. Bite force and temporalis thickness increased from s1 to s2 and s3 in both groups (p<0.05). Body mass index (BMI) increased significantly from s1 to s3 only in the MixG, but the masseter thickness did not differ among the stages. The correlation between the angle of the eye and the angle of the mouth in relation to the mid-sagital plane increased from s1 to s3. Masticatory muscle thickness contributed significantly to bite force magnitude in all stages, whereas age and BMI showed no significant contribution to its variation. Conclusion: Bite force and temporalis muscle thickness increased significantly in children after early treatment of functional crossbite.

scholarly journals Comprehending the three-dimensional mandibular morphology of facial asymmetry patients with mandibular prognathism

2017 ◽  
Vol 18 (1) ◽  
Author(s):  
Hideki Kamata ◽  
Norihisa Higashihori ◽  
Hiroki Fukuoka ◽  
Momotoshi Shiga ◽  
Tatsuo Kawamoto ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Facial Asymmetry ◽  
Mandibular Prognathism ◽  
Mandibular Morphology

scholarly journals Chewing-induced Increase of Brain Blood Flow in Mandibular Prognathism Was Less Compared to Normal Occlusion

2021 ◽  
Vol 31 (3) ◽  
pp. 172-180
Author(s):  
HIROAKI NAKAMURA ◽  
HIROYUKI KANZAKI ◽  
YUKO YAMADA ◽  
MASUMI MURAKAMI ◽  
ERIKA OZAWA ◽  
...  
Keyword(s):  
Blood Flow ◽  
Brain Blood Flow ◽  
Mandibular Prognathism ◽  
Normal Occlusion

scholarly journals Mandibular morphology and pharyngeal airway space: A cephalometric study

2014 ◽  
Vol 5 ◽  
pp. 22-28 ◽  
Author(s):  
Siddharth Mehta ◽  
Surendra Lodha ◽  
Ashima Valiathan ◽  
Arun Urala
Keyword(s):  
Upper Airway ◽  
Normal Subjects ◽  
Cross Sectional Study ◽  
Craniofacial Morphology ◽  
Cross Sectional ◽  
Mandibular Prognathism ◽  
Pharyngeal Airway ◽  
Significant Difference ◽  
Mandibular Morphology ◽  
Mandibular Retrognathism

Introduction Mandibular retrognathism is considered to be the most important risk factor for upper airway obstruction. Aim This cross-sectional study intended to examine the relationship between craniofacial morphology and the pharyngeal airway space (PAS) in patients with mandibular retrognathism and mandibular prognathism, when compared to normal subjects. The study also analyzed the influence of mandibular morphology on pharyngeal length (PL). Materials and Methods The PAS was assessed in 92 females (age 15-30 years) further divided into three groups - Group 1- normal mandible (76°≤ SNB ≤82°; n = 31); Group 2-mandibular retrognathism (SNB <76°; n = 31); Group 3-Mandibular prognathism (SNB >82°; n = 30). All subjects were examined by lateral cephalometry with head position standardized using an inclinometer. Craniocervical angulation, uvula length, thickness and angulation were compared among different groups. Results The results showed no statistically significant difference in the pharyngeal airway between the three groups. Measurements of PL showed statistically significant higher values for retrognathic mandible group than normal and prognathic mandible group. Conclusion There is no significant difference between PAS between patients with mandibular retrognathism, normal mandible and mandibular prognathism. Mandibular retrognathism patients show a significantly higher uvula angulation than patients with mandibular prognathism. Craniocervical angulation showed maximum value in retrognathic mandible group followed by normal and prognathic mandible group respectively. Mean PL for retrognathic mandible patients was significantly higher than prognathic mandible patients.

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