1.A Rare Case of Dystrophic Calcification in the Masseter Muscle.
Hyun Ju KIM ; Jin Ho BAE ; Yo Han KIM ; Kyu Sang LEE ; Young Lip PARK ; Kyu Uang WHANG ; Sung Yul LEE ; Jong Suk LEE ; Jung Eun KIM
Korean Journal of Dermatology 2018;56(3):225-227
No abstract available.
Masseter Muscle*
2.Neurilemmoma of the Masseteric Nerve in the Masseter Muscle: A Case Report.
Dong Kook SEO ; Yoong Soo KIM ; Jong Wook LEE ; Young Chul JANG ; Suk Joon OH
Journal of the Korean Society of Plastic and Reconstructive Surgeons 2002;29(1):55-58
A case is reported of neurilemmoma of the right masseteric nerve in the masseter muscle. We experienced a 34-years-old male patient who had neurilemmoma in the masseter muscle caused by chronic irritation. Special stain using S-100 immunoperoxidase was useful in establishing the diagnosis in this case. The most important aspect of this case is the anatomical site of the neurilemmoma; this tumor was originated from the masseteric nerve and is the first case reported in the masseter muscle. The patient underwent surgical excision of the tumor and no recurrence occured.
Diagnosis
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Humans
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Male
;
Masseter Muscle*
;
Neurilemmoma*
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Recurrence
3.Disrupted tenogenesis in masseter as a potential cause of micrognathia.
Chao LIU ; Nan ZHOU ; Nan LI ; Tian XU ; Xiaoyan CHEN ; Hailing ZHOU ; Ailun XIE ; Han LIU ; Lei ZHU ; Songlin WANG ; Jing XIAO
International Journal of Oral Science 2022;14(1):50-50
Micrognathia is a severe craniofacial deformity affecting appearance and survival. Previous studies revealed that multiple factors involved in the osteogenesis of mandibular bone have contributed to micrognathia, but concerned little on factors other than osteogenesis. In the current study, we found that ectopic activation of Fgf8 by Osr2-cre in the presumptive mesenchyme for masseter tendon in mice led to micrognathia, masseter regression, and the disrupted patterning and differentiation of masseter tendon. Since Myf5-cre;Rosa26R-Fgf8 mice exhibited the normal masseter and mandibular bone, the possibility that the micrognathia and masseter regression resulted directly from the over-expressed Fgf8 was excluded. Further investigation disclosed that a series of chondrogenic markers were ectopically activated in the developing Osr2-cre;Rosa26R-Fgf8 masseter tendon, while the mechanical sensing in the masseter and mandibular bone was obviously reduced. Thus, it suggested that the micrognathia in Osr2-cre;Rosa26R-Fgf8 mice resulted secondarily from the reduced mechanical force transmitted to mandibular bone. Consistently, when tenogenic or myogenic components were deleted from the developing mandibles, both the micrognathia and masseter degeneration took place with the decreased mechanical sensing in mandibular bone, which verified that the loss of mechanical force transmitted by masseter tendon could result in micrognathia. Furthermore, it appeared that the micrognathia resulting from the disrupted tenogenesis was attributed to the impaired osteogenic specification, instead of the differentiation in the periosteal progenitors. Our findings disclose a novel mechanism for mandibular morphogenesis, and shed light on the prevention and treatment for micrognathia.
Mice
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Animals
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Micrognathism
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Masseter Muscle
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Mandible
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Osteogenesis
4.Masseter Muscle Activity in Orthodontically Treated Patients with a History of Temporomandibular Joint Disorder: An Electromyographic Study
Nisallina Apridini ; Nia Ayu Ismaniati Noerhadi ; Erwin Siregar
Archives of Orofacial Sciences 2021;16(2):191-198
ABSTRACT
The present study aimed to evaluate the surface electromyography (sEMG) activity of the masseter
muscles in patients with a history of temporomandibular joint disorder (TMJD) who received
orthodontic treatment. In total, 22 participants aged 18–35 years old were included in this study.
They were divided into the control group (patients without a history of TMJD [n = 11]) and the test
group (those with a history of TMJD [n = 11]). Each participant underwent sEMG of the right and
left masseter muscles at 5-s maximum voluntary contraction (MVC). Results showed that the TMJD
group had a lower sEMG activity of masseter muscles at MVC than the non-TMJD group. However, the
differences were not statistically significant (p > 0.05, t-test). The Spearman’s correlation coefficient test
revealed a weak negative correlation between muscle activity on sEMG and history of TMJD (p > 0.05).
In conclusion, orthodontically treated patients in TMJD group have reduced masseter muscle activity
during MVC, compare to the non-TMJD group.
Masseter Muscle
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Orthodontics
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Electromyography
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Temporomandibular Joint Disorders
5.The reproducibility of ultrasonographic assessment of local cross-sectional dimensions of masseter muscle.
Gi Chung CHUNG ; Won Jeong HAN ; Eun Kyung KIM
Korean Journal of Oral and Maxillofacial Radiology 2005;35(2):97-104
PURPOSE: To determine if ultrasonography is a reliable technique to assess masseter muscle sites within intra- and interobserver and the scanning level and/or the muscle condition affect local cross-sectional dismension (LCSD) measurements of masseter muscle. MATERIALS AND METHODS: 10 subjects without sign and symptom of temporomandibular disorders and missing posterior teeth were examined by ultrasonography. Bilateral ultrasonographic examinations were performed with a linear (B-scan) 7.5 MHz small-part transducer to register LCSDs of the masseter muscle on three different levels. Scans were made on relaxed and clenching condition. Three oral and maxillofacial radiologists measured at two sessions with a time interval of at least 5 minutes. RESULTS: Variables such as 'condition' and 'level' had a significant effect on muscle measurements (p< 0.05). There was no significant difference between 'sessions' (p> 0.05) and 'observers' (p> 0.05). LCSDs on lower scan level were significantly thinner than those on upper and middle level. Those on clenching condition were significantly thicker than those on relaxed condition (p< 0.05). The scanning level with the highest reproducibility was middle with clenching condition (ICC = 0.90, MSE = 0.55%). CONCLUSION: The data suggested that ultrasonography was a reliable method for measuring LSCD of masseter muscle in intra- and interobserver and middle scan level showed the most reliable data.
Masseter Muscle*
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Temporomandibular Joint Disorders
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Tooth
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Transducers
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Ultrasonography
6.The effect of pre-operative steroid injection on the relief of complaint after third molar surgery.
Journal of the Korean Association of Oral and Maxillofacial Surgeons 2003;29(3):157-162
BACKGROUND: The surgical removal of impacted mandibular third molar can result in considerable pain, swelling, and dysfunction that patient are incapable of work for several days. Factors contributing to post operative swelling, trismus and pain are complex. There is no question but that the procedure of surgically removing an impacted mandibular third molar is inherently a traumatic one and that some sequelae related to the inflammation response are expected. Meticulous surgical technique will minimize the sequelae of inflammation but will not prevent them. In an effort to minimize these sequelae the use of steroid was instituted. PATIENTS AND METHODS: Present study was to investigate the effect of one preoperative steroid injection in the masseter muscle to the patients(male 9, female 11) who needed prophylactic removal of bilateral , symmetrical, impacted wisdom teeth in the mandible on the complaint like swelling, trismus and pain. through Double-Blind test. RESULTS: 1. After 24 hours investigation, preoperative steroid injection had significantly reduced swelling with 39% and trismus with 57.5%. 2. 7th post operative day investigation, reduced swelling and trismus had shown, however, not significant. 3. There wasn't major difference from the group who took preve-ntive steroid in the visual analogue scale, the first analgesic intake time and the pain period. 4. There wasn't any adverse reaction of steroid for 20 patient From the above result, If the patients are not contraindication to steroid and pronounced post operative reaction can be expected the use of steroid to the surgical removal of impacted mandibular third molar is recommended.
Female
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Humans
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Inflammation
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Mandible
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Masseter Muscle
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Molar, Third*
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Trismus
7.Evaluation of normal masseter muscles on ultrasonography.
Hyoung Zoo HWANG ; Gyu Tae KIM ; Yong Suk CHOI ; Eui Hwan HWANG
Korean Journal of Oral and Maxillofacial Radiology 2008;38(2):73-79
PURPOSE: To assess the internal echo intensity and morphological variability of masseter muscles on ultrasonography and to establish diagnostic criterion of estimation. MATERIALS AND METHODS: Participants consisted of 50 young adults (male 25, female 25) without pathologic conditions and with full natural dentitions. Sonographic examinations were done with real time ultrasound equipment as Logiq 500 (GE Medical Systems, Seoul, Korea) at 3 parts according to lines paralleling with ala-tragus line as reference line. The thickness and area of masseter muscles according to reference line in cross-sectional images were measured at rest and at maximum contraction. The visibility and width of the internal echogenic intensity of the masseter muscles were also assessed and the muscle appearance was classified into 4 types. Data were statistically analyzed by paired t-test and chi-square-test. RESULTS: 1. When comparing the thickness and area of masseter muscles concerning with gender, there was few significant difference between right and left sides, however, there were significant differences between males and females except for the greatest thickness of left side. 2. The changes of the greatest thickness and the area between rest and maximum contraction showed that the part of the least thickness manifested more increase at maximum contraction. 3. Each part the manifestations of the internal echogenic intensity of the masseter muscles were different depending on the locations. But there was no statistically significance. CONCLUSION: Changes of muscles thickness with contraction and internal echogenic intensity with locations showed great disparity within the masseter muscles, which will be diagnostic criteria for pathophysiologic and anatomic changes of masseter muscles.
Contracts
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Dentition
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Female
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Humans
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Male
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Masseter Muscle
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Muscles
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Young Adult
8.Review of the Nomenclature of the Retaining Ligaments of the Cheek: Frequently Confused Terminology.
Yeui Seok SEO ; Jennifer Kim SONG ; Tae Suk OH ; Seong Ihl KWON ; Tanvaa TANSATIT ; Joo Heon LEE
Archives of Plastic Surgery 2017;44(4):266-275
Since the time of its inception within facial anatomy, wide variability in the terminology as well as the location and extent of retaining ligaments has resulted in confusion over nomenclature. Confusion over nomenclature also arises with regard to the subcutaneous ligamentous attachments, and in the anatomic location and extent described, particularly for zygomatic and masseteric ligaments. Certain historical terms—McGregor's patch, the platysma auricular ligament, parotid cutaneous ligament, platysma auricular fascia, temporoparotid fasica (Lore's fascia), anterior platysma-cutaneous ligament, and platysma cutaneous ligament—delineate retaining ligaments of related anatomic structures that have been conceptualized in various ways. Confusion around the masseteric cutaneous ligaments arises from inconsistencies in their reported locations in the literature because the size and location of the parotid gland varies so much, and this affects the relationship between the parotid gland and the fascia of the masseter muscle. For the zygomatic ligaments, there is disagreement over how far they extend, with descriptions varying over whether they extend medially beyond the zygomaticus minor muscle. Even the ‘main’ zygomatic ligament's denotation may vary depending on which subcutaneous plane is used as a reference for naming it. Recent popularity in procedures using threads or injectables has required not only an accurate understanding of the nomenclature of retaining ligaments, but also of their location and extent. The authors have here summarized each retaining ligament with a survey of the different nomenclature that has been introduced by different authors within the most commonly cited published papers.
Cheek*
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Fascia
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Ligaments*
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Masseter Muscle
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Parotid Gland
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Rejuvenation
9.Measurement Method of the Masseter Muscle Volume Using 3D Computed Tomography.
Jung Hwan BAEK ; Jong Woo CHOI ; Sun Kuk YOO ; Yong Oock KIM ; Beyoung Yun PARK
Journal of the Korean Society of Plastic and Reconstructive Surgeons 2005;32(5):589-592
Since G.N. Hounsfield's clinical use of computed tomography in 1971, digital imaging technique using computers has shown an eye opening progress. Progress has made 3-dimensional understanding of not only facial bones but muscles and other connective tissues possible through 3-dimensional reconstruction of preexisting tomographical images. Also, quantitative analysis of density, distance, volume has become possible, allowing objective analysis of preoperative and postoperative states through imaging. The authors measured the masseter muscle volume of 20 normal individuals and 8 female patients through 3-D reconstructive CT imaging and made a statistical analysis of the measurements. The method used in our study may be applied to the diagnosis of disease causing the change of the facial volume and presurgical design as a useful tool to provide objective information on the evaluation of surgery outcome.
Connective Tissue
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Diagnosis
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Facial Bones
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Female
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Humans
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Masseter Muscle*
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Muscles
10.A Case of Hemimasticatory spasm.
Yong J KIM ; Kwang S LEE ; Jung H NA ; Beum S KIM ; Young Jin KO
Journal of the Korean Neurological Association 1994;12(1):175-178
Hemimasticatory spasm is a rare disorder that often accompanies facial hemiatrophy and is characterized by spasm in one or more of the jaw-closing muslces supplied by the fifth cranial nerve. We report a clinical and electrophysiological observation of a patient of hemimasticatory spasm, who presented involuntary spasm on masseter muscle and hemiatrophy of the face on the right side for 7 years.
Facial Hemiatrophy
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Humans
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Masseter Muscle
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Spasm*
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Trigeminal Nerve