• 제목/요약/키워드: Unilateral mastication

검색결과 20건 처리시간 0.025초

COMPARATIVE ELECTROMYOGRAPHIC ANALYSIS OF MASTICATORY MUSCLES BETWEEN BILATERAL AND UNILATERAL MASTICATORS

  • Na Sun-Hye;Kang Dong-Wan
    • 대한치과보철학회지
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    • 제40권6호
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    • pp.577-589
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    • 2002
  • There are several variations in normal mastication. In them, unilateral mastication is chewing, predominantly on a preferred side of the dentition and hardly on e non-preferred side. Continual unilateral mastication may alter the coordination of masticatory muscles. Although they studied about these EMG of masticatory muscles, there were no information about characteristics of masticatory muscle activity in unilateral mastication. Therefore, In this study, we investigated the activity of the masseter and anterior temporal muscles during rest, clenching in maximum intercuspation and gum chewing in habitually unilateral mastication group compared with normal group and tried to know effects of continual unilateral mastication on activity of masticatory muscles. The results of this study were as follows 1. In electromyographic activity during rest, in bilateral mastication group pattern of muscle activity of right and left side was symmetrical. But, in unilateral mastication group, records of anterior part of temporal muscle was higher than that of bilateral mastication group (p<.01) and patterns of muscle activity of right and left side in both muscle were asymmetrical.(p<.05) 2. In electromyographic activity during clenching in maximum intercuspation, records of superficial part of masseter muscle were higher than anterior part of temporal muscle in both group. Muscle activity of temporal muscle in unilateral mastication group was a little higher han bilateral mastication group and asymmetry of activity pattern in temporal and masseter muscle was shown but these differences were not statistically significant. (p<.05) 3. In electromyographic activity during gum chewing, temporal muscle was activated earlier than masseter muscle and maximum bite force is derived from masseter muscle in both group. In unilateral mastication group, electromyographic activity of masseter and temporal muscle of preferred chewing side, regardless of right or left side chewing, was higher than that of bilateral mastication group and especially, difference in masseter muscle was statistically significant. (p<.01) Based on the above results, our study suggested that recording of masticatory muscle activity will be helpful in the effective diagnosis and treatment of some types of the parafunctional habits.

Pattern analysis of patients with temporomandibular disorders resulting from unilateral mastication due to chronic periodontitis

  • Jeon, Hye-Mi;Ahn, Yong-Woo;Jeong, Sung-Hee;Ok, Soo-Min;Choi, Jeomil;Lee, Ju-Youn;Joo, Ji-Young;Kwon, Eun-Young
    • Journal of Periodontal and Implant Science
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    • 제47권4호
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    • pp.211-218
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    • 2017
  • Purpose: The purpose of the present study was to perform a pattern analysis in patients with temporomandibular disorder (TMD) resulting from unilateral mastication due to chronic periodontitis. Methods: Thirty participants with signs or symptoms of TMD who engaged in unilateral mastication due to periodontitis-related discomfort (test group) were selected. Another 30 subjects exhibiting signs or symptoms of TMD resulting from unilateral mastication not due to chronic periodontitis (control group) were also recruited. An interview-based questionnaire was administered, and an examination of the temporomandibular joint (TMJ) with determination of periodontal status was performed. Results: The duration of unilateral mastication was significantly longer in the control group than in the test group. There was a significant negative correlation between the duration of unilateral mastication and the Community Periodontal Index score. Using the Research Diagnostic Criteria for TMD (RDC/TMD) axis I algorithms, all the subjects were assigned to 3 main groups. The test group exhibited significantly a higher diagnostic distribution of group III (arthralgia, osteoarthritis, or osteoarthrosis), and in both the test and control groups, the number of diagnoses was larger for the non-chewing side. The control group showed a significantly higher diagnostic distribution of group I (myofacial pain), and in both the test and control groups, the number of diagnoses was larger for the chewing side. Conclusions: The results of the present study indicate that unilateral mastication due to chronic periodontitis could induce not only pain but also structural TMJ changes if adequate treatment is not administered and supported within a short time from the onset of the condition. Therefore, immediate treatment of chronic periodontitis is recommended to prevent not only the primary progress of periodontal disease, but also secondary TMJ-related problems. Furthermore, subjects who have suffered chronic long-term periodontitis without treatment should be urged to undergo a TMJ examination.

정상 성인 여성에 있어 실험적 견치부 등척성편측교합에 의한 동통성 증상 발현 현상 (A Feature of Producing the Symptom Complex Related to Pain and Discomfort by the Experimental Isometric Unilateral Canine Biting in Adult Females within Normal Masticatory Function)

  • 이정연;신금백
    • Journal of Oral Medicine and Pain
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    • 제12권1호
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    • pp.53-61
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    • 1987
  • In order to evaluate the effect of unilateral tooth clenching, the author observed a feature of producing the symptom complex related to pain and discomfort by the isometric unilateral canine biting under force of 5kg(FS) in Korean 31 adult females within normal masticatory function who were divided into the bilateral, the right and the left group according to their habitual sides of mastication, and analyzed the observed data statistically. The obtained results were as follows: 1. The duration of the isometric unilateral canine biting maintained before the occurrence of symptom complex related to pain and discomfort 66.72 seconds at right side and 39.50 seconds at left side in a group of subjects with bilateral habitual mastication. And the difference of the duration between of unilateral biting side was almost significant (P<0.05). 2. The most frequent region of occurrence of symptom complex related to pain and discomfort by the isometric unilateral canine biting was the contralateral superficial masseter muscle in a group of subjects with bilateral habitual mastication.

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Effect of Bi-/Unilateral Masticatory Training on Memory and Concentration - Assessor-blind, Cross-over, Randomized Controlled Clinical Trial

  • Bae, Jun-hyeong;Kim, Hyungsuk;Kang, Do Young;Kim, Hyeji;Kim, Jongyeon;Kim, Koh-Woon;Cho, Jae-Heung;Song, Mi-yeon;Chung, Won-Seok
    • 대한한의학회지
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    • 제43권2호
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    • pp.61-74
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    • 2022
  • Objectives: This study aimed to explore the short-term effects of bilateral masticatory training using an intraoral device on memory and concentration, which is an advanced form of Gochi, compared to the unilateral form with gum. Methods: Thirty young healthy participants (age, 16-30 years) were screened and randomly assigned to one of two sequences in a crossover design. The participants assigned to sequence A (n=15) performed bilateral mastication using an intraoral device with a total of 300 taps, followed by unilateral mastication using gum with the same number of repetitions and frequency, separated by a 7-day washout period. A reverse order was used for sequence B. The primary and secondary outcomes were the digit span test result and the symbol digit modality test and the word list recall results, respectively, which were conducted before and after each intervention. Results: Symbol digit modality test scores increased by 12.03±8.33 with bilateral mastication, which was significantly higher than that obtained with chewing gum (5.17 points;95% confidence interval: 0.99, 9.34; p<0.05). Changes in the digit span test and word list recall scores were not significantly different between the two groups. In the digit span test forward, symbol digit modality test, and word list recall test, bilateral mastication was not inferior to unilateral mastication in improving memory and concentration. Conclusions: Bilateral masticatory exercises using an intraoral device are not inferior to unilateral mastication with gum for improving memory in healthy young individuals. Further research is needed to determine the efficacy of bilateral masticatory training on cognitive function.

Immediate Effects of Asymmetric Chewing on Temporomandibular Joint Kinematics

  • Tae-Joon Um;Han-Seung Choi;Dong Yeop Lee;Jae Ho Yu;Jin Seop Kim;Seung Gil Kim;Jiheon Hong
    • The Journal of Korean Physical Therapy
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    • 제35권6호
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    • pp.185-189
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    • 2023
  • Purpose: This study investigated the immediate biomechanical effects of unilateral mastication for 10 minutes on the temporomandibular joint (TMJ) with 21 healthy adult participants. Methods: The gum group chewed gum on the right side for 10 minutes, and the control group rested for 10 minutes. Biomechanical data were obtained using a three-dimensional infrared camera before and after intervention. An independent t-test assessed the variation of kinematic data to identify differences between before and after intervention. Results: Among biomechanical variables, the gum group's length of the left forehead middle region and the temporomandibular joint angle decreased compared to the control group (p<0.05). Conclusion: Caution with unilateral masticatory activity is recommended, as unilateral mastication causes biomechanical changes due to excessive load on the soft tissues of the contralateral TMJ.

E.M.G를 이용한 무치악에서의 저작근에 대한 연구 (An Electromyographic Study on the Edentulous Patients)

  • 이승우
    • Journal of Oral Medicine and Pain
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    • 제2권1호
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    • pp.8-16
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    • 1974
  • The author performed electromyographic analysis on edentulous patients aging 52 to 77 who have upper and lower full dentures for 3 to 7 years of duration. And the graphs were recorded in physiologic rest position, incisal occlusion, molar occlusion, left lateral excursion, right lateral excursion and mandibular projection. The results obtained are as follows : 1. 80 per cent of the patients are in unilateral mastication. 2. The shorter history of edentulous mouth reveals the more electric potency. 3. Facial deviation owing to unilateral mastication is the cause of higher electric potency to the deviated site. 4. There were no difference in electric potency between mandibular projection and incisal occlusion.

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Focal Atrophy of the Unilateral Masticatory Muscles Caused by Trigeminal Neuropathy from the Tumor in the Foramen Ovale

  • Juhyung Hong;Jin-Woo Chung
    • Journal of Oral Medicine and Pain
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    • 제47권4호
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    • pp.217-221
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    • 2022
  • Neurogenic muscular atrophy is muscle wasting and weakness caused by trauma or disease of the nerve that innervates the muscle. We describe a case of unilateral trigeminal neuropathy and neurogenic muscular atrophy of the masticatory muscle caused by a tumor in the foramen ovale. A 59-year-old man visited our clinic complaining of difficulty in right-sided mastication. There were no evident clinical signs and symptoms of temporomandibular disorder. However, severe atrophy of the right masseter and temporalis muscles and hypesthesia of the right side mandibular nerve area were confirmed. Through T1 and T2 signals on magnetic resonance imaging (MRI), a mass suspected of a neurogenic tumor was observed in the foramen ovale and cavernous sinus. Severe atrophy of all masticatory muscles on the right side was observed. This rare case shows trigeminal neuropathy caused by a tumor around the foramen ovale and atrophy of the ipsilateral masticatory muscles. For an accurate diagnosis, it is essential to identify the underlying cause of muscle atrophy with neurologic symptoms present. This can be done through a more detailed clinical examination, including sensory testing and brain MRI, and consider a referral to neurology or neurosurgery for the differential diagnosis of the intracranial disorder.

총의치 환자의 만족도에 대한 연구 (A CLINICAL STUDY ON THE SATISFACTION OF COMPLETE DENTURE PATIENTS)

  • 김형우;김정희;김영수
    • 대한치과보철학회지
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    • 제33권3호
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    • pp.440-452
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    • 1995
  • A success of complete denture prosthesis can be determined by the satisfaction degree of the dentist and the patient. There are many factors influencing on the satisfaction of the complete denture patients. The purpose of this study is to analyze the correlation between the masticatory satisfaction and clinical evaluation, and the speech satisfaction and clinical evaluation in complete denture patients. 79 patients(total 119 complete dentures) were examined in this study who were treated in Seoul National University Dental Hospital. Through clinical evaluation, 2 examiners evaluated sex, age, edentulous period, the years of having used present complete denture, the number of the previous dentures, the state of the opposite arch, retention, stability, support, occlusion, vertical dimension of the complete denture and the condition of the residual alveolar ridge. Through questionnaires concerned with mastication and speech, examiners evaluate the satisfaction degree of the patients. This study led to the conclusion that : 1. The satisfaction degree of the mastication was lower in older patients(p<0.001) and in patients whose present complete denture period was shorter(p<0.05). The satisfaction degree of the mastication in male was higher than in female patients(p<0.01). 2. The satisfaction degree of the mastication was high when the retention of the complete denture was good(p<0.05), and when the condition of the residual alveolar ridge was good(p<0.05). 3. The satisfacion degree of the speech was high when the retention of the complete denture was good(p<0.01). 4. The satisfaction degree of the mastication was higher in patients with upper and lower complete denture than in patients with single complete denture whose oppsite arch was unilateral partial denture(p<0.05).

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Correlation between Radiographic Findings, Clinical Findings and Joint Sounds of Temporomandibular Joint Osteoarthritis Patients

  • Shin, Jung-Youn;Ahn, Jong-Mo
    • Journal of Oral Medicine and Pain
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    • 제42권2호
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    • pp.35-43
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    • 2017
  • Purpose: This study aims to evaluate the correlation between joint sounds and radiographic bone change patterns along with clinical symptoms of temporomandibular joint osteoarthritis (TMJ OA) patients. Methods: The patients for this study were over 19 years of age, diagnosed tentatively with TMJ OA. The patients were examined with temporomandibular disorders analysis test and all three radiographs, including panoramic radiography, transcranial radiography, and cone beam computed tomography (CBCT). Information of the patients' age, pain status, joint sound and mouth opening range were collected. And bone change pattern was examined by reviewing panoramic radiography, transcranial radiography and CBCT images. Results: The patients with crepitus had a higher average active mouth opening (AMO) range than patients without crepitus, and the group with bilateral crepitus had a higher average AMO range than the group with unilateral crepitus (p<0.001). And the patient with pain during mastication was increased in the group with clicking than the group without clicking, and the group with bilateral clicking showed a statistically significant increase in the patient with pain during mastication than the group with unilateral clicking (p<0.05). The analytical results of the relevance of crepitus showed a high correlation with bone change observed from each of the three radiographs. And the agreement in bone change findings from 3 groups of paired radiographs showed high agreement (p<0.001). Meanwhile, 77.2% of CBCT findings showed bone change of condyle without crepitus (p<0.001). Conclusions: This study presented significant results in the evaluation of the correlation with crepitus and bone change of TMJ OA patients from panoramic radiography or transcranial projection. However, the accurate assessment is required through CBCT for the patient with complains of persistent pain, limitation of mouth opening, and occlusal change even if the crepitus does not exist.

부정유합된 상악골 골절의 처치 (LATE TREATMENT OF MALUNITED MAXILLARY FRACTURE)

  • 장세홍;안재진;김도균;정민원
    • Maxillofacial Plastic and Reconstructive Surgery
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    • 제11권1호
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    • pp.255-260
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    • 1989
  • Unfavorable healing of maxillary fractures may impose functional and esthetic burdens upon the trauma victim. Malunited maxillary fractures are generally a result of treatment delay, incomplete or inaccurate immobilization of the fracture fragments, or infection. Dysfunctions of mastication, distortions in speech, gross defects in facial contour, and related psychic changes are problems which may require secondary correction. When it is necessary to delay definitive treatment or when inadequate maxillary fracture reduction is recognized within the first week following injury, the maxilla can be mobilized by heavy handed dental manipulation under anesthesia or by elastic traction to an external fixation appliance attached to the maxilla by arch bars or an acrylic splint. But malunited maxillary fracture that have progressed to bony malunion require osteotomy procedure in order to establish normal anatomic relationships. This report parents two cases of malunited unilateral maxillary fracture surgically corrected by unilateral Le Fort I osteotomy.

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