Tujuan: Menganalisis pengaruh gangguan sendi temporomandibula terhadap aktivitasotot mastikasi. Metode penelitian: Subjek merupakan pasien dengan tipe wajahdolichofacial berusia 15 - 35 tahun yang belum melakukan perawatan ortodonti, yaitu 11dengan gangguan sendi temporomandibula dan 11 tanpa gangguan senditemporomandibula sebagai kontrol. Pemeriksaan elektromiografi pada otot masseter dantemporalis anterior dilakukan dengan menginstruksikan pasien menggigit cotton rollsselama 5 detik. Perhitungan Root Mean Square dari pemeriksaan EMG masing-masingotot dibandingkan dengan uji T tidak berpasangan dan uji korelasi Spearman. Hasil:Terdapat perbedaan yang signifikan antara akticvitas otot kanan masseter, kiri masseter,dan kanan temporalis anterior pada pasien maloklusi dengan dan tanpa gangguan senditemporomandibula yang memiliki tipe wajah dolichofacial. Terdapat korelasi negatifantara otot mastikasi tersebut dengan gangguan sendi temporomandibula. Kesimpulan:Pasien dolichofacial dengan gangguan sendi temporomandibula memiliki aktivitas ototmasseter dan otot temporalis anterior yang lebih lemah jika dibandingkan dengan pasientanpa gangguan sendi temporomandibula

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Objectives: This study aimed to analyze the influence of temporomandibular joint

disorder (TMD) on surface electromyography activity in the masticatory muscles.

Methods: Dolichofacial patients (n = 22) aged 15 to 35 years were examined: 11 with

TMD and 11 control subjects without TMD. A standardized surface electromyography

recording was performed on the masticatory muscle during 5 s of maximum voluntary

clenching on cotton rolls. The root mean square value of each muscle was calculated and

analyzed for differences using an unpaired Student’s t-test. Spearman’s correlation

coefficients (r) were calculated for the determination of correlations between TMD and

root mean square values. Results: Surface electromyography revealed significant

differences in the right temporal, right and left masseter during maximum voluntary

clenching. Both sides of the masseter and right temporal also showed a negative

correlation with TMD. During maximum voluntary clenching, TMD patients had

relatively lower elevator muscle activity. Conclusions: Electromyographic activities in

the masseter muscles were lower in dolichofacial patients with TMD than non-TMD

controls. Surface electromyography of masticatory muscles may assist the clinical

assessment of TMD patients.