Salsabeel Abu Serdaneh1, Manal AlHalabi1, Mawlood Kowash1, Vaughan Macefield2, Ammar H Khamis3, Anas Salami1, Iyad Hussein1. 1. Department of Paediatric Dentistry, Hamdan Bin Mohammed College of Dental Medicine, Mohammed Bin Rashid University of Medicine and Health Sciences, Dubai, United Arab Emirates. 2. Department of Physiology, Baker Heart and Diabetes Institute, University of Melbourne, Melbourne, Vic., Australia. 3. Department of Biostatistics, Mohammed Bin Rashid University of Medicine and Health Sciences, Dubai, United Arab Emirates.
Abstract
BACKGROUND: Hall technique crowns (HTCs) alter the occlusion temporarily, potentially affecting jaw muscles, particularly the masseter - the primary jaw-closing muscle. AIM: To assess masseter muscle activity (MMA) in children treated with a unilateral HTC. DESIGN: In 12 children treated with a single HTC, bilateral MMA was recorded with surface electromyography (sEMG) for ten cycles of Rest Position (RP) and Maximum Voluntary Clenching (MVC) over 20 seconds immediately pre-HTC cementation (Pbase ), immediately post-HTC cementation (Pimmed ), at 2 weeks post-HTC cementation (P2w ) and at 6 weeks post-HTC cementation (P6w ). t test, ANOVA and post hoc statistics were used (P < .05). RESULTS: As expected, MMA was low at rest and increased during maximal jaw clenching (P < .0001). MMA (mean ± SD) increased significantly (P < .001) between RP and MVC at: Pbase [from 1.60 μV·s (±0.96) to 5.40(±2.30)]; Pimmed [1.57(±1.15) to 3.75(±1.87)]; P2w [1.39(±0.54) to 5.54(±1.45)] and finally P6w [1.46(±0.56) to 6.45(±2.56)]. Rest MMA at Pbase , Pimmed , P2w and P6w remained unchanged (P = .18) whereas Pbase clench MMA reduced by a third at Pimmed (P < .001), returned to and exceeded baseline levels at P2w (P = .822) and P6w (P < .001), respectively. CONCLUSIONS: This pilot study showed that Hall technique crowns may affect masseter muscle activity in children. Clench MMA was reduced immediately post-treatment but returned to and later exceeded baseline levels at 2 and 6 weeks, respectively. Rest MMA remained unchanged.
BACKGROUND: Hall technique crowns (HTCs) alter the occlusion temporarily, potentially affecting jaw muscles, particularly the masseter - the primary jaw-closing muscle. AIM: To assess masseter muscle activity (MMA) in children treated with a unilateral HTC. DESIGN: In 12 children treated with a single HTC, bilateral MMA was recorded with surface electromyography (sEMG) for ten cycles of Rest Position (RP) and Maximum Voluntary Clenching (MVC) over 20 seconds immediately pre-HTC cementation (Pbase ), immediately post-HTC cementation (Pimmed ), at 2 weeks post-HTC cementation (P2w ) and at 6 weeks post-HTC cementation (P6w ). t test, ANOVA and post hoc statistics were used (P < .05). RESULTS: As expected, MMA was low at rest and increased during maximal jaw clenching (P < .0001). MMA (mean ± SD) increased significantly (P < .001) between RP and MVC at: Pbase [from 1.60 μV·s (±0.96) to 5.40(±2.30)]; Pimmed [1.57(±1.15) to 3.75(±1.87)]; P2w [1.39(±0.54) to 5.54(±1.45)] and finally P6w [1.46(±0.56) to 6.45(±2.56)]. Rest MMA at Pbase , Pimmed , P2w and P6w remained unchanged (P = .18) whereas Pbase clench MMA reduced by a third at Pimmed (P < .001), returned to and exceeded baseline levels at P2w (P = .822) and P6w (P < .001), respectively. CONCLUSIONS: This pilot study showed that Hall technique crowns may affect masseter muscle activity in children. Clench MMA was reduced immediately post-treatment but returned to and later exceeded baseline levels at 2 and 6 weeks, respectively. Rest MMA remained unchanged.