Verification of mandibular movements in the state of wearing an oral appliance for obstructive sleep apnea syndrome

Yamada Kyoko, Yamaguchi Taihiko, Mizuno  Mariko, Saito Miku, Maeda Masana, Mikami Saki

doi:10.34420/jjaoh.29.1_15

<p>Bi-block type oral appliances （OAs） for obstructive sleep apnea syndrome （OSAS） allow mouth opening and reduce the disadvantage of mono-block OAs due to restriction of mandibular movement. However, mouth opening might be disadvantageous for preventing sleep apnea depending on the direction and/or range of opening movement. The aim of this study was to verify characteristics of the directions and distances of the paths of mandibular movements when wearing a bi-block type OA. The subjects were 12 healthy persons who voluntarily participated in the present study. Using a computerized jaw movement analyzer, habitual mouth opening and closing movements and sagittal mandibular border movements without an OA and opening movements, anterior movements, and sagittal mandibular border movements with the two types of OA （NK connector II, Silensor SL） were recorded and analyzed. It was revealed that mouth opening movement both in the state of wearing the bi-block OAs made mandibular paths in the forward area of the habitual opening paths. It was also revealed that the opening movement with the OA showed a path perpendicular to the occlusal plane or toward the front and not significantly toward the back. Further, it was found that though mouth opening was permitted when wearing the bi-block OA, the allowable amount of mouth opening was relatively small. These characteristics of the mandibular movement paths indicated that the structures of the bi-block OAs used in this study were reasonable as OA for OSAS.</p>

Verification of mandibular movements in the state of wearing an oral appliance for obstructive sleep apnea syndrome

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