an oral appliance for the medical treatment of specific sleep related disorders , i . e ., snoring and obstructive sleep apnoea , which has a number of sections for each jaw component which can be separated for ease of insertion and removal by patients . the separable components can be moved along an inherent guidance system and safely secured in the closed position by a bilateral locking mechanism . by virtue of the difference in paths of location of the main and the separate sections of each component , effective resistance to dislodgement of the appliance is obtained and maintained . this constitutes the claimed significant improvement in appliance retention .