Meaning of mandibular prosthesis
General Principles of Maxillofacial Prosthetics: …
A wrong sleeping position (decubitus) hinders the Automatic Spontaneous Swallowing. The latter is an unconditional movement, whereby every 4 minutes any human being spontaneously swallows. If this functional action is performed while the jaw is free to move and in a correct position, it exerts compression and decompression on the teeth. This simple movement favours blood circulation in teeth, periodontium, gums, periodontal ligament and cement, alveolar bone, temporo-mandibular joints, chewing muscles. Instead if it is performed in a wrong position (see above), the Spontaneous Deglutition does no long exert its beneficial function but causes stress on the chewing muscles, teeth chafing, (BRUXISM), thereby damaging the overall structure of the teeth, gum, periodontium, masticatory bones, and TMJ. In a wrong sleeping position the weight of the head pushes the mandibula to lateral occlusion and exerts non-stop compression ( for many hours)on the teeth, gums, periodontium and TMJ, therefore obstructing the blood circulation and moving the teeth in bad occlusion position. In order to swallow, masticatory muscles must activate themselves to center the jaw and then must bring the teeth from forced lateral misocclusion to centered occlusion (maximum Intercuspidation occlusion), gnashing the teeth, Obviously, everybody who has lost many teeth needs special therapies in association with a correct sleeping position. Nevertheless, there is little hope to achieve total recovery without eliminating the wrong position (mandibular decubitus), which is the most important cause of the above-mentioned problems. Everybody who undergoes treatment of Tmj syndrome, pyorrhoea, paradentosis, needs correct sleeping positions in order to avoid the certainty of relapse.
US5489305A - Mandibular prostheses - Google Patents
In three patients, three implants (3%) failed. The implants were lost in the first, fifth, and sixth years after prosthetic delivery. Two implants had been placed in the posterior and one in the anterior region. The implant that failed in the first year following prosthetic restoration (mandibular right first molar region) supported an implant-supported telescopic prosthesis without any mucosal contact. After prosthetic delivery, recurrent plaque-induced periimplant inflammation that lead to implant failure occurred. The implant that failed in the fifth year after prosthetic delivery (mandibular left second molar region) was also part of an exclusively implant-supported telescopic prosthesis with no mucosal contact. It failed as a result of biomechanical overloading--without any signs of periimplant bacterial infections--because of difficult interocclusal relations and missed recalls. The implant lost in the sixth year after prosthetic restoration (mandibular right canine region) was part of an implant tissue–supported prosthesis. Occlusal overloading--without any signs of periimplant bacterial infections--was the reason for implant failure. The cumulative implant survival rate was 97% at the 9-year interval (Fig 6).