In daily practice, it is often difficult to diagnose cases in which bite raising is indicated. Changes that have been created over the years can not be easily modified. In this study, we observed a case in which rather unreasonable bite raising had been performed ten years previously. This case was treated with bite raising as part of prosthetic treatment, resulting in a loss of anterior guidance. The patient showed significant modification of occlusion to compensate for the loss of anterior guidance, leading to the recovery of the original occlusion. Mechanisms of this modification process were studied by following the recovery course.We concluded that the patient successfully adapted to the changes in occlusion by greatly modifying his body. We not only were impressed by the adaptability of the living body, but also considered whether prostheses can be created that can harmonize human bodies.

Since prosthetic replacement of missing teeth using implants has become fairly reliable, implantsare now used in a great number of cases. Recently, immediate implant placement has been performed with increasing frequency as a result of considering the healing period and preservation of the bone around the wound socket after tooth extraction, and this has been described in a number of reports. There are also various kinds of implants. Cases in which I. T. I. implants were inserted are reported and discussed.

Expressing the individual's gender, characteristics and age is important in achieving successful dynesthetic of the mouth. Particularly, the size, color, morphology and position of the anterior teeth possessing natural harmony play important roles. The following factors are involved in establishing the esthetics of the mouth : 1) the incisal embrasures created by the occlusal plane with bilateral symmetry and the teeth with vertically harmonious axes 2) harmonious lip and buccal support produced by the teeth placed with bilateral symmetry in a buccolingual or labiolingual direction 3) harmonious vertical dimensions. Thus, a beautiful smile line is established by harmonious lip and buccal support.When examination and diagnosis of esthetic occlusion or fabrication of prostheses are performed on an articulator using an indirect method, spatial localization of the mandible and mandibular movement should also be reproduced on the articulator. To determine reference points that are common in a living body and an articulator, a face-bow transfer is generally adopted. According to the face-bow transfer, the transverse horizontal axis points are used as the posterior reference points, and the infraorbital margins are used as the anterior reference points.However, the median vertical line that is expected to reproduce the median plane of the living body are often lost during transfer, also losing the horizontal coordinates that intersect perpendicularly to the median vertical line.As is generally known, there are no esthetic indicators on the outside of the mouth reproduced on an articulator. This is clearly disadvantageous when fabricating prostheses as well as examining the following factors: the axes of the anterior teeth, bilateral symmetry of the occlusal plane, and symmetrical sagittal inclination of the occlusal plane, all of which are involved in producing a harmonious smile line most contributes to the esthetics, and bilateral symmetry of the dental arches producing harmonious lip support.Recently, an esthetic face-bow has been developed to overcome this problem. This esthetic facebow uses the median plane as common coordinates of the living body and articulator. Excellent clinical as well as laboratory results have been obtained using this esthetic face-bow in diagnosing and constructing dental arches.

Long term clinical results with distal extension saddle cone-crown-retained-dentures (CCRD's) were discussed. Distal extension type of tooth loss may contribute to one of the etiologic factors of TMD's. The concept of shortened dental arch (SDA) advocated by Käyser et al was seem to be still controversial from the researches by the present author. Some of the clinical implications are stressed in this article when one treats the distal extension case using the cone-crown-telescope as direct retainers giving the design of RPD as the rigid supported concept. In conclusion, CCRD's are one of the standard methods in treating the distal extension cases with good and long term clinical results over 20 years.

Prosthetics is required to accomplish restoration of the function of the teeth or the dentition. Prostheses placed in the oral cavity are required to be compatible to the living body and to perform their function over a long period. Occlusion is undoubtedly a key to successful prosthetics.We, therefore, evaluated how dentists and dental technicians should cooperate to implement better occlusion.In this study, to re-establish this point, we selected a few basic problems and evaluated each of them from the viewpoints of dentists and dental technicians.

Swallowing is the most important movement in the oral cavity as an inret of nutrition essential to the maintenance of the human life. At that time, patients wearing full dentures due to edentulous jaw have comparable movements to those observed in the dentulous jaw. Namely, the tongue press its tip against the rugae of palate in the first stage of swallowing, and then gradually establishes contact between its back and the posterior portion of palate with pressure to transport the food into the pharynx. During this couse, the contact of the posterior portion of tongue with dentures plays an important role in stabilization of dentures.Strack has proposed that arrangement of artificial teeth in the same place as that of the natural dentition is the best way to maintain the stability of denture.In recent years, techniques of making dentures have been improved with the advancement of dental materials. I devised a method of simultaneously making impressions of upper and lower jaws using a injection device and a silicon impression material. I have routinely used this new system to make full dentures for clinical cases.On this occasion, registration of interocclusal relation, gothic arch tracing, simultaneoustaking of upper and lower impressions, and face bow transfer will be performed in front of you using patients, from the initial examination to the setting of full dentures.

Watanabe and others reported the efficacy of the application of the Electromyogram biofeedback method for occlusal diagnosis and treatment in patients with arthrosis of the TMJ. They also found the mandibular position induced by this method quite stable physiologically, and they named this position PCP or Physiological Centric Position.We report a case of infraocclusion and problems in horizontal mandibular relationship in which a simple method of EMG biofeedback was used, depending only on the fingertip palpation to improve mandibular relationship as part of oral rehabilitation.