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.

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It has been recognized that MRI is very useful for description of clinical pathology in the temporomandibular joints. But detailed reports on MRI findings after splint treatment for temporomandibular disorders were rare. We evaluated MRI findings in TMD patients (disk disorders with reduction), after splint treatment.
The patient was a 18-years old male, who complained of jaw opening disorders and bilateral temporomandibular joint pain. For imaging of the temporomandibular disorders, Toshiba MRT-50A was applied. MR imaging was performed before and after splint treatment. And stabilization splint was applied.
In this patient, the disk were not captured by the splint treatment.

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It was demonstrated elsewhere that in reaction to the occlusal force transmitted to implants inserted in the jaw bone, various phenomena occur in the bone around the implants such as bone resorption and new bone formation. These reactions are of clinical importance as they greatly affect the functions of the stomatognathic system after implantation.
We personally observed new bone formation in the bone around the fixture after implantation. However, the condition and time of new bone formation surrounding a functional implant is poorly understood. To examine these, cases in which implant prostheses had been fabricated are analyzed.

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It is important that the dental stone model be disinfected in the dental office. Because dental treatment is bloodly treatment and contaminate impression with saliva-blood and transmitted to dental stone model. Contaminated dental stone model occur cross contamination to dental technician.
Therefore dental technician in the dental office must disinfect the impression adding sodium hypochlorite to water for the dental stone. Still spray with ethanol to dental stone model.
In case of dental technician in the dental laboratory, at first gather dental stone model disinfect with ethanol and then sterilize 100°C dryclave for 1 hour or disinfectant (povidon iodine for 5 minutes and irugasan DP300 for 10 minutes) .

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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.

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When replacing anterior teeth with a bridge, attention should be paid not only to masticatory efficiency and speech but also to esthetics, which is sometimes even more important than the other factors. Since resorption of the alveolar ridges occurs following the loss of roots, the loss can not be properly replaced by a pontic having the form of the anatomical crown. Furthermore, as the number of missing teeth increases, resorption of the alveolar ridges becomes further advanced, making it more important to consider not only the relationship between the labial surfaces of the pontics and the alveolar ridges, but also restoring the esthetics of the lips and complexion by providing sufficient restoration of lip support.
The forms of pontics that meet these conditions are not necessarily hygienic, thus requiring additional attention to plaque control.
With these details in mind, pontics replacing a loss of three or four anterior teeth are discussed.

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When treating serious periodontal diseases, remedies that only treat inflammation caused by bacterial plaque often fail to achieve satisfactory results.
Therefore, it is necessary to properly determine etiologic factors before treatment. In 1952, Waehauge described conditions of inflammation generally observed in periodontal diseases as “there is inflammatory cell infiltration within the range of 1 mm to 2 mm from the border of plaque.” However, inflammation is often observed beyond 2 mm from the attachment of plaque. In such cases, brushing or initial treatment is often ineffective.
Cases of periodontal diseases in which circulation inhibitors were greatly involved are presented, and the periodontal treatment and occlusion provided by prostheses were discussed.

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