An accurate framework is getting improved owing to CAD/CAM systems. But, to make an accurate framework needs an accurate model, especially in the CAD/CAM systems. Therefore, we considered a positioning procedure to acquire an accurate models. When we make a framework in conventional method, sometimes a framework is not fi t to the fi xture, because of some reasons, such as an error during step of making a model and from characteristic of material. In case of those, if the frame was made by casting or titanium frame, we would be able to cut the frame and repair with soldering or laser soldering. And we could correct a frame. But if a framework was made from zirconium framework, there was no longer repair way, so we must go back to the first step. Therefore, the accurate model is required. A study of the report indicates how to delete an error. Primary, in step 1 method, the hole, which was opened to the individual impression tray, must be a minimum size and fi t to the mucosa, because if a tray was made far from mucosa, it means that the hole is bigger than previous tray. And when impression material was harden, impression coping should be attached using minimum resin to the hole, because this can help resistant from weight of plaster. And this can avoid a change of model. Secondary, in step 3 and 4 methods, owing to additional step of positioning, we can get two merits. One is that we can make sure conventional method fi tting by checking screw is smoothly going or not. And the another is that we can compensate incompatibility in this step because of cutting the resin frame. It is like a very similar to the fi nal step, because if fi nal framework was maddened from bad model of cause, we must do the same step like a positioning step. Tertiary, in step 7, because of using straw, it can avoid an error from an expansion action of a plaster and changing from weight of a plaster. Finally, because of positioning step, we can get more accurate model than conventional model.

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Recently, dental technique has been dramatically advanced. Especially, the continuing development of regenerative procedures makes previously untreatable cases treatable. New technique always attracts us. However, our dentists' first priority is to establish functionally and esthetically excellent masticatory system in order to improve the general condition. In addition, the optimal application of new technique in this situation may be important. I report here a case of an implant patient with temporomandibular disorder who was treated using an articulator whose median sagittal plane was coincided with median sagittal plane of the patient in order to reproduce the normal value of the cusp angle and reconstruct the occlusion.

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Abstract:The purpose of this study was to clarify relation between the morphology of the gothic arch (following GoA) and the tapping point (following TP) provided by GoA tracing method with tapping (following Ta) method which are using for decision of the horizontal mandibular position of the edentulous patient. Method: 161 records which were gotten by the GoA tracing method with Ta method during 11years were examined. The evaluations were quantitative and morphological using GoA score which was contrived newly. These were divided into 4 groups in the distance among the apex (following Ap) /TP and were statistically analyzed. As results: ①A group (0-0.9mm)was 40.4% (65 patients), B group(1.0-1.9mm)was 29.8% (48 patients), C group(2.0-mm) was 22.4% (36 patients), D group(TP only) 7.4% (12 patients). The Ap confirmed in TP(in the A group) was 13.0% (21 patients). ②③There were not either of statistical differences in the front momentum and in the lateral momentum. ④Among each of the groups, there was no statistical difference in the spread angle from Ap. The average was 113.54±7.91°. ⑤The spread angle from TP were 119.51±9.07° in the A group, 121.83±9.16° in the B group, 138.42± 21.06° in the C group. There was a statistically difference in the C group to the A group and the B group (p<0.05). ⑥The GoA score was 4.2±2.37 in the A group, 6.01±2.50 in the B group, 7.52±1.93 in the C group. A statistical difference was admitted among each of the groups. (among A-B･B-C: p<0.05, among A-C: p<0.01 ). ⑦About the number of the denture adjustments, total average was 2.38±1.64 times, 2.28±1.64 times in the A group, 2.92±1.78 times in the B group, 1.83±1.12 times in the C group, 1.41±0.76 times in the D group. There was a statistically difference in the B group to the C group and the D group (p<0.05). From these result: When the distance among Ap/TP increase, there was no change in the functional limit of the mandibular movement from Ap. On the other hand, the movement from TP was using the area of intermediate movement, therefore, the statistical variance was increasing. Also it found that the GoA score increased, when the distance among Ap/TP increase, it was proved the dysfunction of the mandibular movement. About the number of the denture adjustments, there was statistical different on the B group, but clinically, there were only a few difference with the other group. At the end, GoA tracing method with Ta method can diagnose whether or not that the TP is appropriate to the mandibular position for the denture.

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It is generally agreed that successful endodontic treatments rely to a great extent on three dimensionally hermetic obturation of the root canal system. About three decades ago, the thermoplastic root canal fi lling (TP-RCF) technique was introduced to fi ll a roof canal effectively. In my clinic, TP-RCF has been performed for many years. In this study, the ability of TP-RCF to fi ll simulated roof canal models and extracted human teeth was compared with that of lateral condensation root canal fi lling (LC-RCF). Furthermore, long-term prognosis of the infected root canals with apical lesions was evaluated for both fi lling techniques radiological. As a result, the apical lesions when TP RCF was used tended to disappear more surely.

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Reacently,the dental implant treatment is able to expect a high prospect. This is more dominant in function and aesthetic than artificial teeth. However, the longer treatment period is often pointed out as a problem. n the anterior region of alveolar arch, the labial cortical plate is thinner than its lingual counterpart. herefore, that is first to remodel or resorb after tooth extraction, disease or trauma, and its extent is greater than the lingual cortical bone. In the posterior regions, that is also similar. e, Japanese as a Mongoloid only have the much thinner labial plate than others like Caucasian. Because of that,the reconstruction of the missing tooth might be difficult thing for us. To solve these problems, the implant placed immediately after extraction is often applied. It is suggested that this method is useful for shortening at the treatment period and reducing alveolar resorption. his time, we show two case reports and clinical statistics of immediate loading of dental implants. All the operations were performed in our clinic from April 2004 to December 2007. Twenty-two patients five males and seventeen females were operated on, and twenty-nine implants were placed. As a result, its survival rate is 96.6%. The results of this limited investigation suggest that the dental implant immediately placed and loaded after extraction is one of the useful treatment methods of prosthetic procedure under the appropriate examination, diagnosis and maintenance.

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Although the relations between periodontal issues and other physical disease have been reported, significant relations among periodontal disease, malocclusion and orthodontic treatment have not been reported. However, orthodontic treatment creates pockets, causing gingival recession as well as bone loss. Especially, in adult orthodontic treatment we must consider the periodontal tissue. It has been considered that occlusal problem would not cause periodontal disease, but mesial inclined teeth tends to cause plaques to the mesial site, forming pockets, eventually leading the bone loss. We concluded that what we conduct orthodontic treatment, we must be careful of the periodontal tissues, in order to avoid the bone loss, attachment loss, or formation of periodontal pocket.

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A goal of any orthodontic treatment is to achieve desired tooth movement with a minimum number of undesirable side effects. In recent clinical orthodontic dentistry which the smallest cooperation of the patient and maximal serious consideration of esthetics outcome are demanded, therefore we should replace temporary anchorage device to conventional extraoral anchorage appliances. Clinical application is widely done as anchorage and vertical movement and horizontal movement using temporary anchorage device, Temporary anchorage device has been established as a foresight that is not controlled by patient cooperation-related high therapy. The effectiveness of orthodontic mini-implants dose not diminish concerns about loss of anchorage, it solve the problem of loss of anchorage. However it remain that many unresolved problem of diagnosis and treatment procedure using orthodontic mini-implants. By this presentation, I tried to add consideration about a treatment procedure and treatment outcome and diagnostic method, biomechanics including setting of esthetic goal in class Ⅲ malocclusion.

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Clear Aligner treatment system is very useful in the case where orthodontic treatment with conservative multi bracket system can not be acceptable because Clear Aligner's system is simple and esthetic. e recommend teeth whitening to the patients who have Clear Aligner treatment, because it is convenient to use Clear Aligner as whitening tray while the patients are wearing it for over 17 hours a day. Usually, it is necessary to use as whitening tray for two hours a day continuously and whitening period is two weeks. This system has three merits as follows. First, the whitening can be carried out with the orthodontic treatment simultaneously. Second, the cost performance is useful for the patients because it is not necessary to make the charged whitening tray. Third, the home whitening can decrease the frequency of visiting the dental office as compared with office whitening. The patient's satisfaction progressed so much with above three merits. I will report some cases that were treated by this system with the questionnaire concerning this treatment system we made.

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The current implant treatment indicate the concept of Graftless Surgery as a minimum invasive treatment. Immediate function which placed the day of surgery encounter difficulties with insertion to ideal position. The lack of parallel direction to several fi xtures infl uence on prosthetic design. The purpose of this study is to evaluate a newly developed magnetic attachment AttractP^® as a casting material.

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[in Japanese]

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