Tsuneo Tabata

A histologic comparison of the functional loading capacity of an occluded dense apatite implant and the natural dentition

A histologic comparison of the functional loading capacity of an occluded dense apatite implant and the natural dentition at a ratio of one implant to three natural teeth was carried out on six monkeys. Single implants were placed in the maxillary left second molar and mandibular right second molar of each monkey. Four months later, the vertical dimension of occlusion was raised at the contacting areas between the implant and the connected first, second, and third opposing molar teeth by placing metal crowns on them. The three connected molars gradually intruded over time, whereas the supporting bone of the mandibular and maxillary implants showed no abnormalities and was able to bear the load because of thickening and remodeling of the surrounding bone.

Delay method of implantation enhances implant-bone binding: a comparison with the conventional method

This report compares the conventional and delay methods of implantation, evaluating the bone formation around a dense apatite implant. In the conventional method, the implant is placed immediately after the cavity is prepared. In the delay technique, the implant is placed 2 weeks after preparation. This study found that many new thin trabeculae and capillaries formed around the cavity during the delay period, while none had formed at the time of implantation using the conventional method. The delay method showed earlier and wider bone formation, and less surrounding fibrous encapsulation. These results indicate that the delay technique can be an efficient method for establishing good bone binding.

Prosthetic Treatment for Psychiatric Patients.

The purpose of this study was to survey the oral conditions of the inpatients treated in a psychiatric hospital.One hundred and twenty-one inpatients of Haryuugaoka Hospital who received dental care at the dental clinic of the hospital participated in this research.Their teeth, occlusal and functional conditions were recorded and the prosthodontic treatments were analyzed.The DMFT-index of the patients was 23.12 and national average was 14.55 in 1988 moreover, they have a greater tendency for missing teeth than the national average.So 47.9% of the patients lost their occlusal contacts in both premolar and molar areas.Functional disorders were found in 14.9% of the patients.However, the average of the range of motion of the patients was 41.0mm, that is, it was slightly smaller than the value of the normal subjects.Tardive dyskinesia also existed in 7.7% of the schizophrenic patients.Removable dentures tended to be used more often than fixed prostheses.The prognosis of the dentures were fair.Nearly 3/4 (72.5%) of the dentures were in use at 9 months after insertion.In the dental treatment for psychiatric patients, some problems such as the difficulty of communication remain unsolved.Cooperation with psychiatrists, clinical psychologists and nurses may be desirable to solve the problems.