Numerous researches on development and evaluation for adhesion, metal, ceramics, composite materials, and denture materials have been carried out in recent dental materials researches. Of these researches, a remarkable progress has been in adhesive technologies related to dental ceramic materials. Dental ceramics, currently, classified in two categories: silicate ceramics and oxide ceramics. As compared with Zirconia ceramics (oxide ceramics) which exhibit notable mechanical and physical properties, lithium disilicate ceramics (silicate ceramics) show the clinically acceptable properties, dimensional accuracy and esthetical advantages in transparency and natural appearance.

This retrospective study was conducted to investigate excessive functional force resulting in mechanical stress and its effect on stomatognathic system. Of cases where signs of mechanical stress were observed, some presented oral exostosis while others did not. This suggests individual differences in biological response to such mechanical stress. The subjects of this study, 120 patients with suspected temporomandibular disorders, were investigated on clinical signs of and biological response to the mechanical stress. The result presented the difference in degrees of selfawareness to temporomandibular disorders. In addition, some of the patients with no symptoms of temporomandibular disorders presented exostosis or abnormality in teeth or periodontal tissues. As such, in some cases stomatognathic system was adapted to excessive mechanical stress, consuming the stress by breaking down the proximal tissues; while in other instances the organism physically reinforces itself in response to the stress. This difference need be taken into consideration in treatment planning when treating temporomandibular parafunctions and controlling tooth contacting habit. If this kind of investigation could be conducted at multiple clinics, mechanisms of different symptoms may be revealed and more effective treatment may be provided.

After restraint of periodontal inflammation by periodontal treatment ranging from the basic treatment to the periodontal surgery, recovery of chewing function by periodontal prosthesis is our treatment strategy for patient with severe periodontitis and masticatory disturbance caused by moving tooth. We selected internal crown and removable final restoration for the purpose of predicted retreatment considering the aged deterioration. In this case, within a limited treatment period, we performed full-mouth reconstruction focusing on suitable occlusal plane and occlusal form. As a result, the patient recovered chewing function and general health back.

Implant treatment has been increasingly selected as an option to replace missing teeth. There are, however, many cases where implant treatment is not applicable due to financial reasons and patientʼs wishes. On the one hand, the bridge, removable denture, tooth transplantation, and leaving-as-is would be considered as standard prosthetic options; other options than transplantation put the remaining teeth under strain, which may result in additional loss of teeth. On the other hand, depending on the condition of the donor tooth, autogenous tooth transplantation often facilitates prosthetic restoration without causing any damage to the adjacent teeth. This report is to present a case of hopeless mandibular right first molar with root fracture, treated by transplantation of maxillary right third molar. The x-ray images do not show ideal healing process, but the difficulty of the procedure and applicability criteria are discussed in return.

Peri-implant disease has been increasing along with the spread of implant treatment. In recent years, a lot of reports on peri-implant diseases have been made and a variety of references have become available, but these data are based on different countries and races, living environments and insurance systems, surgeons, methods of treatment, techniques, etc. The size of samples being analyzed is also different, so it is difficult to standardize and estimate the incidence of peri-implant diseases. The statistical outcome is a numerical information, and it is desirable to interpret, discuss, share, and reflect such information in the clinical setting. Therefore, in this study, we report the incidence rate of the peri-implant disease in implant treatment performed at our clinic in order to understand the condition in our clinic.