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Patient: Adhesion pontic bridges, consisting of composite denture teeth and adhesion metal splint, were installed for missing lateral incisors for a patient with severe periodontitis., Discussion: Peeling off or falling off of the adhered pontics and metal splint was not observed during 7 years after placement. This prosthetic treatment method may be advantageous to both dentist and patient, as it enables immediate esthetic recovery. Making an impression for fabrication of the metal splint was carried out after controlling the mobility of each abutment tooth by adhering pontics, which might have led to the excellent adaptation of the metal splint to abutment teeth and pontics. Furthermore, appropriate surface treatment for each bonding interface might have resulted in the durable bonding of pontics and metal splint to abutment teeth., Conclusion: The current method provided satisfactory long-term results after placement equivalent to conventional fixed partial denture and adhesion bridge.

Patient: The patient was 60-year-old male whose chief complaint was esthetic problem due to median diastema. After orthodontic treatment, an adhesion-fixed metal splint was placed to retain 3-3. After 11 months, the metal retainer on 3 partially debonded. The retainer on 3 was removed and 3 was connected to 4 with an adhesion-mechanically fixed metal splint. Six months later, 3 was separated from 2+2 and connected to 4 5 with the conventional crown restoration., Discussion: The prognosis is good. This result is attributed to the decrease of splint length and the application of the adhesion-mechanical retainer. These seemed to increase the rigidity and prevent deformation of the splint, thus reducing tensile or shear stress applied to the adhesion interface and improving the bonding durability., Conclusion: This clinical case suggested that the range of splinting and design of retainer affect the durability of adhesion-fixed metal splints.

The short-term effects of the difference of occlusal splint contacts on the jaw function were investigated on five healthy subjects. The maxillary stabilization splint (S-type) was fabricated and sectioned into three parts: an anterior section (A-type) and two posterior sections (P-type). These 3 types of splints were used for 10 days for each subject. The EMG activity of the masseter and the anterior and the posterior temporal muscles were measured during the maximum clenching in the intercuspal position and on the wearing splint. Subsequently on the bite force-measuring device with two transducers the bite and the EMG activity were measured during the maximum clenching, and the intercuspal occlusal contacts were recorded. The results were as follows: 1. After wearing the P-type, the total EMG activity during clenching in the intercuspal position was decreased, then increased after removal. 2. After wearing the S-type and the A-type the anteroposterior distribution of the bite force during clenching was changed, then returned after removal. 3. After wearing the A-type, the occlusal contact area of the anterior teeth in the intercuspal position was decreased, then increased after removal, while after wearing the S-type and the P-type that of the posterior teeth was decreased, then increased after removal.

Clinico-histological studies were made to obtain basic data on the application of 2 piece-type hydroxyapatite (hereinafter referred to as HAP) originally designed and prepared so as to be shaped to make its clinical application easy as an anchor (HAP anchor) in the corrective movement of teeth. An immobility identification experiment and intrusive experiment were performed in order to identify absent loss of anchor to the corrective force and to identify actually practicable tooth movement by means of the HAP anchor, respectively, and clinico-histological evaluation was made of its function in both of the above cases. The results revealed no change in the distance of HAP anchor in the former experiment and tooth intrusion of 3.7 mm on average in the latter experiment and, histologically, close surrounding of almost the entire region embedded by the HAP anchor, with newly formed osseous tissues in both experiments. The above results suggest the usefulness of this trial HAP anchor as an anchor to tooth movement in periodontal therapy.

Composite resin materials are now widely used for dental therapy. The purpose of this study was to clarify the effect of composite resins on gingiva and pulp in case of application of them for temporally splint in periodontal treatment. 60 teeth in 6 female dogs ranging between 1 and 2 years of age with healty teeth and gingiva were divieded to 4 groups; (1) 12 teeth, controls; (2) 12 teeth, self-cured composite resin (Clearfil F II, CF II); (3) 18 teeth, light-cured resin (Belfel LX, BLX), curing time 20 sec. and (4) 18 teeth, BLX, 40 sec., and then 48 class V composite resins were restored supragingivally. The experimental procedure were carried out for 5 days and 30 days. Histopathological observations of 60 teeth inclusive of controls were made by applying to specimens with Hematoxylin eosin staining. For the materials and time periods in this study it was found that; 1. Light-cured composite resin was superior to self-cured composite resin on handlings. 2. There were no significant differences in periodontium between the experimentals (BLX, CF II) and controls in 5 days. At the 30 days the histologic score showed more gingivitis for the experimental teeth than for the controls (BLX-40 greater than BLX-20 greater than CF II greater than Cont.). 3. At 5 days hyperemia occurred in some cases of experimentals (both BLX and CF II). The appearance of predentin and changes of odontblastic layer were observed slightly in 30 days. But there were no significant differences between BLX and CF II. 4. The result suggested that applying to composite resin materials for temporally splint, both gingiva and pulp have to be protected.

It is mandatory that the prosthodontic devices for the cleft palate patients not only prevent the relapse of the corrected arch and teeth by orthodontic and/or surgical intervention but also equilibrate the tooth-borne ability between the upper and the lower jaw. The purpose of this paper is to set up a criterion for the extension of the splint from the point of the tooth-borne ability. Four patients with unilateral cleft lip and palate were examined for the maximal biting force at the tooth adjacent to the cleft in each alveolar segment in the case of various extensions of the splints. The findings were as follows: 1. The maximal biting force increased significantly in every splint, compared with the non-splint. 2. The maximal biting force increased significantly in the splints where the neighbouring tooth in the same segment was involved, compared with that in the splints where only the tooth adjacent to the cleft was involved, even if the tooth in another segment increased in number for splinting. 3. The maximal biting force did not increase significantly in most splints where three teeth in the same segment were involved, compared with that in the splints where two teeth in that segment were involved.