[in Japanese]

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The guided inclinations and the locations on the functional occlusal surface of the natural dentitions, regarding angle class I molar relationship, were studied on 20 mounted casts on the SAM2 articulator that were adjusted by condylar path. Twenty subjects also underwent computerized axiography to obtain the condylar path (Sagittal condylar inclination and Bennett angle) . The lower each tooth of all lower casts were provided with pin to remove the die from the cast. The die that was guided firstly was marked and removed from the cast. This procedure was repeated until last guided die was marked.All measurements of the guidable inclinations were made using a 3D-digitizer (MicroScribe-3D) and were referenced to the axis-orbital plane. The guided locations on the teeth were marked on the occlusal map. The values of the guided inclination from canine to 2nd molar ranged from 42.8 to 18.7 degrees on the left side and from 40.0 to 20.1 degrees on the right side, indicated a sequential guidanced occlusion with canine dominance.
There is a significance in the value of guided inclination between neighboring teeth, except for the value between 2nd premolar and 1st molar. High frequency of the guided location on the functional surface observed medial lingual or buccal part, except for 1st molar. This result was caused by the crown angulation of medial lotation of the distal cusp in the upper first molar. This study indicated the principle of occlusion that is provided with natural dentitions, regarding class I molar relationship.

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Marginal tissue recession related to periodontal disease or tooth mal-position, such as facially prominent tooth can cause to root sensitivity, root caries, and esthetically unacceptable root exposures. Accordingly, marginal tissue recessions were treated by root coverage procedures in order to improve these problems, and predictable clinical results have been reported significantly. However, it had been considered that the root coverage for facially prominent tooth was difficult to obtain the adequate clinical results because of as disadvantage.
The purpose of this study was to demonstrate the efficacy of root coverage technique utilizing the combination of GTR and subepithelial connective tissue graft in the treatment of marginal tissue recession of facially prominent exposed root. Bilateral maxillary canines that prominent facially with deep and wide marginal tissue recession were utilized in this study. This procedure was started on the reflected full thickness flap, then e-PTFE membrane was placed over the exposed root surface. The flap was extentional replaced to coronally in the situation of cover the membrane. Six weeks after the surgery, the flap was reopened for the purpose of remove the e-PTFE membrane. This procedure then continue the subepithelial connective tissue from the donor site at palate was grafted onto the newly formed tissue covering the exposed root. The periodontal parameters of the results were measured 12 months later. In the results, the probing attachment gain of 5.5mm in the right, and 4.5mm in the left side were measured. The keratinized tissue was obtained increasing of 4.5mm in the right, and also increasing of 3.0mm in the left side. And the exposed root surfaces were completely covered with sufficient keratinized tissue. This results suggested that it is significant predictable procedure for the case of marginal tissue recession with facially prominent exposed tooth.

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Porcelain stains are routinely utilizes to modify the color or characterize the surface of porcelain restorations. Light cured porcelain stain is useful to transfer the color information between chairside and ceramist.
This study evaluated the color stability of two stains of a light cured porcelain stain system between light cured and grazing stage. Fourteen porcelain disks (Empress) were coated with stains (Topaz Orange and Chacole Brown) light cured and the fired. Colorimetric readings were made befor and after light cured and also after firing, then the color different (ΔE) was calculated.
The results demonstrated the color match between light cured and fired stages ranged from apprecible different in the N.B.S. evaluation.

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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