Health Sciences University of Hokkaido Academic Repository / 北海道医療大学学術リポジトリ
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<REVIEW>Preprosthetic Surgery for Atrophic Alveolar Ridge
Get PDFP(論文)Occasionally the patient has such a degree of resorption of the alveolar ridge that an acceptable retention of the denture cannot be obtained by means of conventional prosthetic methods. In such cases a wide spectrum of prosthetic and surgical techniques has been applied. Especially in the edentulous patient with a severely atrophic alveolar ridge, surgical intervention may be necessarily indicated. Mainly these preprosthetic surgical procedures contain soft tissue manipulation, reconstraction of lost alveolar bone with transplantaion of bone or alloplastic material and submucosal implants. In this article, the author has briefly reviewed the operative procedure and the advantages or disadvantages of the main preprosthetic surgical procedures.In addition the author has presented a surgical procedure and the excellent postoperative results of the total lowering of the floor of the mouth and vestibuloplasty with split-thickness skin grafting that he and co-workers have performed.departmental bulletin pape
<ORIGINAL ARTICLE>Changes of Sucrose and Glucose Contents in Adherent Plaque of Plaque-Susceptible Rat
Get PDFP(論文)This study was performed to measure sucrose and glucose contents in the adherent plaque of Plaque-Susceptible Rats(SUS). The rats were bred at Higashi Nippon Gakuen Univ. and at 5 weeks of age, fed a commercial powder diet. Plaque was after 1,3,6,9 and 12 months on the diet and collected a further 1,2,3 and 7 days after removal. Sucrose and glucose contents measured by F-Kit from Boehringer Mannheim Yamanouchi Co. Ltd. Sucrose and glucose contents of adherent plaque were higher at 3 and 6 months than other times, moreover sucrose was high 3 days after removal except at 9 and 12 months and glucose was high 1 day after removal except 1 and 12 months. It was also found that the moisture content of adherent plaque was more than 50% of the wet weight at 6 months or later. The results suggest (I) the sucrose and glucose in the diet including in the adherent plaque and an irritant to the gingiva, therefore (II) the removal of plaque was one of the most important preventive factor for gingivitis and periodontal disease.departmental bulletin pape
<ORIGINAL ARTICLE>A Comparative Study on the Effect of Appliances Used to Correct Reversed Occlusion Cases
Get PDFP(論文)Cephalograms of reversed occlusion cases at pretreatment and after correction were analyzed to compare and to discuss the effect of each appliances. These cases were divided into 3 groups of 20 cases each according to the appliances used. The following results were obtained. 1. In the maxillary protracting group, maxillary dental arch and maxillary bone revealed the forward positioning with counterclockwise rotation and mandible revealed the retraction with clockwise rotation. 2. In the chin cap group, the labial movement of maxillary incisors and lingual movement of mandibular incisors and clockwise rotation of the mandible were shown. 3. In the light wire group, labial inclination of maxillary and mandibular incisors and clockwise rotation of mandible were shown. 4. The effect of the maxillary protracting appliance was considered to be the forward movement of the maxillary complex with a counterclockwise rotation. 5. The effect of chin cap was considered to be a retraction of the mandible and the enhan-cement of the clockwise rotation of the mandible.departmental bulletin pape
<ORIGINAL ARTICLES>A Study of Retainer in Overdenture l. 0'ring Attachment
Get PDFP(論文)Recently, the use of the O'ring attachments in the overdenture has been reported. Generally, the female part with the O'ring is a resin cap which becomes incorporated in the denture base with self-curing acrylic resin. Synthetic rubber provides the O'ring attachment with physiological relief in occlusion, but its elastic strength may produce stress to the abutment tooth out of function. Furthermore, there are a few problems in the use of the O'ring attachment; the discoloring and the flaking of the self curing acrylic resin, the gingival inflamation around the abutment tooth, and the hight the base of the male part to maintain the thickness of the female resin cap. To resolve these problems, we designed a metal outer-cap, in which the O'ring is enclosed, and applied this to the few remainingn teeth in the overdenture. The outer-cap should extend over the gingival border of the male part. Its thickness is about 0.3 -0.4mm. Retention beads is added to the outer-cap to retain the denture base material. The amount of relief is decided by the thickness of the coating agent or seat wax on the working cast. Completed casting is highly polished on both sides of the surfase to minimize metal display through the acrylic resin and to keep the inner surface clean. Otherwise, the metal tooth or the facing crown can be simply incorporated in the outer-cap when a vertical dimension is not sufficient to arrange the resin or porcelain tooth. In this study, a technique is described in which the O'ring attachment with the metal outer-cap is applied to the few remaining teeth in the overdenture.departmental bulletin pape
<CLINICAL REPORT>Two Cases of Lateral Cervical Cyst
Get PDFP(論文)There are many theories regarding the origin of the lateral cervical cyst, among them two main theories are mentioned. One is that the cyst arises from the embryonic branchial cleft and the other is that it originates from salivary gland epithelium enclosed in the embryonic lymphnodes. The investigators who support the former theory refer to it as the branchial cyst while the workers who support the latter refer to it as the lymphoepitherial cyst. The typical histologic feature is that the inner wall is covered with squamous epithelium and that lymphoid tissue is embedded in the outer wall. This cyst is located on the lateral side of the neck, hence it is called the lateral cervical cyst. Recently we have encountered two cases of this cyst, hence the outline of the cases will be given. CASE 1 : An 18-year-old female noticed a painless swelling on the right side of her neck two months hence. The swelling slowly increased in size and eventually she came to our clinic. Except for an egg-like diffuse swelling that fluctuated to palpation, her condition was aggravated. 15ml of yellowish liquid solution was aspirated by puncture probatoria and the cyst was diagnosed as a lateral cervical cyst. As a result the cyst was surgically removed. This case was diagnosed as a lateral cervical cyst, "BaileyI type," by operative and post operative pathological findings. CASE 2 : A 15-year-old female child noticed two walnut-like swellings on the right side of her upper neck about six months before coming to our clinic and was immediate referred to a surgeon. At surgery one cyst was removed. The cyst was diagnosed as non-mallignant. After surgery the remaining cyst grew in size and dimension. The swelling was 50mm in diameter on the center right side of the angulus mandiblae. At the first we considered the swelling as tuberculous lymphadenitis but after further examination we diagnosed the case as lateral cervical cyst and thus removed it by surgical methods. The cyst was diagnosed as a lateral cervical cyst, "Bailey II type" by operative and pathological findings.departmental bulletin pape