Yoshishige Fujiki

Clinical and radiographic study of dens invaginatus

After a determination of the frequency of dens invaginatus by means of radiographic observations, various problems of its identification are discussed. The 188 teeth showing a distinct loop-shaped invagination apically on the radiograph were studied for the presence or absence of caries and periapical lesions. It was demonstrated that periapical lesions caused by caries are mostly due to interproximal caries and that the frequency of periapical lesions caused by caries in the dens invaginatus area was less than previously reported. Comments are made on the dens invaginatus cases having periapical lesions without caries and the parameters for future studies.

Dose-response relationship of cadmium embryotoxicity in cultured mouse embryos

Mouse embryos were exposed in vitro to 1.2 to 2.2 microM cadmium, and effects on embryotoxicity were examined after 39 h of culture. Teratogenic responses similar to in vivo were obtained at 1.2 to 2.2 microM with concomitant reduction in embryonic protein, while embryo deaths were increased from 13.8 to 93.3% at 2.0 to 2.2 microM. The response data of both teratogenicity and growth parameters, including embryonic protein, head length, crown-rump length, somite number, and protein and diameter of yolk sac, were acceptably fitted to a linear log-probit regression. These results suggest that (a) In chronic exposure conditions, the concentration of cadmium is a critical parameter in the manifestation of teratogenic potential, (b) as an estimation of interference in the growth of embryos, embryonic protein is one of the most sensitive endpoints while somite number is an insensitive criterion, and (c) a linear log-probit regression is applicable to the analyses of embryotoxicity data, including growth parameters in whole-embryo culture systems.

Radiographic study of mandibular nutrient canals

Abstract The appearance of nutrient canals in the mandibular anterior region was studied by evaluating the complete-mouth dental radiographs of 1,586 patients who were subdivided into four groups. The incidence of nutrient canals was very high in patients with periodontal disease, in patients of advanced age, and especially in edentulous patients. Nutrient canals appeared most frequently in radiographs demonstrating “above average” bone density with small diminutive trabecular spaces. Other factors influencing the presence of nutrient canals included the thickness of the alveolar bone, the quality of both cortical and cancellous bone, and the loss of mandibular teeth.

Radiographic observations of pyknodysostosis: Report of a case

A case of pyknodysostosis in a 32-year-old woman has been reported. The patient presented typical skeletal changes, separated cranial sutures, open fontanelles, partial aplasia of the terminal phalanges of the fingers and toes, and brachyphalanges. The oral findings included lesions resembling periapical cementoma, hypoplasia of the maxilla and mandible, crowding of teeth, and a median raphe.

Etiological considerations of simple bone cysts

The etiology of simple bone cyst is still controversial. Among a number of theories, the theory of ohe cyst originating from intramedullary hemorrhage following traumatic injury is widely accepted 1,2). However, there are some cases of simple bone cyst without history of trauma to the jaw. Jaffe 3~ suggested that these cysts might be caused by focal degeneration of, or hemorrhage into, the connective in tissue areas of fibrous dysplasia based upon his clinico-pathological study. The authors investigated nineteen cases with simple bone cysts radiographically and clinico-pathologically, considering the etiology of simple bone cyst.

Gd-DTPA enhanced MRI for the oral and maxillofacial cystic lesion

The authors present examples of the significantly improved diagnostic imaging for cystic lesions in the jaw bone, floor of the mouth and maxillary sinus with Gadolinium-DTPA (Gd-DTPA) enhanced MRI. Twelve cases of cystic lesions, which were 6 cases of intra-osseous odontogenic cysts and cystic tumors, 2 cases of epidermoid cysts in the floor of the mouth and 4 cases of cystic polyp of the maxillary sinus.Improved MR images provided useful information delineating the thickness of circumscribed soft tissue wall (cystic wall), the location of the intra-cystic substance and the configuration of the tumor masses.

Ameloblastoma with ulceration

ConclusionWe have discussed a case of ameloblastoma of the left lower jaw in a 29-year-old male. This tumor is believed to be of the central type and was connected with the gingival epithelium after invasion of the soft tissue outside of the jawbone where it formed a spontaneous ulcer on the gingiva.

Bone scintigraphy in solitary (Simple) bone cyst of jaw

Six cases of solitary (simple) bone cyst with typical clinical, radiographical, and histological findings were examined by bone scintigraphy. Bone scintigraphy using99mTc-HMDP was performed prior to operation. No uptake of99mTc-HMDP in these solitary bone cysts was demonstrated. On the other hand, 2 cases of florid osseous dysplasia (Melrose et al. 1976) associated with bone cavities resembling solitary bone cyst showed remarkable uptake of99mTc-HMDP.Six cases of solitary (simple) bone cyst with typical clinical, radiographical, and histological findings were examined by bone scintigraphy. Bone scintigraphy using99mTc-HMDP was performed prior to operation. No uptake of99mTc-HMDP in these solitary bone cysts was demonstrated.On the other hand, 2 cases of florid osseous dysplasia (Melrose et al. 1976) associated with bone cavities resembling solitary bone cyst showed remarkable uptake of99mTc-HMDP.

Clinico-radiographic and histopathological considerations of twenty four cases of adenomatoid odontogenic tumor

SummaryThe clinical and histological findings in these AOT cases support the previous reports of this lesion.Radiographically, these were some characteristic findings. Usually, this lesion shows a well demarcated and monolocular radiolucency, and calcified foci are scattered frequently in it. In the case of this tumor it was related to an embedded tooth, with a radiolucent lesion that extends apically from the tooth crown and involves a considerable portion of the root, or it was located interdentally without any relation to an embedded tooth. The periodontal space disappears at the tumor area. This radiographic finding offers to important sign to decide if thc tooth is in connection with the tumor.

Diagnosis of mucosal cyst in the maxillary sinus using advanced MR imaging techniques: Report of a case

In the present study, new MRI techniques were used to evaluated the pathologic condition of a mucosal cyst in the maxillary sinus. The contrast enhancement technique using Gd-DTPA clearly revealed the cystic nature of the lesion. The diagnostic information about the relationship between the mucosal cyst and periodontal disease, and the precise location of the cyst in relation to the walls of the maxillary sinus were obtained by panoramic MR image and alternate positioning of the patient.