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Volume 59, Issue 8
Displaying 1-10 of 10 articles from this issue
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Preface
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[in Japanese]2013 Volume 59 Issue 8 Pages 505
Published: August 20, 2013
Released on J-STAGE: December 13, 2014
JOURNAL FREE ACCESSDownload PDF (319K)
Original article
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Yu ITO, Takumi MORITA, Tomoko MATSUNAGA, Hisanobu MARUO, Katsunari HIR ...2013 Volume 59 Issue 8 Pages 506-516
Published: August 20, 2013
Released on J-STAGE: December 13, 2014
JOURNAL FREE ACCESSThe physiological load on the temporomandibular joint (TMJ) plays an important role in maintenance of normal morphological structure and functions of the TMJ. On the other hand, overload on the TMJ can cause temporomandibular disorders. Therefore, it is important to understand the magnitude and direction of load on the TMJ when studying the mechanism for maintenance of normal morphological structure and functions of the TMJ. The authors presumed that compressive force on the TMJ is manifested as movements of the mandibular condyle towards the articular eminence after resection of the articular eminence. Therefore, we estimated the magnitude and direction of load on the TMJ on the basis of changes in movements of the mandibular condyle before and after resection of the articular eminence. EMG activities of the masseter muscle were simultaneously recorded with movements of the condyle as well as the incisor point during fictive mastication induced by electrical stimulation to the cortical masticatory area of anesthetized rabbits. As a result, resection of the articular eminence caused no significant change in EMG activities of the masseter muscle or movements of the incisor point. However, the position of the trajectory of the mandibular condyle shifted in an anterosuperior direction after resection of the articular eminence. In addition, forward projecting movements of the mandibular condyle were seen in the occlusal phase. It was suggested that the TMJ was constantly exposed to a load during masticatory movements, particularly during the occlusal phase. Force holding the articular disc between the articular eminence and the mandibular condyle has an important role in preventing the development of space that would allow the articular disc to move anteriorly.View full abstractDownload PDF (908K)
Case reports
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Keiichi ARAKAKI, Toshimoto TENGAN, Takahiro GOTO, Shigeki SAWADA, Joji ...2013 Volume 59 Issue 8 Pages 517-521
Published: August 20, 2013
Released on J-STAGE: December 13, 2014
JOURNAL FREE ACCESSThe incidence of monozygotic twins with cleft lip and palate is very low, and there have been few studies of longitudinal observations. The observation of monozygotic twins with different types of cleft lip and palate from the perspective of jaw growth facilitates comparison and evaluation of the effects of extrinsic and intrinsic factors. In this study, we observed monozygotic twin sisters with bilateral cleft lip and palate (BCLP) and unilateral cleft lip and alveolus (UCLA). In the child with BCLP in whom collapse occurred during jaw development, we placed a palatal plate and maxillary expansion appliance in infancy, and longitudinally compared her with her sister with UCLA. Although there were no marked differences in the growth or development of the middle face between the sister with BCLP, in whom jaw guidance was performed from birth, and the sister with UCLA at the age of 7 years and 11 months, mandibular growth in the inferior direction was noted in the sister with BCLP.
The results suggest that careful follow-up of both patients, including occlusal control, is necessary.View full abstractDownload PDF (442K) -
Akira KIMOTO, Yoshiyuki SHIBUYA, Mai ASANO, Naoki TAKATA, Yuka TAKEUCH ...2013 Volume 59 Issue 8 Pages 522-526
Published: August 20, 2013
Released on J-STAGE: December 13, 2014
JOURNAL FREE ACCESSLeiomyoma is a benign tumor of smooth muscle origin, and usually arises in the uterus, alimentary tract, and skin. Since the first report by Blanc in 1884, most reported leiomyomas have been angioleiomyomas. In the present report, we describe a rare type of leiomyoma arising in the tongue of a 25-year-old woman. The tumor was an 18 × 7 mm, well-demarcated, and slow growing mass located in the right margin of the tongue. The entire lesion was excised, and the pathological diagnosis was solid leiomyoma. The patient has been followed up for 1 year 2 months after surgery, without any evidence of recurrence.View full abstractDownload PDF (572K) -
Chiaki ASANO, Norio KUROYANAGI, Shigeki OCHIAI, Takuya OYABU, Hitoshi ...2013 Volume 59 Issue 8 Pages 527-531
Published: August 20, 2013
Released on J-STAGE: December 13, 2014
JOURNAL FREE ACCESSExtrusion of endodontic sealer into the mandibular canal caused by overfilling root canals during endodontic treatment has a negative effect on the prognosis of endodontically treated teeth. Chemical neurotoxicity and mechanical compression may injure the inferior alveolar nerve (IAN), resulting in sensory disturbances such as pain or paresthesia. This paper briefly reports our experience and reviews the literature pertaining to the treatment of overfilled root canals with extrusion of material into the mandibular canal. In our patient, endodontic filling material extruded from the root apex of the left mandibular first molar and invaded the mandibular canal on that side, causing spontaneous pain in the affected region. A surgical procedure for removal of the material and decompression of the IAN is most effective. A piezoelectric device was used for effective and safe clinical management, providing relief from pain and resolving IAN injury.View full abstractDownload PDF (450K) -
Ko ITO, Yoko FUJIMOTO, Satoshi IWAI, Kosuke TAKAHASHI, Hiroyuki OKADA, ...2013 Volume 59 Issue 8 Pages 532-536
Published: August 20, 2013
Released on J-STAGE: December 13, 2014
JOURNAL FREE ACCESSBenign fibrous histiocytoma commonly arises in the abdomen and sun-exposed skin and rarely occurs in the oral cavity. A case of benign fibrous histiocytoma arising around the mental foramen is reported. A 23-year-old woman was referred to our hospital because of a painless small mass on the right side of the subgingiva at the first premolar of the mandible, associated with hypoesthesia of the right mental region. The biopsy specimens were pathologically diagnosed to be a non-epithelial tumor, and the tumor was excised under general anesthesia. Microscopically, the tumor consisted of spindle-shaped cells and polygonal cells, and partly formed a storiform pattern. Immunohistochemically, the spindle-shaped cells were positive for vimentin, and the polygonal cells were positive for vimentin and CD68, but both types of cells were negative for NF, S-100, actin, EMA, factor VIII, and CD34. Based on these findings, the tumor was diagnosed to be a benign fibrous histiocytoma. Thirteen weeks after the operation, the hypoesthesia of mental region had completely disappeared. No evidence of recurrence has been noted as of 8 years after surgery.View full abstractDownload PDF (654K) -
Masaya KIMOTO, Norihiko MIZUTA, Takayuki NODA, Masakazu HAMADA, Yoshia ...2013 Volume 59 Issue 8 Pages 537-541
Published: August 20, 2013
Released on J-STAGE: December 13, 2014
JOURNAL FREE ACCESSA 37-year-old man with a mass of the proglossis was prescribed ointment and gargle for stomatitis at another hospital. He consulted our hospital because of growth of the mass. Intraoral examination revealed a well defined and marked indurate mass of the proglossis accompanied by an ulcer. The histopathological diagnosis was granulation tissue. Serological examination revealed that STS was positive, and antibodies for Treponema pallidum were positive. We diagnosed primary syphilis of the proglossis because he had an opportunity for infection from the oral cavity 4 weeks previously. Following our request, the patient was treated by a local physician.View full abstractDownload PDF (585K) -
Masaya NAKANO, Moriyasu ADACHI, Syunsuke KIMURA, Yoshiko KATAYAMA, Te ...2013 Volume 59 Issue 8 Pages 542-545
Published: August 20, 2013
Released on J-STAGE: December 13, 2014
JOURNAL FREE ACCESSDermoid cysts of the floor of the mouth are relatively rare. We present the case of a large dermoid cyst involving the floor of the mouth. A 21-year-old man presented with swelling of the floor of the mouth. In this patient, CT and MRI showed a cystic lesion involving the floor of the mouth and revealed penetration of the mylohyoid muscle in the midline. The cyst was surgically removed via an intraoral approach. Histopathologically, it was diagnosed as a dermoid cyst. Complete extirpation is the treatment of choice for such dermoid cysts. The selection of surgical approach is important. Several reports have described using intraoral and extraoral approaches in patients with cysts extending over and under the mylohyoid muscle. In our patient, however, the cyst was successfully excised by an intraoral approach.View full abstractDownload PDF (606K) -
Moriyasu ADACHI, Shunsuke KIMURA, Masaya NAKANO, Yoshiko KATAYAMA, Tet ...2013 Volume 59 Issue 8 Pages 546-549
Published: August 20, 2013
Released on J-STAGE: December 13, 2014
JOURNAL FREE ACCESSDepending on the residual bone height after marginal mandibulectomy, fracture may occur postoperatively. We report a bone graft technique using the coronoid process for marginal mandibulectomy. In the patient, the coronoid process of the affected side was crushed, and a bone graft was placed in the jaw defect. A 62-year-old woman with gingival cancer of the right mandibular molar region (T2N1M0) underwent marginal mandibulectomy including the mandibular canal and functional neck dissection on the affected side. The coronoid process was resected with the tumor, and a bone graft was harvested with bone-cutting forceps from a site at least 10 mm from the soft-tissue resection margin and the mandibular foramen. Immediately after marginal mandibulectomy, the vertical dimension of the mandible at the thinnest portion was 7 mm, but improved to 15 mm after surgery.View full abstractDownload PDF (498K) -
Kenji YAMAGATA, Osamu BABA, Naomi KANNO, Hiroki NAGAI, Toru YANAGAWA, ...2013 Volume 59 Issue 8 Pages 550-554
Published: August 20, 2013
Released on J-STAGE: December 13, 2014
JOURNAL FREE ACCESSWe describe a rare case of cervical lymph-node metastasis from gastric cancer that was detected in a specimen obtained by neck dissection for tongue cancer. The patient was a 63-year-old man presenting with a painful mass of the tongue. The clinical diagnosis was tongue cancer (T2N1M0). He had a medical history of stage IB gastric cancer and had received distal gastrectomy with D2 dissection 3.5 years previously. Functional neck dissection, hemiglossectomy, and reconstruction using a forearm flap were performed under general anesthesia. Some small, elastic hard lymph nodes were observed at levels IV and V. The postsurgical course was uneventful. Pathological examination of the specimen obtained by neck dissection revealed metastasis from squamous cell carcinoma (SCC) at level II and adenocarcinoma (AC) at levels IV and V. The AC was diagnosed as metastasis from gastric cancer. Although the patient received systemic chemotherapy with S-1, paclitaxel, irinotecan, and 5-FU with levofolinate, peritoneal dissemination and multiple bone metastases spread, and the patient died 1 year 5 months after surgery.View full abstractDownload PDF (819K)
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