Ken-ichi HANAUE

Tokyo Dental College

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Takahiko Shibahara

Tokyo Dental College

Hiroyasu Noma

Tokyo Dental College

Kiyohiro Kasahara

Tokyo Dental College

Yoshito Takasaki

The University of Tokyo

M. Inagawa

National Hospital Organization Takasaki Medical Center

Masanori Ishikawa

Niigata Prefectural Central Hospital

Ryoichi HAGIHARA

National Hospital Organization Takasaki Medical Center

Masayasu Shibano

National Hospital Organization Takasaki Medical Center

Takeshi Nomura

Tokyo Dental College

E Takeda

Tokyo Dental College

Cooperative Institutions

Tokyo Dental College

National Hospital Organization Takasaki Medical Center

Tokyo Dental College Ichikawa General Hospital

National Medical Research Center of Dentistry and Maxillofacial Surgery

Osaka University

Takasaki City University of Economics

Hokkaido University

Niigata University

Teikyo University

Kanazawa University

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Two cases of odontogenic carcinoma in the mandible

Japanese Journal of Oral & Maxillofacial Surgery (2010)

Ken-ichi HANAUE Sayaka Shiiki E Takeda Tomohiro Yamauchi Takahiko Shibahara

Most mandibular carcinomas occur in the gingival epithelium. However, some mandibular carcinomas originate from the odontogenic epithelium. Such lesions are called odontogenic carcinomas. Carcinomas primarily occurring in jaw bones are called primary intraosseous squamous cell carcinomas. We report 2 cases of odontogenic carcinoma that occurred primarily in the mandible.Patient 1 was a 69-year-old man without abnormal findings in the oral mucosa. Orthopantomography revealed a radiolucent lesion containing the crown of an impacted tooth. Right hemimandibulectomy, right functional neck dissection, and immediate reconstructive surgery using an A-O plate and a pectoralis major myocutaneous flap were performed. Histopathological examination showed a poorly-differentiated squamous cell carcinoma.Patient 2 was a 56-year-old woman without abnormal findings in the oral mucosa. Orthopantomography revealed a cystic structure containing an impacted tooth in the mandible. Left segmental resection of the mandible, left functional neck dissection, and immediate reconstructive surgery using an A-O plate were performed. Histopathological examination showed a well-differentiated squamous cell carcinoma, and transition of the epithelium of the cyst to squamous cell carcinoma was evident.Although patient 1 died of another disease, the prognosis of patient 2 is good, and niether metastasis nor recurrence has been detected for more than 10 years after surgery.

Mandible (arthropod mouthpart)

Neck dissection

10.5794/jjoms.56.170

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A case of pleomorphic adenoma in the region of the sublingual gland

Japanese Journal of Oral & Maxillofacial Surgery (2015)

Ryoichi HAGIHARA Masayasu Shibano Ken-ichi HANAUE M. Inagawa Yoshito Takasaki

Pleomorphic adenoma is the most common benign tumor of the salivary glands. Most cases develop in the region of the parotid gland, and few occur in the region of the sublingual gland. We describe our experience with a case of pleomorphic adenoma arising in the region of sublingual gland. Case patient: a 47-year-old man. Chief complaint: a tumor mass arising in the left side of the mouth floor. Facial expression: bilaterally symmetric, non-palpable regional lymph nodes. Present illness: a movable, elastically solid mass, measuring 25 × 14 mm, in the left side of the mouth floor. Findings on magnetic resonance imaging (MRI): on T2-weighted images, a slightly heterogeneous, high signal tumor mass in the left side of the mouth floor. Signal intensity as strong as muscle was observed on T1-weighted images. We diagnosed a sublingual gland benign tumor on MRI and suspected pleomorphic adenoma on fine-needle aspiration. We therefore performed extirpative surgery of the tumor, including the sublingual glands, from the oral cavity in May 2011. The histopathological diagnosis was pleomorphic adenoma. It has been 3 years since surgery, and no systemic or local abnormality has been found. A dequate follow-up for relapse and malignant transformation is considered essential.

Sublingual gland

Floor of mouth

Benign tumor

10.5794/jjoms.61.177

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Citations (3)

Course of Fracture Line in Sagittal Splitting of Human Mandible

The Bulletin of Tokyo Dental College (2007)

Ken-ichi HANAUE Akira Katakura Kiyohiro Kasahara Isao Kamiyama Takashi Takaki

We performed sagittal splitting osteotomy using fresh, unfixed cadavers. Observation was carried out macroscopically and with light microscopy and 3-dimensionally reconstructed images. The aim of this study was to clarify the relationship between the fracture line and the Haversian canal and Haversian lamellae. Macroscopic observation revealed that the fracture line run through the mandibular angle from the inferior rim of the mandibular ramus towards the posterior rim, passing almost through the center of the ridgeline. Histological observation showed that the fracture line tended to run along the curve of the lamellar structure. The incidence of the fracture line running along the lamellar structure of the Haversian lamellae was approximately 65% (21 cases), and the incidence of the fracture line also cutting across the Haversian canal without passing along the lamellar structure of the Haversian lamellae was approximately 35% (11 cases). Observation of 3-dimensional reconstruction images revealed that the section of Haversian canal near the mandibular angle essentially runs from the mandibular head to the inferior rim of the mandible, and that the fracture plane ran similarly. The direction of an impact-associated bone fracture line is infiuenced by the structures that constitute the lamellar bone such as Haversian canals, Haversian lamellae and interstitial lamellae, with fracture lines tending to run through those parts of the bone that have a low physical bond strength. This suggests that the ideal direction of action of the bone chisel in sagittal splitting surgery is the one in which no resistance to the path of the Haversian canal is encountered.

Osteon

Mandible (arthropod mouthpart)

10.2209/tdcpublication.48.163

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Citations (7)

A balloon pumping technique for treatment of internal derangement of the temporomandibular joint: A further study

International Journal of Oral and Maxillofacial Surgery (1997)

Kenji Sasaki Yasuki Motozawa H Tamura E Takeda Tatsuro Yamauchi

Derangement

10.1016/s0901-5027(97)81241-6

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A Case of Inferior Alveolar Nerve Perception Disorder Associated with Complete Dentures in a Patient with Advanced Alveolar Ridge Resorption

Japanese Journal of Oral Diagnosis / Oral Medicine (2014)

Ken-ichi HANAUE Yoshito Takasaki M. Inagawa Ryoichi HAGIHARA MASANOBU HIKIDA

Sensory disturbance resulting from denture pressure may be caused by advanced alveolar ridge resorption in a patient with an edentulous jaw. We report our observations of a patient with complete dentures with inferior alveolar sensory nerve disturbance due to alveolar ridge resorption associated with a mandibular canal.The patient was a 65-year-old woman, who had begun using complete lower dentures six years earlier. She had become aware of dysesthesia of an area innervated by the right mental nerve, and also hypoesthesia, and thus consulted the Tokyo Dental College Suidobashi Hospital for oral surgery.Hypoesthesia of the area innervated by the mental nerve, i.e. dysesthesia, and gingival area dysesthesia in response to pressure on the right mandibular molar tooth were noted at the time of the first medical examination. Medical treatments performed included denture adjustment, medications, and rehabilitation guidance to restore sensation. The hypoesthesia disappeared progressively within two months, and the dysesthesia resolved three weeks thereafter. The sensory testing method used for this patient enabled both quantitative assessment of the disorder and evaluation of the recovery process over time. Based on the features of each laboratory procedure, the author considers it to be important to assess perception disorders comprehensively.

Hypoesthesia

Inferior alveolar nerve

Dysesthesia

Mental nerve

Mental foramen

Alveolar ridge

10.15214/jsodom.27.231

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Experimental study of fracture line in compact bone. II. Course of fracture line on sagittal splitting of human mandible.

Japanese Journal of Oral & Maxillofacial Surgery (2002)

Ken-ichi HANAUE Hiroyasu Noma Takahiko Shibahara

Based on the experimental results obtained by splitting a rabbit femur, the mandible in a human cadaver was split by the sagittal splitting technique. In addition to macroscopically and microscopically examining the course of the fracture line, three-dimensionally reconstructed images were studied. Macroscopic examination showed that the course of a fracture line was nearly constant.On microscopic examination, we confirmed a trend for the course of the fracture line to be along the cementing line or the curve of the haversian lamella, or both. The three-dimensionally reconstructed images showed that the fracture surface was nearly parallel to the direction of the haversian canal.These findings indicate that the course of fracture line is influenced by the structures composing lamellar bone, such as the haversian canal, haversian lamella, interstitial lamella, and cementing line. These structures may account for the preferred path of fracture lines in the bone. Furthermore, we confirmed that the direction of the chisels used for sagittal splitting was appropriate.

Lamella (surface anatomy)

Line (geometry)

Mandible (arthropod mouthpart)

10.5794/jjoms.48.161

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Citations (1)

Forearm flap in oral cavity reconstruction: A functional evaluation.

Journal of Japanese Society of Oral Oncology (2000)

Takahiko Shibahara Hiroyasu Noma Masanori Ishikawa Kiyohiro Kasahara Ken-ichi HANAUE

1988年から1998年の間に前腕皮弁による即時再建術を100症例に対して行った。口腔再建に使用した前腕皮弁について, 知覚回復, 組織学的変化, 咀嚼・会話機能を測定し長期的に判定することを目的とした。知覚機能検査では移植60カ月以降で回復傾向が見られた。前腕皮弁から採取した移植組織の形態的変化は移植後1か月から75か月まで観察が行われた。前腕皮弁の経時的変化から, 移植10カ月後より粘膜様の形態的変化を示した。アンケート調査を用いて, 構音・咀嚼機能を判定した。会話機能は殆どの患者に満足のいく回復が得られ, 術後の経過時間に併せて回復も見られた。前腕皮弁の応用は形態的のみならず機能面においても優れた皮弁であると考えられた。

10.5843/jsot.12.1

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Citations (3)

Experimental study of fracture line in compact bone. I. Course of fracture line on split sections of rabbit femur.

Japanese Journal of Oral & Maxillofacial Surgery (2002)

Ken-ichi HANAUE Hiroyasu Noma Takahiko Shibahara

To determine whether there are paths for fracture lines, along which the cortical bone of long bones tends to split, a rabbit femur was split with a chisel and the course of the fracture line was investigated. Macroscopic observation of the rabbit femur confirmed that the course of the fracture line of the split bone has a constant direction. Microscopic cross-sectional observation showed that the fracture line ran along the curve of the cementing line, haversian lamella, or both. Microscopic examination of longitudinal sections showed that the course of the haversian canal was nearly parallel to the long axis of the bone. Furthermore, small cavities in the bone were also arranged parallel to this direction.We thus confirmed that the fracture line tends to occur along lamellar structures or areas with weak physical and bond strength.

Lamella (surface anatomy)

Line (geometry)

Rabbit (cipher)

10.5794/jjoms.48.154

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Citations (1)

Sensory recovery after oral cavity reconstruction: A comparison between pectoris major myocutaneous flaps and forearm flaps.

Japanese Journal of Oral & Maxillofacial Surgery (1999)

Takahiko Shibahara Hiroyasu Noma Yoshito Takasaki Kiyohiro Kasahara Yatuka TAMADA

We investigated the degree of recovery of sensory functions by pectoralis major myocutaneous flaps (muscle flap group) and forearm flaps (skin flap group). Twenty-six patients who underwent ablative surgery were studied. A pectoris major muscle flap was used in 8 patients, and a forearm flap was used in 18 patients. SW sensory, two-point discrimination (2 PD), thermal pain, and microcirculatory blood flow were measured. The SW value was maintained at a high level in the muscle flap group, but decreased gradually after 60 months in the skin flap group. The time course of 2 PD indicated a faster recovery in the skin flap group. Thermal pain values did not differ significantly between the two groups.Blood flow in the oral cavity mucosa was higher than that in the skin. In most patients, blood flow in the skin flap was similar to that in the skin. There were no marked timerelated changes in blood flow in either group, but blood flow in the forearm flap was clearly lower.

10.5794/jjoms.45.609

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