Shunichi Kojima

Publications (3)3.19 Total impact

• Article: Gummy smile and facial profile correction using miniscrew anchorage.

  Masato Kaku, Shunichi Kojima, Hiromi Sumi, Hiroyuki Koseki, Sara Abedini, Masahide Motokawa, Tadashi Fujita, Junji Ohtani, Toshitsugu Kawata, Kazuo Tanne
  [show abstract] [hide abstract]
  ABSTRACT: This case report describes the treatment of a case involving a skeletal Class II facial profile with a gummy smile. While treating a facial profile and a gummy smile, the outcome may not always be successful with orthodontic therapy alone. For this reason, surgical therapy is often chosen to gain an esthetic facial profile and a good smile. However, sometimes the patients reject surgical treatment and an alternative method must be considered. Skeletal anchorage systems such as miniscrews are now frequently used for correcting severe malocclusion that should be treated by surgical therapy. In this case report, we treated a skeletal Class II malocclusion with a convex profile and a gummy smile using miniscrews, which were placed in the upper posterior and anterior areas. The active treatment period was 3.5 years, and the patient's teeth continued to be stable after a retention period of 36 months.
  The Angle Orthodontist 01/2012; 82(1):170-7. · 1.21 Impact Factor
• Article: In-vitro and in-vivo study of periodontal ligament cryopreserved with a magnetic field.

  Hiroko Kamada, Masato Kaku, Toshitsugu Kawata, Hiroyuki Koseki, Sara Abedini, Shunichi Kojima, Akemi Sumi, Masahide Motokawa, Tadashi Fujita, Junji Ohtani, Norio Ohwada, Kazuo Tanne
  [show abstract] [hide abstract]
  ABSTRACT: The purpose of this study was to examine the effect of a new cryopreservation method with a magnetic field on periodontal regeneration in vitro and in vivo. Human periodontal ligament cells were frozen in 10% dimethyl sulfoxide by using a programmed freezer with a magnetic field. Cells were cryopreserved for 3 days at -150°C. Immediately after thawing, collagen type I and alkaline phosphatase gene expression were determined by real-time polymerase chain reaction. Incisors were extracted from 15-week-old Wistar rats and cryopreserved or dried for 3 days. Then the incisors were replanted into the same sockets. Ninety days after transplantation, they were observed under light microscopy. There was no difference in the messenger RNA expression of collagen type I between the cryopreserved and the control groups. The expression of alkaline phosphatase messenger RNA in the cryopreserved group was slightly decreased compared with the control group. There was no progressive root resorption in the teeth that were replanted immediately (control group) or cryopreserved. However, there was widespread root resorption and ankylosis in the dried teeth. These results show that a magnetic field programmed freezer can be successfully used for cryopreservation of teeth.
  American journal of orthodontics and dentofacial orthopedics: official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics 12/2011; 140(6):799-805. · 1.33 Impact Factor
• Article: Treatment of a case of skeletal class II malocclusion with temporomandibular joint disorder using miniscrew anchorage.

  Masato Kaku, Hiroyuki Koseki, Aki Kawazoe, Sara Abedini, Shunichi Kojima, Masahide Motokawa, Junji Ohtani, Tadashi Fujita, Toshitsugu Kawata, Kazuo Tanne
  [show abstract] [hide abstract]
  ABSTRACT: At the present time, there are no reports in the literature on the treatment of temporomandibular joint disorder (TMD) by intrusion of molars using mini-screws. This case report describes the treatment for a female patient, aged 19 years seven months, with a TMD and an excessive lower anterior facial height. Overjet and overbite were +5.0 mm and +0.5 mm, respectively. The patient had a history of orthodontic treatment in which her first premolars were all extracted. During the first orthodontic treatment, a clockwise mandibular rotation was observed as a result of the increase of posterior dentoalveolar height. She had temporomandibular joint (TMJ) pain during mouth opening and complained of difficulty in eating due to masticatory dysfunction. The pretreatment Schuller views of both TMJ showed a posterior condyle position. In order to correct the overjet, molar relationship and the mandibular condyle position, a miniscrew was inserted into the palatal region of the upper first molar to intrude the upper posterior teeth. As the upper molars were intruded, the overjet was decreased, and a class I molar relationship was achieved by a counterclockwise mandibular rotation. After one year of treatment, an acceptable occlusion was achieved, and the condyle moved into centric position in the glenoid fossa. The patient's teeth continued to be stable, and she had no pain in TMJ after a retention period of three years. The result of this treatment showed that molar intrusion using miniscrew anchorage is effective for treatment of a TMD patient with a posterior condyle position.
  Cranio: the journal of craniomandibular practice 04/2011; 29(2):155-63. · 0.66 Impact Factor