Kyushu University Academic Staff Educational and Research Activities Database
Researcher information (To researchers) Need Help? How to update
Tomohiro Yamada Last modified date:2021.06.10

Associate Professor / Division of Maxillofacial Diagnostic and Surgical Sciences
Department of Dental Science
Faculty of Dental Science

Graduate School
Undergraduate School
Other Organization

E-Mail *Since the e-mail address is not displayed in Internet Explorer, please use another web browser:Google Chrome, safari.
 Reseacher Profiling Tool Kyushu University Pure
Academic Degree
PhD of Dental Medicine
Country of degree conferring institution (Overseas)
Yes Doctor
Field of Specialization
Oral and maxillofacial sugery
Total Priod of education and research career in the foreign country
Outline Activities
In Kyushu University Hospital, Oral and Maxillofacial Surgery, I provide medical treatment for maxillofacial congenital anomalies, acquired jaw deformities, and oral tumors. Besides, I make research activities for clarification of these diseases and development of novel therapeutic strategies. In addition, I teach practice guidance for undergraduate students and postgraduate residents, and research directions to graduate students.
I am also a member of the Medical Safety Management Department, working as a Safety Manager of Dental Department, dealing with medical accidents, preventive measures, and education.
Research Interests
  • Basic and clinical research for developmental jaw deformnities
    keyword : jaw deformity, treatment strategy
  • Studies for diagnosis and treatment for oral cancer
    keyword : oral cancer, diagnosis, treatment, hypoxia, GVHD
  • Basic and clinical research for congenital oral deformities.
    keyword : cleft lip and palate, development, prevention
  • Reconstruction of temporomandibular joint
    keyword : temporomandibular joint, artificial TMJ, titanium
Current and Past Project
  • Although the cause of the jaw asymmetry seems to be likely to be due to dysfunction of muscle, so far there is little report on muscle function and histological examination of the same disease. Facial forms without reported in Japan of the things about the context of the vertical dimension and masticatory muscles there is a report of the research team of Western, non-deflection side in the lower jaw asymmetry patients in the application authors of the three-dimensional analysis is long face, polarized place side was focused on the molecular pathological nature of the masticatory muscles from having the morphological characteristics of the short face. So do the muscle biopsy of the mandibular asymmetry cases in this study, the type of muscle fibers, as well as examine the difference between the left and right of expression of muscle and bone-related marker gene, clarify the relationship with the other evaluation items of jaw deformity.
Academic Activities
1. Yamada T, Sugiyama G, Mori Y, Orthognarthic surgery in the consistent treatment protocol of cleft lip and palate., 13th International Cleft Lip and Palate Foundation, 2019.07, Cleft lip and palate is treated in the consistent treatment protocol, and consideration for growth of the jaw is generally taken. Therefore, jaw deformity due to the maxillary undergrowth tends to decrease in recent years. However, malocclusion and patient-specific jaw deformities sometimes occur due to sagittal, vertical and horizontal undergrowth of maxilla. In addition, constriction of maxillary dentition, lingual inclination of the maxillary incisor, inner and posterior displacement of the minor maxillary segment are noted, and displacement of the mandible can be associated with asymmetry of the maxillary dentition. As a result, open bite and/or facial asymmetry as well as mandibular prognathism are often recognized. In the choice of technique, care must be taken. For example, despite maxillary anterior positioning is essential, the posterior movement of the mandible alone may cause a shortage of oral cavity volume for containing the tongue or a constriction of the airway, which may lead to post-operative dysfunction. If the maxilla is moved forward, the soft palate may also be pulled forward, resulting in nasopharyngeal insufficiency. Furthermore, it is necessary to keep in mind the tension in the relapsed direction due to scarring and the lack of blood flow.
Therefore, in our hospital, in the case of mild prognathism or asymmetry of the mandible, which does not require forward movement of the upper jaw, posterior movement of the mandible alone, and two-jaw osteotomy if the amount of forward movement of the maxilla is within 5 mm. And distraction osteogenesis (DO) of the maxilla is often performed when maxillary movement of more than 5 mm is required. In DO, internal fixation device are sometimes used, but due to the degree of freedom of movement direction and the stability of the result, we mainly use the external fixation device, RED system. In order to minimize the influence on nasopharyngeal function, maxillary anterior segment distraction osteogenesis (MASDO) is considered useful.
With these treatment strategies, aimed correction for jaw deformities can be generally achieved, and by correcting the facial skeleton to appropriate position, not only masticatory function but also aesthetic improvement is obtained. Furthermore, definitive lip repair usually becomes easy after orthognathic treatment of the maxilla for cleft lip patients..
Membership in Academic Society
  • Japanese Society of Oral Oncology
  • The Japanese Teratology Society
  • Japanese Academy of Maxillofacial Implants
  • The Japanese Society of Oral Diagnosis/Oral Medicine
  • Japanese Society of Oral Therapeutics and Pharmacology
  • Japanese Stomatological Society
  • Japanese Cleft Palate Association
  • The Japanese Society for Jaw Deformities
  • Japanese Society of Oral and Maxillofacial Surgeons
Educational Activities
For undergraduate students, I make lectures mainly on maxillofacial trauma and neurological orofacial diseases, and guidance in clinical practice.
In addition, I have been researching guidance around the pathological conditions for congenital and developmental abnormalities, and oncology of the maxillofacial region for graduate students.
Other Educational Activities
  • 2021.04.
  • 2019.11.
  • 2020.04.
  • 2019.04.
  • 2018.06.
Professional and Outreach Activities
While helping the International Cleft Palate Foundation, it is mainly carried out medical assistance activities to Vietnam.
From November 2019, we have been accepting clinical trainee from Egypt and conducting clinical training..