1990 Fiscal Year Final Research Report Summary
Effect of Corticotomy on Maxillary traction protraction
| Project/Area Number |
02670934
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
小児・社会系歯学
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| Research Institution | Matsumoto Dental University |
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Principal Investigator |
DEGUCHI Toshio Matsumoto Dent Col.Dentistry Prof., 医学部, 教授 (30139852)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIKAWA Yoshiyasu Matsumoto Dent Col.Dentistry Associate Prof., 医学部, 講師 (20139885)
MATSUDA Yasuaki Matsumoto Dent Col.Dentistry Associate Prof., 医学部, 講師
NISHIMOTO Masahiro Matsumoto Dent Col.Dentistry Assistant Prof., 医学部, 講師 (80164606)
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| Project Period (FY) |
1990 – 1992
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| Keywords | Orthopedic Force / Corticotomy / Maxillary Protrusion / Growth Control / Protraction of Maxilla / Tranction of Maxilla / Jaw deformity |
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| Research Abstract |
Corticotomy is the smallest invasion method in orthognathic surgery. However, there are few reports comnined with corticotomy and orthopedic force appliance. Using Macaca fuscata, we studied five research studies (three main theme and two sub theme) to eatablish the benefit of the corticotomy operation method. One of these techniques was also applied to a patient.
Retraction of the full Maxilla We performed corticotomy in combination with posterior transfer of the Maxailla in four male Macaca fuscata and compared maxillary skeletal changes morphologically and histologically between the experimental group and two control animals In addition, strain experiments were carried out on the dry skulls using strain gauges. Posterior trasfer was negligible in the control group but marked in the experimental group.
Retraction of the maxillary anterior segment Using seven female Macaca fuscata, the effect of corticotomy in combination with the retraction of the maxillary anterior bone segment were e
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valuated. According to the dental cast and cephalometric analysis, the retraction volume of maxillary anterior bone segment in the experimental group was much larger when compared with the control group.
Protraction of the Maxilla For the purpose of clarifying the effects of corticotomy on maxillary protraction, an experimental study using five male Macaca fuscata was performed. In the experimental group that received corticotomy with maxillary protraction, apical base of maxillary bone protruded markedly.
The combined results of the three main studies were as follows ; (1) At the site of suture, active remodeling of the bone was observed in the control group, but relatively slight changes were seen in the experimental group. Strain experiments on the dry skull using a strain gauge confirmed that corticotomy decreased the load on each suture site. (2) In the proper alveolar bone of the Maxilla, resorption and addition of bone was marked in the control group, but no marked changes were observed in the experimental group.
Conclusion : Cortucotomy combined with retraction or protraction of the Maxilla seemed to have exerted the following effects ; in the control group, traction or protraction was diffused to the maxillofacial part via each suture site. However, in the experimental group, traction or protraction was difficult to diffuse since the compact bone is separated, resulting in favorable effects on retraction or protraction of alveolous between the Maxilla and maxillary proper alveolar bone connected only by the cancellous. One of these techniques was applied to the patient who was a 34 year female. The length of treatment term was shorter than normal for patients and the results was excellent. Less
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