ADAPTIVE PROPERTY OF CRANIAL FLOOR AND MAXILLOFACIAL TISSURE WITH MASTICATIONAL CHANGES

颅底颌面部组织随咀嚼变化的适应性

• 批准号: 05671732
• 负责人: KIYOSUE Seigo
• 金额: $ 1.34万
• 依托单位: FUKUOKA DENTAL COLLEGE
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05671732/
• 关键词: GROWTH AND DEVELOPMENT; MAXILLOFACIAL TISSUE; MINIATURE PIG; BITE OPENING; 咬合機能; 咬合変化; 脳頭蓋底; 頭部X線規格写真

It is believed that the maxillofacial tissue has adaptive property in response to occlusion and mastication. It is thought that this adaptive property accelerates bone remodeling, causing skeletal malocclusion and aggravates the condition.this study attempts to look into the adaptive property of the maxillofacial tissue by modifying occlusion via intrusion of the upper molars.The initial plan was designed to use Miniature pig G.However, the plan was modified to use Yucatan micro pig, as a result of difficulty in obtaining the earlier. In 1993, the retention device and head stabilizing device were made to take the cephalogram of the normal group as the standard. The reliability was confirmed. With regards to the optical microscope study, The original intent was to analyze the spheno-occipital synchondrosis, vomer, temporomandibular joint, and masticatory muscles. However, due to the limited number of specimen and other practical difficulties, the temporomandibular joint was chosen since the change is most prominent here. Two groups of 15 weeks old and 33 weeks old specimens were chosen. In 1994, experiment was carried out for the study group also. Bite plate was inserted in the molar region of the 15 weeks group to extrude the molar, which resulted in open bite or mandibular protrusion. This was confirmed intraorally. Cephalograms and decalcified specimen were made for the 33 weeks group. Cephalometric comparisons revealed slight discrepancies in the angles of the anterior cranial floor and the posterior cranial floor, and also in the mandibular angles. Depending on the individual, some showed open bite tendency and others showed mandibular protrusion and the reasons for this phenomenon was not clear. Also, the skull and maxilla showed virtually no noticable differences. The decalcified specimens showed thickness difference of the condylar cartilage in the temporomandibular joint.

据信颌面组织具有响应咬合和咀嚼的适应性特性。人们认为这种适应性会加速骨重塑，导致骨骼错牙合并加重病情。本研究试图通过侵入上磨牙来改变咬合来研究颌面组织的适应性。最初的计划是使用微型猪G。然而，由于早期难以获得，该计划被修改为使用尤卡坦微型猪。 1993年以正常组头颅片为标准制作了固位装置和头部稳定装置。可靠性得到了证实。关于光学显微镜研究，最初的目的是分析蝶枕骨联合、犁骨、颞下颌关节和咀嚼肌。但由于标本数量有限以及其他实际困难，选择颞下颌关节，因为这里的变化最为突出。选择两组 15 周龄和 33 周龄的标本。 1994年，研究组也进行了实验。 15周组在磨牙区置入咬合板，挤压磨牙，导致开牙合或下颌前突。这在口内得到了证实。为33周组制作头颅照片和脱钙标本。头影测量比较显示前颅底和后颅底的角度以及下颌角度存在轻微差异。因人而异，有的表现出开咬倾向，有的则表现出下颌前突，但造成这种现象的原因尚不清楚。此外，头骨和上颌骨几乎没有显示出明显的差异。脱钙标本显示颞下颌关节髁软骨厚度差异。