Development of quantitative evaluation method for occlusal morphology and occlusal tooth contacts

咬合形态和咬合牙接触定量评价方法的开发

• 批准号: 12671888
• 负责人: NAKANO Masanori
• 金额: $ 0.58万
• 依托单位: The University of Tokushima
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12671888/
• 关键词: Occlusal morphology; Occlusal tooth contact; Occlusal facet; Jaw movement; Masticatory movement

Overall object of this research is to develop objective method for the evaluation of dental occlusion. Followings are outcomes of this research project.1. New workstation computer that was purchased with this budget improved data processing speed of stomatognathic diagnostic system.2. Occlusal facets on molar region were classified into six different types (AM, AD, BM, BD, CM, CD) according to the direction of its normal vector and its position. A, B and C represents medio-lateral position of each facet and direction of the normal vector of it, and M and D represents antero-posterior direction of the normal vector.3. Three-dimensional shape of occlusal surface and six degrees of freedom jaw movement data were combined to analyze dynamic transition of occlusal contacts '' during mastication. Distance between opposite occlusal surfaces and incident angle of the jaw closing f movement pathway were calculated with this method. These numerical parameters were utilized for the evaluation of … More occlusal contact during mastication. The results are as follows1) During fourth phase of chewing stroke, distance between opposing occlusal surfaces were shorter at AM and CM type occlusal facets. This tendency was remarkable at AM type facet on functional cusp of lower molar.2) During fourth phase of chewing stroke, angle between the jaw movement pathway and AM and CM type occlusal facets were relatively small (about 10 degrees). These angles of AD and CD type facets were ranged from 20 to 30 degrees.3) Incident angle of the terminal jaw closing movement was 30 degrees at BD type occlusal facet, and 40 degrees at BM type facet.4) During fifth phase of chewing stroke, distance between opposing occlusal surfaces was shortest at BD type occlusal facet. During fourth phase of chewing stroke, AM type occlusal facet on functional cusp of lower molar and opposing upper molar work as the functional guidance of masticatory movement. This finding suggest that functional property of these facets are mortaring and grinding. On the other hand, BD type occlusal facet works for squeezing, crushing and functional guidance for fifth phase of chewing stroke. The results of this study exhibit rational classification method for occlusal facet and functional properties of each occlusal facet were revealed. These findings provide valuable data to develop objective evaluation method for occlusal tooth contact. Less

本研究的总体目的是建立一种客观的评价牙合的方法。以下是本研究项目的成果：用这笔预算购买的新工作站计算机提高了口颌诊断系统的数据处理速度。根据法向量方向和位置将磨牙区咬合切面分为AM、AD、BM、BD、CM、CD 6种类型。A、B、C表示各关节面中外侧位置及其法向量方向，M、D表示法向量的前后方向。结合三维咬合面形状和六自由度颌部运动数据，分析咀嚼过程中“咬合接触”的动态过渡。用该方法计算了相对咬合面的距离和合颌运动路径的入射角。这些数值参数被用来评价咀嚼过程中更多的咬合接触。结果表明：1)咀嚼行程第四阶段，AM型和CM型牙合面相对咬合面之间的距离较短；下磨牙功能尖AM型小面有明显的这种倾向。2)咀嚼行程第四阶段，下颌运动通路与AM型和CM型咬合面夹角较小（约10度）。AD型和CD型切面的角度在20到30度之间。3)终颌闭合运动入射角在BD型咬合小关节面为30度，在BM型小关节面为40度。4)咀嚼行程第5期，BD型咬合面相对咬合面距离最短。在咀嚼中风的第四阶段，AM型咬合面在下磨牙的功能尖和相对的上磨牙上工作，作为咀嚼运动的功能指导。这一发现表明，这些切面的功能性质是砂浆和研磨。另一方面，BD型咬合小面对咀嚼中风第五期具有挤压、压碎和功能指导作用。本研究结果显示了合理的咬合小面分类方法，并揭示了各小面的功能特性。研究结果为建立牙合接触的客观评价方法提供了有价值的数据。少

项目成果

Abe, S.: "A kinetic analysis of occlusal contacts during masticating chewing-gum"J Jpn Prosthodont Soc. 44. 274-283 (2000)

Abe, S.：“咀嚼口香糖时咬合接触的动力学分析”Jpn Prosthodont Soc。

Miyoshi, A.: "Study of occlusal contact pattern on molar region during fifth phase of gum chewing stroke"J Jpn Prosthodont Soc. 46 Special Issue (in press). (2002)

Miyoshi, A.：“口香糖咀嚼中风第五阶段磨牙区域咬合接触模式的研究”Jpn Prosthodont Soc。

三好礼子,中野雅徳 他: "咀嚼運動第4相における臼歯部の咬合関係"日本補綴歯科学会雑誌. 44・104回特別号. 68-68 (2000)

Reiko Miyoshi、Masanori Nakano 等：“咀嚼运动第四阶段中磨牙区域的咬合关系”，日本修复医学会杂志第 44 期/第 104 期特刊（2000 年）。

三好礼子: "咀嚼運動第4相における臼歯部の咬合関係"日本補綴歯科学会雑誌. 44・104回特別号. 68-68 (2000)

Reiko Miyoshi：“咀嚼运动第四阶段中磨牙区域的咬合关系”，日本修复医学会杂志第 44/104 期特刊（2000 年）。

Nakano, M.: "Introduction to Temporomandibular Disorders"Ishiyaku Publishers, INC.. 64-70(244) (2001)

Nakano, M.：“颞下颌疾病简介”Ishiyaku Publishers, INC.. 64-70(244) (2001)