Angle, the key to normal occlusion in adults is the anteroposterior relationship between the upper and lower first molars.РAngle理想正常合?ideal normal occlusionР保存全部牙齿Р牙齿在上下牙弓中排列整齐Р上下牙齿的尖窝关系完全正确Р上下牙弓的合关系非常理想РIn normal occlusion, the al cusp of the upper?first molar is received in the sulcus between the mesial?and distal al cusps of the lower [first molar]. The?mesial and distal inclines of the al cusp of the?upper first molar are received between the mesial and?distal al cusps of the lower first molar.Р个别正常合?Ideal normal occlusionР 凡是轻微的错合畸形,对于生理过程无大防碍者,都可列入正常合范畴。这种正常范畴内的个体合,彼此之间又有所不同,故称之为个别正常合。Р 个别正常合不以机械的形态为标准判断合,而强调以功能标准为主。个别正常合实际上就是生理合。Рclass I , neutroclusion? class II, distoclusion? class III, mesioclusionРAngle错合分类法Р上颌第一磨牙是合的关键?错合畸形是由下颌、下牙弓在近远中向的错位引起Р第一类错合——中性错合? Class I , neutroclusion
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