咬合是口颌系统的重要功能结构，是完成口腔功能的重要组成部分。
Occlusion is one of the important parts of the mouth-jaw system and is the important constituent to complete the oral function.
牙齿是咬合支持系统的重要组成部分，牙齿的缺失尤其是多数牙齿的缺失必然导致咬合支持状态的改变。
Tooth is the important constituent of the occlusal support system and tooth missing may cause the occlusal support function subsiding or losing.
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