象牙質(粵拼:zoeng6 ngaa4 zat1,英文:dentin),又叫牙本質(粵拼:ngaa4 bun2 zat1),係喺琺瑯質同牙髓之間嗰層嘅微黃色組織,佢由70%嘅無機物(主要係鈣同磷)、20%嘅有機物同10%嘅水組成。
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