[siˈmentəm]
［拉］〔NA〕牙骨质：覆盖牙根的骨样结缔组织，从牙骨质釉质界至根尖，衬入根管尖部，又是牙周韧带的附着结构，因而有助于支持牙齿；细胞间质钙化，排列成层
习惯用语acellular cementum
无细胞牙骨质：无细胞成分的牙骨质，覆盖牙骨质釉质交界处牙根的1／3至1／2，通常与一层含细胞牙骨质并列afibrillar cementum
无原纤维牙骨质：一层含酸性粘多糖并可能含无原纤维性胶原的牙骨质，有时扩展到牙骨质釉质交界处的牙釉质cellular cementum
细胞牙骨质：牙根顶尖1／2至2／3的骨质，含有包埋在钙化基质中的牙骨质细胞；它常附加有一层无细胞牙骨质uncalcified cementum
未钙化牙骨质：同cementoid- pyrophobia
- pyrophosphatase
- pyrophosphate
- pyrophosphokinase
- pyrophosphoric acid
- pyrophosphotransferase
- Pyroplasma
- pyropuncture
- pyroscope
- pyrosis
- Pyrosoma
- pyrotic
- pyrotoxin
- pyrovalerone hydrochloride
- pyroxamine maleate
- pyroxylin
- pyrrobutamine phosphate
- pyrrocaine
- pyrroetioporphyrin
- pyrrole
- pyrrolidine
- pyrroline
- pyrroline-5-carboxylate reductase
- pyrrolnitrin
- pyrroloporphyria