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「口腔健康」口腔基礎知識同結構

Posted By vickong pun     December 1, 2020    

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你熟悉口腔基礎知識同結構咩?喺人嘅一生中,有乳牙與恆牙二副牙齒先後交替萌出。乳牙系20顆,上下各10顆。恆牙有28—32顆,上下牙各14—16顆。 牙齒嘅結構圖  牙齒從外部形態上觀察,每個牙齒都分為牙冠、牙根兩部分。
口腔基礎知識 面、脷面、近中面和遠中面,後牙嘅牙冠有頰面、脷面、近中面、遠中面和牙合面。 牙根:牙根系牙齒固定喺牙槽窩內嘅部分,也系牙齒嘅支持部分,其形態與數目隨着功能而有所唔同。功能較弱而單純嘅牙齒多為單根;功能較強而復雜嘅牙齒,牙冠外形也比較復雜,其牙根多分叉為兩個以上,以增強牙齒喺頜骨內嘅穩固性。 牙釉質:牙釉位於牙冠表層,半透明嘅乳白色硬組織,系牙體組織中高度鈣化嘅最堅硬嘅組織,牙釉質中96%為無機物,其余為水和有機物。 牙本質:牙本質系構成牙齒主體嘅物質,位於牙釉質和牙骨質嘅內層,不如牙釉質堅硬。其所含礦物質約莫系65%~70%,其余系有機物,而且主要系蛋白質和水。 牙骨質:牙骨質系構成牙根表層嘅鈣化組織。其硬度與身體其佢骨組織一樣。 牙髓:位於牙齒內部牙髓腔中嘅疏松結締組織,牙髓中含神經纖維、血管、淋巴管、造牙本質細胞和成纖維細胞。


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