少东子 1901 SHANDONG UNIVERSITY 第三节牙的萌出和替换 Designed and produced by Dr Wang Li
第三节 牙的萌出和替换 Designed and produced by Dr. Wang Li 1
、牙的荫出 概念: eruption指牙突破口腔黏膜的现象 分期: ■萌出前期 ■萌出期 萌出后期 Designed and produced by Dr. Wang Li
一、牙的萌出 概念：eruption 指牙突破口腔黏膜的现象 分期： 萌出前期 萌 出 期 萌出后期 Designed and produced by Dr. Wang Li 2
牙的萌出 1萌出前期: 牙根形成时牙胚在牙槽骨中的移动 随颌骨的生长,乳牙胚向前庭方向和咬合面移动, 恒牙胚在乳牙舌侧发育。恒磨牙随颌骨的生长改 变位置 牙胚萌出前移动的方式: 整体移动 部分固定,其他部分生长:如上皮隔 Designed and produced by Dr. Wang Li
牙的萌出 1.萌出前期： 牙根形成时牙胚在牙槽骨中的移动 随颌骨的生长，乳牙胚向前庭方向和咬合面移动， 恒牙胚在乳牙舌侧发育。恒磨牙随颌骨的生长改 变位置 牙胚萌出前移动的方式： 整体移动 一部分固定，其他部分生长：如上皮隔 Designed and produced by Dr. Wang Li 3
牙的萌出 b Designed and produced by Dr Wang Li
牙的萌出 Designed and produced by Dr. Wang Li 4
牙的萌出 2.萌出期: 缩余釉上皮的保护上皮袖引导索 s F 等垂 5∴. 幼儿上腭的乳牙舌侧可见恒牙萌出的引导管 Designed and produced by Dr Wang Li
2.萌出期： 缩余釉上皮的保护 上皮袖 引导索 Designed and produced by Dr. Wang Li 5 牙的萌出 幼儿上腭的乳牙舌侧可见恒牙萌出的引导管
牙的萌出 2.萌出期: 缩余釉上皮的保护上皮袖引导索 主动萌出-牙颌向运动 被动萌出-牙龈的根方移动 结合上皮 牙尖进入口腔后,牙根的一半或3/4都已形 成 Designed and produced by Dr. Wang Li
2.萌出期： 缩余釉上皮的保护 上皮袖 引导索 主动萌出-牙颌向运动 被动萌出-牙龈的根方移动 结合上皮 牙尖进入口腔后，牙根的一半或3/4都已形 成。 Designed and produced by Dr. Wang Li 6 牙的萌出
牙的萌出 萌出期: A C B Designed and produced by Dr Wang Li
牙的萌出 萌出期： Designed and produced by Dr. Wang Li 7
牙的萌出 ■牙的萌出: 萌出过程: Designed and produced by Dr Wang Li
牙的萌出 牙的萌出： 萌出过程： Designed and produced by Dr. Wang Li 8
牙的萌出 3.萌出后期(功能性萌出期 改建:牙咬合建立后,牙槽骨密度增加、牙周 膜主纤维束形成 根尖孔由喇叭口状一狭窄 生中牙颌面不断磨损-牙轻微颌向、侧向移 动补偿 Designed and produced by Dr. Wang Li
牙的萌出 3. 萌出后期（功能性萌出期） 改建：牙咬合建立后，牙槽骨密度增加、牙周 膜主纤维束形成 根尖孔由喇叭口状----狭窄 一生中牙颌面不断磨损-牙轻微颌向、侧向移 动补偿 Designed and produced by Dr. Wang Li 9
牙的萌出 萌出过程 B A C A. Enamel organ: B. Dental lamina: C. Basal bone Designed and produced by Dr. Wang Li
牙的萌出 萌出过程 Designed and produced by Dr. Wang Li A, Enamel organ; B, Dental lamina; C, Basal bone 10