kennedyⅰ-ⅳ类牙列缺损ppt课件.pptVIP

Kennedy第三类牙列缺损 特点 (1)牙弓一侧或两侧有缺失牙 (2)缺牙间隙两侧均有天然牙存在 (3)多设计为牙支持式义齿 Kennedy第三类牙列缺损 设计要点 (1)缺牙间隙较小，而两端基牙条件较好时，在基牙上设计直接固位体即可。 Kennedy第三类牙列缺损 设计要点 (2)缺牙间隙大，缺隙在牙弓一侧，前方基牙又较弱者，可用大连接体，利用两侧牙弓支持，并在对侧使用有间接固位作用的卡环 Kennedy第三类牙列缺损 设计举例 Kennedy第四类牙列缺损 特点 (1)前牙缺失 (2)多设计为混合支持式义齿 Kennedy第四类牙列缺损 设计要点 (1)1个或2个前牙缺失, 常选择两个基牙,基牙 常为第一前磨牙 (2)人工牙排列要避免深覆合,要与相邻的天然牙协调,与牙弓对侧同名天然牙对称,颜色尽量与天然牙一致 Kennedy第四类牙列缺损 设计要点 (3)尖牙缺失,间隙小,合力不大的情况下,可在缺隙远中设置两个固位体,单侧设计义齿,使基托面积减小,便于发音 (4)前牙缺失较多者,要增加基牙数,防止义齿发生唇舌向转动 Kennedy第四类牙列缺损 设计要点 (5)唇侧牙槽嵴丰满者,可考虑不放唇侧基托,以利美观 (6)采用前斜方就位,使人工牙与天然牙间空隙减小,利于人工牙排列与美观 (7)深覆合的设计 ·轻度深覆合,可调磨下前牙,增加切龈距离 ·中,重度深覆合,腭侧采用铸造基托 ·下前牙咬及腭粘膜者,可作矫治性修复,但要注意进食时摘下义齿,并且定期复查 Kennedy Ⅰ-Ⅳ类牙列缺损的设计 研究生 潘领战 孟波 林川 指导老师 肖茂春教授 Kennedy Ⅰ-Ⅳ类牙列缺损的设计 活动义齿临床设计的思路 Kennedy Ⅰ-Ⅳ类牙列缺损的修复设计 Considerations for removable prostheses Decide which of the missing teeth are to be replaced and which saddles are to be restored Deciding on the nature of the support Deciding on the form of the major connector Deciding on how the prosthesis will be retained Planning for stability Review of design with hygiene and maintenance in mind Deciding which of themissing teeth are to be replaced and which saddlesare to be restored plan holistically “formulate a tentative denture design concurrent with the formulation of the treatment plan.” Deciding on the nature of thesupport ? Class I: Denture supported by mucosa and underlying bone Result in Displace mucosa further loss of alveolar bone ? Class II: Denture supported by teeth Help to maintain alveolar bone means ? Class III: Denture supported by a combination of mucosa and tooth-borne means. instability ? Class IV: Denture supported by implants Cingulum rests occlusal rests Incisor rests Over denture Deciding on the form of the majorconnector Maxillary common major connectors Palatal plate Palatal strap Anterior or posterior palatal bar Skeletal design Horseshoe design Labial bar Deciding on the form of the