352口腔刻錄課件修復(fù)設(shè)計(jì)

1、Removable Partial DentureModel designing 模型設(shè)計(jì)魏 斌What Is the Model Designing ?Clinical steps (complaint, history,examination)Laboratory steps -Model designingSystem DesignFor Dentures復(fù)習(xí)義齒修復(fù)的全過程了解”模型設(shè)計(jì)”的所處的位置及重要性ProcedureStudy castSurveyor1. Surveying2. To choose the insert-path3. Final designing模型觀測選

2、擇就位道義齒的最后設(shè)計(jì)研究模觀測儀1. surveyingWith the help of the surveyorObservation,measurement and markingAccording to it, to choose The path of insertion its the aim of the surveyingSurveying rodcast working plateSurveyorAnalysing rodGraphite markerUndercut gaugeTrimming knifeSurveying rod Several kinds of rods

3、Analysing rod1. To find and identify the undercut （倒凹） 2. To determine the parallelism of the surfacesGraphite markerTo identify and markthe position of maximum convexitySURVEY LINE (觀測線)review?ChangeableUndercut and non-undercutUndercut gauge （倒凹計(jì)）1. To measure the extent of horizontal undercut2. A

4、djusting the vertical position of the gauge until the head contact the surface of the teeth 3. Following sizes are available : 0.25, 0.5,0.75(mm)position of The retentive clasp type and material of the clasp 0.75trimming knifeTo eliminate unwanted undercuts wax is added The excess is removed A dupli

5、cate cast is made2. Path of Insertion Why should we choose the Path of Insertion? How to choose the Path of Insertion? Why should we choose the Path of Insertion? AppearanceInterferenceRetentionAppearanceInsert verticallyInsert forwardInterferenceInsert verticallyInsert forwardRetentionPath of inser

6、tion (1)Path of displacement(2)Path of withdraw (3) The angleOcclusal plane3 How to choose the Path of Insertion?Working plate To tilt the working plate and castChange the angle between the analysing rod and the occlusal planeRelationship between the rod and castRod= the path of insertionAppearanceE

7、xample 1?Tiled casts前傾后傾左側(cè)傾斜右側(cè)傾斜前后左右Example 2Average 將缺牙區(qū)前后基牙鄰面的倒凹或左右兩側(cè)基牙舌側(cè)的倒凹進(jìn)行平均分配。適用于基牙傾斜扭轉(zhuǎn)，倒凹明顯者。使用均凹法后可避免一側(cè)倒凹過大，方便義齒就位。角平分線Example 3調(diào)凹法： 是根據(jù)義齒固位的需要，有意識(shí)地將模型向近遠(yuǎn)中或左右向傾斜，使倒凹集中在某一側(cè)以增強(qiáng)固位。適用于基牙倒凹不大，無明顯傾斜移位者。Example 43. Final surveyDifferent survey lineDifferent clasp design (include the kind,position,

8、and etc.)3.最后設(shè)計(jì)（final survey) 根據(jù)模型設(shè)計(jì),結(jié)合臨床檢查,確定就位道方向.根據(jù)所確定的就位道畫出基牙觀測線.確定使用的固位體類型及安放的位置.確定間接固位體、大小連接體、支架的位置及基托伸展的范圍。填倒凹設(shè)計(jì)方案確定后，即可明確基牙和軟組織倒凹的位置和大小。目的：方便義齒的取戴，同時(shí)避免過大的縫隙。方法：人造石填補(bǔ)，運(yùn)用帶刃的觀測桿修整石膏。 確定頜位關(guān)系及上合架 頜位記錄的三種方法P235 頜位記錄的方法頜位記錄（recording jaw relationship)目的：將上下頜間正確的咬合關(guān)系轉(zhuǎn)移到合架上，為義齒制作提供依據(jù)，具有非常重要的作用。 方法 余留牙確定法蠟合記錄法合堤記錄法1.余留牙確定法適用：缺牙少，上下頜模型對(duì)合好臨床操作6 缺失右側(cè)位左側(cè)位2.蠟合記錄法適用：口腔內(nèi)有咬合關(guān)系，而模型上咬合關(guān)系不穩(wěn)定（余留牙體磨耗、缺損、傾斜、移位，造成上下頜牙對(duì)應(yīng)鎖結(jié)關(guān)系不明顯 ）蠟合(2-3層蠟片,寬約1cm)臨床操作3. 合堤記錄法 最常用的測合方法適用：模型上咬合不穩(wěn)定，或喪失正確咬合 關(guān)系患者. a 多數(shù)牙缺失,僅有個(gè)別牙上下對(duì)應(yīng) b 末端游離缺失,大部分前牙缺失 c 上下頜無對(duì)應(yīng)牙或單頜缺失 d 錯(cuò)誤的咬合關(guān)系，如偏頜、垂直距離降低 （磨耗、后牙缺失）合堤(occl