牙体修复(2) (NXPowerLite)课件

Outline Form and Initial Depth Ⅰ
Definition:
placing the cavity margins in the positions they will occupy in the final preparation; preparing an initial depth of 0.2~0.8 mm pulpally of the dentinoenamel junction position or normal root surface position.
Initial cavity preparation stage
Step 1 Step 2 Step 3 Step 4 Outline form and initial depth Primary resistance form Primary retention form Convenience form
Indication of Operative Dentistry
Caries; Malformed, discolored, or fractured teeth; Restoration replacement.
Program of Operative Treatment
Patient assessment Examination and diagnosis Treatment planning Pain control: local anesthetic Isolation of the operating field
Initial cavity preparation stage
Step 1 Step 2 Step 3 Step 4 Outline form and initial depth Primary resistance form Primary retention form Convenience form
Principles: without any exception
all friable and/or weakened enamel should be removed all faults should be included all margins should be placed in a position to afford good finishing of the margins of the restoration.
Caty
Classification of cavity
Class I Class II Class III Class IV Class V Class VI
—G.V.Black in 1908
Cavity
Final cavity preparation stage
Step 5 Removal of any remaining infected dentin if indicated Step 6 Pulp protection Step 7 Secondary resistance & retention form Step 8 Procedure for finishing external walls Step 9 Final procedures
Operative Dentistry 2
CHEN Zhi Wuhan University School of Stomatology
Definition of Operative Dentistry
Operative dentistry is the ART and SCIENCE of the diagnosis, treatment, prognosis of defects of teeth which do not require full coverage restorations for correction.
Cavity Preparation
The mechanical alteration of a defective, injured, or diseased tooth in order to best receive a restorative material which will re-establish a healthy state for the tooth including esthetic corrections where indicated, along with normal form and function.
Program of Operative Treatment
Cavity preparation Matrix application Preparation of materials Insertion and carving of materials Finishing and Polishing
Simple cavity: only one tooth surface is involved. Compound cavity: two surfaces are involved. Complex cavity: three or more surfaces are involved.
QUIZ TIME
Class 1 Class 6 Class 1 Class 4 Class 3
Class 2
Class 2
Class 5
Stages and Steps in Cavity Preparation
Initial cavity preparation stage Final cavity preparation stage
Maxillary Class Ⅰ outline form
Mandibular Class Ⅰ outline form
Maxillary Class Ⅱ outline form
Mandibular Class Ⅱ outline form
Common Error
Outline Form and Initial Depth Ⅱ