STENCILDENT

 CONSERVATIVE DENTISTRY  Art and science of diagnosis,treatment,prognosis of defense of tooth that do not require full coverage restoration  Such treatment should result in proper tooth form, function ,esthetics ,in harmonious relationship with adjacent hard and soft tissue all of which enhance the general health and welfare of patient DENTAL CARIES: DEFINITION: Is an infectious microbiological disease that result in localized dissolution and destruction of the calcified tissue of teeth -STURDEVANT Is defined as the microbial disease of the calcified tissue of tooth characterized by demineralization of the inorganic protein and destruction of organic substance of tooth -E.A.M.KIDD BASED ON WHO SYSTEM: D1-Non cavitated lesion D2-Cavity limited to enamel  D3-cavity limited to dentin D4-cavity limited to pulp BLACKS CLASSIFICATION: CLASS I CARIES: All pits and fissure caries are class1 caries ,these caries include : Occlusal surface of premolar and molar Occlusal 2/3rd of facial and lingu

                  DENTIN BONDING AGENTS  1) FIRST GENERATION DENTIN BONDING AGENT: It consist of surface active co-monomer NPG-GMA  MECHANISM OF ACTION:  This co -monomer could chelate with calcium on tooth surface to generate chemical bond of resin to calcium  example: SS WHITE BURS,CREVIDIENT  It had poor strength ,hence when used in non-carious lesion without mechanical retention 2) SECOND GENERATION: They were based on phosphorous esters of methyl acrylate derivative  MECHANISM OF ACTION: Adhesion was by means of iconic interaction between the negatively charged phosphate groups and positively charged calcium smear layer ADVANTAGE: Bond strength was high  DISADVANTAGE: Due to bond instability in the net oral environment and there one degree bonding to the smear layer and not dentin  EXAMPLE: Clearfin bonding system 3) THIRD GENERATION: It was phosphate based material contain HEMA and 10  carbon molecule ,10-MDP MECHANISM OF ACTION: The concept of phosphoric acid etching of dentin b