STENCILDENT

GYPSUM PRODUCTS   DENTAL MATERIALS Gypsum was found in mines around city of Paris so its called plaster of Paris. ADA SPECIFICATION NUMBER: 25 Gypsum is classified into 5 types : Type1: Dental plaster for impression Type2: Dental plaster ,class 1- mounting,class 2-for moulds Type3: Dental stone for model Type4: Dental stone -high strength and low expansion Type5: Dental stone - high strength and high expansion  1 MOLE=    6.02214076×10 23 . Gaughing water: Excess water mixed with plaster ,makes manipulation quite easier . mechanism of setting in gypsum is explained through 3 theories out of which dissolution precipitation theory is widely accepted.                                    Advantage: 1)record fine details with least pressure 2)dimensional changes very minimal  3) economical Disadvantage: 1)gag reflex 2)cannot be used in undercut regions  Thanks for reading kindly comment down ur suggestion below 

  VIRUS STRUCTURE AND CLASSIFICATION Virus are obligate intercellular  organism sub microscopic entity consisting of a single nucleic acid surrounded by a protein coat and capable of replication only within the living cells  STRUCTURE: size: 10-100 nm; 1/10th size of bacterium . shape : spherical genome material : DNA OR RNA; never both  protective shell:    capsid : Its made of any identical protein subunit they protect gentic material ,symmetrically organised. Envelope :  lipid containing membrane that surrounds the virus particle located outside the capsid acquired during replication . CLASSIFICATION OF VIRUS: A) BASED ON MORPHOLOGY B) CHEMICAL COMPOSITION C)      MODE OF REPLICATION THANKS FOR READING  NOTE:please feel free to comment down your valuable suggestion below .

                      STAGES AND STEPS IN                                        TOOTH  PREPARATION                 TOOTH PREPARATION INVOLVES 2 STAGES  1) INITIAL TOOTH PREPARATION:    OUTLINE FORM AND INITIAL DEPTH PRIMARY RESISTANCE FORM  PRIMARY RETENTION FORM CONVENIENCE FORM 2) FINAL TOOTH PREPARATION  REMOVAL OF REMAINING CARIES PULP PROTECTION SECONDARY RESISTANCE AND RETENTION FORM FINISHING OF EXTERNAL WALL FINAL PROCEDURE OF CLEANING AND INSPECTING  Each stage and step is explained in detail please refer to above notes . note:please do not  download and share all rights are reserved to stencildent.