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
Showing posts from April, 2020
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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 .
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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.