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difference between primary and secondary tooth

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  • 1. Presented by :- Samson S. Samuel 1st year Guided by:- Dr. Fatima Saify Dr. Nidhi Sharma Dr. Kedarnath
  • 2. Introduction - Teeth : * Hard structure * Cutting and chewing food * Embedded in socket * Attached by periodontal ligament
  • 3. CONDENSED : DENTIN - * Hard tissue elastic in nature * Covered by enamel in the crown and by the cementum in Root . ENAMEL - * Hardest tissue * Acellular * Shape and contour to the crown Pulp – * Vascular mesenchymal connective tissue * center of the tooth within rigid dentinal walls
  • 4. PARTS : Crown - Above cervical line of tooth Root - Below cervical line
  • 5. FEATURES DECIDUOUD TEETH PERMANENT TEETH 1. Duration 6 MONTH to 5 ½ years 6 ½ years on wards 2. NUMBER 20 { 2 incisor, 1 canine , 2 molars } 32 { 2 incisor, 1 canine , 2 primolars, 3 molars} 3.ENAMEL Thinner ( About 1 mm ) Thicker ( About 2-3 mm) 4. OCCLUSAL PLANE Relatively flat More Curved contour 5. MAMMELEONS Absent Present MORPHOLOGICAL FEATURES CROWN
  • 6. THE ROOT FEATURES DECIDUOUS TEETH PERMANENT TEETH 1. SHAPE Larger and more slender Shorter and bulbous 2. ROOT TRUNK Smaller Larger 3. WIDTH Narrower mesiodistally Broader mesiodistally 4. PHYSIOLOGICAL RESORPTION During shedding of tooth Absent
  • 7. THE PULP FEATURES DECIDUOUS TEETH PERMANENT TEETH 1.PULP CHAMBER LARGER SMALLER 2.ROOT CANALS MORE RIBBON LIKE [HOUR GLASS APPEORANCE] WELL DEFINED WITH LESS BRANCHING 3.ACCESSORY CANLS PRESENT MAY BE ABSENT 4.CELLUARITY AND VASCULARITY HIGH DEGREE LESS DEGREE 5.POTENTIAL HIGH POTENTIAL LOW POTENTIAL
  • 8. HISTOLOGIC DIFFERENCE FEATURE S DECIDUOUS TEETH PERMANENT TEETH 1.BLOOD SUPPLY Enlarged apical foramens. The abundent blood supply Restricted, Reduced blood supply 2.REPARATIVE DENTIN More Less 3.DENSITY OF INERVATION Less More 4.LOCALIZATION OF INFECTION poorer Better
  • 9. FEATURES DECIDOUS TEETH PERMANENT TEETH 1.DENTINAL TUBULES Less regular Most regular 2.DENTIN FORMING CELLS Functionally active by approximately 360 days Functionally active by 700 days 3.INTER GLOBULAR DENTIN Absent Present 4.DENTIN Usually less dense Difficult to cut DENTINE
  • 10. FEATURES DECIDOUS TEETH PERMANENT TEETH 1.ENAMEL AND DENTINE Less mineralized More mineralized 2.NEONTAL LINES present Only seen in first Permanent molar MINERAL CONTENT FEATURES DECIDOUS TEETH PERMANENT TEETH 1.BANDS OF RETZIUS Less common More common ENAMEL
  • 11. FEATURES DECIDOUS TEETH PERMANENT TEETH 1.SECONDARY CEMENTUM Characteristically absent Present 2.ALVEOLAR ATROPY Rare occurs 3.GINGIVITIS Generally absent in healthy child similarly recession is infrequent Common in adult PERIODONTAL LIGAMENT
  • 12. REFERENCE :: 1. TEXTBOOK FOR PEDODONTICS BY SHOBHA TANDON 2. PRINCIPLES AND PRACTICE OF PEDODONTICS BY ARATHI RAO 3. WHEELER’S DENTAL ANATOMY PHYSIOLOGY AND OCCLUSION 4. TEXTBOOK OF DENTAL AND ORAL HISTOLOGY WITH EMBRYOLOGY BY SATISH CHANDRA 5. A.T. BIVI JI