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Difference between primary and permanent dentition
This document compares the anatomical, morphological, histological, and applied aspects of primary and permanent teeth. It outlines key differences between primary and permanent teeth, including their duration, number, enamel thickness, occlusal plane, cusps, roots, pulp chamber, dentin, and periodontal ligament structures. The morphological and histological differences between primary and permanent teeth have important applications in procedures like cavity preparation, extraction, endodontic treatment, and pulp therapy.
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Difference between primary and permanent dentition
- 1. DR J RSWAIN IDS
- 2. OBJECTIVES INTRODUCTION ANATOMICAL FEATURES MORPHOLOGICAL FEATURES HISTOLOGICALFEATURES APPLIED ASPECTS ----------
- 3. INTRODUCTION The humandentition are usually categorized as being primary and permanent dentition . The primary dentition is first set of teeth and also called deciduous teeth, Baby teeth, temporary teeth, milk teeth . Primary teeth start to form during the embryo phase of pregnancy that is from 6th week of intra uterine life . The permanent dentition are the second set of teeth and also known as adult teeth . The first permanent tooth usually appears in mouth at around six years of age .
- 4. MORPHOLOGICAL FEATURES PRIMARY TOOTHPERMANENT TOOTH DURATION :- 6 month – 51/2 year NUMBER :- 20 (2 incisors, 1 canine, 2 molars) ENAMEL :- thinner(about 1 mm) OCCLUSAL PLANE :- relatively flat MAMMELEONS :- absent DURATION :- 61/2 year onward NUMBER :- 32 (2 incisors, 1 canine 2 premolars, 3 molars) ENAMEL :- thicker (about 2-3 mm) OCCLUSAL PLANE :- more curved contour MAMMELEONS ;- present
- 5. THE CROWN PRIMARY TOOTHPERMANENTY TOOTH CUSPS:- 1ST upper molar – 3 2nd upper molar – 4 1st lower molar – 4 2nd lower molar – 5 CUSPIDS :- slender and tends to be more conical SUPPLEMENTAL GROOVES:- more CUSPS:- 1st upper molar – 4 2nd upper molar – 4 1st lower molar – 5 2nd lower molar - 4 CUSPIDS:- less conical SUPPLEMENTAL GROOVES:- less
- 7. PRIMARY TOOTH PERMANENTTOOTH SHAPE:- larger and more slender ROOT TRUNK :- smaller WIDTH :- narrower mesiodistally PHYSIOLOGICAL RESORPTION :- during shedding of life SHAPE :- shorter and bulbous ROOT TRUNK :- larger WIDTH :- broader mesiodistally PHYSIOLOGICAL RESORPTION :- absent THE ROOT
- 9. THE PULP PRIMARY TOOTHPERMANENT TOOTH PULP CHAMBER :- larger ROOT CANAL :- more ribbon like (hour glass appearance) ACCESSORY CANAL :- present (towards furcation area ) VASCULARITY :- high PULP HORN :- more prominent and closer to the outer surface PULP CHAMBER :- smaller ROOT CANAL :- well defined ACCESSORY CANAL :- present (towards apical portion) VASCULARITY :- low PULP HORN :- flattend and not closer to the outer surface
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- 11. HISTOLOGICAL FEATURES PRIMARY TOOTHPERMANENT TOOTH BLOOD SUPPLY :- enlarged apical foramen so abundant blood supply REPARATIVE DENTIN :- more LOCALISATION OF INFECTION:- poorer BLOOD SUPPLY :- restricted and reduced blood supply REPARATIVE DENTIN :- less LOCALISATION OF INFECTION :- better
- 12. DENTIN PRIMARY TOOTH PERMANENTTOOTH DENTINAL TUBULES :- less regular DENTIN FORMING CELLS:- functionally active by 360 days INTERGLOBULAR DENTIN:- absent DENTIN :- usually less dentin DENTINAL TUBULES :- more regular DENTIN FORMIG CELLS:- functionally active by 700 days INTERGLOBULAR DENTIN:- present DENTIN :- more dentin
- 13. ENAMEL PRIMARY TOOTH PRIMARYTOOTH BANDS OF RETIZUS :- less common BANDS OF RETIZUS :- more common
- 14. MINERAL CONTENT PRIMARY TOOTHPERMANENT TOOTH ENAMEL :- less mineralised DENTIN :- less mineralised NEONATAL LINE :- present ENAMEL :- more mineralised DENTIN :- more mineralised NEONATAL LINE :- only seen in permanent molar
- 15. PERIODONTAL LIGAMENT PRIMARY TOOTHPERMANENT TOOTH SECONDARY CEMENTUM:- absent ALVEOLAR ATROPHY :- rare GINGIVITIS :- generally absent in healthy child similarly recession infrequent SECONDARY CEMENTUM:- present ALVEOLAR ATROPHY:- occurs GINGIVITIS :- common in adult
- 16. APPLIED ASPECTS CROWN:- Morphological features of primary and permanent helps us for cavity preparation in both primary and permanent tooth(as enamel thickness is less in primary and enamel is delicate, there is a restriction in cutting efficiency) . THE ROOT :- Morphological features of primary and permanent tooth helps in extraction (as primary tooth root is short, physiolo0gical resorption occurs, so during extraction care should be taken) Root length, root trunk and shape of root helps during endodontic treatment.
- 17. Size, shape,color, mammelons and number of tooth are helps in identification of tooth . CONTACT AREA :- as contact area is broad in primary tooth, so its more prone to carries . PULP CHAMBER:- Structures of pulp chamber is used for pulp therapy ACCESSORY CANAL:- In primary tooth accessory canals found near furcation area, so infections mainly seen near furcation area . But in permanent teeth furcation present toward apex, so infection occours in root apex . DENTIN :-as dentin is more dense in permanent tooth, its difficult to cut during cavity preparation .