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DENTAL ANATOMY 1st Semester 2008/2009 Academic Year Department of Stomatology

DENTAL ANATOMY 1st Semester 2008/2009 Academic Year Department of Stomatology School of Stomatology Wenzhou Medical College. Application of root and pulp morphology related to endodontic therapy. Kevin Yang Li Hong-qing. SECTION 1 Pulp Cavity Morphology. Objectives

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DENTAL ANATOMY 1st Semester 2008/2009 Academic Year Department of Stomatology

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  1. DENTAL ANATOMY 1st Semester 2008/2009 Academic Year Department of Stomatology School of Stomatology Wenzhou Medical College

  2. Application of root and pulp morphology related to endodontic therapy Kevin Yang Li Hong-qing

  3. SECTION 1 Pulp Cavity Morphology • Objectives • Four types of root canal • Normal shape and location of the pulp chamber • Number of pulp horns found within each type of secondary tooth

  4. A shape of pulp cavities and configuration of pulp canals • Pulp cavity • cavity in the central portion of the tooth • containing nevers and blood supply • Divided into two parts • Pulp chamber (more coronal) • root canals (in the roots)

  5. Pulp chamber and pulp horns • Pulp chamber • Most occlusal or incisal portion of the cavity • One tooth, one pulp chamber • Roof (for all teeth) • Floor (for multirooted teeth) • Pulp horns • Projections of chamber’s roof • Cusped tooth: One horn per functional cusp • Young incisors: 3

  6. Root canals (pulp canals) • Portions of pulp cavity located within the root • Canal orifice • Apical foramina • 4 types of canal configurations in one root • 1 • 2 • 3 • 4

  7. B shape of pulp cavities in sound young teeth • Pulp shape in anterior teeth • Chamber and horns • Canal(s) • Pulp shape in premolars • Chambers and horns • Canals and Orifices

  8. Pulp shape in molars • Chambers and horns • Canal(s) and orifices • Most common number of root and canals in adult teeth • Pulp shape in primary teeth • Cavity: large • Horns: high

  9. C Why pulp cavity get smaller in older teeth

  10. D Clinical application of pulp morphology related to restorative dentistry

  11. E Clinical application of pulp morphology related to endodontics • Endodontics defined • Diagnosis of pulpal and periapical disease • Endodontic therapy

  12. SECTION 2 Location of Root and Cervical Crown Concavities, Furcations, Depressions, and Canals • Objectives • The relationship of external root surface shape and internal pulp shape.

  13. A Maxillary central incisors • Cross section: Triangular mesial side longer than the distal side • No prominent root grooves • One root canal (nearly 100%)

  14. B Maxillary lateral incisors • Cross section: “Egg shaped” or ovoid • Mesial root surface: a shallow longitudinal root depression • One root canal (nearly 100%)

  15. C Mandibular central and lateral incisors • Cross section: Long ovoid • Proximal surfaces: Longitudinal root depression • One canal root (70% central, 55% lateral)

  16. D Maxillary canines • Cross section: broad labiolingually, appears ovoid • Proximal surfaces: developmental grooves • One root canal ( almost 100%)

  17. E Mandibular canines • Cross section: wide labiolingually • Proximal surface: depressions on both sides • One root canal (70%)

  18. F Maxillary first premolar • Two canal (90%) • Two roots (60%) • Proximal surfaces: depresssions on both sides, more deeper mesial side • Bifurcation: apical third to half of the root

  19. G Maxillary second premolars • One root (89%) • Proximal surfaces: both depressions, more deeper on distal • One root canal (59%)

  20. H Mandibular first premolar • Cross section: ovoid • Depressions: on both sides, deeper on the distal • One root canal (70%)

  21. I mandibular second premolars • Cross section: ovoid • Depressions on distal surface • One root canal (96%)

  22. J Mandibular first and second molars • 2 roots normally: mesial and distal • 3 canals: two mesial( nearly 100%), one distal (65%1st molar, 93%2nd molar) • Access to the bifurcations: mid root surface

  23. K maxillary first and second molar • 3 roots normally: mesiobuccal, distobuccal (shortest), lingual (longest) • 4 root canals: 2 in mesiobuccal root, 1 each in the other 2 roots. • Furcation: cervical third

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