DENTAL ANATOMY - PowerPoint PPT Presentation

Loading...

PPT – DENTAL ANATOMY PowerPoint presentation | free to download - id: 42a9eb-YTU1M



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

DENTAL ANATOMY

Description:

DENTAL ANATOMY FOR THE ENT RESIDENT Hedyeh Javidnia, PGY2 November 7, 2008 ... Anatomical crown Clinical crown Dental Anatomy c. Root (1) ... – PowerPoint PPT presentation

Number of Views:603
Avg rating:3.0/5.0
Slides: 45
Provided by: Facultyof67
Learn more at: http://www.medicine.uottawa.ca
Category:
Tags: anatomy | dental | anatomy | root

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: DENTAL ANATOMY


1

DENTAL ANATOMY FOR THE ENT RESIDENT
Hedyeh Javidnia, PGY2 November 7, 2008
2
Objectives
  • Dental Anatomy
  • Odontogenesis
  • Types of Dentition
  • Tooth Surfaces
  • Mandibular Maxillary Anatomy

3
Dental Anatomy
Anatomy of a tooth. a. Anatomical crown-
portion of tooth covered with enamel
4
Dental Anatomy
b. Clinical crown- visible part of tooth above
the gum line.
Anatomical crown
Clinical crown
5
Dental Anatomy
c. Root (1) Part of tooth embedded in the
alveolar process and covered by cementum.
6
Dental Anatomy
  • d. Apex- tapered end of root tip.
  • e. Apical foramen-opening at the root tip.

7
Dental Anatomy
  • Tissues of the tooth.
  • a. Enamel
  • Makes up anatomic crown.
  • Hardest material in the human body
  • Incapable of remodeling and repair.

8
(No Transcript)
9
Dental Anatomy
b. Dentin (1) Makes up bulk of tooth.
(2) Covered by enamel on crown and cementum on
the root. (3) Not as hard as enamel. (4)
Exposed dentin is often sensitive to cold,
hot, air, and touch (via dentinal tubules).
10
(No Transcript)
11
Dental Anatomy
c. Cementum (1) Covers root of tooth. (2)
Overlies the dentin and joins the enamel at the
cemento-enamel junction (CEJ). (3) Primary
function is to anchor the tooth to the bony
socket with attachment fibers.

12
(No Transcript)
13
Dental Anatomy
d. Pulp (1) Made up of blood vessels
and nerves entering through the apical
foramen. (2) Contains connective tissue,
which aids interchange between pulp and
dentin.
14
(No Transcript)
15
Dental Anatomy
  • 4. Periodontium
  • a. Alveolar process.
  • (1) Bone extensions of the maxillae and
    mandible that supports the teeth.
  • (2) Cortical plate is the dense outer layer
    of bone covering the spongy (cancellous) bone

16
(No Transcript)
17
Dental Anatomy
  • b. Periodontal ligaments.
  • Dense connective fibrous tissues that connect
    teeth to the alveolar bone.
  • One end is embedded in cementum and other end in
    bone.
  • Supports and protects the tooth from normal
    shock.

18
(No Transcript)
19
Dental Anatomy
c. Gingiva - surrounds the teeth and covers the
alveolar process.
20
(No Transcript)
21
Odontogenesis
  • Bud Stage
  • Cap Stage
  • Bell Stage
  • D and E. Dentinogenesis and
  • amelogenesis
  • Crown formation
  • Root Formation
  • Eruption

22
A. Bud Stage
Intramembranous ossification
Meckels cartilage
  • Bud stage is characterized by rounded, localized
    growth of epithelium surrounded by proliferating
    mesenchymal cells, which are packed closely
    beneath and around the epithelial buds

23
B. Cap Stage
Vestibular lamina
When the appropriate depth is reached, the basal
layer at the tip of the dental lamina thickens,
forming a concavity.
24
C. Bell Stage
Dental lamina
Outer dental epithelium
Inner dental epithelium
Dental papilla
Dental follicle
Cervical loop
  • Continued growth leads to bell stage, where the
    enamel organ resembles a
  • bell with deepening of the epithelium over the
    dental papilla
  • Continuation of histodifferentiation (Inner
    dental epithelium - ameloblasts and
  • Dental papilla - odontoblasts)

25
D. Amelogenesis
Ameloblasts
First layer of enamel
Dentin
Odontoblasts
At the same time or soon after the first layer of
dentin (mantle dentin) is formed, the inner
dental epithelial cells differentiate into
ameloblasts and secrete enamel proteins. The
ameloblasts will then start laying down organic
matrix of enamel against the newly formed
dentinal surface. The enamel matrix
will mineralize immediately and form the first
layer of enamel. The formation of enamel is
called amelogenesis.
26
E. Dentinogenesis
Dentin is formed by odontoblasts that
differentiate from ectomesenchymal cells of
dental papilla with influence from the inner
dental epithelium Differentiation of
odontoblasts is mediated by expression of
signaling molecules and growth factors in the
inner dental epithelial cells
27
F. Crown Formation Growth areas of developing
crown. Growth at cusp tip, intercuspal region,
and cervical region
Incremental pattern of dentin and enamel
formation from initiation to completion
28
G. Root Formation
Hertwigs epithelial root sheath
Development of root begins after the enamel and
dentin formation has reached the future
cementoenamel junction Epithelial cells of the
inner and outer dental epithelium proliferate
from the cervical loop of the enamel organ to
form the Hertwigs epithelial root sheath. The
root sheath determines if a tooth has single or
multiple roots, is short or long, or is curved ir
straight
29
Epithelial Cell Rests of Malassez
Inner dental epithelium
Outer dental epithelium
Hertwigs epithelial root sheath
Stratum intermedium
Eventually the root sheath will fragment to form
several discrete clusters of epithelial cells
known as epithelial cell rests of malassez.
These will persist in adults within the
periodontal ligament The epithelial rests appear
as small clusters of epithelial cells which are
located in the periodontal ligament adjacent to
the surface of cementum. They are cellular
residues of the embryonic structure known as
Hertwig's epithelial root sheath.
30
H. Tooth Eruption and Development of
supporting structures
  • Soon after root formation begins, tooth begins
    to erupt until it reaches its final position
  • While roots are forming, the supporting
    structures of tooth also develop periodontal
    ligament and cementum
  • As the root sheath fragments, the dental
    follicle cells will penetrate between the
    epithelial cells and lie close to the newly
    formed root dentin
  • These cells will differentiate into
    cementoblasts, which will make cementum

31
REVIEW Odontogenesis
  • Bud Stage
  • Cap Stage
  • Bell Stage
  • D and E. Dentinogenesis and
  • amelogenesis
  • Crown formation
  • Root Formation
  • Eruption

32
Types of Dentition
1. Deciduous (baby) teeth a. Twenty ( 20)
primary teeth. b. Arches - maxillary and
mandibular. c. Quadrants - each arch divided
in half. (1) Maxillary right and left.
(2) Mandibular right and left.
Enamel is thinner, pulp is thicker
33
Deciduous Teeth
  • d. Teeth in each quadrant.
  • (1) Central incisor
  • (2) Lateral incisor
  • (3) Cuspid
  • (4) 1st molar
  • (5) 2nd molar

34
Deciduous Teeth
f. Numbering system. (1) Alphabetical.
(2) Maxillary - patients right to left, A
through J. (3) Mandibular - patients
left to right, K thru T.
35
Types of Dentition
  • 2. Permanent teeth.
  • a. Thirty-two (32) permanent teeth.
  • b. Arches - maxillary




    mandibular.

36
Permanent Teeth
c. Quadrants. (1) Maxillary right and
left. (2) Mandibular right and left.
37
Permanent Teeth
  • Teeth in each quadrant.
  • (1) Central incisor.
  • (2) Lateral incisor.
  • (3) Cuspid (canine).

38
Permanent Teeth
  • (4) 1st bicuspid
  • (5) 2nd bicuspid
  • (6) 1st molar
  • (7) 2nd molar
  • (8) 3rd molar
  • (wisdom tooth)

39
Tooth Surfaces
  • 1. Facial - next to cheeks lips.
  • a. Labial- anterior facial.
  • b. Buccal - posterior facial.
  • Lingual- next to tongue.
  • Mesial - towards midline, an imaginary line
    between central incisors.
  • Distal- away from midline.
  • Incisal- cutting edge of anterior teeth.
  • Occlusal- chewing surface of the posterior teeth.

40
Tooth Surfaces
  • 7. Proximal surfaces - mesial




    or distal surface of a tooth




    lying next to another tooth.
  • 8. Interproximal space
  • (embrasure) - spaces between




    teeth, filled with hard and




    soft tissue (interdental papilla).

41
Tooth Surfaces
  • 9. Cusps- pronounced elevations on the occlusal
    surfaces of a tooth terminating in a conical or
    rounded surface.

42
Anatomy of the Mandible
43
Anatomy of the Maxilla
44
The End!!
About PowerShow.com