Have short extension towards the DEJ;
HISTOLOGY termed TOMES PROCESSES
1. ENAMEL
Formed by cells called ameloblasts, originate from the embryonic layer known ectoderm
The building structures or blocks of enamel are called enamel rods. (also to determine how crack-
resistant the enamel is)
Connected to each other that they appear
like KEYHOLES or paddle shaped
IMPORTANT ENAMEL STRUCTURE
a) Gnarled enamel – are entwined rods with adjacent groups of rods, which follows a curving irregular path toward
the tooth surface. This can be found in cervical region, incisal and occlusal areas.
b) Hunter-Schreger Bands - These bands appear to be composed of alternate light and dark zones of varying widths
that have slightly different permeability and organic content. These bands are found in different areas of each
class of teeth.
HISTOLOGICAL FEATURES OF ENAMEL
a) Enamel tufts- hypomineralized structures of enamel rods and inter-rod substance that project between adjacent
groups of enamel rods from the DEJ.
b) Enamel Lamellae - are thin leaf-like faults between enamel rod groups that extend from the enamel surface to
DEJ sometimes into the dentin.
c) Enamel spindles - originate from the DEJ, may serve as pain receptors, explaining the enamel sensitivity
experienced by some patients during tooth preparation.
DENTINO ENAMEL JUNCTION
The interface of the enamel and dentin.
It is scalloped or wavy in outline, with the crest of the waves penetrating toward the enamel.
2. PULP
Contains nerves, arterioles, venules, capillaries, lymph channels, connective tissue cells, intercellular
substance, odontoblasts, fibroblasts, macrophages, collagen, and fine fibers.
Circumscribed peripherally by a specialized odontogenic area composed of the odontoblasts, the cell-
free zone, and the cell-rich zone.
3. DENTIN
Dentin is formed by cells called odontoblasts.
Because of these odontoblastic cell processes, dentin is considered a living tissue, with the capability of
reacting to physiologic and pathologic stimuli.
Considered part of dentin and pulp tissues
because their cell bodies are in the pulp cavity
PRIMARY DENTIN - is the dentin forming the initial shape of the tooth
SECONDARY DENTIN - is characterized by a slower rate of deposition and an abrupt change in the direction of the
dentinal tubules
HISTOLOGY termed TOMES PROCESSES
1. ENAMEL
Formed by cells called ameloblasts, originate from the embryonic layer known ectoderm
The building structures or blocks of enamel are called enamel rods. (also to determine how crack-
resistant the enamel is)
Connected to each other that they appear
like KEYHOLES or paddle shaped
IMPORTANT ENAMEL STRUCTURE
a) Gnarled enamel – are entwined rods with adjacent groups of rods, which follows a curving irregular path toward
the tooth surface. This can be found in cervical region, incisal and occlusal areas.
b) Hunter-Schreger Bands - These bands appear to be composed of alternate light and dark zones of varying widths
that have slightly different permeability and organic content. These bands are found in different areas of each
class of teeth.
HISTOLOGICAL FEATURES OF ENAMEL
a) Enamel tufts- hypomineralized structures of enamel rods and inter-rod substance that project between adjacent
groups of enamel rods from the DEJ.
b) Enamel Lamellae - are thin leaf-like faults between enamel rod groups that extend from the enamel surface to
DEJ sometimes into the dentin.
c) Enamel spindles - originate from the DEJ, may serve as pain receptors, explaining the enamel sensitivity
experienced by some patients during tooth preparation.
DENTINO ENAMEL JUNCTION
The interface of the enamel and dentin.
It is scalloped or wavy in outline, with the crest of the waves penetrating toward the enamel.
2. PULP
Contains nerves, arterioles, venules, capillaries, lymph channels, connective tissue cells, intercellular
substance, odontoblasts, fibroblasts, macrophages, collagen, and fine fibers.
Circumscribed peripherally by a specialized odontogenic area composed of the odontoblasts, the cell-
free zone, and the cell-rich zone.
3. DENTIN
Dentin is formed by cells called odontoblasts.
Because of these odontoblastic cell processes, dentin is considered a living tissue, with the capability of
reacting to physiologic and pathologic stimuli.
Considered part of dentin and pulp tissues
because their cell bodies are in the pulp cavity
PRIMARY DENTIN - is the dentin forming the initial shape of the tooth
SECONDARY DENTIN - is characterized by a slower rate of deposition and an abrupt change in the direction of the
dentinal tubules
