Chapter 3: Tooth Origin and Formation Flashcards
Tooth arrangement
Dentition
Permanent teeth
Succedaneous
Scale off
Exfoliate
Dentition contains both deciduous and secondary teeth
Mixed dentition
Teeth of various shapes
Heterodont
Formation and origin of the tooth
Odontogenesis
First, or bud, stage of development; begins at the firth or sixth week in utero
Initiation
Membrane band containing organs of future teeth
Dental lamina
Mucous tissue covering and connective tissue layer
Epithelium
Second stage of development; reproduction of new parts; begins during the fourth or fifth month in utero
Proliferation
Third stage of development; acquiring different functions; causes changes in the tooth bud shape and makeup
Differentiation
Branching into different tissues
Histodifferentiation
Changing into a different shape
Morphodifferentiation
Fourth stage of development; maturation stage; mineral salts and organic matter are set in place for tooth formation
Apposition
Fifth phase in development; hardening and setting of tooth tissues
Calcification
Sixth stage of development; “cutting of the teeth”; tooth moves toward oral cavity and enters through tissues
Eruption
Final/seventh stage of development; wearing away occurs where teeth interact through mastication and speech
Attrition
Enamel organ; gibes the tooth its covering
Dental organ
Makes up the inner structures of the tooth, such as the dentin and pulp
Dental papilla
Makes up the surrounding covering for the dental organ and papilla
Dental sac
Outer layer of development
Ectoderm
Middle layer of tooth
Mesoderm
Connective tissue cells
Mesenchyme
First set/baby teeth
Deciduous teeth
Removal of hard tooth surface
Resorption
Cells that bring about absorption of primary tooth roots
Odontoclasts
Cells that destroy tooth cementum
Cementoclasts
Cells that destroy or cause absorption of bone tissue
Osteoclasts
Tooth irregularities or abnormalities
Anomalies
Tooth covering that is 96% inorganic
Enamel
Tissue layer covering the tooth surfaces that wears away soon after eruption; aka Nasmyth membrane
Cuticle
Lines in enamel
Lines/stripes/striae of Retzius
Developmental cracks of imperfections in enamel tissue extending toward or into the dentin
Lamellae
Irregular grouping of undercalcified enamel
Tuft
Tooth covering that is 96% inorganic
Enamel
Tissue layer covering the tooth surfaces that wears away soon after eruption; aka Nasmyth membrane
Cuticle
Lines in enamel
Lines/stripes/striae of Retzius
Developmental cracks of imperfections in enamel tissue extending toward or into the dentin
Lamellae
Irregular grouping of undercalcified enamel
Tuft
End areas of Union for odontoblasts and
enamel rod endings
Spindles
Slightly curved prism like structures that extend from the dentinoenamel junction to the outer surface; slightly packed with an organic matrix material to give a smooth, hard surface
Rods
Enamel rod twisting and curving within the tooth tissue
Gnarled enamel
The main tissue of tooth surrounding the pulp
Dentin
Small, s-shaped tubes or channels extending from the dentinoenamel wall to the pulp chamber; transmits pain stimuli and nutrition
Tubules
Ly within tubules and help the dentin to nourish and register sensation
Fibers
Soft, vascular tooth tissue
Pulp
Pointed edges or boundaries of the pulp chamber extending toward the surface
Pulp horns
Approximately 55% inorganic, rough in texture, and meets the enamel tissue at the neck of the tooth
Cementum
Cement-enamel union
Cementoenamel junction
Connective tissue fibers of the periodontal ligament
Sharpey’s fibers
Irregular cementum-forming cells
Cementocytes
Tiny cavities that may contain cementocytes
Lacuna
Small channels or canals in cementum
Canaliculi
Provides anchorage, support, and protection of the teeth
Periodontum
Membrane and fibers that anchor the tooth in the socket
Periodontal tissue
Bone, bony sockets, or crypts for teeth placement in the maxilla and the mandibular bone
Alveolar tissue
Mucous tissue surrounding the teeth; also gives protection to the teeth and underlying tissues
Gingiva
Connective tissues arranged in bundles and dense fibrous tissue groupings
Periodontal membranes/ligaments
Inner and outer growth on the alveolar bone
Cortical plate
Lines the alveolar socket
Lamina dura
Gum tissue
Gingiva
Study of teeth in general
Odontology
The study of tooth form and shape
Morphology
Single-rooted anterior teeth with a sharp cutting edge
Incisors
Single-rooted anterior teeth at the corners of the mouth
Cuspids (canines)
Fourth and fifth teeth from the center of the mouth
Premolars
Most posterior teeth
Molars
Three roots
Trifurcated
Two roots
Bifurcated