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Ch 8 Dentistry
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43 Terms
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1
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Enamel
- hardest material of the body
- makes up the anatomical crown of the tooth
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Dentin
- makes up the bulk of the tooth
- covered by enamel on the crown and cementum on the root
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Cementum
- rigid connective tissue that covers the root of the tooth
- anchors tooth to the bony socket
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Pulp
- made of blood vessels and nerves
- blood supply derived from branches of dental arteries
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Periodontium
- supports, nourishes, and protect the teeth
- consists of cementum, alveolar bone, and periodal ligaments
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Apical foramen
the hole at the tip of the root where nerves and blood vessels enter the tooth
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Apex
situated just above the apical foramen
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Pulp horns
elongations of the coronal pulp
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Coronal pulp
connected with the accessory canal and lies in the crown portion of the tooth
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Bud (initation) stage
tooth formation begins
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Cap (proliferation) stage
cells of the developing tooth increases ; tooth increases in size
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Bell (histodifferentiation) stage
different tissues of the tooth form
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Morphodifferentiation
development of different tooth types or shape
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Anterior mandibular region
site of earliest signs of tooth development at 5 to 6 weeks
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Tooth and jaw size
genetic factor that is most often concerned in prenatal development
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Succedaneous teeth
- also known as decidous teeth
- permanent teeth
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Eruption
movement of the tooth into its functional position in the oral cavity
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Exfoliation
normal process by which the primary teeth are lost
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Osteoblasts
cells that form bone
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Osteoclasts
cells that resorb bone
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Osteocytes
a bone cell, formed when an osteoblast becomes embedded in the matrix it has secreted
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Fibroblasts
- cells that produce collagen and other fibers
- permit continuous and rapid remodeling of periodontal ligament
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Odontoblasts
cells that form dentin
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Cementoblasts
cells that form cementum
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Ameloblasts
cells that form enamel
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Attrition
a wearing down over time
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Remodeling
occurs in response to forces placed on the tooth in its socket
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Teratogens
- environmental agents that harm the embryo or fetus
- infections, radiation exposure, drugs
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Preimplantation
- first period of prenatal development
- first week to second week
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Embryonic period
- most critical stage of prenatal development, from second to eighth week
- face and related tissues begin to form
- ectoderm, mesoderm, and endoderm are produced
- branchial arches have formed
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Fetal phase
- eight weeks to birth
- all primary teeth develop by 17th week
- about 44 teeth developing by birth
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Clinical crown
part of the tooth that is visible in the mouth
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Anatomical crown
portion of the tooth that is covered with enamel
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Ectoderm
- outermost embryonic layer
- enamel of teeth
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Mesoderm
- middle layer
- cementum, dentin, and pulp form
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Endoderm
innermost layer
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Lining mucosa
- soft, moist, can stretch and compress
- lines inside of cheeks and underside of tongue
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Masticatory mucosa
- rubbery and resilient
- lines attached gingiva and upper surface of tongue
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Specialized mucosa
located on the top surface of the tongue as papillae
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Yellow to grayish white
colors of enamel
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Primary dentin
- formed before eruption
- forms bulk of the root
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Secondary dentin
- begins forming after eruption
- continues very slow formation throughout tooth's lifespan
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Tertiary (reparative) dentin
- formed in response to irritation
- appears as a localized deposit on the wall of the pulp chamber
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