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35 terms

Cementum and Alveolar Bone Proper

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Oldest alveolar bone proper is located
Near the CEJ
Primary cementum is located
Next to Dentin
Lining of alveolus
Alveolar Bone Proper
Cementum and Alveolar bone proper form from
Dental sac/follicle
Alveolar bone proper forms by
Intramembranous Ossification
Components of Cementum
1. Cells (cementoblasts, cementocytes and cementoclasts) 2. Fibrous matrix (Collagen type I fibers) 3. Ground substance
Which component of cementum is more predominant?
Fibrous Matrix
Components of Alveolar bone proper
1. Cells (osteoblasts, osteocytes, osteoclasts) 2. Fibrous matrix (Collagen type I fibers) 3. Ground substance
Which component of alveolar bone proper is more predominant?
Fibrous Matrix
Collagen fibers of PDL
Run into bone and cementum at a 90 degree angle, perpendicular to bone and cementum. Type I, some III and oxytalan.
Collagen fibers of Cementum and Bone
Produced by either cementoblasts or osteoblasts, run parallel to DCJ. Type I fibers
Acellular Cementum
The oldest, located in cervical 1/3 of root. The first cementum laid down, thin, can remove with instruments
Acellular Cementum is located next to
Dentin because needs blood supply
Secondary/Cellular Cementum
The newest, located in apical and middle 1/3, second formed. Formed after tooth has reached functional occlusion. Continues to deposit cementum throughout life of tooth
Cellular Cementum can change to
Acellular Cementum because junctional epithelium can move apically so there's no blood supply
Types of cementoenamel relationships
1. Overlap 2. Meet 3. Gap
Overlap relationship
60% of cases, REE breaks down early
Meet relationship
30% of cases. Cementum and enamel meet end to end. Hertwig Sheath broken up at right time
Gap relationship
10% of cases. Hertwig Sheath did not break up. Dentin is exposed and patients experience hypersensitivity
Abnormal features of cementum
1. Cementicles 2. Cemental Spurs 3. Hypercementosis
Cementicles
Calcified bodies of cementum. May be free floating, attached or embedded. NOT seen on x-rays
Cemental Spurs
Found at or near CEJ, similar to enamel pearls. Due to irregular deposition of cementum
Hypercementosis
Excessive production of cellular cementum, mainly occurs at apex. Usually found in elderly people
Lamina Dura
Term used for alveolar bone proper ONLY when looking at x-rays
Cribiform Plate is also called
Alveolar Bone Proper
Alveolar Bone Proper is
Compact bone, very dense and hard
Cortical Plate
Outermost bone, Compact
Inner cortical plate
Faces the tongue or palate (Lingual)
Outer cortical plate
Faces the lips and cheeks (Facial)
Two layers of Alveolar Bone Proper
1. Bundle Bone 2. Compact Bone
Bundle Bone
Inner layer of alveolar bone proper, located by PDL, contains Sharpey's Fibers
Compact Bone
Outer layer of alveolar bone proper, lies next to spongy bone
Interradicular Septum
Alveolar Bone between roots of one tooth (multirooted teeth)
Interdental Septum
Alveolar Bone between adjacent teeth (AKA interproximal bone)
Alveolar Crest
Located at top of interdental septum