Flashcards in Occlusion Deck (16)
What is Bennett Movement?
The left and right condylar motions caused by lateral moments of the mandible
What is Bennet Shift?
The lateral moment of the mandible towards the working side during lateral excursion. *The flatter the cusp the greater the shift.
What is Bennett Angle?
The angle obtained after the nonworking side condyle has moved anteriorly and medially, relative to the sagittal plane. *The flatter the cusp, the greater the side shift.
What is a Odontoma? Complex vs Compound?
Odontoma = normal dental tissue that has grown in an irregular way.
Complex = is unrecognizable as dental tissues, (Unorganized) It usually appears in the posterior maxilla or in the mandible.
Compound = still has the three separate dental tissues (enamel, dentin and cementum), but may present a lobulated appearance where there is no definitive demarcation of separate tissues between the individual "toothlets" (or denticles). It usually appears in the anterior maxilla.
What is concrescence and where is it commonly found?
Union of 2 or more teeth through cementum only.
*Most commonly found in the permanent molars.
*Fusion involves enamel and dentin, and occurs prior to eruption.
What are Enamel tufts?
areas of hypomineralization that extend from the DEJ up to 1/3 the the thickness of the enamel layer.
What do enamel tufts, spindles and lamellae all have in common?
They are all caused by enamel hypo mineralization and are NOT related in caries susceptibility.
What are enamel spindles?
Trapped odontoblastic processes
What are Enamel lamellae?
cracks that run the length of the enamel layer from DEJ to the tooth surface.
What is Turner's Hypoplasia (turners tooth)?
An abnormality in the form of missing or diminished enamel
*Typically only affect one tooth!
What is Amelogenesis imperfect?
Abnormal formation of enamel where enamel is mostly composed of mineral and at higher risk of caries.
What is Dilaceration?
Distortion of the root AND crown from their normal linear relationship.
What is Flexion?
Distortion of root portion only.
What is hutchinson's incisors?
Sign of congenital syphillis (Bacterial) where babies have smaller more spaced teeth with notches in the biting surfaces.
What is Dentogenesis imperfecta?
Genetic disturbances of dentin formation, crown has bluish brown color.