Access cavity preparation Flashcards
what are some factors that can affect the size of the pulp chamber?
age of patient ( more recession in older patients ) , trauma , extensive caries , calcium hydroxide
correct convivence form will result in :
making sure that the instrument is controlled by 2 factors only , the clinician and the walls of the canal touching the tip of the file
toilet of the cavity is done by using:
sodium hypochlorite before radicular preparation is begun to avoid obstruction of the root canals and achieve hemostasis
ultrasonic tips are used for :
penetrating calcified canals
canine outline :
oval
the upper central incisor has a 29 degree lingual axial inclination and a 16 degree mesial axial inclination , failing to recognize these inclinations will lead to:
gouging of labial or distal walls
discoloration of the crown can occur due to:
failure to remove pulp debris
outline of premolar:
upper: oval
lower; ovoid
entire reparation of maxillary firstmolar is done in the ____ half
mesial
describe the usual positions of the orafices of the lower first molar:
MB is under the MB cusp tip
ML is located at the same line as MB ,lingual to central fissure
distal is is located distal to central fossa ( extra canal may be found lingually r buccally to distal orafice + DB, DL)
Point of entry for mandibular first molar:
central fossa, slightly mesial
what is the law of CEJ?
at the level of the CEJ , the distance from the external surface of the tooth to the walls of the pulp chamber is the same
law of symetry 1:
except for maxillary molars, canal orificies are equidistant from line drawn in a mesiodistal direction through the center of the pulp chamber floor
law of symmetry 2
except for the maxillary molars, the orifices of the canals lie on a line perpendicular to a line drawn in a mesial-distal direction across the center of the floor of the pulp chamber.
Orifice location:
The orifices of the root canals are always located at the junction of the walls and the floor.
