Flashcards in Access Preparation Deck (23)
What are the general access prep shapes for teeth?
1-Anterior and Bicuspid: Ovoid
2-Max Molar: Triangular
3-Mand Molar: Rhomboid
Which law says, the pulp chamber of the tooth is always located in the center of the tooth at the level of the CEJ?
Law of Centrality
Which law says, the outline of the pulp chamber of a tooth is concentric to the outer boarder of the tooth at the level of the CEJ?
Law of Concentricity
What is the rule of symmetry?
The orifices to the pulp chamber are symmetrical with respect to a line drawn in a mesial distal direction
How many canals do Maxillary Incisors have?
1 canal 100% of the time
*Centrals and laterals are mostly the same
Mandibular incisors can be the most difficult to access and have two candles how often?
*Classically a triangular-ovoid shaped access
How often do maxillary and mandibular canines have two canals respectively?
Maxillary Canine: Never (100% one canal)
Mandibular Canine: 3-6% with two canals
How often do 1st maxillary premolars have multiple canals?
60-80% have 2
6% have 3
How often do 2nd Max premolars have one canal?
80-90% one canal
How often do 1st mandibular premolars have multiple canals?
-75% one canal
-25% two canals
-1% three canals
How often to 2nd mandibular premolars have two canals?
-15% two canals
*85% one canal
Which tooth has the most complex root and canal anatomy?
Maxillary 1st molar
*usually 3 roots, 4 canals
How many canals do each of the 3 roots of a 1st maxillary molar have?
-Palatal: 100% one canal
-Distobuccal: 100% one canal
-Mesiobuccal: 20-80% two canals
What is characteristic of Maxillary 2nd molars?
-Similar root anatomy to max 1st molars
-More variation (1-4 canals)
-Roots often fused
Mandibular 1st molars have two roots and 3-4 canals, how often to the medial and distal roots have 2 canals?
Mesial: 70-80% 2 canals
Distal: 25-30% two canals
Mandibular 2nd molars are just smaller and more symmetrical than mand 1st molars and have two roots in the distal canal how often?
Dital root: 5-8% two canals
____% of all roots are curved
Which roots always have 1 canal?
-Maxillary Incisors (centrals and laterals)
-Palatal and Distobuccal roots of Max 1st molars
Maxillary anterios have how many canals?
Mandibular incisors have how many canals?
Two canals 30-40%
Maxillary premolars have how many canals?
Two canals 60-80% (1st)
One canal 80-90% (2nd)
Mandibular premolrs have how many canals?
Two canals 15-25%