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73 Cards in this Set
- Front
- Back
Which root of a Max. first molar commonly has two root canals?
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The mesiobuccal root
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The Max. 1st molar has _____ roots and _____ canals.
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3,3
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What root of the Max. 1st molar is usually the largest in dimension?
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Palatal root
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Which root of the Max. 1st molar is usually very wide buccolingually?
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mesiobuccal root
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What percentage of Max. 1st molar teeth have a fourth root canal?
Where is it located/ |
15%
Found just lingual to the orifice of the mesiobuccal canal. |
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What features are very prominent in the interior of the Max. first molar
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Pulp horns
Mesiobuccal and mesiolingual are higher than the distofacial and platal |
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In all Molars where do the root canals join?
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Join the pulp chamber apical to the cementoenamel junction
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In which teeth will we most likely see a bifurcation in the apical third of the root?
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Max. first pre-molars
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Where do bifurcations in Mand. molars usually occur?
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Cervical or Middle third of the root
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What teeth have a single root type?
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Max and Mand. Incisors
Max. and Mand. canines Max. second pre-molar Mand. first and second pre-molars |
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what teeth have bifurcating or two roots?
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Max. first pre-molars (buccal/palatal)
Mand. molars (mesial/distal) |
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What teeth have a trifurcation or three roots?
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Max. first and second molars
(mesiobuccal, distobuccal, and palatal) Some Max third molars but variations are many |
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What is the largest longest and strongest root of the Max. first molar?
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Palatal
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What is the smallest root on the Max. first molar?
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Distobuccal
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The palatal root is the _____ _____ root of any of the maxillary teeth.
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3rd longest; after canine and 2nd premolars
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What are the characteristics of the palatal root of the max. first molar?
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Wider mesiodistally than faciolingually
Longitudinal depression on lingual Concave on Buccal surface From facial in line w/ facial groove |
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If the max. sinus is perforated during surgery what root is most likely responsible?
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Palatal root of Max. 1st molar
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How many major cusps do mand. molars have compared to max. molars
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5:4
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When viewed occlusally what shape does Max. molars have?
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Rhomboid
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when viewed occlusally what shape does Mand. molars have?
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Rectangular
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How many roots do Mand. molars have?
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2
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How many roots do Max. molars have
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3
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Where do Mand. molars have pits and grooves?
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Occlusal and buccal surfaces
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Where do Max. molars have pits and grooves?
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Occlusal and lingual surfaces
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Mand. Molars are wider in which direction?
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mesiodistally vs. faciolingually
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Max. Molars are wider in which direction?
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faciolingually vs. mesiodistally
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What are the size relationships of the lingual cusps of mand. molars?
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Nearly equal
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What are the size relationships of the lingual cusps of max. molars?
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One large and one small
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What is formed by the union of the distal cusp ridge of the mesiolingual cusp and the triangular ridge of the distobuccal cusp in max. molars?
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Oblique ridge
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Mandibular molars have a _____ ridge; Max. molars have a _____ ridge.
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Transverse
Oblique |
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A fissured groove is most frequently found on the ...
What is this called? |
Lingual surface of Max. molars
Distolingual Developmental Groove |
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What does the distolingual developmental groove do to an occlusal cavity prep?
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Forces the occlusal prep to be extended onto the lingual surface
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Mandibular first molars have _____ pulp canals that are usually if not always found in the _____ root. Distal root usually has _____ canal.
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2, mesial, 1
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If a cross section is made of a mand. molar just apical to the bifurcation of the root what will the shape of the distal root be?
Mesial root? |
Distal = larger and kidney shaped
Mesial = smaller and circular |
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Which canal curves more in a Mand. first molar?
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MB more than ML
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What are the characteristics of the mesial root of the mand. first molar?
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Very thin mesiodistally
wider faciolingually concave on mesial and distal surfaces |
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On the Mand. first molar what pulp horn is the highest?
What is the smallest? |
Mesial
Distal |
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What is the rough shape of the floor of the pulp chamber in a Max. molar?
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Triangular
base: buccal canals apex: palatal canal |
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From either proximal view, max. molar crowns have what kind of outline?
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Trapezoidal outline
Longest side is base of crown |
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From either proximal view mand. molar crowns have what kind of outline?
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Rhomboidal outline
Tilts toward lingual |
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What does the lingual inclination of mand. molars do to its long axis position?
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Long axis positioned with root apices facial and crown lingual.
This encourages cusp fracture |
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The distolingual cusp on permanent max. molars is called what?
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Talon Cusp
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Mandibular first molars have _____ pulp canals that are usually if not always found in the _____ root. Distal root usually has _____ canal.
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2, mesial, 1
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If a cross section is made of a mand. molar just apical to the bifurcation of the root what will the shape of the distal root be?
Mesial root? |
Distal = larger and kidney shaped
Mesial = smaller and circular |
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Which canal curves more in a Mand. first molar?
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MB more than ML
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What are the characteristics of the mesial root of the mand. first molar?
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Very thin mesiodistally
wider faciolingually concave on mesial and distal surfaces |
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On the Mand. first molar what pulp horn is the highest?
What is the smallest? |
Mesial
Distal |
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What is the rough shape of the floor of the pulp chamber in a Max. molar?
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Triangular
base: buccal canals apex: palatal canal |
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From either proximal view, max. molar crowns have what kind of outline?
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Trapezoidal outline
Longest side is base of crown |
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From either proximal view mand. molar crowns have what kind of outline?
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Rhomboidal outline
Tilts toward lingual |
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What does the lingual inclination of mand. molars do to its long axis position?
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Long axis positioned with root apices facial and crown lingual.
This encourages cusp fracture |
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The distolingual cusp on permanent max. molars is called what?
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Talon Cusp
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What is the most obvious characteristic that distinguishes permanent 1st, 2nd, and 3rd max. molars from each other?
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Talon cusp gets smaller as you move distally
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What is the primary cusp triangle called on the max. molar
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Trigon
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What cusp forms the trigon of the max. molar?
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ML, MB, DB cusp
DL cusp = Talon cusp |
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What is a cusp present abnormally called?
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Talon Cusp
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True/False
The Talon cusp might not be present on the Max. 1st and 2nd molars |
True
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True/False
The DL cusp or Talon cusp of the Max. molar is a pert of the primary |
False
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When restoring marginal ridges of posterior teeth what must you remember to do in order to keep enough strength?
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Round them off to form occlusal embrasures
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Where are marginal ridges found?
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Mesial and distal occlusal surfaces of molars/ premolars
mesial and distal surfaces of lingual surfaces of the incisors and canines |
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As a general rule root tips tend to point which way?
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Toward the distal if at all
Max teeth least likely mand. Centals and Canines most likely |
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Relative to the long axis of the tooth Mand. molars are inclined to the ...
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Lingual and Distal
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What is the result of the Axis inclination of mand. molars?
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HofC is lowered apically to the middle third
Placement of instruments subgingivally is more difficult on the lingual |
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What tooth is contacting the opening from the parotid gland and is thus more susceptible to calculus buildup?
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Max. second molar
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What is the opening of the parotid gland into the oral cavity called?
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Stenson's Duct
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How many roots are visible from the buccal aspect of the max. first molar?
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3
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What is the shape of the two buccal roots of a Max. first molar?
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Bent looking like a pair of pliers
Axes of the root inclined distally |
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Molar roots originate as a single root base. What is this called?
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Root trunk (near CEJ)
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The place on multirooted teeth where the root trunk divides into separate roots.
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Furcation
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Mesial furcations are _____ to the cervical line.
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Closest
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Distal furcations are _____ to the cervical line.
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Furthest
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What is located on the buccal root of the max. first molar which starts at the bifurcation and terminates at the cervical line?
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Deep Developmental Groove
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What has to be taken into consideration for the Max. first molar when doing root planing?
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Distal surface of the root trunk has a concavity
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