Dental Morphology - Axial Contours, Proximal Contacts Embrasures and Primary Den
Terms
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- Each tooth contacts adjacent teeth on both of its proximal surfaces except
- Third Molars
- Generally contact areas are more facially/distally located
- facially
- The proximal contact that involves the mesial of 2 different teeth is found where
- between both max and mand central incisors
- Proximal contacts lend support to what aspect of the dental arch
- entire dental arch
- give the incisocervical location of the max and mand cent, lateral and canines
-
IJ, JM, JM
II, II, IM - What is the name of the gentle curve formed if you connect the proximal contacts of the posterior teeth in 1 quadrant
- Curve of Spee
- The lingual inclination of the mand post teeth and the buccal inclination of the maxillary teeth for what curve
- Curve of Wilson
- Summarize the contacts of the posterior teeth in a quadrant with respect to occlusocervical location
-
MM, MM, MM, MM, M - maxillary
MM, MM, MM, MM, M - mandibular - Summarize the contacts of an entire quadrant with respect to occluso/inciso cervical location
-
IJ, JM, JM, MM, MM, MM, MM, M - maxillary
II, II, IM MM, MM, MM,MM, M - mandibular - What are the general rules in regards to the proximal contact incis/occlusocervical relation of the teeth in a quadrant
-
1. The more anterio the tooth, the more incisal/occlussal the proximal contact is
2. For any tooth, the mesial contact area is always more toward the incisal/occlusal surface than the distal - The interdental papilla generally has what shape
- triangular
- In healthy mouths the saggy tentlike area of tissue in the interproximal area is called
- Col
- What are the 3 types of embrasures
-
Incisal/occlusal, lingual, and facial
IN CLASS WILSON SPOKE OF A FOURTH CALLED THE GINGIVAL WHICH IS OPPOSITE THE INCISAL/OCCLUSAL - What provides a natural spillway to help move food out of the occlusal area during chewing
- Embrasure - they also help expose teeth to oral fluids and mechanical cleansing action of tongue, lips and cheeks
- Besides facial and lingual embrasures being confluent(indistinguishable) from the interdental area, it is also confluent with what other structure
- The occlusal/incisal embrasure
- In the anterior teeth, the lingual and facial embrasures are roughly _________ and the posterior teeth embrasures have facial embrasures that are __________ compared to the lingual ones
- equal in depth, shallower
- An imaginary line circling the tooth at its greatest bulger or circumference is called
- Height of Contour
- The proximal contacts lie which direction of the HOC
- On the HOC
- The facial and lingual contacts are best seen from what view of a tooth
- proximal
- Where are anterior teeth have facial and lingual HOC's usually located incisocervically where
- cervical 1/3 of crown
- Where are the lingual HOCs of all posterior teeth located
- Middle 1/3
- Where are the facial HOCs of all posterior teeth
- Cervical 1/3
- All max teeth exhibit facial and lingual contours that meausre how big
- 1/2 mm
- what is the measurement of the HOCs for sll the mand anterior teeth
- < 1/2 mm
- what is the measurement of the facial HOCs for the mand posteriors
- 1/2 same as that for max posteriors
- What is the measure of the lingual HOCs on the mand posteriors
- 1mm
- the flat line from the cervical line to HOC is called?
- emergence profile
- What kind of emergence profile can give a halo effect around the tooth gingiva
- Convex Emergence Profile
- What are the functions of the embrasures and proximal contacts working together
- Support arch, move food out of occlusal area which also prevents food impaction, protect the peridontium, distribute forces of masitcation
- Is the gingival or incisal/occlusal embrasure always larger
- gingival
- As you move from the centerline of the arch posteriorly, which embrasure gets smaller and which gets larger, Incisal/Occlusal or Gingival
- Gingival gets smaller, incisal gets larger
- The proximal surface of a tooth is always _______ or ________ but never ________ below the contact area
- concave, flat, but never convex
- what is the only tooth that has a mesial concavity
- max 1st premolar
- Where is the contact on ant teeth located faciolingually
- closed to middle more facial if its not
- Which facial cusps are slightly more centered than the other, mandibular or maxillary
- Mandibular facial cusps are generally more centered
- If you restore a tooth and the embrasure spaces are too small what can happen
- you empenge on the interdental papilla and can cause inflammation
- T or F permanent dentition has thicker enamel and dentin than the primary dentition
- T
- Which dentiton has more pronounced pulp horns, primary or permanent
- Primary
- Does the primary or permanent dentition have longer roots in relation to the crown size
- primary
- T or F the roots in posterior primary teeth do not tend to flare that much
- F, they flare out alot more
- Where does the permanent tooth root bud tend to sit in relation to the primary tooth
- It sits in between the area that is formed by the 'flaring" out of the roots
- T or F primary teeth are more prone to inflammation due to high number of cell turnovers
- F, although they have a more bulbous apperance which would tend to cause inflamation the high turnover limits inflammation
- What permanent tooth do the primary 2nd molars resemble
- permanent 1st molars
- Which primary tooth has a distinctive mesial-facial bulge
- Primary 1st molars
- When a primary tooth exfoliates normally, what is a characteristic of its root
- usually theres no root because it is resorbed which enables tooth to fall out
- T or F the primary teeth dont act like space maintainers for the permanent teeth
- F
- Primary teeth tend to appear more bulbous than permanent teeth due to what
- Constriction at the CEJ
- Which dentition has smaller facial and lingual HOCs, the permanent or primary
-
permanent have smaller HOCs
HOCs on primary teeth sometimes called cervical or gingival ridge - Which central incisors usually preced the others in eruption in the primary dentition
- the mandibs usually erupt before maxillary
- What cause the primary teeth to appear to be whiter than permanent teeth
- less dense dentin, remember dentin gives tooth yellow/brownish color
- The primary maxillary central incisor is wider in which direction mesiodistally or incisocervicaly
-
mesiodistally, this is disimilar to the permanent dentition.
This wider mesiodistal characteristic is true for all anterior teeth in the primary dentition - The primary max central has how many lobes and pulp horns
- 4 lobes, 3 horns
- Which of the two max incisors which is wider mesiodistally
- Central is wider than lateral
- Which primary max incisor has the more prominent cingulum
- Central, but the lateral has more prominent marginal ridges
- When looking at a proximal view of the primary ant teeth, they tend to have their incisal edges what in relation to the longitudinal axis of the too
- They tend to have incisal edge centered on the longitudinal axis. This is opposite of the permanent ant teeth
- On the primary mand incisors is the lingual anatomy less/more distinct than that of the primary max incisors
- less distinct on primary mand incisors
- Which tooth has the great incisocervical lenght, the primary mand lateral or central
- lateral is longer and slightly wider too
- Which primar mand incisor has a longer root
- the lateral has longer root than central
- Which cusp ridge is longest on the primar max canine
-
the mesial
NOTE on the primary mand the distal cusp ridge is longer - What are the 3 horns of the primary max canine named
- distal, central(largest), mesial(smallest)
- Which primary canine is wider mesiodistally
- maxillary
- What is the general outline of the primary max 1st molar
- triangular
- how many cusps does the more common form of the primary max 1st molar have
-
Generally 3(lacks distolingual) but can have 4
On 4 cusp version distolingual is smalles cusp - T or F the oblique ridge found in max molars of the permanent dentition is also found on primary max molars
- T however on the 3 cusped version the oblique ridge blends with the distal marginal ridge (oblique ridge runs from DF to ML cusps)
- Which cusp is largest and longest of the 2 facial cusps on primary max 1st molar
- Mesiofacial
- Which cusp on the primary max 1st molar is the largest overall
- mesiolingual
- Whats is the name of the groove that separates the mesiolingual and distolingual cusp(if present) on primary max 1st molar
- distolingual groove
- T or F the primary max 1st molar has the same number and arrangement of cusps as does the permanent max 1st molar
- T, the names are the distofacial, lingual, mesiofacial roots
- The size of the 3 roots on primary max 1st molar are from biggest to littlest
- lingual, mesiofacial, distofacial
- The primary 2nd max molar resembles which permanent tooth
- permanent max 1st molar, it is rhomboid shaped occlusally and the facioingual measurement is greater than the mesiodistal measurement
- which primary max molar is largest
- 2nd
- how many cusps does the primary max 2nd molar generally have
- generally 4 but can have 5th(cusp of carabelli)
- Which of the 4 primary cusps on the primary max 2nd molar are widest and smallest
- ML is largest, DL is smallest
- The longest cusp on the primary max 2nd molar is the
- ML, the other 3 are roughly equal length
- How many roots and pulp horns does the primary max 2nd molar have
- 3 roots, and either 4 or 5 horns depending on number of cusps
- What is the relationship of the faciolingual measurement of the primary mand 1st molar that makes it different
- its very small measurement in faciolingual direction
- on the primary mand 1st molar describe the cusp tips size relationships
-
both the lingual and facial mesial cusps are wider/longer than their distal counterparts
NOTE mesiofacial cusp slightly larger than mesiolingual - T or F the primary max molarss have a transverse ridge across the occlusal surface while the primary mand 1st molar has an oblique ridge on its occlusal surface
- F, the maxillaries have oblique ridge and mand 1st has transverse ridge
- How many roots do the primary mand 1st molars have
-
2 just like the permanent mand molars
mesial and distal, mesial is bigger and usually has 2 canals - The primary mand 2nd molar closely resembles what permanent tooth
-
mand 1st molar
difference is that primary 2nd has more bulbous appearance and is smaller relative size - The primary mand 2nd molar is distinguished by its mesiodistal measurement being what
- greater than its faciolingual measurement
- How many cusps does the primary mand 2nd molar have
- 5, the DF is the longest
- How do the lingual cusps of the primary 2nd molar compare to each other as far as size goes
- pretty equal
- What cusps is the facial pit of the primary mand 2nd molar located between
- MF and DF
- Which primary mand molar has the larger roots
- 2nd has larger roots
- How many canals are in the mesial root of the primary mand molars usually
- 2