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Dental Anatomy > 1st lecture comparative dentistry > Flashcards

1st lecture comparative dentistry Flashcards

1
Q

What has a functional basis?

A

Every curve and segment of a normal tooth

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2
Q

Four Phylogenetic Classes of Tooth Forms

A
  1. Single Cone (haplodont)
  2. Three Cusps in line (Tricondont)
  3. Three Cusps in a Triangle (Tritubecular Molar)
  4. Four Cusps in a quadrangle (quadritubecular molar)
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3
Q

Single Cone

A

haplodont

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4
Q

Three Cusps in line

A

trricondont

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5
Q

Four Cusps in a quadrangle

A

quadritubecular molar

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6
Q

Haplodont

A

Reptilian Stage

-Simplest form of tooth= single cone

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7
Q

Characteristics of Haplodonts

A

-Many teeth in both jaws
-Jaw movement is limited, to simple open and close- hinge
-NO OCCLUSIOn of teeth
-Teeth used for prehension or combat

-Main function is procurement of food. Jaw movements are related and government by tooth form in all cases

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8
Q

Tricondont

A

Easy Mammalian Stage

-Three Cusps in a line in posterior teeth

-The Largest cusp is centered- with a smaller cusp located anteriorly and posteriorly

-Carnivores have teeth representing this form

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9
Q

Tritubercular

A

Dogs and Carnivores

-THREE Cusps in a Triangle

-Three cornered tritubercular molar arrangement

-teeth bypass each other more or less when jaw is opened or closed

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10
Q

Tritubercular

A

Dogs and Carnivores

-THREE Cusps in a Triangle

-Three cornered tritubercular molar arrangement

-teeth bypass each other more or less when jaw is opened or closed

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11
Q

Quadritubercular

A

-First time that one reflects occlusal contact relationship between the teeth of upper and lower jaws.

Four Cusps in a quadrangle!

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12
Q

Apes

A

Have similar dentition to humans.

Main difference is the development of the canines, arch form, and jaw development!

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13
Q

Lobes

A

The multiplication and fusion of lobes during tooth development are demonstrated graphically when human teeth are viewed from the mesial or distal aspects. Anterior teeth, which are used for incising or apprehending food, reflect the single cone, whereas the posterior or multicusped teeth, which are used for grinding food in addition to having a shearing action, appear to be two or more cones fused

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14
Q

What represents a primary center of formation?

A

Each Lobe of a tooth- this ALL teeth appears to be a combo of four or more lobes!

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15
Q

Primary Center of Formation

A

Mamelon, Cingulum, Cusp Tip

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16
Q

Anterior Teeth

A

Mesial, Labial/Facial, Distal, and Lingual Lobe

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17
Q

Premolars

A

Mesial, Buccal, Distal, Lingual- if you are a 3 cusp variety of the Mandibular 2nd Molar, you have a mesiolingual and distolingual lobe!

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18
Q

Molars

A

Named as the cusps

1: Mesiobuccal Cusp = Mesiobuccal Lobe

19
Q

Isognathus

A

Jaws of equal size
Trait is to LIMIT lateral movement

20
Q

Anisognathous

A

Jaws of unequal size
Trait tends to increase mobility of the mandible in a lateral direction

21
Q

Bunodont

A

Refers to tooth-bearing conical cusps

22
Q

Selenodont

A

Characterized by low crowns, crescent shaped cusps when viewed from above

23
Q

Tooth form and jaw movements of humans

A

Humans are bunodont and relatively isognathus- not perfectly isognathus because the maxillary arch overlaps horizontally the mandibular arch

24
Q

Geometries

A

All aspects of each tooth crown except the incisal or occlusal aspect may be outlined schematically by these three shapes:

1) Triangle
2) Trapezoid
3) Rhomboid

25
Q

Anterior Teeth from the Proximal Shape

A

Triangular

Because these teeth are prehensile

26
Q

Trapezoid

A

All TEETH from the facial/lingual- with the longest uneven side toward the occlusal/incisal and the shorter side at the cervix

This allows for two antagonist in opposing arch

27
Q

Shape of the Proximal surface of Maxillary Posterior Teeth

A

Trapezoids- with the shortest uneven side toward the occlusal, longer side at the cervix

Helps to penetrate food, without constriction, the occlusal forces could be overwhelmed for the base of crown.

28
Q

Shape of Proximal Surface of Mandibular Posterior Teeth

A

Rhomboids

The rhomboidal form inclines the crown in a lingual direction.

Long axes of maxillary and mandibular teeth are kept parallel to one another

29
Q

Each tooth of the dentition has two antagonist– what is the exception

A

Except the mandibular central incisor

30
Q

Form and Function

A

Incision, prehension, and trituration

31
Q

Human Dentition

A

Omnivores

32
Q

A general restorative principle states that occlusal forces in dental restorations should be directed along which axis of teeth?

A

The long axis

33
Q

Interproximal Form

A

*Proximal contacts protect the soft tissue between teeth

Tissue that occupies this space is called the interdental papilla or gingival papilla

34
Q

Dehiscence

A

Partial absence of bone over the tooth

35
Q

Fenestraton

A

Window or hole in the bone with an intact gingival alveolar process

36
Q

Root Form

A

Associated with the overall form of the tooth and the work it has to do.

The angle of the incisal and occlusal surfaces of anterior and posterior teeth are positioned to be placed OVER the center of the root or WITHIN confines of the root trunk

37
Q

Roots of which teeth are flared for stabilization

A

Posterior teeth

38
Q

Is the dental arch flat?

A

No

39
Q

Curvature of Spee

A

Anterior to Posterior curvature of dentition

40
Q

Curvature of Wilson

A

FACIAL TO LINGUAL CURVATURE OF THE POSTERIOR TEETH

41
Q

Compensating Occlusal Curvature

A

Is a combination of the curve of spee and the curve of Wilson

42
Q

Overjet

A

Horizontal overlap

43
Q

Overbite

A

vertical overlap

Dental Anatomy (17 decks)

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