1 Ortho (Midterm): Intro + Andrew's 6 Keys

Palmar numbering system

What tooth numbering system is used in orthodontics?

hairline

the outline of hair growth on the head or face:

glabella

A single bony prominence of the frontal bone located between the superciliary arches, Smooth area between the eyes:

subnasale

the point at which the nasal septum merges with the upper lip in the midsagittal plane:

pogonion

the most anterior point on the contour of the chin:

menton

the most inferior point of contour of the chin:

positive

patients with class II occlusal relationships normally will have a ____ angle of convexity

negative

patients with class III occlusal relationships normally will have a ____ angle of convexity

orthognatic

In terms of facial profile, a Class I occlusion would present with a ______ profile

retrognathic

In terms of facial profile, a Class II occlusion would present with a ______ profile

backwards

In Class II occlusions, the mandible is said to have a ______ rotation

forwards

In Class III occlusions, the mandible is said to have a ______ rotation

prognathic

In terms of facial profile, a Class III occlusion would present with a ______ profile

3rds

vertically, the entire face can be broken down into____

- nasion

- subnasale

- pogonion

For a class I relationship, what 3 points would you like to be in a straight line ( and also divide the face into equal 3rds)?

sagittal plane

ID the plane of orientation:

frontal/coronal plane

ID the plane of orientation:

transverse plane

ID the plane of orientation:

max head width x 100/ max head length

how do find the facial/cephalic index?

79-81

What is the CI (cephalic index) for a patient that is Mesocephalic / Mesoprosopic / Normocephalic?

>81

What is the CI (cephalic index) for a patient that is Brachycephalic/Euryprosopic?

<79

What is the CI (cephalic index) for a patient that is Dolichocephalic/ Leptoprosopic?

- glabela

- subnasale

When determining symmetry a line from what two points on a face determines the reverence line?

pogonion

When determining symmetry, a line from the glabella to the subnasale is the reference line, what do you evaluate the position of?

occlusion

_______ is the static and dynamic relationship of the teeth and is basic to all aspects of dentistry

a line the follows the central grooves of the posterior teeth and the incisal edges of the anterior teeth

Describe the ideal line of occlusion for the maxillary teeth:

a line that follows the buccal cusps of the posterior teeth ad the cuspal inclines of the anterior teeth

Describe the ideal line of occlusion for the mandibular teeth:

maxillary 1st molar

Which tooth is the most important tooth in determining the occlusal scheme for a patient (according to Edward Angle)?

maxillary canines

Which tooth is the most important tooth in determining the occlusal scheme for a patient (according to Simon)?

sagittal plane

Occlusal classes I, II and III are evaluated in what plane?

transverse plane

Crossbites and midline deviations are classified and evaluated in what plane?

vertical plane

Deep bites and Open bites are are classified and evaluated in what plane?

- its direct(ly below) relationship with the zygomatic buttress of the zygomatic process

- 1st perm tooth to erupt

Why does Edward Angle claim that the Key tooth in the mouth is the maxillary 1st molar?

when the MB cusp of the maxillary 1st molar falls into the buccal developmental groove of the 1st mandibular molar

describe the ideal intercuspation for a Class I occlusion:

when the mandibular 1st molar is positioned further distal to the maxillary 1st molar

describe the intercuspation of a Class II occlusion:

when the mandibular 1st molar is positioned further mesial to the maxillary 1st molar

describe the intercuspation of a Class III occlusion:

Class I

ID the class of occlusion:

Class I

ID the class of occlusion:

Class II, division 1

ID the class of occlusion:

maxillary incisors are protrusive are procumnent (proclined)

describe the incisors in a Class II, division 1 relationship:

-maxillary centrals are recumbent ( retrusive + retroclined)

-maxillary laterals are procumbent ( proclined)

describe the incisors in a Class II, division 2 relationship:

protrusive

definition: linear more forward of its normal position

proclined

definition: anglularly more inclined forward

Class II, division 1

This occlusal class presents with Maxillary incisors that are BOTH protrusive and proclined:

Class II, division 2

This occlusal class presents with Maxillary central incisors that are retrusive and retroclines, lateral incisors are proclined, patients present with deep bite

Class II, division 2

Which Class II division is considered more esthetically pleasing?

Class II, division 1

ID the class of occlusion:

Class II, division 1

ID the class of occlusion:

Class II, division 2

ID the class of occlusion:

Class II, division 2

ID the class of occlusion:

Class II, division 2

ID the class of occlusion:

Class III

ID the class of occlusion:

Class III

ID the class of occlusion:

sub-division

If a patient has a unilateral class I occlusion and a class II on the other side, what is that considered?

pseudo class III

if a patient CAN occlude in class I occlusion, but because of either habit, incisor guidance or muscular pattern, the patient prefers a class III occlusion

- can do edge-to-edge

- can be guided into Class I

- does not have retroclined lower incisors

What are 3 clinical ways you can tell if a patient is a pseudo class III?

- normal molar relationship

- mesio-distal crown angulation

- bucco-linqual crown inclination

- no rotations

- no spaces

- flat occlusal planes

What are Andrew's 6 Keys to Normal Occlusion?

- MB cusp of the max 1st molar fits in the buccal groove of the mandibular 1st molar

- DB cusp articulates w/ distal cusp of lower molar

According to Andrew's 6 Keys to Normal Occlusion, describe the ideal molar relationship:

distal

Andrew's 6 Keys to Normal Occlusion, the teeth should have a slight _____ tip

- curve of Spee

- curve of Wilson

What curves allow for flat curves in Andrew's 6 Keys to Normal Occlusion?