Ortho classification

Question 1

According to angles classification, where must the alighnment of the tooth be in reference to canine and 1st upper & lower molar

Answer 1

Mesiobuccal cusp of upper molar must be alighned to the central buccal groove

• canine rests interproximally between lower canine & 1st premolar.

Question 2

1. What is premature contact
2. What does it stimulate

Answer 2

1. A condition of tooth contact’s which diverts the mandible from a normal path of closure to centric jaw relation

• certain teeth may occlude slightly in advance of the other teeth.
• contacts that rise to very high force well before the maximum intercuspal position (MIP)

2. Stimulates osteoclasts –> bone loss

Question 3

g

What is malocclusion?

Answer 3

imperfect positioning of the teeth when the jaws are closed.

Question 4

What are main difference between overbite and overjet?
What is the normal rate for both.

Answer 4

1. Overbite
   - Vertical overlap (extention of upper over lower)
   - normal = 30%
   2.Overjet
   - Horizontal distance
   - Normal = 1-3mm

Question 5

What is an open bite?

Answer 5

When the posteiror teeth are in occlusion but not amterior.

anterior teeth in the maxilla do not occlude with the lower anterior teeth

Question 6

1. What is considered a deep overbite?
2. What is considered a 100% overbite?

Answer 6

1. What the overbite is 70-100%
2. When the incisal edges of the lower ant teeth contact the soft tissues of the hard palate, this is a 100% overbite

Question 7

What are 3 possible causes of open bite

Answer 7

Tongue Thrusting or Thumb sucking,
macroglossia,

Question 8

What does centric occlusion mean

Answer 8

Centric Occlusion
- ideal alignment of the upper and lower teeth when the jaw is in its most stable position. In centric occlusion, the upper and lower teeth fit together in a way that allows for efficient chewing and biting.

Question 9

What is Anterior edge-to-edge.

What does this lead to?

Answer 9

An Edge-to-Edge bite can be defined as an occlusion in which the anterior teeth of both jaws meet along their incisal edges when the mouth is normally closed (centric occlusion)

posterior is in centric occlusion

• causes premature fracture of anterior teeth + traumatic removal of incisal edges.

Question 10

Explain corssbite

Answer 10

A Crossbite can be defined as a malocclusion in which the mandibular teeth are in buccal version (or completely lingual version in posterior segments) to the maxillary teeth

Buccal/labial surfaces of maxilla bite ON or BEHIND the occlusal/lower anterior teeth.

Question 11

Identify and describe Class 1

Answer 11

1. Class 1 = NORMAL

• The tip of the mesio buccal cusp of the upper 6 year old molar
  aligns with the buccal groove of the lower 6 year old molar

Question 12

Look at slide 16

Question 13

Identify and describe, Class 2 Division I

Answer 13

2. Class 2 Division 1
   - tip of the mesio buccal cusp of the upper 6 year old molar is mesial to
   the buccal groove of the lower 6 year old molar

An overjet is present on the all anterior teeth from canine to canine

Question 14

Identify and describe Class 2 Division II

Answer 14

The tip of the mesio buccal cusp of the upper 6 year old molar is mesial to
the buccal groove of the lower 6 year old molar

The lateral incisors are inclined forward but the central incisors are in a relatively normal position but there is a deep overbite

Question 15

Identify and describe Class 3

Answer 15

The tip of the mesio buccal cusp of the upper 6 year old molar is distal to the buccal groove of the lower 6 year old molar

An anterior X-Bite is present on the anterior teeth

Question 16

Describe the difference between class 2 division 1 and 2

Answer 16

Slide 30

Question 17

why is it important to check both left & right 1st molars

Answer 17

There can sometimes be a difference between the left hand side and the right hand side

Question 18

What is fascioversion?

Answer 18

Facioversion can be defined as a malposition of a tooth facial (direction lips/cheeks - buccally) to the normal position

Question 19

Explain linguoversion

Answer 19

Linguoversion can be defined as a malposition of a tooth Lingual (direction tongue) to the normal position

Question 20

Supraversion? What does it result in?

Answer 20

Supraversion can be defined as the condition in which a tooth is out of the line of the occlusion in an occlusal direction, resulting in an overbite.
Often caused by the premature loss of the opposing tooth.

Question 21

what is another name for Supraversion?

Answer 21

Over eruption

Question 22

Explain a rotated tooth. What type of displacement is it?

Answer 22

is defined as observable mesiolingual or distolingual intra-alveolar displacement of the tooth around its longitudinal axis

Question 23

When does a dental midline shift occur? What’s the minimal distance that it has to shift?

Question 24

What is the dental midline?

How does this relate to midline shift.

Is it the mandibular of maxillary that moves

Answer 24

dental midline is the midsagittal line of maxillary and mandibular dental.
Each arch also possesses its own midline.

A Midline shift occurs when an individual’s mandibular teeth are shifted over to the right or left in a mesial-distal dimension, by minimum 2 mm.

Its the mandibular teeth are shifted.
Look at slide 40 to see img.

Question 25

It is a Class 2 Division 2 if the upper incisors are proclined

Answer 25

False.

Class 2 Division 1 is when there is upper incisors are proclined

Class 2 Division 2 is when upper central incisors show lingual inclination –> & may be overlapped by lateral incisors