Occlusion

Question 1

Define malocclusion

Answer 1

Malocclusion: known as the improper positioning of the teeth and jaws

Question 2

List the common effects of Malocclusion

Answer 2

1. Bite - Causing Occlusal Trauma and which can influence teeth already effected by existing periodontitis
2. Ability to maintain adequate plaque control
3. Speech development
4. Appearance

Occlusal trauma
• Occlusal Trauma can be defined as damage incurred when teeth are left in traumatic occlusion without proper treatment
• If this traumatic occlusal relationship is not balanced properly it may result in pain, tenderness and even mobility of the affected teeth due to bone loss

Question 3

List the 5 stated characterises of malocclusion

Answer 3

Overbite

Overjet

Open bite

Anterior edge to edge

Cross bite

Question 4

Define overbite

Answer 4

• Is an extension of the upper front teeth over the lower front teeth when the mouth is closed
• When the incisal edges of the lower ant teeth contact the soft tissues of the hard palate, this is a 100% overbite

Question 5

Define overjet

Answer 5

• Overjetis the extent of horizontal (anterior-posterior) overlap of the maxillary central incisors over the mandibular central incisors
• Overjet is when the front teeth are reaching the sky, lol

Question 6

Define open bite

Answer 6

• An Open Bite can be defined as an abnormal dental condition in which the anterior teeth in the maxilla do not occlude with the lower anterior teeth, in any mandibular position, particularly when the mouth is normally closed

Question 7

Define anterior edge to edge

Answer 7

• 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)

Question 8

Define cross bite

Answer 8

• Mandibular teeth are in buccal version (or completely lingual version in posterior segments) to the maxillary teeth

Question 9

Understand Angles Molar classifications

Answer 9

• Angle’s classification: classifies the relationship of mandibular first molar to maxillary first molar
• Normally: Buccal groove of mandibular first molar and mesiobuccal cusp of maxillary first molar
• Use canines if molars are absent: upper canine will sit between the lower canine and lower first premolar

Question 10

Describe class I in Angles Molar classification

Answer 10

The tip of the mesiobuccal cusp of the upper 6 molar aligns with the buccal groove of the lower 6

Question 11

Describe class II Division I in Angles Molar classification

Answer 11

• The tip of the mesiobuccal cusp of the upper 6 is mesial to the buccal groove of the lower 6
• An overjet is present on the all anterior teeth

Question 12

Describe class II Division II in Angles Molar classification

Answer 12

• The tip of the mesiobuccal cusp of the upper molar is mesial to the buccal groove of the lower 6
• The lateral incisors are inclined forward but the central incisors are in a relatively normal position but there is a deep overbite

Question 13

Describe Division III in Angles Molar classification

Answer 13

• The tip of the mesio buccal cusp of the upper 6 is distal to the buccal groove of the lower 6
• An anterior X-Bite is present on the anterior teeth

Question 14

Describe the differences between a CL 2 Div 1 and CL 2 Div 2 occlusion

Answer 14

• Division I: overbite with overjet

* Division II: central incisors in relatively normal position with overbite

Question 15

List 6 malposition’s of individual teeth

Answer 15

Facioversion

Linguoversion

Supraversion (“Over Eruption”)

Rotated Tooth

Dental Midline Shift

Crowded Teeth

Question 16

Describe facioversion

Answer 16

Facioversion can be defined as a malposition of a tooth going more facially (direction lips/cheeks)

Question 17

Describe linguoversion

Answer 17

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

Question 18

Describe supraversion

Answer 18

Tooth is out of the line of the occlusion in an occlusal direction, resulting in an overbite. It is often caused by the premature loss of the opposing tooth.

Question 19

Describe rotated tooth

Answer 19

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

Question 20

Describe dental midline shift

Answer 20

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.
Right picture shows individual’s midline that would be said to be deviated 2 mm to the Right.