W3 Occlusion relationship

Question 1

What is the horizontal alignment controlled by?

Answer 1

The tongue, lips and cheeks, along with the cuspal relationship with the opposing teeth

Question 2

Define the Curve of Spee

Answer 2

The curve of the buccal cusp tips of posterior teeth from an anterior-posterior direction

Question 3

Define the Curve of Wilson

Answer 3

The curve of the posterior teeth from a left to right direction

Question 4

Define Centric Relation

Answer 4

The relationship of the Maxilla and Mandible when jaws are closed together.

To find tilt the head back as far as possible and close teeth gently together

Question 5

Define Centric Occlusion

Answer 5

The relationship of the teeth within the jaws that allows the most contact between teeth

To find tilt the head forward

Question 6

Define contact points

Answer 6

Where the occlusal surface of one tooth touches the occlusal portion of the opposing teeth. The contact points create what we know as the occlusion

Question 7

Define Flush terminal plane

Answer 7

Distal surfaces of both Maxillary and mandibular molars are even

Question 8

Define Mesial Step

Answer 8

Maxillary molar is situated more distally then the Mandibular molar

Question 9

Define Distal Step

Answer 9

Maxillary molar is more mesial than the Mandibular molar

Question 10

Define Normal Molar Occlusion relationship

Answer 10

Mesiobuccal cusp of maxillary first molar occludes with the mesiobuccal groove of mandibular first molar

Question 11

Describe Cainine/premolar relationship in normal occlusion

Answer 11

Maxillary canine occludes with the distal half of the half of the Mandibular canine and mesial half of the mandibular first premolar

Question 12

Describe Incisor relationship in Normal Occlusion

Answer 12

Lower incisors occlude below or at the cingulum of upper incisors

Question 13

Describe Class II occlusion in the Molar relationship

Answer 13

(Distal step) Mesiobuccal groove of mandibular first molar is positioned distally to the mesio buccal cusp of Maxillary first molar

Question 14

What is Class II Division 1?

Answer 14

Is when the Maxillary anterior teeth are proclined and a large overjet is present

Question 15

What is Class II Division 2?

Answer 15

Is where the maxillary anterior teeth are placed lingually and a deep overbit exists

Question 16

Define Class III occlusion of the Molar relationship

Answer 16

Mesiobuccal groove of Mandibular first molar is positioned mesially to the mesiobuccal cusp of Maxillary first molar

Question 17

Describe the Incisor relationship in Class III occlusion

Answer 17

• Cross bite
• Edge to edge

Question 18

Define Class I Malocclusion in Molar/Canine relationship

Answer 18

Similar to normal occlusion. Mal-relationships between other individual or groups of teeth

Question 19

Describe the Incisor relationship in Class I Malocclusion

Answer 19

May be openbite, end to end bit, over bite

Question 20

Describe Overjet

Answer 20

Distance between the labial surface of the mandibular incisors and the incisal edge of the Maxillary incisors

Horizontal relationship

Question 21

Describe Overbite

Answer 21

The amount of overlap of the mandibular teeth by the Maxillary teeth

Vertical relationship

Question 22

What 3 malocclusion are Transverse Relationships?

Answer 22

Cross bite Scissorbite Midlines

Question 23

Define cross bite

Answer 23

Can be anterior or posterior. Occlude with tooth in opposing arch in the opposite relation to normal

Question 24

Define Scissor bite

Answer 24

When the mouth if closed the molars miss each other and overlap with no contact

Question 25

Define Midline shift

Answer 25

The dental midline may be shifted in either direction away from the facial midline

Question 26

What is a Contact Area?

Answer 26

The areas of the teeth where the proximal surfaces touch eachother

Question 27

Benefits of touching contact areas?

Answer 27

Prevent food packing Provide anchorage and support to eachother Protection from traumatic forces

Question 28

Define embrasure

Answer 28

Space between the teeth that are surrounding the contact areas

Question 29

What are the prinipal differences in crown morphology of deciduous and primary?

Answer 29

• Deciduous teeth have a pronounced cervial margin
• The cervical buldge is accentuated in the mesiobuccal area of deciduous molars
• The crowns of anterior deciuous teeth are bulbous with a pronounced labial cingulum

Question 30

What are the prinipal differences in root morphology of deciduous and primary?

Answer 30

• Roots of deciduous teeth are short weaker and lighter in colour
• Roots of anterior deciduous teeth are longer in porportion to the crown
• Root of posterior deciduous teeth are more divergent to allow developing pernament successor

Question 31

What are the prinipal differences of enamel in deciduous and primary?

Answer 31

• Decidous teeth enamel appears white
• More opaque
• Giving the crown a lighter colour
• More permeable easily worn down
• Depth of enamel more consistent and thinner than in pernament teeth

Question 32

What are the prinipal differences in dentine, pulp and CEJ of deciduous and primary

Answer 32

Pulp chambers are larger than those of pernament

Prominent pulp horns

Root canals are fine in deciduous teeth

Dentine depth is less

CEJ is less sinuous

Deciduous teeth display consistant morphology and have less variations

Question 33

What is natural spacing, primate spacing and lee way spacing?

Answer 33

• Natural spacing is the nature space for deciduous teeth
• Primate spacing is the space between cainines eg Maxillary mesial to canines, Mandibular teeth (distal to canines)
• Leeway spacing extra space gained from exfoliation of deciduous molars and the eruption of smaller premolars

Question 34

What is the effect of premature loss of primary tooth on the pernament dentition?

Answer 34

• Delayed/accelarted eruption
• Impaction/ectopic eruption
• Loss of arch length