Complete Dentures

Question 1

What are the Angles classifications of malocclusion?

Answer 1

Class I
Class II
Class II division 1
Class II division 2
Class III

Question 2

What is the molar relationship in a normal class 1 relationship?

Answer 2

the mesiobuccal cusp of the maxillary first molar aligns with the buccal groove of the mandibular first molar

Question 3

What is the canine relationship in a normal class 1 relationship?

Answer 3

the maxillary canine occludes with the distal half of the mandibular canine and the mesial half of the mandibular premolar

The mesial incline of the maxillary canine occludes with the distal incline of the mandibular canine

The distal inclinde of the maxillary canine occludes with the mesial incline of the mandibular premolar

Question 4

What is a normal line of occlusion?

Answer 4

normal smooth curves
normal overbite
matching midlines on both arches

Question 5

What is a class II occlusion?

Answer 5

this is when the distobuccal cusp of the maxillary first molar falls on the mesio-buccal grrove of the mandibular first molar

Question 6

What does class II div 1 indicate?

Answer 6

that the upper incisors are proclined

Question 7

What does class II div 2 indicate?

Answer 7

the upper lateral overlap the centrals and the centrals are retroclined

Question 8

Describe the facial profile of an individual with a class II occlusion. What is the cause of this?

Answer 8

convex face shape

mandible that is too small or maxilla that is too large

Question 9

What is an overjet?

Answer 9

it is the horizontal overlap of the maxillary central incisors over the mandibular central incisors.

how much of the upper front teeth protrude forward in relation to the lower front teeth

Question 10

What is an overbite?

Answer 10

this is the vertical overlap of the maxillary central incisors over the mandibular central incisors

how much of the front teeth cover the lower front teeth in a vertical dimension

Question 11

How can you measure overbite?

Answer 11

can be measured using a probe vertically

(how much of the lower teeth can you see)

Question 12

What is considered to be a normal overbite?

Answer 12

2-3mm

Question 13

How can you resolve an overjet that is too great to be fixed by manipulation of the tooth setting in dentures?

Answer 13

advised to remove the mandibular first premolar

in very extreme cases remove both premolars

Question 14

What is the cause of class III malocclusions?

Answer 14

generally due to an excessively large mandibular arch or smaller maxillary arch

Question 15

Describe the facial profile of an individual with a class III malocclusion

Answer 15

concave face profile

Question 16

What are some problems associated with class III cases?

Answer 16

• wider lower arch can lead to problems selecting teeth size/mould- using the same mould on both arches can lead to significant spacing therefore compromising the aesthetic
• crest of the lower arch can be located further buccally than the upper which can lead to difficulties obtaining adequate occlusal relationship between 2 arches

Question 17

What modifications can we make when setting up for class III complete dentures?

Answer 17

• set the teeth edge to edge, no overbite or overjet
• inclining the anterior mandibular teeth lingually without encroaching the tongue space
• setting up the upper teeth slightly proclined without making unstable when anterior load is applied

Question 18

How should the maxillary central incisors be set in the occlusal rim?

Answer 18

the incisal edge of the central should be set on the level of the occlusal rim

Question 19

How should the maxillary lateral incisors be set on the occlusal rim?

Answer 19

the incisal edge of the lateral should be approximately 1mm higher than the central and the tip of the canine

Question 20

How should the maxillary canines be set on the occlusal rims?

Answer 20

the incisal edge of the canine should be at the same level as the central incisor

Question 21

How should the lower centrals be set on the occlusal rims?

Answer 21

• set 90 degrees to the occlusal plane
• incisal edge should form 1-2mm horizontal and vertical overlap with upper centrals

Question 22

How should the lower lateral incisors be set on the occlusal rims?

Answer 22

set at the same height as the centrals with the long axis slightly inclined

Question 23

How should the lower canines be set on the occlusal rims?

Answer 23

long axis should be slightly inclined almost 90
should be set prominent with height 2mm above the occlusal plane

Question 24

What is the curve of sphee ?

Answer 24

curvature which begins at the tip of the canines and follows the buccal cusp of tips of the premolars and molars when viewed from the side

Question 25

What is the curve of wilson and sphere of monson?

Answer 25

medio-lateral curvature of the occlusal plane of the posterior teeth

the purpose of this arch is to complement the paths of the condyles during movement o fthe mandible

Question 26

How should you choose your occlusal schemes for your dentures?

Answer 26

they should be based on previous occlusal methods and ridge form

(ridge form classifications Howell and Cawood classifications)

Question 27

What occlusal scheme would you choose for a patient with well formed ridges (Howell and cawood class III)?

Answer 27

more anatomical teeth

Question 28

What kind of occlusal scheme would you consider for someone with flatter ridges?

Answer 28

lower cusp height

Question 29

What is a balanced occlusion?

Answer 29

bilateral, simultaneous, anterior and posterior occlusal contact of teeth in centric and eccentric positions.

balanced occlusion in complete dentures us unique and does not occur naturally (in natural teeth)

therefore, there are 3 points of contact regardless of the mandibular position

Question 30

What is centric occlusion?

Answer 30

occlusion of the teeth when the mandible is in centric relation

Question 31

What is centric relation?

Answer 31

• this is when the condyles articulate in a posterior superior position againts the posterior clope of the articular eminence

Question 32

What is lingualised occlusion?

Answer 32

• the maxillary palatal cusps contact against the central fossa of the mandibular teeth
• buccal cusps of the madibular teeth do not contact the opposing maxillary teeth
• mandibular teeth are lingual to the alveolar ridge

Question 33

What are the advantages of a lingualised occlusion ?

Answer 33

• aesthetically pleasing
• provides efficient mastication
• less destruction to alveolar bone- less cusps= less chance the denture gets moved by side shift
• reduced number of occlusal contact easier to set up
• vertical forces are directed more centrally to the mandubular ridge creating less tilting, giving the denture more stability

Question 34

What is monoplane occlusion?

Answer 34

this concept assumes that the anterior posterior plane is parallel to the residual ridge

plane of occlusion is completely flat and level

No curve of spee or monson (no compensating curves) incorporated into set up

no vertical overlap of anterior teeth

very slight disocclusion in protrusion (balancing ramps)

Question 35

What is a patient instructed to do when using monoplane occlusion?

Answer 35

they are instructed not to incise the bolus

Question 36

What is an advantage of monoplane occlusion?

Answer 36

• does not allow lateral locking of teeth, allows freedom of movement

Question 37

Monoplane occlusion is ideal for…

Answer 37

flat or atropic ridges