data transfer notes

Question 1

the trial dentures

Answer 1

• Artificial teeth set in wax to the jaw registration
• The jaw registration provides the vertical and horizontal relationships of the maxilla and mandible

Question 2

information required to set teeth

Answer 2

The position of the teeth relative to:

• The residual alveolar ridges
  
  • Horizontal position
  • Vertical position

Casts mounted in Retruded Contact Position (RCP) on an articulator using information measured from the pt

• OVD
• centre line
• canine line
• 3D template (occlusal rims trimmed by dentist to support lips, tngue and cheeks)

Question 3

occlusal vertical dimension

Answer 3

distance between the jaws with teeth in occlusion

Question 4

centre line

Answer 4

• Centre of the patients mouth (symmetrical with face)

Question 5

canine line

Answer 5

(line extended from the inner canthus of the eye)

Question 6

methods of transferring information from occlusal rims to casts (6)

Answer 6

• Take a putty register of the anterior contour
• Use anatomical landmarks to assist tooth position
• Use an Alma case to assist tooth position
• Take an impression of the patient’s existing denture / pour cast
• Ask the patient for a photograph when they had their natural teeth
• Take an impression of family members dentition if appropriate

Question 7

what to assess about tooth position at trial denture stage (5)

Answer 7

• Aesthetics
• Lip support
• Speech
• Occlusal plane
• Check centric relation

Question 8

prescription card for trial dentures

Answer 8

in addition to instructions to the technician regarding this stage, the reverse of the card must be completed.

Question 9

how to transfer centre line data

Answer 9

• The central incisor teeth are set on either side of the centre line
• The central occlusal plane indicates where the incisal level of the tooth will be
• If the blocks have been trimmed supporting the lips – the angle to which the teeth should be set is indicated

Question 10

importance of occlusal rims in data transfer (6)

Answer 10

• The patient’s centre line – the centre of the mouth/face
• The central incisor plane
• The occlusal plane ( the central incisors are at a different level to the laterals and canines.
• The extent of the patient’s smile line (lip line)
• The canine line (buccal corridor)
• A 3D template to set anterior teeth – providing the occlusal rims are trimmed correctly.

The technician can transfer these lines onto the surface of the casts and plaster mounting

Question 11

recording the occlusal plane

Answer 11

The centre line is extended onto the surface of the upper and lower cast.

Dividers set at an arbitrary value are used to record the position of the occlusal plane. It is important to record this value.

Question 12

occlusal plane a.k.a

Answer 12

central incisal plane

Question 13

how to use he incisive papilla in data transfer

Answer 13

1. Central line
2. Labial surface of central incisors
3. Centre of canine

A guide to the position of anterior teeth is the taken from the distal of the papilla. The labial aspect of the central incisors is approximately 10 mm from this point.

This is an indicator only.

What does the measurement depend on?

• A line extended horizontally from the distal of the incisive papilla at right angles to the median saggittal plane will indicate the position of the centre of the canine.

Question 14

data transfer information for setting posterior teeth

Answer 14

The line is transferred to the artwork of the cast to display the ridge contour when the base is covering the ridge.

Landmarks can also be used to assist the positioning of posterior teeth.

• Although this is dealt with in more detail elsewhere – the position of the centre of the lower ridge is marked as shown.

In addition, the contour of the ridge is drawn onto the wall of the cast.

An indicator for the height of the occlusal plane can be taken from the position of the retro-molar pad – the occlusal plane should not be above the retro-molar pad. The tongue should be above the level of the occlusal plane to control food bolas on the surface of the teeth

Question 15

tongue position relative to occlusal plane

Answer 15

should be above the level of the occlusal plane to control food bolas on the surface of the teeth

Question 16

occlusal plane position relative to retromolar pad

Answer 16

the occlusal plane should not be above the retro-molar pad.

Question 17

the Alma gauge

Answer 17

• can be used on the upper or lower denture or with occlusal rims.
• simple device assists is the communication of information from patient via dentist to technician.
  
  • used to determine the vertical and horizontal position of anterior teeth relative to a point on the denture base (e.g. incisive papilla)

Question 18

additional information which can be used to data transfer/position teeth

Answer 18

photos or casts of existing dentures

Question 19

A-A

Answer 19

centre line

The central incisor teeth are set on either side of the centre line

Question 20

B-B

Answer 20

occlusal plane (central incisal plane)

The centrals are set 1 mm below the line with the lateral and canine teeth set on the line

Question 21

C-C

Answer 21

residual alveolar ridge contour

provides a guide to the length of the occlusal table

Teeth should not be set on an incline to assist occlusal balance and denture stability

Question 22

D-D

Answer 22

canine line