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BDS2 RPD > Mouth Preparation and Master Impressions > Flashcards

Mouth Preparation and Master Impressions Flashcards

1
Q

What are the 4 phases in a restorative treatment plan?

A
  • Immediate treatment
  • Hygienic (preparatory phase)
  • Corrective (reconstructive phase)
  • Maintenance
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2
Q

What are the clinical stages of partial denture construction? (9 points)

A
  • Primary impressions
  • Primary jaw registration (if required)
  • Mounted, surveyed casts
  • Design denture
  • Tooth preparation and master impressions
  • Jaw registration
  • Trial
  • Delivery
  • Review
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3
Q

What are the possible treatments that can be given for mouth preparation for an RPD? (6 points)

A
  • Initial prosthetic treatment
  • Surgery
  • Periodontal treatment
  • Orthodontic treatment
  • Fixed prosthodontic treatment and endodontics
  • Tooth preparation
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4
Q

What are examples of initial prosthetic treatments? (4 points)

A
  • Repairs and additions
  • Temporary relines
  • Occlusal adjustment
  • Treatment of denture stomatitis
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5
Q

What is torus palatinus?

A

A harmless, painless bony growth on the roof of the mouth. The mass appears in the middle of the hard palate and can vary in size and shape

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6
Q

What are examples of pre-prosthetic surgery that can be done as mouth preparation for RPD’s? (4 points)

A
  • Remove retained roots/unerupted teeth
  • Remove pathology
  • Improve contours of edentulous areas - by reducing bony prominences and hyperplastic soft tissues
  • Eliminate prominent fraenal attachments
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7
Q

What are the possible periodontal treatments for mouth prep for RPD’s? (5 points)

A
  • Establish health in periodontal tissues
  • Assess patient motivation
  • Detailed instruction in oral hygiene procedures
  • Scaling and root planning
  • Periodontal surgery
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8
Q

Why might someone be given orthodontic treatment as mouth prep for RPD’s? (2 points)

A
  • To optimise space

- To optimise abutment alignment

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9
Q

Which types of patients may be given ortho treatment as tooth prep prior to RPD’s? (3 points)

A
  • Cleft patients
  • Hypodontia patients
  • Periodontal patients
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10
Q

What can fixed pros treatment prior to RPD making establish and facilitate? (3 points)

A
  • Should follow denture design and precede denture construction
  • Establishes clinical integrity of teeth before master impressions recorded
  • Facilitates provision of crowns (and/or teeth) with guide planes, rest seats etc for specific denture design
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11
Q

Why might you need to do tooth preparation prior to fitting an RPD?

A

To avoid interference of the denture components with the occlusal balance that was there when you started

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12
Q

What is possible to do with tooth preparation prior to fitting an RPD? (4 points)

A
  • Provide rest seats
  • Establish guide surfaces
  • Modify unfavourable survey lines
  • Create retentive areas
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13
Q

What type of instruments are used in tooth preparation and what are they used for? (4 points)

A
  • Rotary diamond instruments = used to shape enamel surfaces
  • Special burs, stones and abrasive impregnated rubber wheels and points = used to smooth and polish the resultant roughened enamel surface
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14
Q

What are the advantages of rest seat preparation? (3 points)

A
  • Produce favourable tooth surface support
  • Prevent interference with occlusion
  • Reduce prominence of the rest
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15
Q

Rest seats on anterior maxillary teeth have a well developed cingulum which allows prep to stay within enamel. What instrument would you use to prepare this rest seat?

A
  • A cylindrical diamond stone with a rounded tip
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16
Q

Rest seats on anterior mandibular teeth the lingual surface is too vertical and the cingulum is too poorly developed to avoid penetratin g enamel. In this case, what type of rest seat would be used?

A
  • An incisal rest seat (not done much these days)
17
Q

What are alternatives to using incisal rests on anter ior mandibular teeth? (2 points)

A
  • Produce a rest seat in composite applied to the cingulum area
  • Bond a cast metal cingulum to the tooth
18
Q

What should occlusal rest seats on posterior teeth be like? (3 points)

A
  • Reduce marginal ridge
  • Rests should be saucer shaped to allow some horizontal movement and dissipation on occlusal forces
  • Rest seats should be deep enough to allow a rest of at least 1mm thick
19
Q

If there is no space occlusally on posterior teeth for a clasp to extend buccally from the occlusal rest, what should be done?

A
  • The preparation must be extended as a channel on to the buccal surface
20
Q

What are guide planes?

A
  • They are 2 or more parallel axial surfaces on abutment teeth, which limit the path of insertion of a denture. They may occur naturally, but more often need to be prepared
21
Q

What do guide planes provide? (4 points)

A
  • Increased stability
  • Reciprocation
  • Prevention of clasp deformation
  • Improved appearance
22
Q

What are the measurement requirements for guide planes? (2 points)

A
  • Guide surface should extend vertically 3mm but be kept as far from the gingival margin as possible
  • Not more than 0.5mm enamel should be removed
23
Q

How can you create retentive areas on a tooth for tooth prepa ration?

A
  • Can be created by addition of acid etched composite. Need a broad area of attachment of the restoration to the enamel
  • Use ultrafine or hybrid composites
24
Q

What do you need to consider in the clinical stage of mater impression taking? (3 points)

A
  • Obtain an accurate impression of the denture-bearing area
  • Use individual tray
  • Use an appropriate material
25
Q

What do you need to produce in the laboratory stages of mater impression taking? (5 points)

A
  • Produce casts
  • Produce casting (if Co/Cr base)
  • Produce record blocks
  • Produce trial denture
  • Produce finished denture
26
Q

What are individual trays made on and what material are they made with?

A
  • Made on primary casts

- Made with Heat-cured or light cured acrylic

27
Q

What are 3 examples of impression materials used for master impressions?

A
  • Alginate
  • Polyvinylsiloxane e.g. Extrude (medium body)
  • Polyether e.g. Pentamix

… plus corrective adhesive

28
Q

After taking the master impression what should you remember to do?

A

Remember to write up the laboratory card as they need to know what to do for the next appointment

BDS2 RPD (13 decks)

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