Removal prosthodontics

Question 1

what is direct retention and what is it provided by

Answer 1

• resistance to vertical displacement of the denture
• provided by clasps, guide planes, path of insertion and precision attachments

Question 2

what is indirect retention and what is it provided by

Answer 2

• resistance to rotational displacement of the denture
• provided by major connectors, minor connectors, rest seats, saddles and the denture base

Question 3

what are the types of upper major connector designs

Answer 3

full palatal coverage, mid-palatal strap, skeletal/horseshoe shaped, ring design

Question 4

what are the types of lower major connector designs

Answer 4

lingual bar, lingual plate, dental bar, kennedy bar design

Question 5

when is the re-organised approach used

Answer 5

when increasing the OVD or no index teeth present. This involves recording the occlusion in the retruded axis position/centric relation

Question 6

when is the conformative approach used

Answer 6

when the denture is conforming to the patients existing occlusion. Two or more contacting teeth must be present so that ICP is achievable. the occlusion is recorded in ICP

Question 7

what do you need to check in the metal try in

Answer 7

adaption, presence of sharp edges, the clasps are engaging the undercuts, for any laboratory-induced defects on denture bearing areas, the path of insertion

Question 8

what are the indications for copy dentures

Answer 8

• the patient has requested a spare set of dentures and is satisfied with the current dentures function and aesthetic
• staining of the current denture teeth
• worn teeth/overclosure
• fractured baseplate or denture teeth in an otherwise functional denture

Question 9

what are the risk of immediate dentures for a single tooth

Answer 9

• suboptimal immediate denture fit as secondary impressions not taken
• denture fit may worsen with time as the socket heals and bone remodels
• uunaesthetic appearance in high smile line cases as a result of gingival recession after healing

Question 10

what are the risks of denture additions

Answer 10

• the point of addition will be slightly weaker and prone to breakage
• the denture may not fit well
• possible unaesthetic appearance in high smile line cases
• limitation
• pt won’t have denture for short period

Question 11

what are the indications of overdentures

Answer 11

RCT teeth with significant tooth wear, MH precludes extractions, preservation of the bone is necessary, over implant abutment

Question 12

what are the advantages of overdentures

Answer 12

maintains bone around teeth, good transition psychologically for pts going from teeth to no teeth

Question 13

what are the disadavantages of overdentures

Answer 13

optimal OH required and so can need extraction if become carious or periodontally involved and new denture may be required