Bridgework 2

Question 1

what are some local indications for bridgework?

Answer 1

• big teeth
• heavily restored teeth
• favourable abutment angulations
• favourable occlusion

Question 2

what are some general contra-indications for bridgework?

Answer 2

• uncooperative pt, poor OH
• high caries
• perio disease
• medical history contraindications
• large pulps (conventional bridge)

Question 3

what are the ADVANTAGES of a conventional fixed-fixed bridge?

Answer 3

• robust design
• maximum retention + strength
• can be used in longer spans of saddle areas
• lab construction is easy

Question 4

what are the DISADVANTAGES of a conventional fixed-fixed bridge?

Answer 4

• preparation difficult (parallel preparations needed)
• prep must be minimally tapered ~7*
• must have a common path of insertion for the abutment teeth
• removal of tooth tissue (danger to pulp)

Question 5

what are the advantages of a conventional cantilever bridge over a fixed-fixed?

Answer 5

• conservative design (compared to fixed-fixed)
• lab construction easy
• no need to ensure multiple teeth preps are parallel

Question 6

what are the disadvantages of conventional cantilever bridges?

Answer 6

• can only fill a short span of saddle area
• rigid
• mesial cantilever preferred (Pontic is mesial)

Question 7

what is a fixed-moveable bridge?

Answer 7

a type of bridge with rigid connector distal end of pontic and moveable connector mesially of pontic (allows some vertical movement at the mesial abutment tooth)

Question 8

what are ADVANTAGES of conventional fixed-moveable bridges?

Answer 8

• preparation dont require a common path of insertion
• each prep designed to be retentive independent of others
• more conservative tooth tissue
• allows minor tooth movement
• may be cemented in 2 parts

Question 9

what are DISADVANTAGES of conventional fixed-moveable bridges?

Answer 9

• length of span limited
• lab construction more complicated
• possible difficulty in cleaning beneath moveable joint
• cant provide provisional bridge

Question 10

what is a hybrid bridge?

Answer 10

one retainer = conventional prep
other = minimal prep/adhesive/resin retained/bonded

Question 11

what is a spring cantilever bridge?

Answer 11

a cantilever bridge where
1 pontic attached to the end of a metal arch running across palate connecting to a retainer elsewhere on the arch

Question 12

what factors are important to consider when evaluating abutment teeth?

Answer 12

• must be able to withstand forces previously directed to the missing teeth
• supporting tissues free of disease/perio
• Crown to root ratio - optimum 2:3