Bridgework 3 Flashcards
what occlusal information is important when doing an examination for a potential bridgework patient?
- intraoral exam
- studycast (facebow mounted)
- incisal classification
- canine guided or group function
- opposing tooth overerupted?
- will bridge interfere with current occlusal
- parafunction signs present? (attrition etc)
what features of an abutment/retainer do you need to evaluate to assess suitability?
- root configuration
- angulation/rotation of retainer/abutment
- periodontal health
- risk of pulp damage
- bonding area/quality of enamel
what is the function of a pontic?
- restore appearance of missing tooth
- stabilise the occlusion
- improve masticatory function
Talking about ridge surface of a pontic,
what is the difference of wash-through vs dome-shaped and where would you use each one?
Wash-through:
- no contact with soft tissue
- functional > appearance
- lower molar area
Dome-shaped:
- lower incisor, premolar, upper molars
- touches soft tissue
what are the types of materials for conventional bridges?
- gold
- nickel/cobalt chrome
- stainless steel
- metal ceramic
- all ceramic (zirconia, Lithium disilicate aka E-max)
what are the steps of preparation in conventional bridgework?
1) mounted study models
2) consider diagnostic wax up and custom impression tray
3) request lab to construct vacuum formed stent
4) select shade
5) lab made stent or make pre-op putty for PROVISIONAL bridge
6) occlusal/incisal reduction
7) prep teeth, aim for parallelism
what type of cement is aquacem and what type of bridgework is it used for?
GI Luting cement - all metal conventional bridgework
what cement is used for all ceramic crowns?
NEXUS kit (duel cure resin cement)
whats the problem with distal cantilever crowns?
- concern that occlusal forces on pontic will provide leverage forces on retainer causing it to tilt
what is the common rule of longevity when it comes to bridgework?
if it lasts up to 5 years, most likely pt will make it to 10 years with it
