Restorative Flashcards
TSL: BEWE scores
0- no tsl
1- initial loss of tooth surface
2-<50% tsl
3->50% tsl
BEWE score management: <2
Risk level= none
Routine maintenance & observation.
Repeat at 3yr intervals.
BEWE score management: 3-8
Risk level= low
OH + dietary assessment & advice, routine maintenance & observation.
Repeat at 2yr intervals.
BEWE score management: 9-13
OH + dietary assessment & advice, identify main etiological factors for tissue loss & develop strategies.
Consider fluoridation measures or other strategies to increase resistance of tooth surfaces.
Avoid placement of restorations & monitor erosive wear with study casts, photos or silicone impressions.
Repeat at 6-12 month intervals
BEWE score management: >14
OH + dietary assessment & advice, identify main etiological factors for tissue loss & develop strategies.
Consider fluoridation measures or other strategies to increase resistance of tooth surfaces.
Avoid placement of restorations & monitor erosive wear with study casts, photos or silicone impressions.
+ consider special care that may involve restorations.
Repeat at 6-12 month intervals
Crown types and preparations…
Metal: 0.5-0.7mm chamfer, 1mm occlusal reduction
PFM: 1-1.5mm shoulder, 2mm occlusal reduction
Zirconia: 1mm shoulder, 1.5mm occlusal reduction
All ceramic: 2mm shoulder + occlusal reduction
Explain C factor…
Ratio of bonded surface area to free surface area…
A class 1 with a ratio of 5 bonded surfaces to 1 unbonded has the highest c factor.
A comp veneer has a ratio of 1:1 so the lowest c factor
This means if it has a high c factor & the restorative material is added in one go, it will put sufficient stress on the restorative material and increase the likelihood of post-operative pain and sensitivity & early failure.
Whereas for the comp veneer the shrinkage of 1.5-2.5% will dissipate within the restoration and not concentrated at the tooth-restoration interface
