Anterior Full Coverage Crowns Flashcards
Indications for anterior crowns
Aesthetics Broken down teeth Toothwear Trauma Atypical shape/hypopkasia Milled crowns and denture attachment purposes Retainers for cantilever bridgework Alter occlusion
Contraindications for anterior crowns
Other more conservative options are viable
Poor OH
Very broken down tooth with caries extending subgingivally
Periodontal conditions lack of bone support
Types of anterior crowns
Porcelain types
Metal ceramic
All porcelain
Porcelain jacket
Dentine bonded
High strength porcelain
CAD CAM use
Metal ceramic crowns
Prep measures?
Most popular porcelain Metal core and ceramic veneer Heavy labial prep 1.5mm Lighter palatal prep 0.7mm Less aesthetic due to metal Option for metal backings Good for bruxism
Porcelain jacket crown
Oldest type of all ceramic
Very brittle
Not very strong
Dentine bonded crowns
Thin layer of glass ceramic
Relies on bonding to underlying tooth structure of strength
Light chamfer margin - conservative preparation 0.7mm
Ideal for minimally restored teeth requiring crowns for aesthetics
Pressed ceramics
Strong core or full contour crown is produced by pressing it at high temp
Castable ceramics
Dicor system
Wax pattern of crown was made - casted in glass ceramic material
Casting placed in ceramic oven and left for several hours
Crystallisation to produce stronger core
Core veneered with porcelain to achieve good aesthetics
All porcelain crowns - structure
Glass infiltrated high strength ceramic core systems - alumina core - porous core and infiltrated with lass - dense core produced
High strength core ceramics - pure alumina and zirconia
All porcelain crowns - CAD/CAM tech
Crown milled from single porcelain block
Reduced human error
Chair side CAD/CAM
Produce higher and more uniform quality material
All porcelain crowns demand
Increasing demand
More conservative labial prep but more destructive palatal
More aesthetic due to lack of metal and no metal showing at margin
All porcelain crown exception
Some can be bonded to underlying tooth
Shoulder must be rounded with no sharp angles
When to use DBC
Minimally restored tooth
crown
Aesthetics paramount Suitable occlusion
When to use High Strength porcelain
More heavily restored tooth Aesthetics more important
Metal ceramic crown
More heavily restored tooth Heavier occlusion (eg bruxism) Aesthetics less essential
