Anterior Full Coverage Crowns Flashcards
Indications?
Aesthetic Broken down tooth Tooth-wear Trauma Atypical shade Hypoplastic condition Alter occlusion (Attachment dentures/ retainers for bridges)
Contraindications for crown?
Other more conservative options
Poor OH
Perio - not enough support
Very broken down
What can correcting occlusion achieve?
Increased VD -Dhal concept
Posterior teeth over erupt = correct occlusion
Types of anterior crown?
Metal ceramic
All porcelain: PJC, dentine bonded, high strength
What is a metal-ceramic crown for anterior teeth?
Metal core with ceramic veneer Heavy labial prep -1.5mm Lighter palatal prep - 0/7mm Less aesthetic due metal substructure - problem translucency Good bruxism case
What is porcelain jacket crown?
Oldest type of all-ceramic
Very brittle prior cementation
2mm porcelain around tooth - very destructive
Very strong
What is a dentine bonded crown?
All porcelain
Thin layer glass ceramic (feldspathic/ leucite) which relies on bonding to underlying structure
Light charger margin - 0,7mm (conservative)
Ideal minimally restoring teeth for aesthetic reason
What is pressed ceramic crown?
Strong core or full contour crown produced by pressing ceramic at high temp on die
What is castable ceramic?
Wax pattern of crown made - casted in glass-ceramic
Casting placed in ceramic oven
Crystallisation process gives stronger core
Core veneered w/ feldspathic porcelain = good aesthetic
What is a high strength ceramic core crown?
Alumina core formed using slip casting- thin and porous
Infiltrated with glass
Either pure alumina or zirconia
What is CADCAM?
New development
Crowns can be milled from single block porcelain
Reduce human error
Produce higher and more uniform quality
Can use material that would have been hard to use
What is an all porcelain crown?
Increasing popularity
Allows more conservation labial prep, more destructive palatal (1.2mm shoulder)
Better aesthetic due lack metal substructure
Indication for dentine-bonded crown?
Minimally restored teeth
Aesthetic paramount
Suitable occlusion
Indication for high-strength porcelain?
More heavily restored dentition
Aesthetic important
Indication metal-ceramic crown?
Heavily restored dentition
Heavier occlusion
Aesthetic less essential
