Inlays, onlays and veneers Flashcards
What are inlays
What are types
Intra-coronal restorations made in lab
Gold
Composite
Porcelain
What are the uses for inlays
Occlusal cavities
Occlusal/interproximal cavities
Replace failed direct restorations
When would an inlay be indicated
Premolars or molars
Occlusal restorations
Mesio-occlusal or disto-occlusal restoration
MOD (if kept narrow)
Low caries rate
Adv and DisAdv of inlays (vs direct restorations)
Advantages (vs direct restorations)
-Superior materials and margins
-Won’t deteriorate over time
Disadvantages
-Time
-Cost
What should the inlay prep of each material be like
Caramic
- 1.5-2mm isthmus width
- 1.5mm depth
- 1mm shoulder or chamfer margin
- No bevels in cavosurface margins
Gold
- 1mm isthmus width
- 1.5mm depth
- 0.5mm chamfer margin
-15-20 bevel upper 1/3 of isthmus wall
4-6 tapered walls
What is the inlay cementation
Ceramic inlays Weak when not cemented & if occulsion not checked may fracture
Ceramic inlays
Weak when not cemented
Caramic
-NX3 (Nexus)
-ABC
-RelyX Unicem self adhesive resin cement
Gold
-AquaCem
-Panavia
-RMGI (RelyX)
What are onlays and what are the types
Extra-coronal restorations made in lab
Types
Gold
Composite
Porcelain
What are the indications for onlays
Sufficient occlusal tooth substance loss
-Buccal and/or palatal/lingual cusps remaining
Remaining tooth substance weakened
-Caries
-pre-existing large restoration (MODs with wide isthmuses)
When are Cast metal inlays/onlays preferable to amalgam
Higher strength needed
Significant tooth recontouring required
What are the uses of onlays
Tooth wear cases
Increase OVD
Fractured cusps
Restoration of root treated teeth
Replace failed direct restorations
What is the tooth prep of onlays
Dont make isthmus wide/narrow
4-6 tapered walls and Flat pulpal floor at even-depth(Approx. 1.5mm)
Occlusal reductions:
Porcelain
-Non working cusp – 1.5mm reduction
-Working cusp – 2mm reduction
Gold:
-Non working cusp – 0.5mm reduction
-Working cusp – 1mm reduction
Proximal box (if required): 1mm
Margins:
-Porcelain 1mm shoulder or chamfer
-Gold 0.5mm chamfer
Same with inlays with cavosurface margin
What is the only cementation
Ceramic onlays Weak when not cemented and if you Don’t check occlusion it May fracture
Adhesive systems
-NX3 (Nexus)
-ABC
-RelyX Unicem self adhesive resin cement
Gold inlays
-AquaCem
-Panavia
-RMGI (RelyX)
What is veneers and what are the types
A laminate veneer is a thin layer of cast ceramic that is bonded to the labial or palatal surface of a tooth with resin
Types
Ceramic
Composite
Gold
What are the indicationns for veneers
Improve aesthetics
Change teeth shape
Correct pag shaped laterals
reduce or close prox. sapces and diastemas
Align labial surfaces of instanding teeth
With veeners what types of discoloration can it solve
Intrinsic:
Non-vital teeth
Ageing
Trauma
Medications (tetracycline)
Fluorosis
Hypoplasia or hypomineralisation
Amelogenesis imperfecta
Erosion and abrasion
Extrinsic
Staining not amenable to bleaching
