Inlays, Onlays and Veneers Flashcards
What is an indirect restoration?
A restoration fabricated outside the mouth by a technician in a laboratory
Give examples of indirect restorations
- crowns
- bridges
- posts and cores
- inlays and onlays
- veneers
What are the advantages of chair side indirect restorations?
- quick
- no temporary needed
What is an inlay?
- an intra-coronal restoration made outside the mouth
What materials can be used for inlays?
- gold
- composite
- porcelain
What cases would an inlay be used?
- occlusal cavities
- occlusal/interproximal caries
- replacement of failed direct restorations
What are the indications for an inlay?
- premolars or molars
- occlusal restorations
- mesio-occlusal or disto-occlusal restoration
- MOD if kept narrow
- low caries rate
What are the advantages of using an inlay over a direct restoration?
- superior materials and margins
- won’t deteriorate over time
What are the disadvantages of using an inlay over a direct restoration?
- higher cost
- takes more time
Give the dimensions for the preparation of a ceramic inlay
- 1.5-2mm isthmus width
- 1.5mm depth
- at least 1mm shoulder or chamfer margin
Give the dimensions for a gold inlay prep
- 1mm isthmus width
- 1.5mm depth
- 0.5 mm chamfer margin
briefly outline the temporisation and impression for an inlay
- take impressions and occlusal records
- fit temporary restoration
- send impressions and occlusal records to lab for fabrication of restoration
What would you include on a lab prescription card for an inlay?
- pour impressions
- mount casts
construct restoration:
- tooth FDI notation
- material
- thickness
- shade
- characteristics
What cements can be used for a gold inlay?
- aquacem
- panavia
- RMGI (RelyX)
What materials can be used to cement ceramic inlays?
- NX3 (nexus)
- ABC
- Rely X unicem self adhesive cement
What is an onlay?
- an extra coronal restoration made in lab
- like inlays but with cuspal coverage
- height of cusps should be reduced during preparation
Give the indications for an onlay
- sufficient occlusal tooth substance loss
- buccal and/or palatal/lingual cusps remaining
- remaining tooth substance weakened due to caries, pre existing restoration
- MOD with wide isthmus
When would a cast metal onlay or inlay be preferable to amalgam?
- Higher strength needed
- significant tooth recontouring required
give the cases when an onlay could be used
- tooth wear to increase OVD
- fractured cusps
- restoring root treated teeth
- replacement of failed direct restorations
What occlusal reductions would you make for a porcelain onlay preparation?
- non working cusp = 1.5mm
- working cusp = 2mm
- proximal box if required = 1mm
What occlusal reductions would you make for a gold onlay preparation?
- non working cusp = 0.5mm
- working cusp = 1mm
- proximal box if required = 1mm
What dimensions are required for the margins for a porcelain onlay prep?
1mm shoulder or chamfer
What dimensions are required for the margins for a gold onlay prep?
0.5mm chamfer
Outline what you would do during a second onlay or inlay appointment
- remove temporary restoration
- isolate, clean and dry prepared tooth
- try in restoration, assess fit, adaptation, occlusion etc
- address any problems if any
- cement
- minor occlusal adjustments if necessary
