Prosthetics - Impressions, Tooth Preps &
Medical Devices
Impression Techniques & Soft Tissue
Management (2) Elastomeric Impression
Prosthetics - Impressions, Tooth Materials
Preps & Medical Devices Principles of Tooth
Preparation Shade
Selection in Dentistry
Medical Devices
Impression Techniques & Soft Tissue
Management
· Establish health for clinical success
How do we manage
periodontal tissues when · Design restorations to allow control of plaque
planning extra coronal · Avoid iatrogenic damage
restorations?
· Prove motivation
Why must the gingiva be
healthy before embarking on · Stable gingival margin - free of swelling or bleeding
extra-coronal restorations? · Facilitates preparation & impression taking
· OHI & motivation
How do we establish a healthy · Remove PRFs - calculus, overhanging restorations,
oral environment? provide temporary crown (chairside or lab made)
· There should be no bop or marginal bleeding
How must a restoration be to facilitate plaque removal & discourage plaque accumulation
,designed for success?
· Margins
What must we consider when · Material
designing restorations? · Embrasure spaces
· Contour
1 - supragingival
Margin placement can either 2- equigingival
be... 3- subgingival
In what % of people does 33%
the gingival aspect of their
anterior teeth not show
whilst smiling?
· Caries into gingival crevice
Ideally, we do not want to · Increase retention
place a subgingival margin. · Existing restoration is subgingival
How do we know when to
· Dentinal hypersensitivity
place a subgingival margin
· Aesthetic demands of pt & dentist
though?
· Subgingival fracture
· Optimal pre prosthetic gingival health
· Minimal gingival trauma
What can we do to minimise the · Careful use of retraction cord
effect of subgingival margin · Sulcus impression after impression removal
placement?
· Well fitting properly contoured provisional restorations
· Post placement observation of hygiene measures
, · Contour must allow for optimum plaque control
Why must we be careful when · Excessive bulk in the gingival third leads to plaque
creating the restoration accumulation. It does not protect the gingivae as
contour? previously thought.
· In essence, precise preparation of the tooth is required.
To obtain an accurate, dimensionally stable, fully supported
What is the purpose of
impression of the prepared teeth and associated soft
impressions?
tissues
· Choice of impression tray
· Choice of handling of the impression material
· Control of the field
What steps need to be
· Management of the patient
followed to ensure a good
· Accurate assessment of the impression
impression & outcome?
· Handling of the completed impression - labelling, disinfection,
transport, storage
· Impression casting
· Clear margin must be visible on impression ALL THE WAY ROUND your
What soft tissues must we see on
preparation
the impression?
· Ideal - supragingival
· Subgingival will require some soft tissue management
· Retraction of tissue
- Cord (single/twin)
- Paste
· Removal of tissue
How can we manage soft tissues
- Rotary curettage
during impression taking?
Medical Devices
Impression Techniques & Soft Tissue
Management (2) Elastomeric Impression
Prosthetics - Impressions, Tooth Materials
Preps & Medical Devices Principles of Tooth
Preparation Shade
Selection in Dentistry
Medical Devices
Impression Techniques & Soft Tissue
Management
· Establish health for clinical success
How do we manage
periodontal tissues when · Design restorations to allow control of plaque
planning extra coronal · Avoid iatrogenic damage
restorations?
· Prove motivation
Why must the gingiva be
healthy before embarking on · Stable gingival margin - free of swelling or bleeding
extra-coronal restorations? · Facilitates preparation & impression taking
· OHI & motivation
How do we establish a healthy · Remove PRFs - calculus, overhanging restorations,
oral environment? provide temporary crown (chairside or lab made)
· There should be no bop or marginal bleeding
How must a restoration be to facilitate plaque removal & discourage plaque accumulation
,designed for success?
· Margins
What must we consider when · Material
designing restorations? · Embrasure spaces
· Contour
1 - supragingival
Margin placement can either 2- equigingival
be... 3- subgingival
In what % of people does 33%
the gingival aspect of their
anterior teeth not show
whilst smiling?
· Caries into gingival crevice
Ideally, we do not want to · Increase retention
place a subgingival margin. · Existing restoration is subgingival
How do we know when to
· Dentinal hypersensitivity
place a subgingival margin
· Aesthetic demands of pt & dentist
though?
· Subgingival fracture
· Optimal pre prosthetic gingival health
· Minimal gingival trauma
What can we do to minimise the · Careful use of retraction cord
effect of subgingival margin · Sulcus impression after impression removal
placement?
· Well fitting properly contoured provisional restorations
· Post placement observation of hygiene measures
, · Contour must allow for optimum plaque control
Why must we be careful when · Excessive bulk in the gingival third leads to plaque
creating the restoration accumulation. It does not protect the gingivae as
contour? previously thought.
· In essence, precise preparation of the tooth is required.
To obtain an accurate, dimensionally stable, fully supported
What is the purpose of
impression of the prepared teeth and associated soft
impressions?
tissues
· Choice of impression tray
· Choice of handling of the impression material
· Control of the field
What steps need to be
· Management of the patient
followed to ensure a good
· Accurate assessment of the impression
impression & outcome?
· Handling of the completed impression - labelling, disinfection,
transport, storage
· Impression casting
· Clear margin must be visible on impression ALL THE WAY ROUND your
What soft tissues must we see on
preparation
the impression?
· Ideal - supragingival
· Subgingival will require some soft tissue management
· Retraction of tissue
- Cord (single/twin)
- Paste
· Removal of tissue
How can we manage soft tissues
- Rotary curettage
during impression taking?
