Identification & Correction Identification & Correction of common impression of common impression

problemsproblems Dr. M.K.PATELDr. M.K.PATEL

BDS(WALES).MFGDP(UK).RCS(Eng) Dip BDS(WALES).MFGDP(UK).RCS(Eng) Dip Implant. MSc Implantology Implant. MSc Implantology

Common ComplicationsCommon Complications Marginal detailsMarginal details

BubblesBubbles

TearsTears

PitsPits

VoidsVoids

Marginal DetailMarginal Detail

Most common complaint from the Most common complaint from the technician is inadequate marginal detailtechnician is inadequate marginal detail

Will result in open margins and inadequate Will result in open margins and inadequate fitfit

Internal BubblesInternal Bubbles

As a result of fluid accumulation As a result of fluid accumulation Air entrapment Air entrapment Bubbles affect long term success of Bubbles affect long term success of looting agentlooting agent2 stage wash impression technique can 2 stage wash impression technique can cause difficulty in seating cause difficulty in seating

How to a avoid tearHow to a avoid tear

Flushing & drying of prep prior to Flushing & drying of prep prior to impressionimpression

Use an intra oral tip into the deepest part Use an intra oral tip into the deepest part of the prep & extrude the light body of the prep & extrude the light body material making sure the tip is in the material making sure the tip is in the material, this will force air out of the material, this will force air out of the impressionimpression

Marginal tearMarginal tear

Caused by incomplete setting of materialCaused by incomplete setting of material

Not removing all the old impression Not removing all the old impression material prior to impressionmaterial prior to impression

If the syringe material is to thick then you If the syringe material is to thick then you must retract more retraction cord must retract more retraction cord

Drags & PullsDrags & PullsMost common complication with material i.e. putty or heavy Most common complication with material i.e. putty or heavy

body material body material A pull results when a material creates a fold at A pull results when a material creates a fold at the gingival aspect the gingival aspect These deformities lead to D3 bonding of the tray These deformities lead to D3 bonding of the tray and sliding into position and sliding into position Impression material beyond it’s working timeImpression material beyond it’s working timeFailure for the impression material to adapt to Failure for the impression material to adapt to the teeththe teethExceeding materials prior 2 intra-oral insertion Exceeding materials prior 2 intra-oral insertion Insertion of tray in 1 direction Insertion of tray in 1 direction

How to avoid Drags & PullsHow to avoid Drags & Pulls

Remove intraproximal impression material, Remove intraproximal impression material, so the impression can be re-inserted so the impression can be re-inserted without interferencewithout interferencePlace the light body over the whole Place the light body over the whole impression impression Impression should be filled where the Impression should be filled where the teeth areteeth areDrags are usually incorrect able Drags are usually incorrect able

Tray Selection Tray Selection Tray should not contact the soft tissues, only at Tray should not contact the soft tissues, only at the basethe baseIf the plastic tray needs to be bent you could use If the plastic tray needs to be bent you could use an alcohol tort to bend the trayan alcohol tort to bend the trayAn adhesive should be usedAn adhesive should be usedMust make sure the primary putty adders well Must make sure the primary putty adders well prior to taking the second impressionprior to taking the second impressionDry the putty and the teeth before second stageDry the putty and the teeth before second stageLatex can affect the putty so an alternative is Latex can affect the putty so an alternative is used used

Inadequate material mixingInadequate material mixing

Make sure material has uniform colour and Make sure material has uniform colour and no striking no striking

Striking is most common with impressions Striking is most common with impressions