journal review / orthodontic courses by indian dental academy
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Journal - ReviewJournal - ReviewThe ocular impression: Review of literature and presentation of an alternate techniqueThe ocular impression: Review of literature and presentation of an alternate technique..
INDIAN DENTAL ACADEMY
Leader in continuing dental education www.indiandentalacademy.com
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Impressions in Impressions in ocular ocular
prosthesisprosthesisThe direct impression / External The direct impression / External ImpressionImpressionImpression with stock ocular trayImpression with stock ocular trayStock ocular tray modifications Stock ocular tray modifications Impression with custom ocular trayImpression with custom ocular trayImpression using stock ocular Impression using stock ocular prosthesisprosthesisOcular prosthesis modificationOcular prosthesis modificationWax scleral blank technique Wax scleral blank technique www.indiandentalacademy.com
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Direct impression /external Direct impression /external impressionimpression
Low viscosity alginate or reversible Low viscosity alginate or reversible hydrocolloid injected directly in to the hydrocolloid injected directly in to the socket.socket.
A rigid stock tray is used.A rigid stock tray is used.
Stone mold is made from the impression Stone mold is made from the impression and wax is poured in to this mold.and wax is poured in to this mold.
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Impression with stock Impression with stock ocular trayocular tray
Most common Most common techniquetechnique
Proposed by Proposed by AllenAllen and and WebsterWebster
It has a hollow It has a hollow stemstem
perforatedperforated
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Stock ocular tray Stock ocular tray modificationsmodifications
MaloneyMaloney modified by placing 3 channels modified by placing 3 channels on the superior edgeon the superior edge
Engelmeier Engelmeier suggested Ticonium stock suggested Ticonium stock traystrays
Sykes,Sykes, Essop,Essop, and and Veres Veres advocated the advocated the use of modeling plastic impression use of modeling plastic impression compoundcompound
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Stock ocular prosthesisStock ocular prosthesis
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Impression with custom Impression with custom ocular trayocular tray
Suggested by Suggested by MillerMiller
Preparation of a custom ocular tray Preparation of a custom ocular tray using exising prosthesis or wax shell using exising prosthesis or wax shell
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Ocular prosthesis Ocular prosthesis modificationmodification
Suggested by Suggested by ChalianChalian Smith Smith suggested relining of the stock suggested relining of the stock
prosthesis with korrecta wax No.4prosthesis with korrecta wax No.4 Ow Ow and and AmrithAmrith advocated use of a advocated use of a
tissue conditioner as a reline tissue conditioner as a reline materialmaterial
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Wax scleral blank Wax scleral blank techniquetechnique
McKinstryMcKinstry suggested compression suggested compression impression technique- preparation of impression technique- preparation of wax pattern based on the examination wax pattern based on the examination of the site.of the site.
SchneiderSchneider suggested obtaining wax suggested obtaining wax blank by duplicating the patient’s blank by duplicating the patient’s conformer.conformer.
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PVS cope and indexed cast with PVS cope and indexed cast with existing prosthesis in placeexisting prosthesis in place
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Mold filled with chemical – cure Mold filled with chemical – cure polymethyl methacrylatepolymethyl methacrylate
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Perforated acrylic resin trayPerforated acrylic resin tray
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Shortened 5ml syringeShortened 5ml syringe
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Custom tray fitted with syringe Custom tray fitted with syringe tiptip
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Tray with screwed syringe Tray with screwed syringe barrelbarrel
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The resulting impressionThe resulting impression
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Impression suspended in Impression suspended in a cupa cup
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The wax scleral pattern is The wax scleral pattern is removed from the alginate removed from the alginate
moldmold
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Discussion Discussion Advantages- improved fit, mobility, Advantages- improved fit, mobility,
and estheticsand esthetics
Disadvantages – increased Disadvantages – increased fabrication time, and cost.fabrication time, and cost.
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Conclusion Conclusion
Numerous impression and fitting Numerous impression and fitting
methods exist. Effectiveness and methods exist. Effectiveness and
desirability often depend on the patient’s desirability often depend on the patient’s
presentation, operator experience, and presentation, operator experience, and
materials and equipment available.materials and equipment available.
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Cross referencesCross references Maxillofacial Prosthetics Maxillofacial Prosthetics
multidisciplinary practice by Varoujan multidisciplinary practice by Varoujan A.Chalian, pg 294 – 297.A.Chalian, pg 294 – 297.
Custom made ocular prosthesis –Sykes Custom made ocular prosthesis –Sykes LM, jpd 1996, 75;1-3LM, jpd 1996, 75;1-3
Ow RK, Amrith S; Ocular prosthetics: Ow RK, Amrith S; Ocular prosthetics: Use of a tissue conditioner material to Use of a tissue conditioner material to modify a stock ocular prosthesis. JPD modify a stock ocular prosthesis. JPD 1997, 78, 218-222.1997, 78, 218-222.
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Thank you
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