journal review / orthodontic courses by indian dental academy

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..

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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

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.


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


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


Stock ocular prosthesisStock ocular prosthesis


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


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


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.


PVS cope and indexed cast with PVS cope and indexed cast with existing prosthesis in placeexisting prosthesis in place


Mold filled with chemical – cure Mold filled with chemical – cure polymethyl methacrylatepolymethyl methacrylate


Perforated acrylic resin trayPerforated acrylic resin tray


Shortened 5ml syringeShortened 5ml syringe


Custom tray fitted with syringe Custom tray fitted with syringe tiptip


Tray with screwed syringe Tray with screwed syringe barrelbarrel


The resulting impressionThe resulting impression


Impression suspended in Impression suspended in a cupa cup


The wax scleral pattern is The wax scleral pattern is removed from the alginate removed from the alginate

moldmold


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.


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.


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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