F I R ST I S Q UALI T Y Impression · good restoration F I R ST I S Q UALI T Y. 2 3 Every dentist...

Guide to correct tray selection

ImpressionTrays

The foundation of a

good restoration

F I R S T I S Q U A L I T Y

2 3

Every dentist knows howimportant it is to take anaccurate impression. Theright impression materialand a good impression-taking technique go a longway to ensuring the bestresults. But what about therole of the impression tray?

The tray is the foundationof an accurate impression.Using an inappropriate traycan be like trying to take anaccurate measurement witha ruler which stretches. You can’t do it!

Independent surveyshave shown that around half of impressions forcrown and bridge work are‘not good enough’ to createsatisfactory restorations.1,2,3

However they occur,restorations that don’t fit, or fit poorly, can upset and inconvenience yourpatients, may cause frictionwith your laboratory, andwaste both practice timeand money –a situation aprofessional, well-run dentalbusiness should seek toavoid!

Bad impressions arebad for business

● Extra chair-side time ● Repeat visits for the patient● Wastes expensive materials ● Remake bill from thelaboratory● Can upset laboratory relationship ● Wastes administrationtime ● Further patient expense● Patient distress● Possible compensation

Given the importance of the tray in achieving accurate impressions,experts have called for moreguidance to be given to dentists in correct tray selection.6

As one of the world’s leading manufacturers ofimpression trays and materials, GC has preparedthis guide to help dentistsconsider the basis of theirown tray selection. After all, making sure thatyou take the most accurateimpression possible, first time, is not just gooddentistry, it’s good business!

Independent Europe-wide investigations into thequality and accuracy ofimpressions for crown andbridge work, found that around 40% to 50% ofimpressions received bylaboratories were not goodenough to confidently give a satisfactory, well-fittingrestoration first time.1,2,3

It was considered impossible to produce satisfactory restorations from up to 13% of theimpressions received. 2,3

The remainingimpressions were judged to be either doubtful, i.e. the restoration could beadjusted but it would probably still result in a clinically unacceptable fit, or they were deemed probable, i.e. adjustment of the restoration wouldprobably work. 2,3

The majority of impression defects (overone-third) were related tothe margins of the preparations. As the authorsobserved "this can only leadto guesswork on the part ofthe technician and a restoration which will becompromised from the outset”. 2

Where it was necessary to record the occlusion,defects on the opposingimpression were also common, or "sometimesthere was no impression atall . . . ”. 2 A ‘high’ restoration for example, is frequently due not to error by the technician butto defective recording of the occlusal surfaces of theteeth.1

Other mistakes in theimpressions were due to ‘air blow’, ‘folds’ and ‘drags’in the impression materialitself.1,2

Bad impressions are bad for business 40% to 50% of impressions were considered ‘not good enough’ 1,2,3

Majority of impression defects: indistinct margins

Problems resulting from wrong tray selection

4 5

Looking at the reasons for impression defects, the investigators found thatthe most interesting factorwas the use of plastic trayscompared to metal trays. 3

Studies have shown thatmost disposable plastic traysare too flexible to ensure accuracy, particularly whenthe two-stage putty/washsilicone impression materialis used. 2,3,4

The procedure requireslight-bodied material to beadded to the putty silicone,and when this occurs stresses can be induced in the putty. If a stock tray is used which is made of flexible plastic, these stresses can deform the tray.4

The critical area for traystiffness is bucco-lingually (if your plastic trays can beeasily flexed with fingerpressure in that dimension, the impression putty mayalso flex the tray during seating). If the tray is deformed it will spring backto a smaller bucco-lingualwidth when removed fromthe mouth, resulting incastings which are then too narrow along thisdimension.5

Dimensional distortion ofthe impression is also morelikely when a flexible tray isused, if excessive pressure isapplied during impressionmaking.4 The space between the teeth and the side walls of the tray isoften so great, that a lot of impression material is required to fill it, leading todimensional shrinkage.5

. . . flexible plastic trays canbe "false economy”

The fact that plastic trays are cheaper than metal traysis probably one reason fortheir widespread use, butconsidering that crown andbridge work is expensive theuse of flexible plastic trayscan be "false economy”.2

Selecting the righttray

To ensure restorations fit first time, it is necessary to use the right impressionmaterial and the right tray.The British Society forRestorative Dentistry (1998)gives the following guidelines for choosingtrays, whether custom-madeor of the stock variety. They should:

● Be rigid in use

● Have sufficient extensionto support an impression ofall structures to be recorded

● Incorporate occlusal stopsand, where indicated, havefeatures which aid retentionof the impression

● Have a robust, preferablyan integral handle

● Be capable of withstanding autoclave sterilisation if not designedfor single-use

Custom-made orstock tray?

The first question to ask is whether the patient/procedure requiresthe use of a custom tray or a stock tray. As the nameimplies, custom trays are‘custom-made’ for an individual patient and sotake time to construct andcost more than stock trayswhich are bought and used‘off the shelf’.

To maximise the chancesof taking an accurateimpression, it is important to reduce the volume of the impression space to aminimum and to minimisethe escape of excess material from the impressionspace. This is achieved byusing the best fitting traypossible and so stock traysare available in a range ofsizes and shapes.

However, the fit of somestock trays particularly in theupper arch and lingual areain the lower arch can leave alot to be desired. The traymay also be posteriorly tooshort and there may beinsufficient envelopment ofthe posterior extension ofthe dental arch.

For the majority of procedures the accuracyachievable with a stock traywill be sufficient, but if aprocedure demands absolute accuracy such asdenture work, and a stocktray cannot be found whichadequately fits the patient,then a custom-made tray isrequired. Regardless of theimpression technique ormaterial used, a properlyconstructed custom trayhelps to take an impressionwith a very high degree ofdimensional accuracy.5

GC offers the widestrange of stock trays available in Europe, as wellas accessories and materialsto make custom trays.

The wrong tray can cause defects in the impression

The tray is the foundation of an accurate impression

During seating, high viscous materialwill expand disposable tray

During removal, tray will spring backexcessively

Result: a too small crown

6 7

Keeping in mind the tray selection guidelinesdetailed previously, there areessentially four aspects of astock tray to be consideredwhen choosing the most suitable one for a patient/procedure:

1. Accuracy vs.disposability: metal or plastic?

2. Type of impression material: retention features?

3. Type of impression: closed or open-bite design?

4.Type of patient: dentate / edentulous, size and shape?

1. Accuracy vs.disposability: metal or plastic?

Stock trays from GC currently come in two materials: metal and plastic.Which to choose dependsmainly on the degree ofaccuracy required, theimpression material beingused and whether or not re-use or disposability is preferred.

Metal trays forwhen accuracy isthe priority

To help ensure the bestchances of an accurateimpression, the tray must actas an effective barrier or‘dam’ against the flow ofimpression material withinthe tray. The more effectivethe barrier the more ‘pressure’ is created to ‘push’the impression material toall areas to be recorded. The more rigid the tray themore effective the barrierand so rigid trays such asmetal trays give more accurate impressions thanflexible plastic trays.1,2,3 Metal trays from GC

have long been the firstchoice of dental schoolsand dentists worldwide.They are available in:

● Traditional stainless steel.

● Unique coated metal.

An impression materialwith poor elastic propertiessuch as alginate, requires the highest possible pressure to‘push’ the impression material around the tray.6

Using a metal tray is therefore, particularly important with this type ofimpression material. Even ifusing the flexible siliconeimpression materials, ametal tray is still the idealcompared with plastic traysif a high-degree of accuracyis required.

All GC metal trays have a strong integral handlewhich helps you to transferfurther pressure to the trayand to allow for easy trayplacement and removal.

GC metal trays, especiallythe perforated coated typeare also bendable. Thismeans the borders of thetray can be moulded slightlyto suit the patient better, helping to ensure that theimpression material flows toall required areas.

When accuracy isless important:plastic trays

GC’s plastic ‘spacer’ traysare made of a rigid plasticalthough they are not asrigid as metal trays, so aremore suitable for procedures where greataccuracy is not required6,such as opposing archimpressions, occlusal registrations, making modelsand taking impressions for temporary restorations.

However, if it is necessaryto use a non-rigid plastictray, rather than a metal tray,they can be easily reinforcedwith a 1-2 mm thick, 6-10mm wide strip of self-cureacrylic across the distal flan-ge of the tray.5

GC spacer trays have aunique ‘zig zag’ rim alongthe bottom of the tray thatminimises cusp contact withthe tray and enables the trayto be easily seated to the correct depth for consistent,quality impressions. All GC plastic trays have anintegral handle for easy trayplacement and removal.

Disposable plastic or re-usable metal?

Metal trays are designedfor reuse. They are easy toclean, can withstandautoclave sterilisation andare extremely resistant to thesterilising solutions, so theylast for years and are thusvery economical over thelonger term.

Metal trays, however, can only be ‘reused’ if yourlaboratory returns them andunfortunately, they cannotalways be relied upon to dothis, or you may get back another dentist’s tray as theyare difficult, if not impossible, to identify asbelonging to a particulardentist.

Plastic trays were introduced to overcome this problem, as they arecheap enough to be disposable and are designed for single-use.

Using a metal or a plastictray is a matter of choice forthe individual dentist orpractice. Given the superioraccuracy of impressionsachievable with metal traysand that if reused, they probably work out cheaperin the long run than disposable plastic trays, dentists might like to consider engraving theirdetails into the metal tray toaid identification by the technician and give strictinstructions to the laboratoryto return all metal trays.

GC Stock trays GC Stock trays

GC Stock trays: choice between stainless steel and coated metal

GC coated metal trays are bendable GC metal trays can be autoclaved GC plasic "spacer” trays are disposable

Selection of GC plastic "spacer” trays

8 9

2. Type of impression material: retention features?

Impression materialneeds to be held firmly or‘retained’ within the tray inorder to help prevent theimpression material comingaway from the tray floor andwalls, especially duringremoval, and to guide thepolymerisation and thermalshrinkage toward the traywalls, instead of towards thecentre.

Depending on whichtype of impression materialis being used, GC metal andplastic trays are availablewith various features andcombina-tions of featuresdesigned to aid retention.

Perforated or non-perforated (solid)trays

Due to the popularity ofdouble-step impressiontechniques and elastomericmaterials, many plastic andmetal trays in use today areperforated. The perforationsallow the impression material to expand throughthe holes and so be held securely in place. Perforatedtrays are also suitable foralginate materials but nothydrocolloid which needsto be water cooled.5

For single impressiontechniques, such as monophase polyether, solid metal trays withoutperforations are required inorder to contain the materialand to enable sufficientpressure to build up againstthe tray walls and so holdthe material securely inplace.

Rimlock trays

For additional retentionsome metal trays feature arimlock or ‘lip’ which protrudes inwards slightlyfrom the top of the tray wall,whilst others also have arimlock on the base insidethe tray. Both perforatedand solid trays can haverimlocks, but solid trays aredesigned specifically for usewith alginate.

GC Tray Adhesive

The inside of all trayswhether perforated or not,should always be coatedwith GC Tray Adhesive inorder to help prevent ‘pull-away’ and distortionwhen removing the tray. Use of a tray adhesive also helps to direct polymerisation and thermalshrinkage toward the traywalls, instead of towards thecentre. Ensure the adhesiveis allowed to dry beforeapplying the impressionmaterial, see instructions fordetails.

3. Type of impression: closed or open-bite design?

Stock trays differ depending on whether theyare designed for closed-biteor open-bite impressions.

Open-bite impression trays

The vast majority of trays,and so far all those described in this booklet,are for open-bite impressions. There are manydifferent types to choosefrom depending on whetherthey are for dentate oredentulous patients, andmade of plastic or metal.

Closed-bite impression trays

This type of tray is distinguished from open-bite trays by having a microthin flexible mesh as thebase for the impression.With GC ‘Triple-Function’trays you can take an accurate working impression, a counterimpression of the opposingarch and a precise bite registration, in one easy procedure.

There are two plastic trayvariations to choose fromand a coated metal tray for when more rigidity isrequired.

● GC Check-Bite ‘Triple-Function’ plastic trays are for either the anterior orposterior regions. The trayhas sidewalls and coversmore than half the archresulting in multiple biteregistration points for moreaccurate occlusion.

● GC Sideless ‘Triple-Function’ plastic trays come in two parts, whichwhen linked together cantake a full arch impression.As the name suggests, theydo not have sidewalls andthis means each half (or partial tray) is fully adjustable to four positionsso accommodating variousarch sizes. Each partial traycan also be separated fortaking a quadrant.

● The GC Check-Bite tray is a coated metal tray forgreater accuracy. It comeswith separate disposableocclusal inserts. When poured and mounted onthe articulator, Check-bite impressions (bite registrations) produce a pair of complementary separable models in trueocclusal relationship.

GC Stock trays GC Stock trays

Perforations keep putty materialswell in place

Solid trays are recommended formonophase materials

Rimlock for additional retention GC Tray Adhesive

Direction of polymerisationOptimal retention: well fitting crown

Direction of polymerisationPoor retention: too small crown

Selection of GC metal and plastic open-bite impression trays

GC Check-Bite plastic trays GC Sideless plastic trays

GC Check-Bite metal trays

11

Shape and size of tray?

Stock trays are available in arange of shapes designedfor the most common mor-phological dental arch sha-pes.

GC plastic and stainless steel trays come in:

● Regular, full arch trays

● Partial arch trays

GC coated metaltrays come in fourvariations:

● Regular full arch trays

● Partial arch trays

● Extra long traysOccasionally needed particularly to reach the dor-sal/3rd molar area.

● Paedodontic traysDesigned especially forchildren as they have smal-ler arches and may ‘gag’ iftrays which are too long areused.

Each GC tray also comesin a range of sizes, fromextra small to extra large insome cases.Three size parameters vary:the buccal width, the traylength and the anteriordepth. After determining theshape of the arch, special measuring dividers can beused to help choose thebest size of tray.

Tray tips● A tray is not rigid enoughif it can be easily flexed withfinger pressure bucco-lingually.

● Use coated metal trayswhich are bendable for amore accurate fit.

● Engrave your name intometal trays to aid identificati-on by the laboratory.

● Ask your laboratory toreturn all metal trays.

● Select the best shape oftray first and then size.

● Use a special divider tochoose the correct tray size.

● A layer of wax betweenthe tray and impressionmaterial can improve tray fit.

GC Stock trays

10

4. Type of patient: dentate / edentulous, size and shape?

Dentate patients

For dentate patients thereare both metal and plasticGC trays to choose from intwo designs:

● Full arch trays

● Partial arch trays that cover each of the fourquadrants.

There is also a coatedmetal partial arch ‘swivel’tray with a multi-directionalhandle, designed to take impressions for all temporary crowns.

Edentulous patients

For edentate patients thereare coated GC metal trays in three variations:

● GC immediate (or McGowan) denture traysThe finest trays for all dentu-re work. They have rimlocksinside and outside the tray for optimum retention.

● GC complete denturetraysAll-purpose fit trays that givegood results in most cases.They are ideal for dentistswho are not specialist prost-hodonists.

● GC STO-K traysFor use with alginate impres-sion materials. Their specialdesign guides the alginate toall areas of the tray for opti-mal reproduction of all ana-tomical structures anddetails. To match the pati-ent’s anatomical characteri-stics they are available intapered, ovoid and squareshapes and are made frombendable coated metal.

GC Stock trays

Selection of GC metal and plastic trays for dentate patients

Selection of GC immediate (or McGowan) trays

GC complete denture trays for edentate patients

GC STO-K trays for edentate patients are available in different shapes

Size determination of GC Stock trays

Width

Lenght

Depth

plastic coated stainlessmetal steel

regular,full arch

partial arch

extra long

paedodontic

Available shapes of GC Stock trays

= ?`

=

?

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13

Using a stock tray whenever you can, ratherthan constructing a customtray, saves you time andmoney. But only if it is theright stock tray for the job!

Using an inappropriatetray because you only havea limited range of stock traysto choose from is ‘false economy’, especially whenyou consider the expense ofeven routine crown andbridge work.

The following pages present the complete rangeof GC stock trays, the widest range currentlyavailable in Europe, as wellas GC materials for makingcustom trays.

Check that you have allthe stock trays you need tohelp you take the best possible impressions.

Do you have enough of the right trays?

12

Custom trays are firstchoice for procedures suchas denture work and complicated bridge work.GC offers dentists or theirlaboratories the materials tomake custom trays in twodifferent ways:

1. Indirect method: Acrylic resin

GC Ostron 100 is a self-curing acrylic resin in twoshades (transparent pink and blue) for makingcustom trays, base platesand bite registration. It hasthe following advantages:

2. Direct method:‘ImpressionSeparation Wafer’(ISW) technique

This uses a specially designed ‘ImpressionSeparation Wafer’ togetherwith GC Exaflex Putty and aGC stock tray (preferablyrigid metal).

● Mixes quickly into a‘doughlike’ consistency

● Does not stick to fingers, spatulas or themixing bowl

● Mouldable after just 30 seconds

● Gives more than 6 minutes working timebefore setting (via cold polymerisation)

● Easy to trim

● Ample rigidity andstrength for impression traysand base plates.

● Gives a smooth and glossy surface after setting

Unlike the indirect methodwhere the laboratory makesthe tray, this constructionmethod enables the dentistto make the tray so only oneappointment is required. It is also an easy techniqueto master, so is usually cheaper and quicker to perform.

GC Custom trays

GC Ostron 100 – easy to handle

ISW technique enables dentists to make a custom tray at the chair

GC Ostron 100

15

PerforatedPaedodontic

Dentulous TraysCoated Metal

14

PerforatedRegular

● Rigid tray for enhancedaccuracy

● Bendable metal so can be moulded for a more individual fit

● Very durable and resistantto sterilization so lasts a longtime

● Strong integral handle for secure tray control andremoval

● Rimlock borders

● Wide variety of tray types, shapes and sizes to choose from


Open-bite impression Trays Open-bite impression Trays

Width Length Depthcm cm cm

Upper sizesX1 Extra Large 8,57 6,50 2,221 Large 7,62 6,35 2,223 Medium Large 7,30 6,35 2,224 Medium 7,30 6,03 2,225 Medium Narrow 6,66 5,08 1,907 Small 6,66 5,08 1,74

Lower sizesX20 Extra Large 8,09 6,19 2,2220 Large 7,62 6,03 1,9021 Medium 7,62 5,71 2,2222 Small 7,46 5,39 2,06

Set of 8 trays1, 3, 4, 5, 7, 20, 21, 22


Upper sizes7 Small 6,66 5,08 1,749 Smaller 6,19 4,76 1,9014 Extra Small 5,71 4,12 1,58

Lower sizes22 Small 7,46 5,39 2,0624 Smaller 6,35 4,92 1,9028 Extra Small 5,55 4,44 1,58

Set of 6 trays7, 9, 14, 22, 24, 28

X1

4

X20

1

5

20

22

3

7

21

7

22

9

24

14

28

1716

PerforatedExtra Long


Open-bite impression Trays

PerforatedPartial




Sizes30 Upper Left or Lower Right 4,44 6,19 1,9031 Upper Right or Lower Left 4,44 6,19 1,9032 Anterior Lower 6,35 3,81 2,0633 Anterior Upper 6,66 3,65 2,0699 Swivel, Upper and Lower 3,17 5,55 1,90

Set of 4 trays 30, 31, 32, 33


Upper sizesXL5 Extra Wide, Extra Long 6,98 6,35 1,90XL7 Extra Wide, Long 6,98 6,03 1,74XL9 Wide, Long 6,50 5,08 1,58XL14 Medium Wide, Long 5,87 3,65 2,06

Lower sizes XL21 Extra Wide, Extra Long 7,93 6,66 2,06XL22 Extra Wide, Long 6,98 6,35 2,06XL24 Wide, Long 6,82 5,71 1,74XL28 Medium Wide, Long 5,39 5,39 1,58

Set of 8 trays XL5, XL7, XL9, XL14, XL21, XL22, XL24, XL28

XL5

XL21

XL7

XL14

XL22

XL28

XL9

XL24

30

33

31

99

32

1918

SolidRegular




Upper sizes101 Large 7,62 6,35 2,22103 Medium Large 7,30 6,35 2,22104 Medium 7,30 6,03 2,22105 Medium Narrow 6,66 5,08 1,90107 Small 6,66 5,08 1,74109 Smaller 7,30 4,76 1,90

Lower sizes 120 Large 7,62 6,03 1,90121 Medium 7,62 5,71 2,22122 Small 7,46 5,39 2,06124 Smaller 6,35 4,92 1,90

Set of 8 trays 101, 104, 107, 109, 120, 121, 122, 124

SolidPartial




Sizes130 Upper Left or Lower Right 4,44 6,19 1,90131 Upper Right or Lower Left 4,44 6,19 1,90132 Anterior Lower 6,35 3,81 2,06133 Anterior Upper 6,66 3,65 2,06199 Swivel, Upper and Lower 3,17 5,55 1,90

Set of 4 trays 130, 131, 132, 133

101

105

120

103

107

121

124

104

109

122

130

133

131

199

132

2120

PerforatedRegular

● Rigid tray for enhancedaccuracy

● Very durable and resistantto sterilization so lasts a longtime

● Strong integral handle for secure tray control andremoval

Dentulous TraysStainless Steel



Upper sizesSX1 Extra Large 8,57 6,50 2,22S1 Large 7,62 6,35 2,22S3 Medium Large 7,30 6,35 2,22S4 Medium 7,30 6,03 2,22S5 Medium Narrow 6,66 2,00 1,90S7 Small 6,66 5,08 1,74

Lower sizes SX20 Extra Large 8,09 6,19 2,22S20 Large 7,62 6,03 1,90S21 Medium 7,62 5,71 2,22S22 Small 7,46 5,39 2,06

Set of 8 trays S1, S3, S4, S5, S7, S20, S21, S22

SolidRegular




Upper sizesS101 Large 7,62 6,35 2,22S103 Medium Large 7,30 6,35 2,22S104 Medium 7,30 6,03 2,22S105 Medium Narrow 6,66 5,08 1,90S107 Small 6,66 5,08 1,74

Lower sizes S120 Large 7,62 6,03 1,91S121 Medium 7,62 5,72 1,91S122 Small 7,46 5,40 2,22

Set of 8 trays S101, S103, S104, S105, S107, S120, S121, S122

SX1

S4

SX20

S1

S5

S20

S22

S3

S7

S21

S101

S105

S120

S103

S107

S121

S104

S122

2322

Perforatedpartial




SizesS30 Upper Left or Lower Right 4,44 6,19 1,90S31 Upper Right or Lower Left 4,44 6,19 1,90S32 Anterior Lower 6,35 3,81 2,06S33 Anterior Upper 6,66 3,65 2,06

Set of 4 trays S30, S31, S32, S33

PerforatedRegular

● Rigid plastic gives sufficient accuracy for mostprocedures

● Cost-effective enough to be disposable so noclean-up or sterilization hassles

● Unique Zig Zag spacerminimises contact of cuspsto tray ensuring sufficientimpression material aroundthe teeth

● Strong integral handle for easy tray placement andremoval

● Anatomically designedavoiding pressure on lingual frenum and soft tissue

● Rimlock borders

● Variety of tray types, shapes and sizes to choose from

Dentulous TraysPlastic Spacer Trays



Upper sizes1D Large 7,62 6,35 2,224D Medium 7,30 6,03 1,907D Small 6,66 5,08 1,74

Lower sizes 20D Large 7,62 6,03 1,9021D Medium 7,62 5,71 1,9022D Small 7,46 5,08 2,06

* 12 Trays bag, one size * 72 Trays Shelf pack, one size * 432 Trays Master pack, one size * 72 Trays Shelf pack, assorted sizes

S30

S32

S31

S33

1D

20D

4D

21D

7D

22D

2524

PerforatedPartial

Dentulous TraysPlastic Spacer Trays



Sizes30D Upper Left or Lower Right 3,96 5,71 1,9031D Upper Right or Lower Left 3,96 5,71 1,9032D Anterior (Upper and Lower) 6,50 3,49 2,06

* 12 Trays bag, one size * 72 Trays Shelf pack, one size * 432 Trays Master pack, one size

PerforatedImmediate(McGowan)

Edentulous TraysCoated Metal



Upper sizes40 Extra Large 8,41 6,66 2,2241 Large 7,93 6,66 2,2242 Medium 7,30 6,19 2,2243 Small 7,30 6,35 2,2244 Extra Small 6,82 6,03 1,90

Lower sizes 45 Extra Large 7,30 6,35 2,2246 Medium 6,66 6,03 2,2247 Large 6,98 6,35 2,0648 Small 6,03 6,19 1,90

Set of 8 trays 41, 42, 43, 44, 45, 46, 47, 48

30D 31D 32D

40

43

45

41

44

46

42

47

48

2726

PerforatedStandard




Upper sizes61 Extra Large 7,93 6,98 1,9062 Large 7,62 6,66 1,5863 Medium 6,98 6,66 1,4264 Small 6,82 6,03 1,27

Lower sizes 66 Extra Large 8,41 6,35 0,9567 Medium 6,98 6,35 0,9568 Large 7,30 6,03 0,9569 Small 5,39 5,39 1,58

Set of 8 trays 61, 62, 63, 64, 66, 67, 68, 69

PerforatedSTO-KSquare




Upper sizesU-3-S Large 8,25 6,98 2,22U-2-S Medium 6,35 5,08 1,90U-1-S Small 6,19 4,44 1,11

Lower sizes L-5-S Extra Large 7,62 6,98 0,95L-4-S Large 6,82 7,30 0,95L-3-S Medium 6,19 6,03 1,27L-2-S Small 6,35 5,08 1,27L-1-S Extra Small 6,19 4,44 1,11

Set of 23 trays Including all Square, Tapered and Ovoid Perforated STO-KTrays

61

66

62

64

67

69

63

68

U-3-S

L-5-S

L-2-S

U-2-S

L-4-S

L-1-S

U-1-S

L-3-S

2928

PerforatedSTO-KOvoid


PerforatedSTO-KTapered


Open-bite impression Trays Open-bite impression Trays


Upper sizesU-3-T Large 7,93 6,82 1,58U-2-T Medium 6,66 5,71 1,58U-1-T Small 6,35 5,39 1,42

Lower sizes L-4-T Extra Large 7,62 6,03 0,95L-3-T Large 6,19 6,03 1,27L-2-T Medium 6,35 5,87 1,27L-1-T Small 6,03 6,50 0,95



Upper sizesU-4-O Large 7,62 6,35 1,74U-3-O Medium 6,98 6,03 1,27U-2-O Small 6,66 5,71 1,58U-1-O Extra Small 6,35 5,08 1,42

Lower sizes L-4-O Large 7,46 6,66 1,27L-3-O Medium 7,46 6,19 0,79L-2-O Small 6,82 5,39 0,79L-1-O Extra Small 6,19 5,08 0,79


U-3-T

L-4-T

U-2-T

L-3-T

L-1-T

U-1-T

L-2-T

U-4-O

L-4-O

U-3-O

U-1-O

L-3-O

L-1-O

U-2-O

L-2-O

3130

Other tray related products

GC Ostron 100Self-curing acrylic resin forconstruction of customimpression trays and baseplates.

Packaging: 1kg powder, shade blue or clear250 g liquid

GC Impression SeparationWaferThe wafer is applied to thesurface of the Putty/HeavyBody material prior to takingthe impression. The one mm thick wafer will create space for the thin flowing wash material, without the need for separate escape routes.

GC Tray ADHESIVECoat all trays (including per-forated trays) with GC Tray Adhesive beforeapplying the impressionmaterial, to help prevent‘pull-away’ and distortionduring removal of the tray.

Packaging:7ml liquid

GC TRECLEANMixes easily with water toremove alginate from metaltrays and instruments.

Packaging:1,2 kg powder

Plastic Trays

● Takes working impression,counter impression and bite registration on one procedure, saving time andmoney

● Micro-thin, flexible mesh does not impinge onretromolar area, nor interfere with full closure

● Cost-effective enough to be disposable so noclean-up or sterilization hassles

● Strong integral handleand framwork for easy trayplacement and removal

● Available in anterior and posterior styles for adequate arch coverageregardless of location

Check-BiteTriple Function Trays

Closed-bite impression Trays


Plastic Check-bite 73D Posterior style (box of 50) 6,03 5,55 1,9075D Anterior style (box of 40) 6,66 1,39 1,90

Plastic Sideless Box of 50 (25 full arch or 50 quadrants)Adjustable : 6,35 to 7,62 cm

Coated Metal Double Arch Tray72 Unilateral 1,90 10,16 2,38

Coated Metal TraysWhen poured and mountedon the articulator, Check-Bite Double Arch Trayimpressions produce a pairof complimentary separablemodels in true occlusal relationship.

Additional occlusal insertsavailable (packs of 25)

GC Exaflex / ExamixHydrophilic A-siliconeimpression material in different viscosities.Available in tubes or cartridges.

GC Exabite II NDSA-silicone bite registrationmaterial in cartridges.

73D

Sideless

75D

32

1. Carrotte P V, WinstanleyR B, Green J R. A study of the quality ofimpressions for anterior crowns received at acommercial laboratory. Br Dent J 1993; 174: 235-240.

2. Winstanley R B, Carrotte PV, Johnson A. The quality of impressions for crowns andbridges received at com-mercial laboratories. Br DentJ 1997; 183: 209-213.

3. Winstanley R B. Crownand bridge impressions – Acomparison between the UKand a number of othercountries. Eur. J. Prosthodont. Rest.Dent. 1999; Vol. 7, No. 2/3: 61-64.

4. Tjan A H L, Whang S B,Miller G D. Why a rigid trayis important to the puttywash silicone impressionmethod. Can Dent Assoc J 1981; 9: 53-58.

5. Impressions. A text forselection of materials andtechniques. Harry F. Albers.

6. Carrotte P V, Johnson A,Winstanley R B. The influence of the impres-sion tray on the accuracy ofimpressions for crown andbridge work –an investigati-on and review. Br Dent J 1998; 185: 580-585.

References GC Adresses

GC EUROPE N.V.Austrian OfficeTallak 124A-8103 Rein bei GrazTel. +43.3124.54020Fax. +43.3124.54020.40E-mail: [email protected]://austria.gceurope.com

GC EUROPE N.V.Benelux OfficeTooroplaan 11NL-3431 RC NieuwegeinTel. & Fax. +31.30.604.88.87E-mail: [email protected]://benelux.gceurope.com

GC EUROPE N.V.East European OfficeAleja Pomoraca 19HR-10020 ZagrebTel. +385.1.467.72.51Fax. +385.1.467.84.73E-mail: [email protected]://eeo.gceurope.com

GC EUROPE N.V.Finnish and Baltic States OfficeVanha Hommaksentie 11 BFIN-02430 MasalaTel. & Fax. +358.9.221.82.59E-mail: [email protected]://finland.gceurope.com

GC EUROPE N.V.Scandinavian OfficeKungsporten 4 AS-427 50 BilldalTel. +46 31 939553Fax. +46 31 914246E-mail:[email protected]://scandinavia.gceurope.com

GC EUROPE N.V.Head Office Interleuvenlaan 13B-3001 LeuvenTel. +32.16.39.80.50Fax. +32.16.40.02.14E-mail: [email protected]://www.gceurope.com

GC GERMANY GmbHPaul-Gerhardt-Allee 50D-81245 MünchenTel. +49.89.89.66.74.0Fax. +49.89.89.66.74.29E-mail [email protected]://germany.gceurope.com

GC ITALIA S.r.l.Via Calabria 1I-20098 San Giuliano MilaneseTel. +39.02.98.28.20.68Fax. +39.02.98.28.21.00E-mail: [email protected]://italy.gceurope.com

GC UNITED KINGDOM Ltd.22, Coopers CourtNewport PagnellUK-Bucks. MK16 8JSTel. +44.1908.218.999Fax. +44.1908.218.900E-mail: [email protected]://uk.gceurope.com

GC EUROPE N.V.French Branch9 bis, Avenue du Bouton d'OrF-94386 Bonneuil sur MarneTel. +33.1.49.80.37.91Fax. +33.1.49.80.37.90E-mail: [email protected]://france.gceurope.com

Correct impression tray.Accurate impression.

F I R S T I S Q U A L I T Y33

Overview

Open-bite DENTULOUS trays

Open-bite IMMEDIATE and EDENTULOUS trays

Closed-bite CHECK-BITE TRIPLE FUNCTION traysGC EUROPE N.V.

Head OfficeInterleuvenlaan, 13

B-3001 LeuvenTel. +32.16.39.80.50Fax. +32.16.40.02.14

E-mail: [email protected]

GC UNITED KINGDOM Ltd. 22, Coopers CourtNewport Pagnell UK - Bucks. MK16 8JSTel. +44.1908.218.999Fax. +44.1908.218.900E-mail: [email protected]

www.gceurope.com

PerforatedCoated Metal

Regular

Upper

X1

1

3

4

5

Lower

X20

20

21

Partial

30

31

32

33

99

PerforatedCoated MetalPaedodontic

Upper

7

9

14

Lower

22

24

28

PerforatedCoated MetalExtra Long

Upper

XL5 ●

XL7 ●

XL9 ●

XL14 ●

Lower

XL21 ●

XL22 ●

XL24 ●

XL28 ●

SolidCoated Metal

Regular

Upper

101

103

104

105

107

109

Lower

120

121

122

124

Partial

130

131

132

133

199

PerforatedStainless Steel

Regular

Upper

SX1

S1

S3

S4

S5

S7

Lower

SX20

S20

S21

S22

Partial

S30

S31

S32

S33

SolidStainless Steel

Regular

Upper

S101

S103

S104

S105

S107

Lower

S120

S121

S122

PerforatedPlastic

Spacer Trays

Upper

1D

4D

7D

Lower

20D

21D

22D

Partial

30D

31D

32D ●

Description

Extra Large

Large

Medium Large

Medium

Medium Narrow(● extra wide, extra long)

Small (● extra wide, long)

Smaller (● wide long)

Extra Small(● medium wide, long)

Extra large

Large

Medium (● extra wide, extra long)

Small (● extra wide, long)

Smaller (● wide, long)

Extra Small(● medium wide, long)

Upper Left or Lower Right

Upper Right or Lower Left

Anterior Lower (● Upper & Lower)

Anterior Upper

Swivel (Upper & Lower)

Description

Extra Large

Large

Medium

Small

Extra Small

Extra Large

Large

Medium

Small

Extra Small

ImmediatePerforatedCoated MetalMcGowan

Upper

40

41

42

43

44

Lower

45

46

47

48

EdentulousPerforatedCoated Metal

Standard

Upper

61

62

63

64

Lower

66

67

68

69


STO-K Square

Upper

U-3-S

U-2-S

U-1-S

Lower

L-5-S

L-4-S

L-3-S

L-2-S

L-1-S


STO-K Tapered

Upper

U-3-T

U-2-T

U-1-T

Lower

L-4-T

L-3-T

L-2-T

L-1-T

EdentulousPerforatedCoated MetalSTO-K Ovoid

Upper

U-4-O

U-3-O

U-2-O

U-1-O

Lower

L-4-O

L-3-O

L-2-O

L-1-O

Double Arch TrayCoated Metal

72 Unilateral

Check-BitePlastic

73D Anterior73D Posterior

SidelessPlastic

Adjustable

z O

LF

GB

3 6

0 –

10/0

0

F I R ST I S Q UALI T Y Impression · good restoration F I R ST I S Q UALI T Y. 2 3 Every dentist...

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