Lava™

Furnace 200

Sintering Guidelines For Labs

made easyFaster sintering

Lava

™

Lava™ Zirconia from 3M ESPE is formulated and processed with a methodology that is a trade secret. Sintering is critical to the final outcome of the zirconia properties. Lava™ frameworks and copings attain their exact dimensions, density and final strength during the sintering process.

Thesinteringprocessisalsoimportantforfinalestheticssincetheshadingliquidgivescopingsandframeworks the translucency of natural dentin.

Sintering Flexibility and Speed with the Lava™ Furnace 200

Three sintering programsNow with the 3M™ ESPE™ Lava™ Furnace 200, you can haveaflexibleovenwiththreesinteringprograms.Withoneof the programs, you now have the option to save “oven time” by drying shaded copings and frameworks outside the furnace. There is also a program for unshaded copings and frameworks which has an even shorter cycle time.

Lava™ ClassicTotal time 8 hours 30 min.

Lava™ Pre-driedTotal time 5 hours

Lava™ Non-shadedTotal time 4 hours 48 min.

Speed

This guide takes you through the sintering process for Lava™ Zirconia. For more detailed inform ation, please refer to the comprehensive equipmentmanualprovidedby DEkEMA and the Lava™ Furnace 200 Instructions for Use.

Specially-designed Accessories for the Lava™ System 3M ESPE worked with DEkEMA to customize the Austromat® µSiC high-temperature furnace for the Lava™ System. This means the Lava™ Furnace 200 comes pre- programmed with three sintering programs for Lava™ Zirconia. In addition, the Lava furnace comes with 3M ESPE’s custom-designed accessories. These accessories are included in the starter kit with every furnace purchase and also can be ordered separately.

Sintering CruciblesThesinteringcruciblesaremadeofAlumina(Al

2O

3)

and designed in two parts—a ring and a plate.

Tray Gripper ToolThe stainless steel gripper is specially- designed by 3M ESPE for safe handling of hot sinter trays.

Honeycomb Sintering CarrierManufactured with build-up technology, the honeycomb firingtrayisnumberedintoquadrants.Restorationscanbe tracked for easy identification when you use the log sheet in this guide to indicate the position of your cases.

Insulated Furnace TableThe furnace table securely holds the sintering crucibles.

The starter kit comes with three crucibles, three honeycomb sintering carriers and one gripper tool. All items are also sold separately. Please use the following order numbers:

68796 Plate

68797 Ring

68791 Tray Gripper Tool

68799 Honeycomb Sintering Carrier

68896 Sintering Pegs 25 mm

68897 Sintering Pegs 33 mm

68898 SoftWires

68899 Swings

69912 SoftWiresforBridges

69913 Insulated Furnace Table

Lava

™If you are shading your work, choose the desired color from the seven shades FS1 – FS7 of Lava™ FrameShadingLiquid.Todyetotheprescribedshade,soaktherestorationintheshadingliquidas described in the Instructions for Use.

To dry Lava™ copings and frameworks, place a small heat- resistant pad on your work surface. This will raise the sintering trays from the counter so you can easily lift the trays.

Add the frameworks and copings to the sintering carrier. Frameworks must be ideally positioned to allow 20 – 25 % linear shrinkage during sintering.

To accommodate the shrinkage that will occur with bridge frameworks, make sure your wire hangers or swings are placed in a “V” shape.

Place the plate of the sintering tray on the small heat-resistant pad. Then add the honeycomb sintering carrier.

Preparing for the Sintering Process

Lava™ Zirconia can be shaded insevendifferentcolors:

No shading

FS1

FS2

FS3

FS4

FS5

FS6

FS7

Continue to fill the honeycomb firing table using the sintering pegs, swings and soft wires as described in the Lava™ Frame Instructions for Use so frameworks are free from tension.

Place ring around the plate. The crucible windows enable a “visual check” of the copings and frameworks when positioned properly.

Place a new plate on top of the first crucible.

Repeattheprocesstwomoretimes until you have three trays ready for sintering. Make sure the crucible windows are in alignment for easier loading and unloading.

Sintered crowns and bridges can look similar. In order to easily identify your cases, record the placement of each case on the log sheet provided at the end of this guide.

123

4

Lava

™

When using the Lava classic cycle, the frameworks and copings are dried on the furnace lift outside the oven.

Sintering with Lava™ Zirconia

Air Exchange 12 min. Sintering Cycle 4 hours 48 min.

Sintering Cycle 4 hours 48 min.

Drying time 3 hours 30 min. Air Exchange 12 min. Sintering Cycle 4 hours 48 min.

This cycle incorporates drying time for shaded copings and frameworks.

Designed for automation or overnight use, this program dries copings and frameworks on the furnace lift. During the sintering cycle, the furnace will open to release the gases from the shading liquidthataccumulatewithinthefurnace.

For shaded copings and frameworks that have already dried.

This program allows you to reduce “oven time” by drying your work outside the furnace before you sinter. During the sintering cycle, the furnace will open to release gasesfromtheshadingliquidthataccumulatewithinthefurnace.

For all unshaded copings and frameworks.

This is similar to the “Lava Pre-dried” program since it does not include a dry cycle. Additional time is saved since the furnace does not need to open to release the atmosphere before sintering.

After sintering, use the gripper tool to remove each sinter tray from the furnace.

Lava™ ClassicTotal time 8 hours 30 min.

Lava™ Pre-driedTotal time 5 hours

Lava™ Non-shadedTotal time 4 hours 48 min.

Sintering

To load the sintering trays into the furnace, use the specially-designed gripper tool made for the Lava™ Furnace 200. You must load and unload the furnace one tray at a time.

Choose the sintering program for your work from the control unit.

Carefully stack each crucible onto the firing table of the furnace. The furnace will accommodate three crucibles. The top crucible should be covered during sintering.

Please use crucibles when drying your work outside the furnace.

Please note:

• Ifyouwanttosinter unshaded and shaded copings and frameworks together, you may sinter unshaded units with any of the three sintering programs. The extra drying timeand/orairexchange cycle does not harm the unshaded units.

• Ifyouwanttosinterdry and wet shaded units together, you may sinter using the Lava™ Classic program. The extra drying time does not harm the pre-dried units.

•Copingsandframeworks that have not been pre-dried can only be sintered in the Lava classic program.

Lava

™The following figure shows the display of the USB terminal with the program display.

Program Display

Temperature in the firing chamber

Provisional duration or residual time of firing program

Date of firing furnace control

Time of firing furnace control

Program name

Command lines. Depends on the current menu of the firing oven control:

•While the program is running: Current command and its duration or remaining runtime is shown.

Function Keys

You can use the function keys of the USB terminal to execute the basic functions for operating the firing furnace.

Key Change Description

[LIFT UP]-Pressonce:Theliftmovesupward.-Pressagain:Theliftstopsmoving.

[MEMORY+]- Advances one position forward

in the program memory.

[MEMORY–] - Goes back one position in the program memory.

[LIFT Down]-Pressonce:Theliftmovesdown.-Pressagain:Theliftstopsmoving.

[SETUP]

Opensthe“Setup”menu:-Pressonce:Activateanddeactivatethelighting

of the USB terminal.-Pressagain:Temperaturecalibration.-Pressagain:Displaynetworksettings.-Pressagain:Displayfurnaceinformation.

[START]- Starts the selected program -Forthefirststartup:

Confirmtheselection(Enterkey).

[STOP] - Prematurely terminates the program.

[ON/OFF]

-Emergencyofffunction:Pressthistoendall current commands.

-Toturnonandoffinstandby:Pressthekey and hold it for about five seconds. For more informations, refer to

the manual from DEKEMA.

Log Sheet Sintered crowns and bridges can look alike. In order

to easily identify your cases, record the placement

of each case.

Date: Time:

Tray #1

Tray #2

Tray #3

Quadrant #4

1.

2.

3.

4.

5.

6.

7.

8.

Quadrant #3

1.

2.

3.

4.

5.

6.

7.

8.

Log Sheet Sintered crowns and bridges can look alike. In order

to easily identify your cases, record the placement

of each case.

Date: Time:

Tray #1

Tray #2

Tray #3

Quadrant #1

1.

2.

3.

4.

5.

6.

7.

8.

Quadrant #2

1.

2.

3.

4.

5.

6.

7.

8.

Advanced Techniques: Optimizing Drying Time Outside the Furnace

Condition / Drying

Temperature (°C)

Humidity (%)

Conditions Minimum drying time in minutes

Cabinet drier with air circulation

25 50additional air movement through air circulation in the cabinet drier

60

Dry air 20 20without additional air movement

80

Standard environment 20 55without additional air movement

120

Tropical conditions 30 80without additional air movement

180

Examples for minimum drying times and different conditions influencing the drying time are shown in this table. Longer drying times are harmless. To define drying times for special or individual conditions, you must determine the time it takes to achieve a weight loss of 8.5% or more.

Drying temperature•Withoutadditionalairflow:20° C – 30° C•Withadditionalairflow(e.g.,dryingcabinetorfan):

20° C – 25° C

Protecting copings and frameworks•Toprotecttheunitsfromdust(especiallyglassdust)

by covering the sintering tray with a breathable material (e.g.,cellulosecloth).

•Thecoveringshouldnotcomeintodirectcontactwith the shaded frameworks and copings.

Achieve 8.5 % weight loss•Tocalculateweightlossinpercent=(m

colored — m

dried)/

mcolored

x 100•Definitionofm

colored:Weighingoftheworkimmediatelyafter

coloring(dabbedwork,noliquidonthesurface)•Definitionofm

dried:Weighingoftheworkaftergiven

drying time

You can calculate the drying time needed for your conditions using the instructions below. If you choose not to calculate this time, allow 3.5 hours for drying. Please refer to the Lava™ Furnace 200 Instruction for Use for more information.

3M ESPE Customer Care Center at 1-800-634-2249 3MESPE.com/lava

3M CanadaPost Office Box 5757London, Ontario N6A 4T1Canada1-888-363-36853MESPE.ca/lava

Dental Products3M CenterBuilding 275-2SE-03St. Paul, MN 55144-1000USA

3M, ESPE and Lava are trademarks of 3M or 3M ESPE AG. Used under license in Canada.Austromat, µSiC and DEkEMA are trademarks of DEkEMA Dental-keramiköfen GmbH.

Please recycle. Printed in USA.© 3M 2008. All rights reserved.70-2013-0133-3