Unfortunately, there is little information available on sintering zirconia. It seems as though most lab owners are highly focused on the specifics of a new scanner or mill and then buy a random sintering furnace without the same in-depth knowledge they obtained when buying the other pieces of equipment. Interestingly, the sintering process is as important as both the mill and the scanner. When I walked the floor at LMT Chicago this year there were more than a dozen different sintering furnaces to choose from. The price range was huge, from $3,500 to $18,000. With this wide range in price it’s obvious there must be some significant differences. By de-emphasizing the value of a quality sintering furnace you may be compromising the esthetics and strength of your zirconia restoration.
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When looking for a sintering furnace we believe the following to be either critical or very important components and design features for sintering furnaces:
Bottom Entry Only. Many years ago we had porcelain furnaces with front entry. How often do we see this now? Never! Why? The heating chamber is colder close to the door, hotter in the rear of the chamber. This was found to be problematic for firing porcelain and it’s not good for sintering zirconia either. Bottom entry sintering furnaces have heating elements evenly distributed around the heating chamber. This provides a much more even heat distribution throughout the muffle and a more consistent firing temp of all units.
Heating elements are another big consideration. Generally speaking, this is the primary point of failure for most sintering furnaces. There are no materials fired in a dental lab that require as much heat as zirconia sintering. Most zirconia materials fire at a high temp of 1500°-1550°C with a hold at the top temp for two hours or more. That’s a lot of heat. Sintering furnace heating elements are generally made from one of two different materials, Silicon Carbide (SiC) or Molybdenum disilicide (MoSi2). More commonly used SiC elements are less costly and last six months to a year when used daily. The SiC elements are built to fire at a maximum temp of 1600°C. When firing at 1550° in a furnace with a top temp heating element of 1600°C you are heating the furnace to the max on every firing cycle. This results in a shorter life expectancy as you are pushing the furnace to the limit on every firing. SiC heating element failure is costly in replacement parts, labor, and is a potential loss of work in the furnace when the elements fail. In addition, unless you maintain a spare set, you may be down for several days. If this is your only sintering furnace your entire production is shut down. The SiC elements are often found in the more economical furnaces.
The second type of elements, MoSi2 have been designed to withstand and fire up to 1800°C. We have been using these heating elements for several years and have found they are lasting for more than three years while putting them through a cycle 6-8 times a week. When firing at 1550° in a furnace that is rated at 1800° we are well within the upper limits. This scenario translates to running the furnace well within the upper limits of the firing temp. Keep in mind, building a sintering furnace becomes incrementally more expensive with every 50-100 degrees added to the maximum firing temp. As a result, you will pay more for a furnace rated for 1800° with MoSi2 heating elements but in the long run it will likely cost the same while providing stress free sintering for years to come.
Capacity is another important factor. Zirconia is the single most growing restoration in dental labs. If you’re just becoming involved in zirconia production, odds are your volume will increase and so will your sintering capacity needs. Sintering furnaces have limits to the number of trays that fit in a single cycle. Some fit only one, others up to 3. There are also problems with overloading a try with too many restorations. The crowns need some space for optimal results. Overloading trays can result in compromised esthetic results. Buy a furnace with capacity for growth. If you are filling your current furnace to the max, it may be time to add a second one.
Programs. Most zirconia materials require at least two ramp rates. It’s important to have the ability to program a furnace in accordance to manufacturers recommendations. In addition, we have come to an age where we really should be using more than one material. For instance, we believe you should use a higher strength zirconia for long span frameworks another for full contour, and Sagemax Nexxzr S for zirconia custom abutments. This material has a flexural strength of 1550 MPa (most of our existing zirconia materials today are 800-1100 MPa). To my knowledge, this is the strongest dental zirconia on the market. Sagemax Nexxzr S is the material of choice for both hybrid and full zirconia custom abutments. This would also be the material of choice for frameworks with connectors that are minimal in size. The ability to have multiple programs and multiple firing stages has become a must.
When purchasing CAD CAM don’t sell yourself short on a sintering furnace. Sintering is as important to the system as all other components. CAP offers a sintering solution that meets all of the above essential criteria. In addition, we have been using the Sintra from Shenpaz furnace for more than three years on a daily basis. We have looked at all the above essential criteria and know the Sintra meets or exceeds all these requirements. Here are some of the specs.
Maximum temp 1800°C.
Bottom entry
MoSi2 heating elements
200 different programs
10 different programmable ramp rates and hold times
Two tray capacity. Or about 60-80 units
For more information click here:
http://cap-us.com/products/sintra-sintering-furnaces/
①[SINTERING] :Sintering interface. ②[STANDARD]:Standard procedure selection. ③[CUSTOM]:Custom program selection. ④[PROGRAM]:Program parameter setting interface. ⑤[UP]:The tray rises. ⑥[DOWN]:Tray down. ⑦[SET]:Other settings. Program parameter setting need to enter 11 parameters in sequence to complete the setting： （Please read the instruction manual for details） 1.Pre drying temperature 2.Pre drying time 3.Temperature rate of the first temperature curve 4.Maximum temperature of the first temperature curve 5.High temperature holding time of the first temperature curve 6.Temperature rate of the second temperature curve 7.Maximum temperature of the second temperature curve 8.High temperature holding time of the second temperature curve 9.Cooling time 10.Opening temperature of furnace door 11.File name
The sintering furnace must be installed in the dry room,and it must be put at least 25cm away from the wall. A. Take out the sintering furnace core from the accessories for standby(it must be placed in a safe place); B. Insert the output plug of the power unit into the sintering furnace and the input plug of the power unit into the external plug. (for 220 V instruments only); C. Turn on the power switch of power unit,then turn on the power switch of sintering furnace. D. When the sintering furnace starts and display the main interface(when the temperature is displayed), press the down button, and the sintering platform moves downward (do not place any obstacles on the track of the sintering platform )； E.Assemble the baking core on the sintering platform. The output voltage can be controlled to reduce the driving voltage. Effectively prolong the service life of silicon carbide rod. The lower voltage is used to drive the silicon carbide rod to reduce the heat load so the service life of the silicon carbide rod is greatly prolonged. Power unit must be placed in a well ventilated and dry place. Attention：Never start up the device without baking core!
High Purity Elema Technology！ Fast temperature rise to 1500°C in 20 minutes，The crystallization process takes 40 minutes to an hour！ TR-DLC02 does not simply use 220V mains power to connect silicon carbon rods in series, but reduces voltage to drive, so that the thermal load of silicon carbon rods is greatly reduced and the service life is effectively extended. Moreover, the temperature rise is controlled at 20 minutes as the program limit, which does not mean that the temperature can not be heated up rapidly. At present, even the top silicon carbon rod in Denmark cannot bear the huge thermal load, and the service life of repeated use will be rapidly shortened. Features： 1.Fast sintering of the fully form 2.Predrying 3.Maximum sintering temperature 1530℃ 4.Finish glazing in 9 minutes 5.Maximum heating speed 200℃/ S 6.Ready to use after power on, without 2 hours of preheating 7.Active cooling 8.Crown restoration 4-10(60mm dianeter tray)
1. All the items at TREEDENTAL store are covered with a warranty. The warranty period is indicated in each item's description. 2. Warranty covers a replacement or repair of the faulty item. Contact us immediately for any issue that might happen to our product within the warranty period which is not man-made. You simply need to fill in the TREEDENTAL International Warranty Form here . 3. Within the warranty period, TREEDENTAL store will be responsible for covering the fee of the new spare parts and their shipping cost into your destination. If the faulty item needs to be sent back to our store for checking and repair, then we will cover the fee of shipping it back to our store. Upon its arrival to our store, we will cover the fee of the repair and ship it back to your doorstep for free also. 4. If your purchased item is out of the warranty period, then you can report the issue to us into [email protected] and our technical support team will issue you a report for the repair fee based on the kind of the fault. 5. Replacement: In case the product received comes with manufacturing defects, the buyers are entitled to request a product replacement within 7 days of receiving the item. To request a replacement, the buyers are required to provide photographic as well as video evidence of the product’s manufacturing defects which can be sent to our email: [email protected] . If the case is deemed valid, then we will cover the related cost to deliver a replacement.
The price displaying on website is factory price only, not including any shipping cost, your country’s import tax, customs clearance fee and insurance.
Shipping Cost
We can ship out the goods to you by three ways: Express ( DHL/UPS/FeDex/EMS), Air Shipping or Sea Shipping.
Express is the better way for order which the weight is under 10KG, it normally takes 4-7 days for delivery and delivery to your door directly.
Air Shipping is a good way for heavy order more than 100kg if you need the order urgently. It normally takes 7-10 days for delivery. But you need to do the customs clearance at your airport and pick the goods up there.
Sea Shipping is the lowest-cost way for big order, such as dental chair/dental unit order. It normally takes 30-60 days for delivery. But you need to do the customs clearance at your seaport and pick the goods up there.
The shipping cost which we charge you when you do the Checkout on our website is just for the Express shipping cost, if you want to use a cheaper shipping way, such as Sea Shipping, you need to contact us for the quote.
For the Air Shipping and Sea Shipping, if you don’t want to take the trouble to do the customs clearance and just want goods delivery to your door, we also can do that for you in additional charge.
Import Tax
Different country will have different import tax rate for different items, some country even 0 import tax for dental equipment. So if you want to know the exact import tax rate of the products, you need to inquire your customs department. Our price is not including any import tax, you need to pay it to your customs when the package arrive your country. But you can inform us to make a low value shipping invoice for you to avoid high import tax.
Shipping Insurance
Shipping insurance covers any damage or missing for your order during the transportation, so we highly recommend you to buy it for your large amount order. The insurance premium are as follows:
a.For Express/Air Shipping/Sea Shipping, the insurance premium= the sum insured*1.1*0.0008, minimum insurance premium for each bill is USD 30.
b.For Air Shipping or Sea Shipping with door to door delivery service, the insurance premium= the sum insured*1.1*0.0013, minimum insurance premium for each bill is USD 30.
c.Deductible: USD300 or 0.5% of the sum insured of the whole consignment, whichever is higher.
If you want to buy the shipping insurance for your order, you can buy it together with your order here: Cargo Transportation Insurance,PICC
Let’s take an example for these three different shipping ways (Just for reference):
One set of R7 dental chair shipped to Toronto, Canada.
Package Size： 147*110*153CM
Package Gross Weight：285KG
The value on shipping invoice: USD$4980
Shipping Ways
Shipping Cost You Paid to Treedental (USD$)
import tax (USD$)(For Canada, no duty but 5% GST)
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customs clearance fee(USD$)
Delivery charge from airport/seaport to your door(USD$)
Insurance(USD$)
Total(USD$)
ExpressNew York, United States.
Shipping Ways
Shipping Cost You Paid to Treedental (USD$)
import tax (USD$)
Custom Duty(includ ISF)(USD$)
Seaport Local Charge (USD$)
Warehouse fee (USD$)
Delivery charge from airport/ seaport to your door (USD$)
Customs Clearance Fee (USD$)
Total (USD$)
Express
(DHL/UPS/FeDex/EMS) 1 set
Express
(DHL/UPS/FeDex/EMS) 5 sets
Air Shipping 1 set
2310 (From factory to your airport) 50 0 0 0 0 0 2360Air Shipping 5 sets
11550 (From factory to your airport) 250 0 0 0 0 0 11800Sea Shipping 1 set
450 (From factory to your seaport) 50 185 300 415 450 125 1925Sea Shipping 5 sets
545 (From factory to your seaport) 250 260 715 535 900 125 33301 set and 5 stes of R7 dental chair shipped toPackage Size： 147*110*153CM/SETPackage Gross Weight：285KG/SETThe value on shipping invoice: USD$4980/SET
Contact us to discuss your requirements of China High Temperature Sintering Equipment Price. Our experienced sales team can help you identify the options that best suit your needs.