1. Experimental Sample、Equipment、Parameter

Sample：Bloomden Products 3D-pro-ml-A1、3D-pro-ml-A2、3D-pro-ml-A3

Equipment：Bloomden Sintering Furnace Model#：B1700

Experiment comparison of sintering system:

a. Bloomnden 3D series products recommended sintering temperature curve

b. 1530℃sintering temperature curve

2. Experiment result and conclusion

Comparison picture ：Sample pictures after sintering (left 1530℃,right 1480℃）

3D-pro-ml-A3

3D-pro-ml-A2

3D-pro-ml-A1

Conclusion:As experiment result, 1480℃ is more recommend sintering temperature than 1530℃.At the sintering temperature of 1530℃ ,all color of 3D-pro-ml-A1、3D-pro-ml-A2 and 3D-pro-ml-A3 are lighter than 1480℃.After sintered at 1530℃,the color of 3D-pro-ml-A3 tooth is more like A2, and 3D-pro-ml-A1 and 3D-pro-ml-A2 is lighter than A1 on color sheet.

3. Analysis and Suggestion

Analysis：As result of the material of 3D series products is a multi-powder mixture and it`s contain many high permeability UT powder.Considering the suggested sintering temperature range of UT powder is 1430℃——1480℃,which is much lower than 1530℃.Therefore,when sintered products at 1530℃ will cause abnormal growth of zirconia crystals in the product and affect the color of the product.

Sugesstion :We recommend 3D products are sintered at temperature of 1480℃,and the temperature range should not exceed 1450℃ - 1500℃.