Lithium Disilicate User Instruction

Product catalog summary

Introduction
The document provides user instructions for lithium disilicate, highlighting its advantages and chemical characteristics.

Advantages

Excellent aesthetics and restorative effects.
High chemical stability and flexural strength.
Easy milling process that preserves tool life.
Simple and fast crystallization process, saving operation time.
Unique chameleon property for superior restorative effects.

Chemical Characteristics
The main component of the glass ceramics is lithium disilicate, produced through a special process. It offers a simple, fast crystallization process and excellent aesthetic results, making it a top choice for CAD high-efficiency, high-strength restorations. The composition includes:

Silicon dioxide (SiO2): 55%-65%
Lithium oxide (Li2O): 15%-25%
Aluminium oxide (Al2O3): 2%-12%
Potassium oxide (K2O): 2%-12%
Other oxides: 0%-10%

Preparation

Shoulder preparation should avoid angles and sharp edges, with a rounded inner edge or slope.
A space of 1mm is required for ideal milling results under CAD/CAM processing.
Inlay and onlay preparations should have a depth of no less than 1mm, with separating edges of groove areas also no less than 1mm.

Scanning
Use a scanner with an accuracy of 20-30 um to obtain data modules and transfer scanning data to CAD design software.

Design
Using CAD software, the sintering factor of glass ceramics is 0.2%. It is advised to design based on a 1:1 ratio.

Type Setting

Ensure the size data of glass ceramics in the software matches the real size; if not, select a slightly larger size.
The size of the connecting bar should be conical, with specific cross-section dimensions.

Milling

Avoid using burs with a milling capacity of 10 restorations or more.
Ensure sufficient milling liquid is sprayed fully on the bur tip.
Maintain air pressure at 6-8 bar, ensuring no liquid or oil contamination.

Sintering
The product appears purple before sintering and crystallizes to the desired color after sintering. Follow the sintering program strictly to control temperature and time.

Staining & Glazing
Use special glaze paste and adhere to the firing program for sintering. The recommended glazing program includes specific temperature and time settings.

Catalog excerpts

lithium Disilicate User Instruction [introduction] Glass ceramics’ main component is Lithium Disilicate and is produced through special process. It features simple, fast crystallization process and supreme esthetics result , therefore has become top material choice for CAD high eﬃciency, high strength restorations. 1.Chemical characteristics Composition Mass percentage Lithium oxide Silicon dioxide Aluminium oxide Potassium oxide Other oxide 2.Advantages Excellent esthetics & restorative eﬀect. Supreme chemical stability and ﬂexural strength. Easy milling, preserved tool life. Simple and fast crystallization process, save operation time. Unique chameleon property guarantees excellent restorative eﬀect. Mass percentage [Making process] 1.Preparation Shoulder preparation Not suitable for preparation in angle and sharp edge area. Shoulder should be prepared to rounded inner edge or slope. It is required to have space of 1mm to make sure blocks achieve ideal milling result under CAD/CAM processing. Inlay preparation： 1.Depth of Inlay preparation should be no less than 1mm; Separating edge of groove area should be no less than 1mm. 2.Onlay preparation: depth of onlay preparation should be no less than 1mm; Separating edge of groove area should be no less than 1mm. 2.Scanning Use scanner with scanning accuracy of 20-30 um to obtain data module and transfer scanning data to CAD design software to design. 3.Design Using CAD software. Sintering factor of glass ceramics is 0.2%. It is advised to design based on 1:1 ratio during design. 4.Type setting ① When using typesetting software to set type, size data of glass ceramics in software should be same as real glass ceramics; if there is no same size, selected size data in software should be a bit bigger than real size. ② In typesetting, size of connecting bar should be cone. Cross section of one end connecting restoration is 2.5-3.0mm². The other end is 4.0-5.0mm². 5.Milling ① Do not use burs with milling capacity of 10 restorations or above to mill glass ceramics. ② During milling, suﬃcient milling liquid should be provided and guaranteed to be sprayed fully on bur tip. ③ During milling, air pressure should be maintained at 6-8 bar, and neither liquid nor oil is contained in air to avoid contamination. 6.Sintering This product shows purple before sintering. After sintering , it crystallizes and restoration shows desired color. Please comply strictly with sintering program to control sintering temperature and time. Glass ceramics sintering program： Start temp Start temp 7.Staining & glazing Use special Glaze Paste. After staining & glazing, please comply strictly with ﬁring program to sinter. Recommended glazing program： 500℃

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