Reasons and solutions of glass-ceramic chipping
1.Periodically calibrate milling machine according to the calibrating period to ensure the accuracy;
2.Record the using time of milling burs, overuse will cause burs over wear and tear.
Different restoration types of wear degree will be different, timely replace new milling burs;
3.The margin should be ensured adequate thickness during preparation, minimum 1mm..Otherwise, excessive hypotenuse or thin edge will cause crack edges.
4. After milling ,use the specialized grinding and polishing tools for glass-ceramic.