Ceramic porcelain teeth how to avoid collapse

Ceramic porcelain teeth collapsing in clinical have occurred, could not remedy, can only be removed broken crown, it is such a headache, the reason for this, the main craft techniques, design and preparation of the teeth and in patients with chewing habits and other factors .
      Clinical cases of choice, for more missing teeth bridge, the abutment of the periodontal ligament of the area to try and missing teeth area larger than the size of the periodontal ligament and, near the missing gap side of the lip-cheek teeth to shoulder Wide (larger than 0.6 mm), to ensure that its metal edge of the crown thickness of greater than 0.3 mm, because here in chewing at the greatest stress, it is easy to collapse porcelain, single-ended fixed bridge theory is unscientific and should do Fixed - the restoration activities, such as must be done, its side near the vacancy gap should be made of metal or ring-shaped metal crown side of the bridge reducing its basement into a saddle-face design, as far as possible and increase the Organization of the contact area .
     Preparation of teeth when the jaw teeth elongation or excessive wear off sharply after the ridge should be appropriate for grinding, the surface of the teeth particularly maxillofacial have enough space (2-2.5 mm), ensure that there is sufficient porcelain layer thickness .
      Under doctor's orders to patients in time to repair the objective description of the characteristics of patients with the correct guidance of the chewing habit.
      Generation of skilled workers when production undercut Motian enough and do a good job of porcelain tooth crown free trials at the neck may be collapsing on the porcelain.
      Production of wax-the most important, the current domestic rarely used law to cut production in the crown, if left to the porcelain layer of space is too large, low-bending strength ceramic materials easily cracked, because the ceramic thermal expansion coefficient lower than the metal, cooling down after the completion of sintering The stress is too large, porcelain in the car when it may Benglie, Dai to the post because I did not stress release, it is easy to Benglie. If the left of the room is too small porcelain, ceramics strength达不到要求. In the crown of the ridge of wax should be done more blunt round, so as to avoid a ceramic shear role in the car should also be attention to this point, grinding, sandblasting the highest good, the size must not alumina low (80 -- 100 heads), to increase the size of the interface and porcelain of the chimeric.
    Porcelain, plastic water can not be excessive, especially in the transition between each floor, the need to control the humidity good porcelain. Car porcelain contacts with the grinding head can not have too much vibration, for jaw when forced to light, the best use of other methods of percussion
     At present foreign popular low-temperature ceramic Vickers hardness of its 400 HV02 in the following general, and the traditional high-temperature ceramic compared with more than 600 HV02, closer to the natural enamel 300-350 HV02 hardness, but not easy to collapse ceramic, porcelain manufacturers are domestic To promote the market.