Modulo deformation Causes and Treatment

Which the porcelain crown, a perfect restoration is the perfect match between need an accurate model, and the doctors and technicians to do. Often because the model deformation to the processing plant rework is no longer a minority, the following that the causes and treatment of a few model deformation.

       

Of course, not simply a model of deformation is the way; there are also some seasonal reasons, such as: spring, summer, autumn and winter when the season processing plants due to model deformation and rework repair experience greatly increased. Gypsum in 10 ° C to 18 ° C is the most prone to change, there is also closely related to the house air humid, so model deformation occurs when the season things often! Only in this way need closer co-ordination between doctors and technicians. Without mutual complaints to shirk its responsibility, this is the nature gave us trouble!

       

Season to the doctors and technicians trouble, I said here a few treatment methods.

1. The doctor from the patient's mouth to remove the model, impression 5 to 8 ° C warm water and then dry, poured into the ultra-anhydrite can not be too thin or too thick. Plaster too thin, after the model of curing is very strong and very fuzzy model of the shoulder. Plaster too thick, it is likely to produce the shoulder to take incomplete. Not to the ordinary white plaster and dental equipment die stone mix. Plaster the more dilute model is more solid, denser and stronger.

2. Poured into the die stone, do not model on the sun exposure, can not wait for curing on the damp or water should be placed to ensure a constant temperature, dry curing, so as to reduce the chance of deformation of the model. Because ultra-anhydrite chemical reaction producing heat, there will be slight changes on the sun exposure to make the model of severe expansion. Crown loose or package gingival phenomenon will occur in the restoration completed into the patient’s mouth. Chemical reaction, such as ultra-anhydrite, if too cold and Your teeth need to be corrected vice versa.

3. Removed from the three hours poured into the die stone model, doctors must carefully check the model, right shoulder and neck edge trim so that the technician in the production of which can be clearer to see the exact location of the shoulder and neck edge, so production out of the prosthesis can be regarded as a perfect restoration.