Dental materials are divided into short and long term it?

　　According to internationally renowned expert Professor Cui Rongshuo oral description, by filling the hole of the nest material remain in the teeth and the maintenance and retention time can generally be divided into short-term dental materials and long-term use of materials, use of materials. Long-term use of the material is what we usually refer to the permanent filling materials, dentin defects in the cave instead of the long-term retention. Common long-term dental material amalgam, composite resin.

原文翻译如下：