After the porcelain crown if you need to clean the teeth, you can also choose manual scaling. In addition, after the porcelain crown if you choose ultrasonic scaling method, as long as the method is correct, careful is not easy to wash bad porcelain teeth, sandblasting is generally to pigment and a small amount of calculus, the general tartar with sandblasting is very difficult to remove clean, if you are afraid of ultrasonic scaling will damage the porcelain teeth can also choose to use manual scaling. However, it should be noted that although the scaling is not so bad as to wash the porcelain crown, but when using ultrasonic scaling machine, if you are not careful, the adhesive of the porcelain crown may be shaken loose and fall off, thus forming a gap between the real tooth and the porcelain crown, resulting in secondary caries or porcelain crown loss, so you must pay more attention when scaling the tooth.