1.partial framework are cast to fit the teeth. Since they sit on the teeth, as well as being attached to them, they are extremely stable and retentive.
2. The teeth have been altered slightly beforehand in order that the partial denture can rest upon them without interfering with the way the patient bites the teeth together.
3.The metal framework does not contact the gums. Thus, as the gums resorb, this type of partial does not sink with them and rarely requires relines. Because the teeth are altered by the dentist beforehand, there are fewer limitations in the placement of clasps, and they are less likely to be seen than the wrought wire clasps of the treatment partial.
4. The largest single advantage that cast metal framework partial dentures have over the newer flexible framework partials (covered below) is that sore spots are almost never an issue since neither the framework, nor the plastic extensions contact the soft oral tissues with any force!