Classification of Removable Partial Dentures
Classification by structure and material
1. Cast stented dentures
The main structure of the denture is an integrally cast metal bracket, and structures such as artificial teeth and bases are attached to the cast bracket. Commonly used metal materials are cobalt-chromium alloy and titanium metal.
2. glued dentures
The artificial teeth of the denture and the retaining ring and other structures are connected into a whole by the plastic base. The material is methyl methacrylate.
Classification by support
1. Tooth-supported dentures
When there are few missing teeth and there are relatively stable remaining teeth before and after the missing teeth, the occlusal force of the artificial teeth is borne by the natural teeth before and after the missing teeth. Tooth-supported dentures have good retention, stability and support, and the restoration effect is good.
2. Hybrid Support Dentures
When there are no remaining teeth behind the edentulous area, or the number of missing teeth is large and the gap is long, the occlusal force borne by the artificial teeth of the denture is partly borne by the natural teeth adjacent to the gap, and the other part is borne by the alveolar ridge covered by the denture base. That is, the occlusal force is shared by the natural teeth and the alveolar ridge. Such dentures are prone to unstable phenomena such as warping and rotation, the adjacent abutments of the free gap are prone to torsion damage, and the alveolar ridge is prone to bone resorption and mucosal tenderness. Restorative effects are not as good as tooth-supported dentures.
3. Mucosal Support Dentures
When there are too many missing teeth and the periodontal health of the remaining teeth is poor and cannot provide support, the occlusal force of the artificial teeth of the denture is completely borne by the alveolar ridge under the denture base. The repair effect of mucosa-supported dentures is not good, and it is prone to tenderness and bone resorption. The scope of the base should be expanded as much as possible to disperse the occlusal force.