Patent ID: 8403671

Claim:
A detachment-prevented removable double-crown prosthetic appliance, comprising: an internal crown member, which has an outside surface to which two resilient retention clamping strips are mounted, each of the resilient retention clamping strips comprising a root section that is fixed to the outside surface of the internal crown member and a spring section extending from the root section, the spring sections of the resilient retention clamping strips being spaced by a gap that has a reduced neck portion forming a pass; and an external crown member, which is removably mounted to the internal crown member and has a lower inner portion forming a fitting chamber for removably fitting over the internal crown member, the fitting chamber having an inside surface that forms a retention block that is engageable with the resilient retention clamping strips by moving through the pass so as to force the spring sections of the resilient retention clamping strips to expand and deform outward, the spring sections allowing to return after the retention block moves through the pass to shrink back to clamp and thus retain the retention block, whereby the external crown member is securely coupled to the internal crown member in such a way that the external crown member is not allowed to undesirably detach; wherein each of the resilient retention clamping strips comprises a spring force enhancing section extending from the root section and located outside the spring section, the inside surface of the external crown member forming two inward projecting inclined support surfaces, which are respectively engageable with the two spring force enhancing sections of the resilient retention clamping strips for providing additional spring forces.