Solidex Screw Retained Crown and Bridge

Screw-retained restorations offer the convenience of being easily removed and repaired, if need be. For this restoration, the ceramic is directly fired onto the abutment and the resulting abutment-crown complex is screwed into the implant. Screw-retained restorations can be utilized only if screw access is favorable.

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A screw-retained restoration may be fabricated if the screw access is favorable (long axis of the implant and screw access hole are located on the lingual of the incisal edge). First, the ceramic is directly fired onto the abutment and the abutment-crown complex can be easily screwed onto the implant. The possibility for retrieval or retightening and reassessing the abutment screw can be offered by this type of restoration.
The primary advantage of a screw-retained superstructure is the lower profile retention of the abutment system. Cemented prostheses require a vertical component of 5 mm or more to provide retention and resistance form. A crown height reduction of 2 mm may decrease the retention as much as 40% when the implant abutment is only 4 mm in diameter. The screw retained system is more resistant to removal forces than the cement abutment when the abutment height is less than 5 mm. The prosthesis should be screw retained if the crown height does not allow sufficient abutment height and surface for cementation.
Another advantage of screw-retained crowns is the absence of residual cement in the gingival crevice, which may cause irritation to the surrounding tissues and lead to increased plaque retention and inflammation, similar to an excess cement condition with crowns on natural teeth.
Easy to retrieve and repair
No residual cement in the peri-implant soft tissue
Restorations for insufficient occlusal space (at least 5mm of occlusal space is required)

Restoration Type	Cement Retaining	Screw Retaining
Advantages	Ease of splinting implants Reduced unretained restorations Easier correction of nonpassive casting Progressive loading Improved force direction of loads Enhanced esthetics	Ease of retrievability Efficient and predictable Low-profile retention (less occlusal space) No cement in the soft tissue peri-implant area Splinting nonparallel implants more than 30° Retention even for small dimension
Disadvantages	Hydrostatic pressure causes incomplete seating Residual cement causes peri-implantitis Less retention and risk of breakage of small abutment post diameter	Risk of prosthetic screw loosening Fracture risk of prosthetic screws Less esthetic restorations Lack of axial occlusal loads Increased risk of porcelain fracture Lack of progressive loading