The following guidelines must be considered in the maximum length for cantilever design of fixed prosthesis in dental implants.
1. A rigid cantilever on a single fixture is contraindicated.
2. The maximum cantilever length design for a linear fixture arrangement using two to three fixtures is approximately equal to the length of the implant fixture arrangement.

Rigid cantilever on a single fixture is contraindicated
With the increasing number of implant pratitioners, the dental laboratories need to be ready to support the demand for implant supported dentures. There are requirements needed in fabricating both fixed and removable dentures. Both dentists and dental technicians should have a common understanding of the techniques and procedures involved. Protocols for both dental clinics and dental laboratories should be established and observed as they work together on implant cases.
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Implant supported crown is a good replacement for a missing single tooth.
Dental Implant supported crowns have the following advantages:

Dental implants will maintain the surrounding bone and soft tissue.
Fully bone anchored denture in maxilla can cause problems in phonation. This is due to space between prosthesis and the residual tissues. The use of artificial gingiva resolves phonetic problems due to this space.
Artificial gingiva can be fabricated using a direct sprinkle-on technique with self-cure resin. It can also be done by doing a wax-up and processing with heat-cured resin or silicon material. Artificial gingiva, also known as gum pad, is placed labially between the prosthesis and residual tissues. The artificial gingiva should be cleaned following methods for a removable denture.

Artificial Gingiva for Dental Implants
Overdenture treatment is a good alternative to a fully bone anchored denture. It is an effective method of treatment for many types of patients.
Overdentures supported by dental implants showed a more consistent chewing pattern. Implant hygiene maintentenance is also less complicated because fewer implants are used. Using fewer dental implants is a financial advantage for the patient.