Overdenture a complete or partial removable denture supported by retained roots that is intended to provide improved support, stability, and tactile and proprioceptive sensation and to reduce ridge resorption. (Mosby. Mosby's Dental Dictionary. Elsevier, 2004.).

AdvantagesPreserve alveolar ridgePossibly -support -proprioreception -retention (eventually) -stress distribution

DisadvantagesPoor oral hygiene-caries and periodontal diseaseSoft tissue undercuts -esthetics -retentionBreakage of denture -thin -stress concentration over abutments

Selection of abutment teethOne per quadrantNot adjacent teethUsually mandibular cuspids and premolarsMaxillary cuspids frequently cause esthetic and retention problems due to soft tissue undercuts

OverdenturesRegard as transitional - need perfect oral hygiene -daily non acidulated topical fluoride (sodium fluoride) Probably better to place 2 implants