Problems associated with a complete denture, such as lack of stability and retention, can be solved with the use of overdentures. Historically, this technique was an attempt on the part of a few innovative dentists to provide their patients with retention and stability

beyond that which could be achieved with a regular complete denture 1. Teeth supported or an implant supported overdenture helps improve the retention and stability of the final prosthesis significantly. Bone is a dynamic tissue. The extraction of teeth results in the initiation of the bone resorption pattern. However, when tensile stress is received by bone, additional bone formationtakes place. Such stresses occur when occlusal forces are transmitted to the alveolar bone by the periodontal ligament. This principle helps preserve bone1,2. The concept of overdentures may not be the elixir, but it is a positive means for delaying the process of complete endentulism and helps in the preservation of bone. To top it all, it gives the patient the satisfaction of having prosthesis with his natural teeth still present. In this article, case reports with three different types of Overdentures are discussed: Overdenture with cast copings with short dowels, O-ring attachments, a customized bar supported overdenture with copings and in cases where the teeth cannot be preserved we opt for implant supported overdenture1,3

Key words: Bar supported overdenture, bone preservation, bone resorption, cast copings, O-ring attachment, tooth retained overdenture, implant supported overdenture .test guident

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