Date of Graduation


Document Type


Degree Type



School of Dentistry


Not Listed

Committee Chair

Mike Bagby.


Objectives. To collect data for the retentive capabilities of mini dental implants in several numbers and positions when used with the mandibular overdenture; and compare that information to previous studies on the dislodging forces of locator attachments.;Methods. Acrylic blocks representing the mandibular arch and a mandibular denture were laboratory fabricated in high impact denture acrylic resin (Lucitone 199). Five mini implants were placed in the mandibular block and associated housings were picked up into the mandibular denture block using fast set acrylic (Super T). The denture block was then attached, via the same fast set acrylic, to an aluminium plate with a perpendicular screw for connection to the Instron Universal Testing Machine. Twenty pulls for each of the seven combinations of mini implants were recorded.;Results. Up to 20 tests for each group were recorded and the data was analyzed via Jump Software. The mean force to dislodgement for the seven groups were recorded in Newtons and are as follows: 1MDI- 4.13, 2MDIs narrow- 7.84, 2MDIs wide- 13.49, 3MDIs narrow-18.50, 3MDIs wide- 19.54, 4MDIs- 24.10, 5MDIs- 26.86.;Conclusions. Mini Dental Implant Overdentures are an acceptable alternative when traditional implants are not indicated. The data in this study leads to a recommended number of mandibular overdenture mini dental implants to be four, as five did not significantly increase the retention. Position affected the amount of retention only when using two mini dental implants, in which case a wide orientation was more retentive.