Aim:
In Vitro study was conducted to compare the retention of CM LOC and locator attachment systems in retaining mandibular overdenture upon simulation of insertion-removal cycles.
Materials Abd methods:
Ten complete dentures were fabricated on a Stone model representing a completely edentulous mandible that was obtained by making an impression for an edentulous patient. The stone model was duplicated using laboratory addition silicone after placing single implant analogue in the Medline using a dental surveyor. Then the mold was duplicated using epoxy resin. The prefabricated dentures were divided into two groups. Group was set to receive the CM LOC attachment and the other group was set to receive the ball attachment. Using a universal testing machine, the retention was measured at base line, 500, 1000, 1500, and 2000 insertion and removal cycles using ROBOTA chewing simulator, which represents (o,3,6,9,12) month; Considering that the patient will remove the denture 4 to 5 times a day
Results:
There was a statistically significant difference between the two types of attachments. The CM LOC attachment showed a higher statistically significant mean difference when compared to locator attachment after 1000 cycles (9 months). It was concluded that CM LOC appeared to have a favorable retention over the locator attachment in the first year with less serviceability.