Maxillary Implant-Supported Overdentures: Mechanical Behavior Comparing Individual Axial and Bar Retention Systems. A Cohort Study of Edentulous Patients.

At the same time, the ODB group presented a higher number of mechanical events affecting the prosthetic teeth (wear or fracture), as well as more complications derived from loosening or loss of the retention screws between bar and implants, although the differences between the groups did not reach statistical significance.

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Taking an overall view of the results, comparing events or complications between the two types of retention ( Table 1 ), the ODA group suffered more problems related to retention loss, retention insert changes, resin fracture, and relining while the ODB group suffered more prosthetic dental wear, screw loosening, and complete prosthetic failure, although differences were nowhere near statistical significance ( Figure 2 ).

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