In-vitro investigation of the effect of A new anti-magnetic abutment design on the retention in extraoral implants

Magnet attachments are widely used in maxillofacial prostheses. In addition to many advantages of magnet attachments, there are also disadvantages such as the need to remove the magnetic abutments during the magnetic resonance imaging (MRI) and their negative effects on cells. This in-vitro study aims to evaluate the retention of new types of anti-magnetic abutment designs developed as an alternative to routinely used magnetic abutments. For this purpose, the retention of the new type of anti-magnetic abutments produced from Ti6Al4V alloy were compared to the extraoral implants currently in use. 4 groups were determined in the study and 10 samples were prepared for each group. 1st group is conventional magnetic system (GMS-control group), 2nd group conventional magnetic system heated at 100 ° C (IGMS), 3rd group anti-magnetic abutment type 1 system (AMS1) and 4th group anti-magnetic abutment type 2 system (AMS2). The samples were placed in the test system, after the test system was prepared. The dislodging forces were measured at cycles 0, 120, 360, 720, 1440. The retention values were measured as GMS: 3.39 N, IGMS: 3.38 N, AMS1: 8.83 N, AMS2: 8.75 N at the end of 1440 cycles, respectively. Two way ANOVA repeated measures were used to evaluate the results and compare the extraction forces of different abutment-attachment systems. AMS groups and GMS groups showed similar results within themselves (p> 0.05). A statistically significant difference was found between GMS and AMS1, GMS and AMS2 (p <0.05). As a result, it has been observed that the retention strength of the new type of anti-magnetic abutments has higher values and can be an alternative to magnetic abutments.