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PurposeThe purpose of this study was to compare the retention of circlet (E) clasps and back‐action clasps against three abutment surface materials during long‐term simulation of attachment and detachment.
Material and MethodsForty‐eight test models were constructed by placing premolars (natural abutments or metal dies) inside metal blocks to test different abutment retention surface materials (sound...
Purpose: The purpose of this in vitro study was to measure the loss of retention and wear of two clasp types (E‐circlet, back action) against three abutment materials (enamel, composite, CAD/CAM ceramic) after 16,000 simulated cycles of attachment‐detachment.
Materials and Methods: Forty‐eight models were constructed by placing either an upper first premolar or a metal die inside a metal rectangular...
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