Dr. Chandur Wadhwani and Dr. Alfonso Pinyero conducted a study to compare the effect of implant abutment modification on the amount of cement extruded at the crown-abutment margin and evaluate the vertical discrepancy after cementation. Their findings were published in the International Journal of Oral & Maxillofacial Implants.
Access openings of titanium abutments were modified with an opening and placement of two vent holes 3 mm from the occlusal edge and 180 degrees apart. Access openings were filled with resin material and used as controls. Each abutment was secured to an implant analog. Eugenol-free zinc oxide cement (TempBond NE) was selected to cement the cast crowns (n = 9) onto test abutments. The amount of cement extruded out of the margin was calculated, and vertical seating discrepancies were determined with a linear transducer device before and after cementation. Differences among groups were analyzed statistically.
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