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The International Journal of Oral & Maxillofacial Implants
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Int J Oral Maxillofac Implants 33 (2018), No. 4     31. July 2018
Int J Oral Maxillofac Implants 33 (2018), No. 4  (31.07.2018)

Page 747-753, doi:10.11607/jomi.6214, PubMed:30024989


Comparative In Vitro Study of Implant-Supported Restorations: Implant-Abutment Complex With and Without Prosthetic Finishing Line
Agustín-Panadero, Rubén / Roig-Vanaclocha, Ana / Fons-Font, Antonio / Solá-Ruíz, María Fernanda
Purpose: The aim of this study was to evaluate the mechanical behavior of implant-supported cemented restorations placed on two types of abutment design, with and without a prosthetic finish line, evaluating fracture resistance and the type of fracture produced in the abutment-crown complex.
Materials and Methods: Eighty zirconia restorations supported by tapered implants were divided into two groups: group I, with 40 zirconia crowns cemented onto individualized zirconia abutments with a chamfered finish line (1 mm deep); and group II, with 40 zirconia crowns cemented onto individualized zirconia abutments without a finish line. All specimens underwent thermocycling and dynamic loading before static load testing to evaluate their fracture resistance.
Results: Fracture resistance values (N) and the type of fracture were analyzed. The mean fracture resistance was 462.1 ± 66.3 N in group I and 343 ± 40 N in group II. In group I, fractures were produced in the prosthetic fixation screw; in group II, all mechanical failures were produced in the transepithelial abutment's cervical area.
Conclusion: Group I specimens showed greater fracture resistance than group II. The fracture type in group I occurred in the prosthetic screw. Group II fractures occurred in the zirconium oxide abutment.

Keywords: BOPT, finish line, prosthetic cementoenamel junction, vertical preparation, zirconia implant