Fracture Strength Study of Internally Connected Zirconia Abutments Reinforced with Titanium Inserts

• Autores: Hyo Jung Chun, In Sung Yeo, Joo Hee Lee, Seong-Kyun Kim, Seong-Joo Heo, Jai-Young Koak, Jung Suk Han, Shin Jae Lee
• Localización: The International Journal of Oral & Maxillofacial Implants, ISSN-e 0882-2786, Vol. 30, Nº. 2, 2015, págs. 346-350
• Idioma: inglés
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  • Purpose: The implant-abutment connection area is known to be the weakest part of an internal-connection zirconia abutment and therefore the most likely to fracture. The aim of this study was to evaluate the complementary effect of a titanium insert on the fracture strength of a zirconia abutment. Materials and Methods: Three types of abutments with internal connection structures were selected and assembled: titanium abutment–titanium abutment screw (Ti-Ti), zirconia abutment–titanium abutment screw (Zr-Ti), and zirconia abutment–titanium insert–titanium abutment screw (Zr+Ti-Ti). Fifteen abutments and 15 implants were used and divided into three groups of five specimens each. Compressive loading was applied to the specimens at 30 degrees off-axis with dislocation speed of 1 mm/min and was increased until deformation occurred. Results: The Ti-Ti specimens showed the highest maximum fracture load, followed by the Zr+Ti-Ti specimens; the Zr-Ti assemblies were the weakest. Significant differences in fracture strength were found between the groups. All of the investigated Zr abutments fractured. However, in the Zr+Ti-Ti specimens, 60% of the Ti abutment screws fractured and 40% bent, whereas all of the abutment screws in the Zr-Ti group were only bent. Conclusion: The Ti insert, as a substitute for the weakest part of a Zr abutment in an implant with an internal friction connection, can reinforce the fracture strength of a Zr abutment