S-Space College of Dentistry/School of Dentistry (치과대학/치의학대학원) Dept. of Dentistry (치의학과) Journal Papers (저널논문_치의학과)
Fracture strength study of internally connected zirconia abutments reinforced with titanium inserts
- Chun, Hyo-Jung; Yeo, In-Sung; Lee, Joo-Hee; Kim, Seong-Kyun; Heo, Seong-Joo; Koak, Jai-Young; Han, Jung-Suk; Lee, Shin-Jae
- Issue Date
- Quintessence Publishing
- International Journal of Oral and Maxillofacial Implants, Vol.30 No.2, pp. 346-350
- 복합학; dental implant abutment; fracture strength; internal connection; titanium insert; zirconia
- 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 assembles 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 fractures and 40% bent, whereas all of the abutment screws in the Zr-Ti group were only bent.Conclusions: 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.
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