The Journal of Advanced Prosthodontics

The Korean Academy of Prosthodonitics (대한치과보철학회)
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Influence of preparation depths on the fracture load of customized zirconia abutments with titanium insert

  • Joo, Han-Sung (Department of Prosthodontics, School of Dentistry, Chonnam National University) ;
  • Yang, Hong-So (Department of Prosthodontics, School of Dentistry, Chonnam National University) ;
  • Park, Sang-Won (Department of Prosthodontics, School of Dentistry, Chonnam National University) ;
  • Kim, Hyun-Seung (RIS Foundation for Advanced Biomaterials, School of Dentistry, Chonnam National University) ;
  • Yun, Kwi-Dug (Department of Prosthodontics, School of Dentistry, Chonnam National University) ;
  • Ji, Min-Kyung (Department of Prosthodontics, School of Dentistry, Chonnam National University) ;
  • Lim, Hyun-Pil (Department of Prosthodontics, School of Dentistry, Chonnam National University)
  • Received : 2014.09.18
  • Accepted : 2015.03.18
  • Published : 2015.06.30
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Abstract

PURPOSE. This study evaluated the fracture load of customized zirconia abutments with titanium insert according to preparation depths, with or without 5-year artificial aging. MATERIALS AND METHODS. Thirty-six identical lithium disilicate crowns (IPS e.max press) were fabricated to replace a maxillary right central incisor and cemented to the customized zirconia abutment with titanium insert on a $4.5{\times}10$ mm titanium fixture. Abutments were fabricated with 3 preparation depths (0.5 mm, 0.7 mm, and 0.9 mm). Half of the samples were then processed using thermocycling (temperature: $5-55^{\circ}C$, dwelling time: 120s) and chewing simulation (1,200,000 cycles, 49 N load). All specimens were classified into 6 groups depending on the preparation depth and artificial aging (non-artificial aging groups: N5, N7, N9; artificial aging groups: A5, A7, A9). Static load was applied at 135 degrees to the implant axis in a universal testing machine. Statistical analyses of the results were performed using 1-way ANOVA, 2-way ANOVA, independent t-test and multiple linear regression. RESULTS. The fracture loads were $539.28{\pm}63.11$ N (N5), $406.56{\pm}28.94$ N (N7), $366.66{\pm}30.19$ N (N9), $392.61{\pm}50.57$ N (A5), $317.94{\pm}30.05$ N (A7), and $292.74{\pm}37.15$ N (A9). The fracture load of group N5 was significantly higher than those of group N7 and N9 (P<.017). Consequently, the fracture load of group A5 was also significantly higher than those of group A7 and A9 (P<.05). After artificial aging, the fracture load was significantly decreased in all groups with various preparation depths (P<.05). CONCLUSION. The fracture load of a single anterior implant restored with lithium disilicate crown on zirconia abutment with titanium insert differed depending on the preparation depths. After 5-year artificial aging, the fracture loads of all preparation groups decreased significantly.

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