Influence of preparation depths on the fracture load of customized zirconia abutments with titanium insert.
- Author:
Han Sung JOO
1
;
Hong So YANG
;
Sang Won PARK
;
Hyun Seung KIM
;
Kwi Dug YUN
;
Min Kyung JI
;
Hyun Pil LIM
Author Information
- Publication Type:Original Article
- Keywords: Dental implant; Zirconia abutment; Titanium insert; Fracture load; Preparation depth; Artificial aging
- MeSH: Aging; Axis, Cervical Vertebra; Crowns; Dental Implants; Incisor; Linear Models; Lithium; Mastication; Titanium*
- From:The Journal of Advanced Prosthodontics 2015;7(3):183-190
- CountryRepublic of Korea
- Language:English
- 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 4.5x10 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: 5-55degrees 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 +/- 63.11 N (N5), 406.56 +/- 28.94 N (N7), 366.66 +/- 30.19 N (N9), 392.61 +/- 50.57 N (A5), 317.94 +/- 30.05 N (A7), and 292.74 +/- 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.
