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Journal of Peking University (Health Sciences) ›› 2021, Vol. 53 ›› Issue (2): 402-405. doi: 10.19723/j.issn.1671-167X.2021.02.028

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Evaluation of fracture strength of two kinds of zirconia all-ceramic crowns with different edge compensation angles

YANG Xin1,LI Rong2,YE Hong-qiang1,CHEN Hu2,WANG Yong2,ZHOU Yong-sheng1,Δ(),SUN Yu-chun2,Δ()   

  1. 1. Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
    2. Center for Digital Dentistry, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
  • Received:2019-02-22 Online:2021-04-18 Published:2021-04-21
  • Contact: Yong-sheng ZHOU,Yu-chun SUN E-mail:kqzhouysh@hsc.pku.edu.cn;polarshining@163.com
  • Supported by:
    National Key Research and Development Program of China(2018YFB1106900);National Key Research and Development Program of China(2018YFB1107200);Capital’s Funds for Health Improvement and Research(2018-2-4103)

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Abstract:

Objective: To evaluate the effects of different edge compensation angles on the fracture strength of multilayer zirconia all-ceramic crowns and traditional uniform zirconia all-ceramic crowns. Methods: The resin tooth preparation specimen of the mandibular first molar with a knife-edge was fabricated. A 3D digital model of the specimen was obtained by scanning it with a 3D dental model scanner. The 3D digital model was imported into computer aided design (CAD) software, and three 3D digital models of the full crown with the same surface shape are designed with the edge compensation angles of 30°, 45° and 60°, respectively. Then, the designed 3D digital model is imported into computer aided manufacturing (CAM) software. Three kinds of multilayer and homogeneous zirconia all-porcelain crowns with different edge compensation angles were fabricated,10 each for a total of 60. The fracture load of each crown was measured under the electronic universal testing machine. Results: Fracture load of multilayer and uniform zirconia all-ceramic crowns, (4 322.86±610.07) N and (5 914.12±596.80) N in the 30° group, (5 264.82±883.76) N and (5 220.83±563.38) N in the 45° group and (4 900.42±345.41) N and (5 050.22±560.24) N in the 60° group, respectively. The fracture load of multi-layer zirconia all-ceramic crowns in the 30° group was significantly lower than that of homogeneous zirconia all-ceramic crowns(P<0.05); there was no statistical significance in 45° group and 60° group(P>0.05). In the multi-layer zirconia all-ceramic crowns: the fracture load of the 30° group was significantly lower than that of the 45° group (P<0.05); there was no significant difference between the 30° group and the 60° group, the 45° group and the 60° group (P>0.05).In uniform zirconia full crown group: the 30° group was higher than the 45° group, the 30° group was higher than the 60° group (P<0.05), and there was no significant difference between the 45° group and the 60° group (P>0.05). Conclusion: The fracture loads of three kinds of uniform and multilayer zirconia all ceramic crowns with different edge compensation angles can meet the clinical requirements. A smaller edge compensation angle is recommended when using traditional zirconia all-ceramic crowns, while 45° is recommended when using multi-layer zirconia all-ceramic crowns.

Key words: Zirconia all-ceramic crown, Knife-edge, Edge compensation angle, Fracture strength

CLC Number: 

  • R783.4

Figure 1

Resin tooth preparation"

Figure 2

Schematic diagram of edge compensation angle a, horizontal edge of the crown; b, tilted edge of the crown; α, compensation angle of the edge of the crown."

Figure 3

CAD/CAM design and processing of three different crown edge A, B, C, CAD software design completed; D, E, F, completion of CAM processing, which is consistent with the design perspective. CAD, computer aided design; CAM, computer aided manufacturing."

Figure 4

Fracture strength test"

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