J Dent Rehabil Appl Sci.  2020 Jun;36(2):61-69. 10.14368/jdras.2020.36.2.61.

Study of the fracture resistance of zirconia on posterior fixed partial dentures based on inter-abutment distance

• Park GB
• Shin SY

• KMID: 2503801
• DOI: http://doi.org/10.14368/jdras.2020.36.2.61

Abstract

Purpose
Zirconia fixed partial dentures with mandibular 2^nd premolar and 2^nd molar as abutments are fabricated and then the effects of inter-abutment distance on fracture resistance of zirconia fixed partial dentures is studied.
Materials and Methods
The materials used in this study are Cameleon S zirconia block and S2 zirconia block, which are divided into CS Group and S2 Group applying different inter-abutment distance for each material, and the sintered zirconia fixed partial denture was luted to the epoxy resin die using a temporary luting cement, and then the fracture resistance was measured by placing a 6 mm diameter hardened steel ball on the occlusal surfaces of the pontics and applying pressure at a cross head speed of 1.0 mm/min on a universal testing machine with a load cell of 5.0 kN.
Results
The fracture resistance of zirconia fixed partial dentures is not significantly affected by inter-abutment distance The fracture resistance of zirconia fixed partial dentures in CS Group was significantly higher in 15 mm of inter-abutment distance than in 13 mm and 17 mm of inter-abutment distance (P < 0.05). The fracture resistance of zirconia fixed partial dentures in S2 Group was not significantly different between the three groups (P > 0.05).
Conclusion
The fracture resistance of zirconia fixed partial dentures with mandibular 2^nd premolar and 2^nd molar as abutments does not significantly affected by the inter-abutment distance.

Keyword

zirconia; fixed partial denture; fracture resistance; inter-abutment distance

Figure

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  Fig. 1 Master steel die design.

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  Fig. 2 Design of zirconia fixed partial denture. Differency of color according to inter-abutment distance. (A) White 13 mm, (B) Blue 15 mm, (C) Purple 17 mm.

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  Fig. 3 Specimens of zirconia fixed partial denture. (A) CS 13 mm, (B) CS 15 mm, (C) CS 17 mm, (D) S2 13 mm, (E) S2 15 mm, (F) S2 17 mm.

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  Fig. 4 Photograph of fracture test of S2 zirconia fixed partial dentures.

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