J Adv Prosthodont.  2017 Feb;9(1):22-30. 10.4047/jap.2017.9.1.22.

Comparison of the fracture resistances of glass fiber mesh- and metal mesh-reinforced maxillary complete denture under dynamic fatigue loading

• Im SM
• Huh YH
• Cho LR
• Park CJ

• KMID: 2368208
• DOI: http://doi.org/10.4047/jap.2017.9.1.22

Abstract

PURPOSE
The aim of this study was to investigate the effect of reinforcing materials on the fracture resistances of glass fiber mesh- and Cr-Co metal mesh-reinforced maxillary complete dentures under fatigue loading.
MATERIALS AND METHODS
Glass fiber mesh- and Cr-Co mesh-reinforced maxillary complete dentures were fabricated using silicone molds and acrylic resin. A control group was prepared with no reinforcement (n = 15 per group). After fatigue loading was applied using a chewing simulator, fracture resistance was measured by a universal testing machine. The fracture patterns were analyzed and the fractured surfaces were observed by scanning electron microscopy.
RESULTS
After cyclic loading, none of the dentures showed cracks or fractures. During fracture resistance testing, all unreinforced dentures experienced complete fracture. The mesh-reinforced dentures primarily showed posterior framework fracture. Deformation of the all-metal framework caused the metal mesh-reinforced denture to exhibit the highest fracture resistance, followed by the glass fiber mesh-reinforced denture (P<.05) and the control group (P<.05). The glass fiber mesh-reinforced denture primarily maintained its original shape with unbroken fibers. River line pattern of the control group, dimples and interdendritic fractures of the metal mesh group, and radial fracture lines of the glass fiber group were observed on the fractured surfaces.
CONCLUSION
The glass fiber mesh-reinforced denture exhibits a fracture resistance higher than that of the unreinforced denture, but lower than that of the metal mesh-reinforced denture because of the deformation of the metal mesh. The glass fiber mesh-reinforced denture maintains its shape even after fracture, indicating the possibility of easier repair.

Keyword

Complete denture; Glass fiber mesh; Fatigue loading; Fractography; Fracture resistance

MeSH Terms

Denture, Complete*
Dentures
Fatigue*
Fungi
Glass*
Mastication
Microscopy, Electron, Scanning
Rivers
Silicon
Silicones
Silicon
Silicones

Figure

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  Fig. 1 (A) Maxillary edentulous master cast, (B) 0.5 mm relief on cast.

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  Fig. 2 (A) Metal mesh framework, (B) Glass fiber mesh framework on cast.

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  Fig. 3 (A) Schematic representation of loading for experimental design. The arrow indicates the direction of the cyclic force, (B) Chewing simulator.

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  Fig. 4 Representative fracture patterns of complete dentures. Upper: resin complete dentures, Middle: metal meshreinforced complete dentures, Lower: fiber mesh-reinforced complete dentures.

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  Fig. 5 Fractured surface of the unreinforced resin complete denture; palate area of acrylic resin base. (A) White circle indicates pink fibers (× 100), (B), (C) River line pattern in higher magnification (× 400 and × 1,000). White arrow indicates direction of the river line propagation. Black points indicate scarps.

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  Fig. 6 Fractured surface of the metal mesh-reinforced complete denture; palate area of acrylic resin base. (A) Horizontal crack line (× 100). Trapezoidal material of the center is a part of metal mesh. (B) Gap between metal and acrylic resin. And river line pattern of acrylic resin (× 400). (C) Dimple and interdendritic fracture. White circle represents shrinkage cavity formation in casting (× 1,000).

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  Fig. 7 Fractured surface of the glass fiber mesh-reinforced complete denture; palate area of acrylic resin base. (A) Crisscross fibers are broken (× 100), (B) Broken acrylic resin and broom-like fiber ends (× 400), (C) Broken glass fibers (× 1,000), (D) Cracked fiber ends in resin matrix. White arrow represents clean separation of the fiber from the matrix (× 8,000), (E) The fiber ends exhibit radial features and acrylic resin shows the microflow. From this, white arrow represents direction of fractures (× 8,000).

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