Influence of proximal supportive design of zirconia framework on fracture load of veneering porcelain

Okabayashi, Shigenori; Nomoto, Syuntaro; Satô, Tôru; Miho, Otoaki

doi:10.4012/dmj.2013-039

Cited by 13 publications

(7 citation statements)

References 22 publications

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“…Clinically, failure of an all-ceramic FPD usually involves chipping of the porcelainfacing material 20,22,28,29,34) , not chipping of the framework. In addition to the firing strength required to fuse the porcelain and the frame, deformation of the frame is also a cause of this chipping of the porcelain-facing material.…”

Section: Discussionmentioning

confidence: 99%

Effect of Connector Design on Fracture Resistance in Zirconia-based Fixed Partial Dentures for Upper Anterior Region

Ogino

Nomoto

Satô

2016

Bull. Tokyo Dent. Coll.

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The purpose of this study was to investigate the influence of the cross-sectional form and area of the connector on fracture resistance in three-unit zirconia fixed partial denture (FPD) frameworks for the upper anterior region. Sixty FPD framework specimens were fabricated using the CAD/CAM system. The cross-sectional form (Type I, II, or III) and area (9.0, 7.0, 5.0, or 3.0 mm 2 ) of the connectors differed. The specimens were fixed to a jig capable of applying a load axially to the abutment teeth at an angle of 135 degrees. Each specimen was subjected to fracture load measurements using a universal testing machine and cross-sectional microscopic examination. Fracture load fell significantly with a decrease in cross-sectional area (p<0.01). In terms of cross-sectional form, an isosceles triangle with a gingival base yielded the highest fracture load. These results suggest that the connector of a three-unit zirconia-based FPD framework for the upper anterior region should be triangular, have a gingival base, sufficient height in the loading direction, and a cross-sectional area of >5.0 mm 2 .

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Section: Discussionmentioning

confidence: 99%

Effect of Connector Design on Fracture Resistance in Zirconia-based Fixed Partial Dentures for Upper Anterior Region

Ogino

Nomoto

Satô

2016

Bull. Tokyo Dent. Coll.

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“…Clinically, failure in FPDs with zirconia frames frequently results from fracture of the veneer porcelain and infrequently from fracture of the zirconia framework 3) . The framework design is a major factor affecting fracture in veneer porcelain 12) . Thus, a strong frame design is believed to reduce tensile stress on veneer porcelain.…”

Section: Discussionmentioning

confidence: 99%

Effect of Connector Design on Fracture Resistance in All-ceramic Fixed Partial Dentures for Mandibular Incisor Region

Murase

Nomoto

Satô

et al. 2014

Bull. Tokyo Dent. Coll.

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Yttrium tetragonal zirconia polycrystal frameworks were prepared for all-ceramic fixed partial dentures (FPDs) for the mandibular incisor region. The effects of the cross-sectional area and morphology of the connector on its strength were evaluated by fracture tests. Nine types of zirconia framework for a 3-unit FPD for a defect of 1 mandibular central incisor were prepared, each differing in cross-sectional area and morphology. Fracture tests were performed by loading until fracture using a universal testing machine. Fracture load was determined and fracture site examined. Significant differences were observed in fracture load according to the morphology and crosssectional area of the connector (p<0.05, p<0.01, p<0.001). Fracture load differed significantly among all groups according to cross-sectional area, and was also greater when the shape of the connector formed an isosceles triangle widest at the base and the connector had the same height and width. These values still far exceeded 311 N, however, which is the average occlusal force in the incisor region. The results of this study suggest that connector design affects fracture load.

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“…In literature, there are many studies that have been done to compare modified and standard coping designs, but with different modifications of the framework and different failure testing methods. Modifications in framework design included collared designs (8,13,(31)(32)(33), anatomical cut back designs (5,19,34), and also included addition of ribs or horizontal embossments (35,36). Testing methods included single load to fracture (8,20,31), reliability and survival rate after fatigue testing (4,5,13,14), measuring the number and total area of chipping (37) and Finite Element Analysis (FEA) (36).…”

Section: Discussionmentioning

confidence: 99%

The Effect of Complete and Partial Contour Zirconia Copings on the Fracture Resistance of All Ceramic Restorations

Raheem

Kader

Abbassy

2018

Alexandria Dental Journal

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INTRODUCTION Veneer chipping is a common failure of zirconia based restorations, especially in the presence of high occlusal loads. Modifying zirconia design may influence veneer chipping. OBJECTIVES: Purpose of this study was to evaluate fracture resistance of complete and partial contour zirconia crowns. MATERIALS AND METHODS: Twenty standardized epoxy resin dies, prepared to receive zirconia based crowns, were divided into 4 groups, 5 specimens each. Zirconia framework designs were: (a) Full contour zirconia crown (FC), (b) Partial contour zirconia coping with buccal veneering (PC), (c) Anatomically reduced zirconia coping with palatal and proximal collar (ARD) and (d) half mm zirconia coping without collar (CON) (control group). Dual scanning technique was done for the test groups to fabricate zirconia copings with the use of standardized resin patterns, while normal scanning was made for the control group. After milling and sintering of zirconia specimens, veneering was done for all desired surfaces. All crowns were adhesively luted to their corresponding dies, and subjected to thermal cycling and mechanical loading corresponding to one year clinical service. Single load to fracture was applied to all the specimens. Type of failure was recorded for each specimen, investigated visually then by using Stereomicroscope and SEM. RESULTS: Complete and partial contour zirconia restorations showed high resistance to fracture. The presence of collar was insignificant for increasing fracture resistance, but had an influence on the fracture extension toward the proximal surface of the veneered restorations.

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Influence of proximal supportive design of zirconia framework on fracture load of veneering porcelain

Cited by 13 publications

References 22 publications

Effect of Connector Design on Fracture Resistance in Zirconia-based Fixed Partial Dentures for Upper Anterior Region

Effect of Connector Design on Fracture Resistance in Zirconia-based Fixed Partial Dentures for Upper Anterior Region

Effect of Connector Design on Fracture Resistance in All-ceramic Fixed Partial Dentures for Mandibular Incisor Region

The Effect of Complete and Partial Contour Zirconia Copings on the Fracture Resistance of All Ceramic Restorations

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