J Adv Prosthodont.  2010 Dec;2(4):134-141. 10.4047/jap.2010.2.4.134.

A study on the fracture strength of collarless metal-ceramic fixed partial dentures

• Yoon JW
• Kim SH
• Lee JB
• Han JS
• Yang JH

• KMID: 1975188
• DOI: http://doi.org/10.4047/jap.2010.2.4.134

Abstract

PURPOSE
The objective of this study was to evaluate fracture strength of collarless metal-ceramic FPDs according to their metal coping designs.
MATERIALS AND METHODS
Four different facial margin design groups were investigated. Group A was a coping with a thin facial metal collar, group B was a collarless coping with its facial metal to the shoulder, group C was a collarless coping with its facial metal 1 mm short of the shoulder, and group D was a collarless coping with its facial metal 2 mm short of the shoulder. Fifteen 3-unit collarless metal-ceramic FPDs were fabricated in each group. Finished FPDs were cemented to PBT (Polybutylene terephthalate) dies with resin cement. The fracture strength test was carried out using universal testing machine (Instron 4465, Instron Co., Norwood MA, USA) at a cross head speed of 0.5 mm/min. Aluminum foil folded to about 1 mm of thickness was inserted between the plunger tip and the incisal edge of the pontic. Vertical load was applied until catastrophic porcelain fracture occurred.
RESULTS
The greater the bulk of unsupported facial shoulder porcelain was, the lower the fracture strength became. However, there were no significant differences between experimental groups (P > .05).
CONCLUSION
All groups of collarless metal-ceramic FPDs had higher fracture strength than maximum incisive biting force. Modified collarless metal-ceramic FPD can be an alternative to all-ceramic FPDs in clinical situations.

Keyword

Fracture strength; Collarless metal-ceramic fixed partial denture; Modified collarless coping; Porcelain margin

MeSH Terms

Aluminum
Bites and Stings
Collodion
Dental Porcelain
Denture, Partial, Fixed
Head
Resin Cements
Shoulder
Aluminum
Collodion
Dental Porcelain
Resin Cements

Figure

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  Fig. 1 The prepared specimen and copper anodes. A: Abutments fixed in stone, B: Copper anodes.

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  Fig. 2 Fabricated injection mold. A: Abutment part of mold, B: Assembled mold, C: Base part of mold.

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  Fig. 3 A: Group A, B: Group B, C: Group C, D: Group D, E: Duplicated PBT resin die, F: Four groups of metal-ceramic FPDs.

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  Fig. 4 A: Fabricated 60 metal-ceramic FPDs, B: Cemented FPDs.

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  Fig. 5 Fracture strength test. A: Load stylus, B: Stabilizing jig, C: Specimen with jig, D: Loading test.

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  Fig. 6 Fracture strength of metal-ceramic fixed partial dentures when subjected to vertical load application on the middle pontic.

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  Fig. 7 Fractured metal-ceramic fixed partial dentures. A: Group A, B: Group B, C: Group C, D: Group D.

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  Fig. 8 Fracture patterns of FPDs. A: Group A, B: Group B, C: Group C, D: Group D.

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  Fig. 9 Variants of fractures. A: Group A, B: Group B, C: Group C, D: Group D.

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  Fig. 10 Graphs during fracture test.

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