In vitro fracture resistance of molar teeth restored with a short fibre-reinforced composite material

Márk Fráter, András Forster, Márk Keresztúri, Gábor Braunitzer, K. Nagy

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Objectives The purpose of this in vitro study was to evaluate the efficiency of a short fibre-reinforced composite (SFRC) material compared to conventional composites when restoring class II. MOD cavities in molar teeth with different layering techniques. Methods One hundred and thirty mandibular third molars were divided into 5 groups (n = 26). Except for the control group (intact teeth), in all other groups MOD cavities were prepared. The cavities were restored by either conventional composite with horizontal and oblique layering or by SFRC with horizontal and oblique layering. The specimens were submitted to static fracture toughness test. Fracture thresholds and fracture patterns were evaluated. Results In general, no statistically significant difference was found in fracture toughness between the study groups, except for horizontally layered conventional composite restorations, which turned out to be significantly weaker than controls. However, SFRC yielded noticeably higher fracture thresholds and only obliquely applied SFRC restorations exhibited favourable fracture patterns above chance level. Conclusions The application of SFRC did not lead to a statistically significant improvement of the fracture toughness of molar teeth with MOD cavities. Still, SFRC applied in oblique increments measurably reduces the chance of unrestorable fractures of molar teeth with class II MOD cavities. Clinical significance The restoration of severely weakened molar teeth with the use of SFRC combined with composite might have advantages over conventional composites alone. It was observed from the statistical data, that the application of SFRC with an oblique layering technique yielded not significantly but better fracture thresholds and more favourable fracture patterns than any other studied material/technique combination. Thus further investigations need to be carried out, to investigate the possible positive mechanical effects of SFRC. The application of the horizontal layering technique with conventional composite materials is inferior to the oblique technique and SFRC materials.

Original languageEnglish
Pages (from-to)1143-1150
Number of pages8
JournalJournal of Dentistry
Volume42
Issue number9
DOIs
Publication statusPublished - 2014

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Tooth
Tooth Fractures
Third Molar
Control Groups
In Vitro Techniques

Keywords

  • Biomechanical stability
  • Conventional composite
  • Fracture resistance
  • Short fibre reinforced composite

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

In vitro fracture resistance of molar teeth restored with a short fibre-reinforced composite material. / Fráter, Márk; Forster, András; Keresztúri, Márk; Braunitzer, Gábor; Nagy, K.

In: Journal of Dentistry, Vol. 42, No. 9, 2014, p. 1143-1150.

Research output: Contribution to journalArticle

Fráter, Márk ; Forster, András ; Keresztúri, Márk ; Braunitzer, Gábor ; Nagy, K. / In vitro fracture resistance of molar teeth restored with a short fibre-reinforced composite material. In: Journal of Dentistry. 2014 ; Vol. 42, No. 9. pp. 1143-1150.
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AU - Nagy, K.

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N2 - Objectives The purpose of this in vitro study was to evaluate the efficiency of a short fibre-reinforced composite (SFRC) material compared to conventional composites when restoring class II. MOD cavities in molar teeth with different layering techniques. Methods One hundred and thirty mandibular third molars were divided into 5 groups (n = 26). Except for the control group (intact teeth), in all other groups MOD cavities were prepared. The cavities were restored by either conventional composite with horizontal and oblique layering or by SFRC with horizontal and oblique layering. The specimens were submitted to static fracture toughness test. Fracture thresholds and fracture patterns were evaluated. Results In general, no statistically significant difference was found in fracture toughness between the study groups, except for horizontally layered conventional composite restorations, which turned out to be significantly weaker than controls. However, SFRC yielded noticeably higher fracture thresholds and only obliquely applied SFRC restorations exhibited favourable fracture patterns above chance level. Conclusions The application of SFRC did not lead to a statistically significant improvement of the fracture toughness of molar teeth with MOD cavities. Still, SFRC applied in oblique increments measurably reduces the chance of unrestorable fractures of molar teeth with class II MOD cavities. Clinical significance The restoration of severely weakened molar teeth with the use of SFRC combined with composite might have advantages over conventional composites alone. It was observed from the statistical data, that the application of SFRC with an oblique layering technique yielded not significantly but better fracture thresholds and more favourable fracture patterns than any other studied material/technique combination. Thus further investigations need to be carried out, to investigate the possible positive mechanical effects of SFRC. The application of the horizontal layering technique with conventional composite materials is inferior to the oblique technique and SFRC materials.

AB - Objectives The purpose of this in vitro study was to evaluate the efficiency of a short fibre-reinforced composite (SFRC) material compared to conventional composites when restoring class II. MOD cavities in molar teeth with different layering techniques. Methods One hundred and thirty mandibular third molars were divided into 5 groups (n = 26). Except for the control group (intact teeth), in all other groups MOD cavities were prepared. The cavities were restored by either conventional composite with horizontal and oblique layering or by SFRC with horizontal and oblique layering. The specimens were submitted to static fracture toughness test. Fracture thresholds and fracture patterns were evaluated. Results In general, no statistically significant difference was found in fracture toughness between the study groups, except for horizontally layered conventional composite restorations, which turned out to be significantly weaker than controls. However, SFRC yielded noticeably higher fracture thresholds and only obliquely applied SFRC restorations exhibited favourable fracture patterns above chance level. Conclusions The application of SFRC did not lead to a statistically significant improvement of the fracture toughness of molar teeth with MOD cavities. Still, SFRC applied in oblique increments measurably reduces the chance of unrestorable fractures of molar teeth with class II MOD cavities. Clinical significance The restoration of severely weakened molar teeth with the use of SFRC combined with composite might have advantages over conventional composites alone. It was observed from the statistical data, that the application of SFRC with an oblique layering technique yielded not significantly but better fracture thresholds and more favourable fracture patterns than any other studied material/technique combination. Thus further investigations need to be carried out, to investigate the possible positive mechanical effects of SFRC. The application of the horizontal layering technique with conventional composite materials is inferior to the oblique technique and SFRC materials.

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KW - Fracture resistance

KW - Short fibre reinforced composite

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