Dr Ghazy

by Mohamed
(Mansoura, Egypt)

Original Text: Dr Ghazy


Objective: A treatment modality using a cantilever resin bonded In-Ceram zirconia could be an alternative for single anterior tooth replacement. So that the effect of thermal cycling and mechanical loading (TCML) on the fracture strength of both metal-ceramic and all-ceramic cantilever resin bonded fixed dental prostheses (CRBFPDRBFDPs) as well as the fracture pattern were evaluated. Materials and methods: A total of 40 CRBFPDRBFDPs were fabricated either from base metal alloys or glass-infiltrated zirconia reinforced aluminum oxide ceramic. The restorations were cemented to their corresponding teeth using adhesive resin cement (Panavia F.2, Kurarary, Japan). Half of the specimens were subjected to TCML (n=10).the failure load and the type of fracture pattern were evaluated by applying load 45degrees 3mm from the incisal edge of the pontics. Results: TCML had a significant influence in the failure load of the tested prostheses (P= 0.0001). There were high significant differences in fracture pattern between metal-ceramic and all-ceramic CRBFDPS with metal-ceramic restorations showing the highest values Conclusions: All tested restorations have the potential to withstand occlusal forces applied in anterior regions; TCML has a negative effect on the fracture strength of the tested cantilever RBFDPs.

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Revised Text:

Objective:

A treatment modality using a cantilever resin bonded In-Ceram zirconia could be an alternative for single anterior tooth replacement. The effects of thermal cycling and mechanical loading (TCML) on the fracture strength of both metal-ceramic and all-ceramic cantilever resin bonded fixed dental prostheses (CRBFPDRBFDPs), as well as the fracture pattern, were evaluated.

Materials and methods:

A total of 40 CRBFPDRBFDPs were fabricated, either from base metal alloys or glass-infiltrated zirconia reinforced aluminum oxide ceramic. The restorations were cemented to their corresponding teeth using adhesive resin cement (Panavia F.2, Kurarary, Japan). Half of the specimens were subjected to TCML (n=10). The failure load and the type of fracture pattern were evaluated by applying a load at 45 degrees, 3mm from the incisal edge of the pontics.

Results:

TCML had a significant influence in the failure load of the tested prostheses (P= 0.0001). There were high significant differences in fracture patterns between metal-ceramic and all-ceramic CRBFDPS, with metal-ceramic restorations showing the highest values.

Conclusions:

1. All tested restorations have the potential to withstand occlusal forces applied in anterior regions.

2. TCML has a negative effect on the fracture strength of the tested cantilever RBFDPs.

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