Your browser doesn't support javascript.
loading
Cyclic mechanical loading promotes bacterial penetration along composite restoration marginal gaps.
Khvostenko, D; Salehi, S; Naleway, S E; Hilton, T J; Ferracane, J L; Mitchell, J C; Kruzic, J J.
Afiliação
  • Khvostenko D; Materials Science, School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University, Corvallis, OR, USA.
  • Salehi S; Department of Restorative Dentistry, School of Dentistry, Oregon Health & Science University, Portland, OR, USA.
  • Naleway SE; Materials Science, School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University, Corvallis, OR, USA.
  • Hilton TJ; Department of Restorative Dentistry, School of Dentistry, Oregon Health & Science University, Portland, OR, USA.
  • Ferracane JL; Department of Restorative Dentistry, School of Dentistry, Oregon Health & Science University, Portland, OR, USA.
  • Mitchell JC; College of Dental Medicine, Midwestern University, Glendale, AZ, USA.
  • Kruzic JJ; Materials Science, School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University, Corvallis, OR, USA. Electronic address: jamie.kruzic@oregonstate.edu.
Dent Mater ; 31(6): 702-10, 2015 Jun.
Article em En | MEDLINE | ID: mdl-25900624
ABSTRACT

OBJECTIVES:

Secondary caries is the most common reason for composite restoration replacement and usually forms between dentin and the filling. The objective of this study was to investigate the combined effect of cyclic loading and bacterial exposure on bacterial penetration into gaps at the interface between dentin and resin composite restorative material using a novel bioreactor system and test specimen design.

METHODS:

Human molars were machined into 3mm thick disks with 2mm deep × 5 mm diameter cavity preparations into which composite restorations were placed. A ∼ 15-30 µm (small) or ∼ 300 µm wide (large) marginal gap was introduced along half of the interface between the dentin and restoration. Streptococcus mutans UA 159 biofilms were grown on each sample prior to testing each in a bioreactor both with and without cyclic loading. Both groups of samples were tested for 2 weeks and post-test biofilm viability was confirmed with a live-dead assay. Samples were fixed, mounted and cross-sectioned to reveal the gaps and observe the depth of bacterial penetration.

RESULTS:

It was shown that for large gap samples the bacteria easily penetrated to the full depth of the gap independent of loading or non-loading conditions. The results for all cyclically loaded small gap samples show a consistently deep bacterial penetration down 100% of the gap while the average penetration depth was only 67% for the non-loaded samples with only two of six samples reaching 100%.

SIGNIFICANCE:

A new bioreactor was developed that allows combining cyclic mechanical loading and bacterial exposure of restored teeth for bacterial biofilm and demineralization studies. Cyclic loading was shown to aid bacterial penetration into narrow marginal gaps, which could ultimately promote secondary caries formation.
Assuntos
Palavras-chave

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Adaptação Marginal Dentária / Biofilmes / Reatores Biológicos / Cárie Dentária / Infiltração Dentária / Restauração Dentária Permanente Limite: Humans Idioma: En Ano de publicação: 2015 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Adaptação Marginal Dentária / Biofilmes / Reatores Biológicos / Cárie Dentária / Infiltração Dentária / Restauração Dentária Permanente Limite: Humans Idioma: En Ano de publicação: 2015 Tipo de documento: Article