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In vivo randomized antimicrobial effect of the photodynamic therapy on deciduous carious dentin: microbiological, clinical and radiographic analysis

Grant number: 11/08392-0
Support Opportunities:Regular Research Grants
Duration: August 01, 2011 - January 31, 2014
Field of knowledge:Health Sciences - Dentistry - Dental Clinics
Principal Investigator:Carlos de Paula Eduardo
Grantee:Carlos de Paula Eduardo
Host Institution: Faculdade de Odontologia (FO). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated researchers:Marcia Pinto Alves Mayer


Despite of the decline of the dental caries in Brazil and around the world, this disease is still common mainly in polarized groups affecting children. Thus, this high caries risk group needs great dental attention and also novel treatment techniques which give priority to minimal intervention. Studies about the photodynamic therapy have already demonstrated the susceptibility of cariogenic bacteria to death when used associated with photossensitisers and activated with a light source. Therefore, the aim of this study will be to compare, in vivo, the antimicrobial effect of two photodynamic therapies, associate with dyes, in the deciduous carious dentin. This study will be conducted in patients between 3 and 9 years old, with presence of deep caries lesion in any deciduous molar, without any pain sintomatology compatible with reversible pulpites. The children will be divided in three groups (n = 15). Control (C), PDTLED (photodynamic therapy - LED) and PDTFL (photodynamic therapy - laser). The selected patients will be submitted to initial clinical examination and standardized bitewing radiographs will be taken in each side before the treatment, immediately after, 6 and 12 months after the end of the treatments. They will also be clinically followed up as regards to pain sintomatology throughout the same periods. The number of viable microorganisms, total level of bacteria and the proportion levels of S. mutans, Lactobacilos casei, Fusobacterium nucleatum, Atopobium e Bifidobacterium will be established by quantitative PCR. The number of rRNA gene copies of each bacterial specie/group will be normalized by variance analysis and Tukey test. For the radiographs, a quantitative analysis of the intra-examinator reproducibility assessment will be performed (Cohen's kappa). The subtraction data reproducibility will be analyzed using an intra-class correlation coefficient. The mean control areas of the dentin and of radioluscence of each followed period will be compared by the multiple variance analysis and Tukey test of multiple comparisons. The variation between the radioluscent areas, accordingly to the period, will be compared using the Friedman rank for repeated measures analysis. The significance level for all statistical analysis will be fixed in 5%. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
STEINER-OLIVEIRA, CAROLINA; LONGO, PRISCILA LARCHER; CORREA ARANHA, ANA CECILIA; RAMALHO, KAREN MUELLER; ALVES MAYER, MARCIA PINTO; EDUARDO, CARLOS DE PAULA. Randomized in vivo evaluation of photodynamic antimicrobial chemotherapy on deciduous carious dentin. Journal of Biomedical Optics, v. 20, n. 10, . (11/08392-0, 10/07212-5)

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