Oral streptococci growth on aging and non-aging esthetic restorations after radiotherapy.
The aim of this study was to examine Streptococcus mutans biofilm growth on both aged and non-aged restorative dental resins, which were submitted to therapeutic irradiation. Sixty-four disks of an esthetic restorative material (Filtek Supreme) were divided into 2 groups: aged group (AG) and a non-aged group (NAG). Each group was subdivided into 4 subgroups: non-irradiated and irradiated with 10Gy, 35Gy, and 70Gy. The biofilms were produced by Streptococcus mutans UA159 growing on both AG and NAG surfaces. The colony-forming units per mL (CFU/mL) were evaluated by the ANOVA and the Tukey LSD tests (α=0.05). AG presented smaller amounts of CFU/mL than the NAG before irradiation and after 10Gy of irradiation (p<0.05). AG irradiated with 35 and 70Gy showed increased amount of bacterial biofilm when compared to non-irradiated and 10Gy-irradiated disks (p<0.05). The exposure to ionizing radiation at therapeutic doses promoted changes in bacterial adherence of aged dental restorative material.
Department of Oral Diagnosis, Area of Dental Radiology, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil.
Adriana D da
AD
Cruz
Karina
K
Cogo
Cristiane de C
Cde C
Bergamaschi
Frab N
FN
Bóscolo
Francisco C
FC
Groppo
Solange M de
SM
Almeida
D000704:Analysis of Variance; D001422:Bacterial Adhesion / Q000528:radiation effects*; D018441:Biofilms / Q000528:radiation effects; D003188:Composite Resins / Q000528:radiation effects*; D003764:Dental Materials / Q000528:radiation effects; D044622:Dental Pellicle / Q000382:microbiology / Q000528:radiation effects*; D003793:Dental Restoration, Permanent / Q000379:methods; D004307:Dose-Response Relationship, Radiation; D055115:Light-Curing of Dental Adhesives; D011878:Radiotherapy; D018709:Statistics, Nonparametric; D013295:Streptococcus mutans / Q000528:radiation effects*; D013997:Time Factors
D003188:Composite Resins; D003764:Dental Materials; C474035:Filtek Supreme