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.
Cruz
Adriana D da
AD
Department of Oral Diagnosis, Area of Dental Radiology, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil.
Cogo
Karina
K
Bergamaschi
Cristiane de C
Cde C
Bóscolo
Frab N
FN
Groppo
Francisco C
FC
Almeida
Solange M de
SM
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