RESUMO
Statement of the Problem: There are some concerns regarding the effect of Chlorhexidine [CHX] applied for cavity disinfection on the bond strength of adhesive restorations to dentin
Purpose: This study sought to assess the effect of CHX on the shear strength [SBS] of Equia resin-modified glass ionomer cement [RMGIC] to dentin in permanent teeth
Materials and Method: In this experimental study, the buccal surface of 84 freshly extracted human premolars was ground to expose the flat dentin. The samples were randomly assigned to four groups [n=21]. The steps were as following in the group I[a]: conditioning, Equia RMGIC, 500 thermal cycles; group Ib: conditioning, Equia RMGIC, 6000 thermal cycles; group II[a]: conditioning, CHX, Equia RMGIC, 500 thermal cycles, and group II[b]: conditioning, CHX, Equia RMGIC, and 6000 thermal cycles. Twenty samples from each group were subjected to SBS test and one sample was inspected under a scanning electron microscope. Data were analyzed using two-way ANOVA and t-test
Results: The SBS was significantly different among the groups [p= 0.007]. The groups subjected to 500 thermal cycles showed significantly higher SBS to dentin when they were treated with CHX [p= 0.000]. There was no significant difference between samples thermocycled for 6000 cycles with and without application of CHX [p= 0.269]
The SBS in the groups that were thermocycled for 6000 cycles [I[b] and II[b]] was lower than those thermocycled for 500 cycles [I[a] and II[a]]. This difference between II[a] and lib was statistically significant [p= 0.007]
Conclusion: Chlorhexidine can positively affect the short term SBS of Equia RMGIC to dentin
Assuntos
Desinfetantes , Desinfecção , Resistência ao Cisalhamento , Cimentos de Ionômeros de Vidro , Dentição PermanenteRESUMO
One of the most significant problems in pediatric dentistry is behavioral resistance of preschool children in the first visit. There is a debate on parental presence in operation room. The purpose of this study was to evaluate the Iranian 5-year-old children's behavior including anxiety and cooperation relative to parental presence in the first and second dental appointments. The study was conducted on sixty seven 5-year-old children selected according to inclusion criteria and randomly divided into two subgroups. Children in group I were visited in parent's presence and in group II in parent's absence. Before the child's first dental visit, parents were interviewed. Forty eight of the children receiving the initial examination were recalled for a second visit. The children's responses during the Holst procedure of the first visit and restorative second visit were assessed using a combination of two measures including heart rate and clinical behavior. The dentist-patient interactions were regulated by standardized scripts and recorded on videotape. Then, the behavior of the child on the recording during each visit was quantified by two pediatric dentists independently according to Venham 6-point rating scale and Frankle 4-point rating scale. There were no significant differences between the heart rate measures of children in group I and II in the first and second visit [0.67, 0.8 respectively]. There were also no significant differences between the clinical anxiety scores of children in the two groups in the first and second visit [0.98, 0.42 respectively]. Moreover, there were no significant differences between the clinical cooperation scores of children in group I and group II in the first and second visit [0.88, 0.40 respectively], neither were there any significant differences between response measures of each child between two visits [P>0.05]. In addition, there were no significant differences related to sex, parental education and dental experiences [P>0.05]. Parental presence or absence doesn't affect an Iranian 5-year-old child's anxiety on the first and second dental visit, as well as an Iranian 5-year-old child's cooperation on the first and second dental visit