Comparison of three different preparation methods in the improvement of sealant retention.
ABSTRACT The purpose of this in vitro study was to evaluate the effect of three invasive fissure preparation methods in the retention of sealant on the surfaces of permanent molars. One hundred and eight extracted caries-free human molars were used in this study, which were divided into 3 groups according to the fissure preparation: laser, air abrasion and bur. In addition, each of these three groups was further divided into 2 additional groups to isolate those in which a bonding agent would be used from those in which a bonding agent would not be used. After the accomplishment of the different treatments samples from all the 6 experimental groups were submitted to two different bond strength tests: (i) shear bond strength test and (ii) tensile bond strength test. Bond strengths were determined by the dividing fracture load and a statistical test ANOVA was used to evaluate significant differences. The results showed that laser improved the sealant retention when compared with air abrasion preparation when the bonding agent was used. The use of bonding agent increased the sealant retention in all methods except for tensile bond strength when air abrasion was used as the preparation method
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ABSTRACT: This clinical study compared the retention rates of a nanofilled occlusal fissure sealant placed with the use of an etch-and-rinse or a self-etch adhesive over 24 months. Two-hundred and forty-four sealants were placed on the permanent premolars and molars of 16 subjects who had no restorations or sealants present on the fissures and no detectable caries. The sealants were placed with either SoloBond M two-step etch-and-rinse adhesive or FuturaBond NR one-step self-etch adhesive by four previously calibrated dentists, using a table of random numbers. After completion of the adhesive application, a nanofilled sealant, Grandio Seal, was applied and light-cured. Clinical evaluations were done at baseline and at 1-, 3-, 6-, 12-, 18- and 24-month recalls. Two other calibrated examiners, who were unaware of which adhesive had been used, independently evaluated the sealants. Evaluation of the sealants on every follow-up visit involved visual examination with the aid of a dental explorer and an intra-oral mirror. Each sealant was evaluated with the following criteria: 1 = completely retained; 2 = partial loss; 3 = total loss. The Pearson Chi-square test was used to evaluate differences in the retention rates among the sealants used with different adhesives for each evaluation period. For the 12-month recalls, complete retention rates of 89.3% for the SoloBond M group and 20.5% for the FuturaBond NR group were observed. Sixteen of the 244 restorations were unavailable after 12 months. At 24 months, a total loss of 9 sealants in the SoloBond M group and 84 in the FuturaBond NR group were observed, resulting in retention rates of 81.6% and 15.8%, respectively. There were statistically significant differences in retention rates between the SoloBond M and FuturaBond NR groups in all periods of evaluation (p < 0.05). No statistically significant difference between the retention rates for premolars and molars was found at each evaluation period (p > 0.05). There was no new caries formation throughout the 24-month recall period. Fissure sealants placed with etch-and-rinse adhesive showed better retention rates than those placed with self-etch adhesive.Operative Dentistry 01/2009; 34(6):642-7. · 1.31 Impact Factor
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ABSTRACT: Prevention from caries is a principle in dentistry and fissure sealant therapy is being used as a preventive method success of sealants is directly depending on their retention. The Aim of the present study is to evaluate effects of enamel preparation on sealant retention. Clinical trial. About 57 children aged 6-8 year old took part in this study. 200 first molar teeth of these children has been randomly separated into two groups: A case group (Mechanically preparation of enamel) and a control group (conventional method, without preparation). After applying fissure sealants children were followed up 6 months later. Mann- U- Whitney Test was used. Complete retention after 6 month follow up was 86.7% in case group and 82.8% in control group. No significant difference was seen between the groups after 6 month follow up. (P = 0.508). Although statistical evaluation didn't show significant difference, but sealant retention was more after preparation technique.Contemporary clinical dentistry. 10/2012; 3(4):380-2.
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ABSTRACT: This study evaluated the effect of polymerization mode and time and thermal and mechanical loading cycling (TMC) on microleakage in composite resin restorations. One hundred and eighty cavities were prepared and randomly divided according to the light curing time (20, 40, or 60 s), modes (quartz-tungsten-halogen (QTH)-420 mW/cm(2), LED 2 (2nd degree generation)-1,100 mW/cm(2), or LED 3 (3rd degree generation)-700 mW/cm(2)), and TMC. Following standard restorative procedures, the samples were prepared for analysis in an absorbance spectrophotometer. All results were statistically analyzed using the three-way ANOVA and Tukey test (p ≤ 0.05). The results revealed that the groups QTH and LED 3 submitted to TMC showed higher microleakage than those that were not submitted to TMC. Only for LED 3, 60 s showed higher microleakage than 20 s. For LED 2 and QTH, there were no differences between the times. QTH showed lower microleakage means than LED 2, when photoactivated for 20 s, without TMC. When photoactivated for 60 s, QTH showed lower microleakage means than LED 3, for the groups with or without TMC. It was concluded that TMC, the increase in polymerization time, and the irradiance were factors that may increase the marginal microleakage of class II cavities.Lasers in Medical Science 01/2013; · 2.40 Impact Factor