Two years survival rate of class II composite resin restorations prepared by ART with and without a chemomechanical caries removal gel in primary molars

The aim was to test the null hypotheses that there is no difference: (1) in carious lesion development at the restoration margin between class II composite resin restorations in primary molars produced through the atraumatic restorative treatment (ART) with and without a chemomechanical caries removal gel and (2) in the survival rate of class II composite resin restorations between two treatment groups after 2 years. Three hundred twenty-seven children with 568 class II cavitated lesions were included in a parallel mouth study design. Four operators placed resin composite (Filtek Z 250) restorations bonded with a self-etch adhesive (Adper prompt L pop). Two independent examiners evaluated the restorations after 0.5, 1, and 2 years using the modified Ryge criteria. The Kaplan–Meier survival method was applied to estimate survival percentages. A high proportion of restorations were lost during the study period. Therefore, the first hypothesis could not be tested. No statistically significant difference was observed between the cumulative survival percentages of restorations produced by the two treatment approaches over the 2-year period (ART, 54.1 ± 3.4%; ART with Carisolv™, 46.0 ± 3.4%). This hypothesis was accepted. ART with chemomechanical gel might not provide an added benefit increasing the survival percentages of ART class II composite resin restorations in primary teeth

Effect of nonvital bleaching with 10% carbamide peroxide on sealing ability of resin composite restorations

WOS: 000188050700010PubMed ID: 14718058Aim To (i) determine the effect of nonvital bleaching with 10% carbamide peroxide on the sealing ability of resin composite restorations bonded with a self-etching adhesive system; and (ii) compare the effects of antioxidant treatment and delayed restoration after bleaching on marginal seal. Methodology Forty-eight noncarious maxillary incisors were divided into four groups (n = 12) after conventional root canal treatment was completed. In group 1, access cavities were restored with a self-etching adhesive system and resin composite. In the remaining three groups, 10% carbamide peroxide bleaching gel was placed into the access cavities for periods of 8 h per day for 1 week. They were then restored in the same manner as group 1. Group 2 consisted of specimens restored immediately after bleaching. Group 3 specimens were treated with the antioxidant, 10% sodium ascorbate, whereas group 4 specimens were immersed in artificial saliva for 1 week before restoration. Ten specimens in each group were then subjected to dye leakage; the remaining 2 specimens were examined in a SEM (Jeol/JSM 5200, Tokyo, Japan). The dye penetration was assessed with the standard scoring system. Statistical analysis was carried out using the Kruskal-Wallis and the Mann-Whitney tests. Results Groups 1, 3 and 4 exhibited similar leakage patterns and significantly less leakage than group 2 (P < 0.0083). SEM examination of groups 1, 3 and 4 specimens demonstrated close adaptation of resin composite to cavity walls, whereas group 2 specimens did not. Conclusion Nonvital bleaching with 10% carbamide peroxide adversely affected the immediate sealing ability of resin composite restoration; both 10% sodium ascorbate treatment and a 1-week delay in restoration following bleaching improved the reduced sealing ability of resin composite

The clinical performance of one- and two-step self-etching adhesive systems at one year

WOS: 000229243100025PubMed ID: 15966655Background. The author compared the clinical performance of a two-step self-etching adhesive system and a one-step self-etching adhesive system over one year. Methods. Thirty-five patients with noncarious cervical lesions were enrolled in the study. The author restored 163 lesions using a two-step (Clearfil Protect Bond, Kuraray, Osaka, Japan) or a one-step (Xeno III, Dentsply/DeTrey, Konstanz, Germany) self-etching adhesive system. Enamel margins were not beveled, and no mechanical retentions were placed. The author evaluted the restorations at baseline and at three, six, nine and 12 months after placement using modified Ryge critera for color-matching ability, marginal discoloration, marginal adaptation, initial caries formation, anatomical form, postoperative sensitivity and retention loss. Results. The author assessed the changes in the parameters using the Cochran Q test and the McNemar test at a significance level of .05. At one year, the retention rates for the restorations in the two-step group were 100 percent; they were 96 percent for the restorations in the one-step group. Of the retained 75 restorations from the one-step group, two had marginal discoloration and slight anatomical form problems. In both groups, color-matching ability and postoperative sensitivity remained excellent. Conclusion. The performance of both self-etching adhesive systems was excellent during this one-year clinical trial. However, the two-step system exhibited slightly better retention than the one-step system. Clinical Implications. The one- and two-step self-etching adhesive systems evaluated in this study provided excellent clinical retention in noncarious lesions without mechanical retention

Effect of cavity disinfectants on the sealing ability of nonrinsing dentin-bonding resins

WOS: 000222673900007PubMed ID: 15202592Objectives: The purpose of this study was to determine the effect of three cavity disinfectants (chlorhexidine gluconate-based, Consepsis; benzalkonium chlorite-based, Tubulicid red; iodine-potassium iodide/copper sulphate-based, Ora-5) on the microleakage of nonrinsing dentin-bonding systems, Clearfil SE Bond and Prompt L-Pop. Method and materials: Class V cavity preparations were placed on the buccal and lingual surfaces of extracted molars with occlusal margins at the enamel and gingival margins in cementum. In the experimental groups, cavities were treated with combinations of one of the three cavity disinfectants with either Clearfil SE Bond or Prompt L-Pop. The preparations without disinfectant application were used as the negative controls for each adhesive system, and the cavities in which neither disinfectant nor dentin-bonding resin were applied, served as the positive controls. After the cavity preparations were restored with resin composite, specimens were thermocycled, stained, and sectioned to evaluate dye penetration. The tooth-resin composite interface of the sectioned specimens was examined under scanning electron microscopy. Results: Consepsis and Tubulicid red did not significantly affect the sealing ability of Clearfil SE Bond and Prompt L-Pop. Ora-5 exhibited gap formations at the tooth-resin composite interface and produced significantly higher microleakage when used with these bonding systems. Conclusion: Consepsis and Tubulicid red can be used as cavity disinfectants with Clearfil SE Bond and Prompt L-Pop without affecting their sealing abilities. However, Ora-5 is not an appropriate disinfectant to use with these bonding systems