Cervical Margin Integrity of Class II Resin Composite Restorations in Laser- and Bur-Prepared Cavities Using Three Different Adhesive Systems

Oskoee, PA; Kimyai, Soodabeh; Ebrahimi, Me; Rikhtegaran, Sahand; Azar, Fatemeh Pournaghi

doi:10.2341/10-403-l

Cited by 17 publications

(13 citation statements)

References 24 publications

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“…27 In cases in which there is inadequate bonding to tooth structures, forces resulting from polymerization shrinkage might give rise to gap formation at cavity wall‒restorative material interface. 28 Composite resin marginal integrity might be affected by various factors, including the cavity size, the angle at which enamel prisms and dentinal tubules are cut based on their location, the procedure in which dental hard tissues are conditioned, the layering protocol and the polymerization technique used, etc.…”

Section: Discussionmentioning

confidence: 99%

Factors affecting marginal integrity of class II bulk-fill composite resin restorations

Oskoee

Bahari

Navimipour

et al. 2017

J Dent Res Dent Clin Dent Prospects

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Background. Bulk-fill composite resins are a new type of resin-based composite resins, claimed to have the capacity to be placed in thick layers, up to 4 mm. This study was carried out to evaluate factors affecting gap formation in Cl II cavities restored using the bulk-fill technique. Methods. A total of 60 third molars were used in this study. Two Cl II cavities were prepared in each tooth, one on the mesial aspect 1 mm coronal to the CEJ and one on the distal aspect 1 mm apical to the CEJ. The teeth were divided into 4 groups: A: The cavities were restored using the bulk-fill technique with Filtek P90 composite resin and its adhesive system and light-cured with quartz tungsten halogen (QTH) light-curing unit. B: The cavities were restored similar to that in group A but light-cured with an LED light-curing unit. C: The cavities were restored using the bulk-fill technique with X-tra Fil composite resin and Clearfil SE Bond adhesive system and light-cured with a QTH curing unit. D: The cavities were restored similar to that in group C but light-cured with an LED light-curing unit. The gaps were examined under a stereomicroscope at ×60. Data were analyzed with General Linear Model test. In cases of statistical significance (P<0.05), post hoc Bonferroni test was used for further analyses. Results. The light-curing unit type had no effect on gap formation. However, the results were significant in relation to the composite resin type and margin location (P<0.001). The cumulative effects of light-curing unit*gingival margin and light-curing unit*composite resin type were not significant; however, the cumulative effect of composite rein type*gingival margin was significant (P=0.04) Conclusion. X-tra Fil composite exhibited smaller gaps compared with Filtek P90 composite with both light-curing units. Both composite resins exhibited smaller gaps at enamel margins.

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Section: Discussionmentioning

confidence: 99%

Factors affecting marginal integrity of class II bulk-fill composite resin restorations

Oskoee

Bahari

Navimipour

et al. 2017

J Dent Res Dent Clin Dent Prospects

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“…Gingival margin gaps were measured using a stereomicroscope (SMZ 1500; Nikon, Tokyo, Japan) at ×40 magnification. 24,29 A digital camera was used to photograph the selected areas with the use of a DS-L2 control unit (Nikon, Tokyo, Japan) so that the gaps could be measured. 24,29 The gap widths were measured with the built-in software in µm by determining two points on each side of the gap (one on the restoration side and one on the root side) and measuring the distance between these two points.…”

Section: Methodsmentioning

confidence: 99%

“…24,29 A digital camera was used to photograph the selected areas with the use of a DS-L2 control unit (Nikon, Tokyo, Japan) so that the gaps could be measured. 24,29 The gap widths were measured with the built-in software in µm by determining two points on each side of the gap (one on the restoration side and one on the root side) and measuring the distance between these two points. The width of the marginal gap was measured at three points (external, middle and internal) and their means were determined as the width of the marginal gap (Figure 1).…”

Section: Methodsmentioning

confidence: 99%

The effect of repeated preheating of dimethacrylate and silorane-based composite resins on marginal gap of class V restorations

P¹,

F²,

Navimipour³

et al. 2017

J Dent Res Dent Clin Dent Prospects

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Background. One of the problems with composite resin restorations is gap formation at resin‒tooth interface. The present study evaluated the effect of preheating cycles of silorane- and dimethacrylate-based composite resins on gap formation at the gingival margins of Class V restorations.Methods. In this in vitro study, standard Class V cavities were prepared on the buccal surfaces of 48 bovine incisors. For restorative procedure, the samples were randomly divided into 2 groups based on the type of composite resin (group 1: di-methacrylate composite [Filtek Z250]; group 2: silorane composite [Filtek P90]) and each group was randomly divided into 2 subgroups based on the composite temperature (A: room temperature; B: after 40 preheating cycles up to 55°C). Marginal gaps were measured using a stereomicroscope at ×40 and analyzed with two-way ANOVA. Inter- and intra-group comparisons were analyzed with post-hoc Tukey tests. Significance level was defined at P < 0.05.Results. The maximum and minimum gaps were detected in groups 1-A and 2-B, respectively. The effects of composite resin type, preheating and interactive effect of these variables on gap formation were significant (P<0.001). Post-hoc Tukey tests showed greater gap in dimethacrylate compared to silorane composite resins (P< 0.001). In each group, gap values were greater in composite resins at room temperature compared to composite resins after 40 preheating cycles (P<0.001).Conclusion. Gap formation at the gingival margins of Class V cavities decreased due to preheating of both composite re-sins. Preheating of silorane-based composites can result in the best marginal adaptation.

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“…In order to mimic the conditions prevailing in oral cavity, the tooth samples underwent a thermocycling procedure at 5±2/55±2ºC, consisting of 500 rounds with a dwell time of 30 seconds and a transfer time of 10 seconds. Finally, the samples were sectioned in a buccolingual direction at the middle of the restorations, with a diamond disk (Diamont Gmbh, D&Z, Berlin, Germany), followed by measuring the gingival marginal gaps at ×40 under a stereomicroscope (Nikon, Tokyo, Japan) (22). Selected areas underwent digital photography with a DS-L2 control unit (Nikon, Tokyo, Japan) so that the gap sizes could be determined.…”

Section: Methodsmentioning

confidence: 99%

Effect of hemostatic agent on marginal gaps of class V giomer restorations

et al. 2017

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BackgroundContamination of dentin with hemostatic agents might exert a deleterious effect on adhesive procedures on dentin. The present study was undertaken to investigate the effect of aluminum chloride hemostatic agent on marginal gaps in Cl V giomer restorations.Material and MethodsFifty sound bovine permanent incisors were selected for the purpose of this in vitro study and Cl V cavities were prepared on their buccal surfaces; the gingival margins of the cavities were placed in dentin. The tooth samples were randomly assigned to two groups (n=25). The samples in groups 1 and 2 underwent a restorative procedure without and with the application of aluminum chloride hemostatic agent in the cavity, respectively, before application of the adhesive. BeautiBond one-step self-etch adhesive and Beautifil II giomer restorative material were used for the restoration of the cavities in both groups. The samples were thermocycled and sectioned, followed by measuring the gap sizes at gingival margins in µm under a stereomicroscope. The marginal gaps were compared with Mann-Whitney U test. Statistical significance was set at P<0.05. ResultsThe results showed significant differences in the mean marginal gaps between the two groups under study (P<0.001); the mean marginal gaps were higher in group 2 (with hemostatic agent) compared to those in group 1 (without hemostatic agent) (P<0.0005).ConclusionsContamination with aluminum chloride hemostatic agent in giomer restorations gave rise to higher gingival margin gaps. Key words:Dental adhesives, giomer restorative material, hemostatic agent, marginal adaptation.

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Cervical Margin Integrity of Class II Resin Composite Restorations in Laser- and Bur-Prepared Cavities Using Three Different Adhesive Systems

Cited by 17 publications

References 24 publications

Factors affecting marginal integrity of class II bulk-fill composite resin restorations

Factors affecting marginal integrity of class II bulk-fill composite resin restorations

The effect of repeated preheating of dimethacrylate and silorane-based composite resins on marginal gap of class V restorations

Effect of hemostatic agent on marginal gaps of class V giomer restorations

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