Microleakage Of Class Research Articles

Evaluation of the microleakage of different class V cavities prepared by using Er:YAG laser, ultrasonic device, and conventional rotary instruments with two dentin bonding systems (an in vitro study)

This study aimed to evaluate the extent of microleakage in class V cavities prepared with bur, Er:YAG laser, and ultrasonic, hybridized with two different bonding agents ("Single bonding" solvent-free bonding agent and "Swiss TEC SL bond" alcohol-based solvent). Thirty freshly extracted human premolars were divided into three groups (n = 10), on each tooth, two cavities were prepared on the buccal and the lingual surfaces, and each group was subdivided into two subgroups (n = 5). Group 1: 20 cavities were prepared by using Er:YAG laser (500 mJ, 10 Hz, 63.69 J/cm(2)) (subgroup1a: Single bonding was used with 10 cavities; subgroup 1b: Swiss TEC SL bond was used with 10 cavities). Group 2: 20 cavities were prepared by using ultrasonic (subgroup 2a: Single bonding was used with 10 cavities; subgroup 2b: Swiss TEC SL bond was used with 10 cavities). Group 3: 20 cavities were prepared by using burs (subgroup 3a: Single bonding was used with 10 cavities; subgroup 3b: Swiss TEC SL bond was used with 10 cavities). Cavities were restored with a micro-hybrid composite resin. After thermocycling, the specimens were immersed in 2 % methylene blue solution for 4 h and then sectioned in the bucco-lingual direction. Dye penetration was scored based upon the extent of the dye using a stereomicroscope. The two-way ANOVA test and paired t-test revealed no statistically significant differences among the methods of preparation (conventional, laser, and ultrasonic). However, statistical differences were found between the adhesives tested: the "Single bonding", which represented the solvent-free bonding agent, had lower microleakage values than "Swiss TEC SL bond", which represented the alcohol-based bonding agent. Based on the results of this study, it can be concluded that the Erbium:Yttrium-Aluminum Garnet (Er:YAG) laser and ultrasonic are as effective as the conventional method for preparing cavities and the extent of microleakage depends on the type of the bonding agents.

Effect of Air Abrasion Preconditioning on Microleakage in Class V Restorations Under Cyclic Loading: An In-vitro Study.

Microleakage in class V Glass Ionomer Cement(GIC) or composite restorations at enamel or cementum margins has been cited as a reason for their failure. Air abrasion has been used to precondition tooth surface for increasing retention of such restorations. This study is done to evaluate the effect of preconditioning with air abrasion on microleakage in class V GIC and composite restorations. Class V cavities were prepared in 40 freshly extracted teeth. They were categorised into following four groups (n=10) depending on cavity preconditioning and restoration. Group I: 10% polyacrylic acid and GI (Ketac molar TM 3M ESPE); Group II: AA and GI; Group III: 35% Phosphoric acid and micro filled composite (MC) (Heliomolar, Ivoclar Vivadent); Group IV: AA and MC. Each group was further divided into subgroups A (no loading) & B (cyclic loading). Microleakage at occlusal and gingival margins was evaluated using methylene blue dye penetration method. Statistical analysis was done using Kruskal-wallis test and Mann-Whitney U test. Microleakage at cementum margins was higher than at enamel margins in all the groups. Preconditioning with AA resulted in increased micro leakage. AA as a preconditioning agent was ineffective in producing superior tooth-restoration bonding.

Effect of Different Base Materials and Techniques on Microleakage in Class II Composite Open Sandwich Restorations: An in vitro Study

ABSTRACT Aims This study was performed to compare microleakage in class II composite restorations with flowable composites and dual cure composite resin as intermediate material and also to evaluate the effect of delayed light polymerization of dual cure composite base on microleakage. Materials and methods Class II box cavities were made with air water spray and divided into four groups. Group 1 was restored without base, group II with flowable composite base, group III with a dual cure composite base which was immediately cured and group IV with 60 seconds delayed cure, dual cure composite base. Remaining cavity was restored with composite resin Specimens were immersed in methylene blue dye after thermocycling and sectioned through mesiodistal center of tooth and observed for leakage pattern. Microleakage was evaluated using dye penetration with methylene blue. Microleakage pattern was observed under a stereomicroscope. Kruskal-Wallis test and Mann-Whitney test were used for statistical analysis. Results Results of the study showed that application of a composite resin base below a class II composite restoration significantly decreased microleakage as compared to restorations without a base. The least and comparable microleakage scores were seen in groups with flowable composite and dual cure composite (delayed cure) as a base, followed by dual cure composite which was immediately cured. How to cite this article Bhanwal U, Nadig RR, Jagdish K, Pai V, Yashwanth. Effect of Different Base Materials and Techniques on Microleakage in Class II Composite Open Sandwich Restorations: An in vitro Study. World J Dent 2014;5(2):87-91.

Comparative Evaluation of Microleakage in Class 2 Cavities Restored with A Nanohybrid Composite Using Three Different Increment Techniques- An in vitro Stereomicroscopic Study

ABSTRACT Context Purpose of the study was to compare the microleakage in class II cavities using Horizontal oblique increment (G1), Centripetal oblique increment (G2) and Oblique increment (G3), techniques Aims To determine ideal incremental placement technique in restoring class II cavity. Methods and Material Class II cavities were prepared in 45 extracted permanent molars. The teeth were restored with nanohybrid composite (Ceram X) and bonding with adhesive systems (Xeno V). Microleakage evaluated after thermocycling of the specimens. Statistical analysis used ANOVA test at the 0.05 level of significance. Results Mean microleakage score of group G1, G2 and G3 was 2.86 ± 1.43, 1.86 ± 1.65 and 2.46 ± 1.50 respectively. Conclusions None of the insertion techniques used in this study was able to prevent microleakage, though the lowest microleakage values were obtained when the centripetal oblique technique was used.

A Comparative Evaluation of Microleakage in Class V Composite Restorations

Aim. To compare and evaluate the microleakage in class V lesions restored with composite resin with and without liner and injectable nanohybrid composite resin. Materials and Methodology. 60 class V cavities were prepared in 30 freshly extracted teeth. After etching and application of bonding agents these cavities were divided into three groups: Group A (n = 20)—restored with composite resin, Group B (n = 20)—flowable composite resin liner + composite resin, and Group C (n = 20)—restored with injectable composite resin. After curing all the specimens were subjected to thermocycling and cyclic loading. Specimens were stained with 0.5% basic fuchsin and evaluated for dye penetration. Results. Results are subjected to Kruskal Wallis and Wilcoxon test. Conclusion. Within the limitations of this study, none of the three materials were free from microleakage. All the three materials showed more microleakage at gingival margins compared to occlusal margins. Among all the groups G-ænial Flo showed the least microleakage at the gingival wall.

Comparative Evaluation of the Effects of Light Intensities and Curing Cycles of QTH, and LED Lights on Microleakage of Class V Composite Restorations.

The purpose of this study was to evaluate the effects of light intensity and curing cycles of QTH and LED lights on the microleakage of Class V composite restorations. Eighty freshly extracted human maxillary premolars were used for this study. Standardized Class V cavities were prepared and they were restored with microhybrid resin composite. According to the curing protocol, the teeth were then divided into 4 groups (n=20): QTH curing (standard and soft start modes), and LED (standard and soft start modes) irradiations. Microleakage was evaluated by immersion of the samples in 50% silver nitrate solution. The samples were then sectioned, evaluated under a stereomicroscope, and scored for microleakage. The results of the present in-vitro study showed mean dye leakage scores of 1.9, 1.2, 1.45 and 0.90 for Group I (QTH-Standard mode), Group II (QTH-Soft Start mode), Group III (LED-Standard mode) and Group IV (LED-Soft Start mode) respectively. It was thus concluded that the soft start polymerization showed a highly significant difference as compared to the standard curing modes of QTH and LED lights, respectively.

Comparative evaluation of microleakage in Class II restorations using open vs. closed centripetal build-up techniques with different lining materials.

Background:Evaluation of microleakage is important for assessing the success of new restorative materials and methods.Aim and Objectives:Comparative evaluation of microleakage in Class II restorations using open vs. closed centripetal build-up techniques with different lining materials.Materials and Methods:Standardized mesi-occlusal (MO) and distoocclusal (DO) Class II tooth preparations were preparedon 53 molars and samples were randomly divided into six experimental groups and one control group for restorations. Group 1: Open-Sandwich technique (OST) with flowable composite at the gingival seat. Group 2: OST with resin-modified glass ionomer cement (RMGIC) at the gingival seat. Group 3: Closed-Sandwich technique (CST) with flowable composite at the pulpal floor and axial wall. Group 4: CST with RMGIC at the pulpal floor and axial wall. Group 5: OST with flowable composite at the pulpal floor, axial wall, and gingival seat. Group 6: OST with RMGIC at the pulpal floor, axial wall, and gingival seat. Group 7: Control — no lining material, centripetal technique only. After restorations and thermocycling, apices were sealed and samples were immersed in 0.5% basic fuchsin dye. Sectioning was followed by stereomicroscopic evaluation.Results:Results were analyzed using Post Hoc Bonferroni test (statistics is not a form of tabulation). Cervical scores of control were more than the exprimental groups (P < 0.05). Less microleakage was observed in CST than OST in all experimental groups (P < 0.05). However, insignificant differences were observed among occlusal scores of different groups (P > 0.05).Conclusion:Class II composite restorations with centripetal build-up alone or when placed with CST reduces the cervical microleakage when compared to OST.

Effect of 38% carbamide peroxide on the microleakage of silorane-based versus methacrylate-based composite restorations.

ObjectivesThis study aimed to assess the effect of 38% carbamide peroxide on the microleakage of class V cavities restored with either a silorane-based composite or two methacrylate-based composites.Materials and MethodsA total of 96 class V cavities were prepared on the buccal surface of extracted human teeth with both enamel and dentin margins and were randomly assigned into three groups of Filtek P90 (3M-ESPE) + P90 system adhesive (3M-ESPE)(group A), Filtek Z250 (3M-ESPE) + Adper Prompt L-Pop (3M-ESPE)(group B) and Filtek Z350XT (3M-ESPE) + Adper Prompt L-Pop (group C). Half of the teeth were randomly underwent bleaching (38% carbamide peroxide, Day White, Discus Dental, applying for 15 min, twice a day for 14 day) while the remaining half (control) were not bleached. Dye penetration was measured following immersion in basic fuchsine. Data were statistically analyzed using Kruskal-Wallis and Mann-Whitney U tests at a level of 0.05.ResultsNo significant differences were found between composites in the control groups in enamel (p = 0.171) or dentin (p = 0.094) margins. After bleaching, microleakage of Z250 (in enamel [p = 0.867] or dentin [p = 0.590] margins) and Z350 (in enamel [p = 0.445] or dentin [p = 0.591] margins) did not change significantly, but the microleakage of P90 significantly increased in both enamel (p = 0.042) and dentin (p = 0.002) margins.ConclusionsNo significant differences were noted between the bleached and control subgroups of two methacrylate-based composites in enamel or dentin margins. Microleakage of silorane-based composite significantly increased after bleaching.

Microleakage of class v cavities restored with flowable composite materials

Introduction. Increasing requirements for durable fillings and marginal integrity have influenced the development of new materials and restorative techniques. Contemporary demands for esthetic restorations have encouraged the development of new composite material ?self-etch flowable composite?. The aim of this study was to test the marginal seal in small Class V cavities after restoration with self etch flowable composite material Vertise Flow and flowable composite Tetric Flow, both polymerised using conventional light-curing technique. Material and Methods. The study was conducted on 40 extracted human teeth (20 intact, 20 carious). Each group included 10 premolars and 10 molars. In all teeth two cavities class V of diameter 3?2?2 mm were prepared (buccal and lingual surface). On the buccal surface the cavities were filled with self etch flowable composite Vertise Flow (Kerr Dental Products), and on the lingual surface with flowable composite Tetric Flow (Ivoclar Vivadent) using appropriate adhesive system. Polymerisation was performed using LED lamp (Ivoclar Vivadent). Microleakage was tested with silver nitrate solution. Using stereoloupe with micrometer scale and six times magnification dye penetration was measured. Results. Mean dye penetration in intact molars restored with Vertise Flow was 3.41 ?m, while in intact molars restored with Tetric Flow it was 4.23 ?m. In intact premolars restored with Vertise Flow, the average dye penetration was 1.14 ?m and in intact premolars restored with Tetric Flow it was 3.90 ?m. Dye penetration in carious molars restored with Vertise Flow and polymerised using conventional polymerization technique was 3.66 ?m, while using Tetric Flow it was 7.94 ?m. In carious premolars restored with Vertise Flow dye penetration was 3.97 ?m, while with Tetric Flow it was 7.12 ?m. The total dye penetration was lower in intact compared to carious teeth. Greater dye penetration was found in molars compared to premolars. Conclusion. Vertise Flow showed better quality of bond with hard dental tissue than Tetric Flow when classical polymerization technique was used.

In vitro evaluation of microleakage in class II composite restoration following amalgam removal

زمینه و هدف : استفاده از ترمیم مناسب در صورت از بین رفتن نسوج دندان ناشی از پوسیدگی و دلایل دیگر ضروری است. امروزه بسیاری از افراد به دلیل نگرانی از زیبایی تقاضای تعویض ترمیم های قدیمی آمالگام با مواد همرنگ دندان را دارند. هدف از این مطالعه ارزیابی میزان ریزنشت کامپوزیت های جایگزین آمالگام در حفرات کلاس 2 دندان پرمولر است. مواد و روش کار: در این مطالعه تجربی، 30 حفره کلاس 2 روی دندانهای پرمولر سالم کشیده شده تراشیده شدند و سپس به طور تصادفی بر اساس چگونگی ترمیم در 3 گروه قرار گرفتند . گروه اول که در آن از کامپوزیت Packable استفاده شد که به عنوان گروه شاهد در نظر گرفته شد. در گروه دوم حفرات تهیه شده ابتدا با آمالگام پر مس ترمیم شدند و پس از 6 ماه نگهداری در نرمال سالین با برداشت ترمیم آمالگام و بدون دست زدن به محدوده عاجی حفره با کامپوزیت ترمیم شدند . در گروه سوم مانند گروه 2 ترمیمهای 6 ماهه آمالگام برداشته شدند و کف جینجیوال حفره به میزان 5/0 میلی متر خشن گردید و سپس با کامپوزیت مجدد ا ترمیم شدند . تست dye extraction جهت همه نمونه های گروه ها انجام شد. اطلاعات با استفاده از تست ANOVA و ( 05/0 Tukey test (α= آنالیز شدند. یافته ها: میزان ریزنشت گروه 1و3 تفاوت معنی داری نداشت و بیشترین میزان جذب رنگ و در نتیجه ریزنشت در گروه 2 مشاهده شد. نتیجه گیری: پس از برداشت آمالگام خشن نمودن دیواره های عاجی حفره به میزان 5/0 میلیمتر باعث بهبود سیل لبه ای ترمیم می گردد. واژه های کلیدی: آمالگام ، کامپوزیت، عاج، محصولات کروژن، Dye extraction ، ریز نشت

Efficacy of Four Lining Materials in Sandwich Technique to Reduce Microleakage in Class II Composite Resin Restorations

The aim of the present study was to evaluate the effect of four different sandwich techniques on gingival microleakage of Class II direct composite resin restorations. Fifty sound human premolars were selected and randomly divided into five groups (n=10). Class II box only cavities were prepared in one of the proximal surfaces of each tooth with a gingival margin located approximately 0.5 mm below the cemento-enamel junction. Group A (control) was restored incrementally with composite resin (Tetric Ceram). Groups B, C, D, and E were restored with the sandwich technique using a compomer (Compoglass F), flowable composite resin (Tetric Flow), self-cure composite resin (Degufill SC), or resin modified glass ionomer (Fuji II LC), respectively. After thermal-load cycling, the specimens were immersed in 0.5% basic fuschin for 24 hours. Dye penetration (10(-1) mm) was detected using a sectioning technique. Data were analyzed with repeated measurements and Duncan test at α=0.05. The least amount of microleakage was detected in the incremental group (1.28 ± 0.98). The sandwich technique using resin modified glass ionomer (7.99 ± 9.57) or compomer (4.36 ± 1.78) resulted in significantly more leakage than did the sandwich technique using flowable (1.50 ± 1.97) or self-cure composite (2.26 ± 1.52). According to the results of this study, none of the four sandwich technique composite resin restorations used in this study could reduce gingival microleakage to a greater degree than the incremental technique.

Influence of flowable composite and restorative technique on microleakage of class II restorations

The aim of the present study was to evaluate the microleakage in class II cavities restored with dental composite by varying the thickness of two flowable composite resins and the restorative technique. A total of 130 cavities were prepared on proximal surfaces of bovine teeth and randomly divided in 13 groups. Twelve experimental groups were performed using flowable composite resin as the liner, and they were divided according to the type of flowable composite resin (Filtek Z350 Flow-Z350F and SureFil SDR Flow-SUR), the thickness of the flowable composite (0.5, 1, or 2mm), and the restorative technique (flowable composite applied at the cavosurface angle or amelodentinal junction) (n=10). A control group was performed without using a flowable composite. Following restorative procedures and thermocycling, the samples were immersed in Methylene Blue for 2h, and prepared for analysis in an absorbance spectrophotometer. All results were statistically analyzed (α=0.05). There was no significant difference between the flowable composites (P>0.05). The restorative techniques influenced microleakage and were flowable composite dependent (P≤0.05). The lower thickness of the flowable composite provided less microleakage (P≤0.05). The use a lower thickness of a flowable composite resin provided less microleakage, suggesting a better sealing tooth-restoration interface.

Application of chlorhexidine, fluoride and artificial saliva during radiotherapy: an in vitro study of microleakage in Class V restorations

The aim of this study was to evaluate the effect on microleakage in Class V restorations of daily applications of artificial saliva, fluoride mouthrinses and chlorhexidine to irradiated bovine teeth. Class V cavities were created in 60 bovine teeth. The teeth were divided randomly into two groups: the first group (n=30) was subjected to radiotherapy until the teeth had received a total accumulated dose of 60Gy; the second group (n=30) was used as a control group. Both groups were divided into three subgroups (n=10): in Group A teeth were submerged in Xeros Dentaid(®) artificial saliva; Group B teeth were submerged in a solution of 1% amine fluoride; Group C teeth were submerged in 0.12% chlorhexidine. All treatments were applied three times a day for six weeks. Afterwards microleakage into the composite restorations was measured using MIP4 image software. It was seen that radiation caused increases in microleakage in composite restorations. Statistically significant differences were found in the artificial saliva group (p=0.013) and the chlorhexidine group (p=0.023). Microleakage in composite restorations was greater among radiated teeth.

Effect of Liners on Microleakage in Class II Composite Restoration

This study was carried out to evaluate the microleakage of Class II cavities restored with various types of lining materials. Four types of composite resins (Esthet-X-Denstply, USA, Filtek (TM) Z350-3M ESPE, USA, Beautifil- Shofu, Japan and Solare P-GC, Japan) were used and the lining were the Fuji IXGP (GC, Japan), the Beautifil flow (Shofu, Japan), the Filtex (TM) Z350 flow (3M ESPE, USA) and the Esthet-X flow (Denstply, USA). All the specimens were thermocycled and immersed in 0.5 basic fuschin dye for 24 h. The microleakage was scored using the ISO microleakage scoring system. The data were entered using SPSS version 12.0 and analyzed using STATA software programme. This study showed that none of the materials used in this study was able to eliminate microleakage. However, it was shown that the glass ionomer cement was better in reducing the incident of microleakage at the cervical margin. Among the flowable composite resin, Filtex (TM) Z350 flow showed less microleakage at the cervical margin.

DİŞ ETİ RENGİNDEKİ KOMPOZİT REÇİNELERİN SINIF V KAVİTELERDEKİ MİKROSIZINTISININ İNCELENMESİ-Microleakage of Gum-Colored Resin Composites in Class V Cavities

Purpose: To compare the microleakage in class V cavities restored with different gum-colored resin composites.Material and Methods: Class V cavities were prepared on buccal and lingual surfaces of thirty human maxillary premolars. Clearfil SE Bond was used as an adhesive system. In the control group, cavities were restored with Filtek Ultimate. In the test groups, cavities were restored with Filtek Ultimate in combination with either PermaFlo Pink or Gradia Gum Shades, so as to evaluate the microleakage at the junction line, at the gingival and occlusal margins. Teeth were finished, thermocycled and evaluated for leakage. Dye penetration was evaluated with a stereomicroscope at x20 magnification. Data were analyzed statistically using Kruskal Wallis, Mann Whitney-U and Wilcoxon tests.Results: No statistically significant differences were determined between the microleakage values of the control and test groups (p>0.05). Conclusion: Both gum-colored resin composites demonstrated similar performance regarding marginal microleakage.

Influence of Fiber Inserts, Type of Composite, and Gingival Margin Location on the Microleakage in Class II Resin Composite Restorations

This study evaluated the influence of fiber inserts, type of composites, and location of the gingival seat on microleakage in Class II resin composite restorations. Fifty noncarious human third molars were selected for the study. Standardized Class II box type cavities were prepared on the mesial and distal side of 45 teeth. The gingival margin was placed above the cementoenamel junction (CEJ) on the mesial side and below the CEJ on the distal side. The remaining five teeth received no cavity preparations. The prepared samples were divided randomly on the basis of type of composite and presence or absence of fiber inserts, into four experimental groups of 10 teeth each and two control groups of five teeth each. The groups were defined as follows: group I (n=10) - Z350 XT; group II (n=10) - Z350 XT with fibers; group III (n=10) - P90; group IV (n=10) - P90 with fibers; and group V (n=5) - positive controls, cavities were not restored; group VI (n=5) - negative controls, no cavities were prepared. The samples were stored in distilled water in incubator at 37°C for 24 hours and then subjected to 500 cycles of thermocycling (5°C and 55°C) with a dwell time of 15 seconds. They were then placed in a 2% methylene blue dye solution for 24 hours at 37°C. Samples were sectioned longitudinally and evaluated for microleakage at the occlusal and gingival margin under a stereomicroscope at 20× magnification. Kruskal-Wallis and Mann-Whitney U-tests were used to compare the mean leakage scores. Restorations with gingival margins in enamel showed significantly less microleakage. Significant reduction in microleakage was observed in groups restored with P90 composite than those restored with Z350 XT. No improvement in microleakage was observed with the use of fiber inserts (p>0.05).

Study the effect of surface sealant on microleakage in class V cavities filled by different restorative materials

The aim of this study was to evaluate the effect of unfilled resin sealant coating on marginal leakage in decreasing microleakage in class v cavities using PROMEDICA light cure Nano-ceramic composite and nono glass ionomer filling material (EQUIA system). Twenty extracted sound human upper premolars has been selected, Standardized class v cavity with butt-joint marginal configuration were prepared in the middle third of the buccal and palatal surfaces of the tooth. The teeth were randomly divided into four groups of five teeth. Cavities of group 1 were restored with nano composite only , group 2 were restored with nano composite coated with unfilled resin sealant,group3 were restored with light curing nano glass ionomer filing only, and group4 were restored with light curing nonoglass ionomer filing . After rinsing and drying one thin coat of unfilled resin sealant was applied and were light polymerized for 15 seconds. The procedures for dye penetration using Methylene Blue dye were followed and examined under stereomicroscope for evaluation. The data collected were analyzed statistically using paired t test. Nanocomposite recorded less microleakage than nanoglass ionomer cement at occlusal and cervical margins. Results showed that restorations were coated with resin sealant showed significantly less dye penetration in comparison with uncoated surfaces. For nanocomposite filling material p value= 0.002 while for nano glass ionomer filling material p value=0.0047. Though the coating of unfilled resin sealant did not completely eliminated microleakage, unfilled resin sealant was effective in reducing microleakage of the esthetic restorations in class V restorations.

Microleakage of different provisionalization techniques for class I inlays

Background/purposeTo investigate the effects of different provisionalization methods on the microleakage of class I inlay cavities. Materials and methodsClass I inlay cavities were prepared on human molars (n = 60). Teeth were divided into six groups (n = 10). In the first group (ST-C), Structur 2SC (ST) was used with a provisional luting agent, and in the second group (SY-C), Systemp Inlay (SY) was directly applied and light-polymerized. In the remaining four groups, cavities in the third (SB-ST) and fourth (OS-ST) groups were, respectively, pretreated with the bonding agents, Single Bond (SB) and One Step Plus (OS), and the fifth (SB-SY) and sixth (OS-SY) groups were pretreated with the same bonding agents. The third and fourth groups were then restored with ST and the fifth and sixth groups with SY. The teeth were subjected to thermal cycling and immersed in a 0.5% basic fuchsin solution for 24 hours. Specimens were sectioned and examined for leakage. Data were analyzed using the Kruskal–Wallis and Mann–Whitney U tests (P < 0.01). The interface between the provisional material and dentin was observed using a scanning electron microscope (SEM). ResultsGroups treated with a bonding agent (SB-SY and OS-SY) before placement of the light-polymerized provisional material had significantly less microleakage (P < 0.01). No statistical differences were found between leakage scores of the remaining groups. The OS-SY group displayed the best cavity wall-inlay adaptation under SEM. ConclusionThe microleakage in class I inlay cavities could be reduced by the application of dentin-bonding agents after cavity preparation followed by the placement of light-polymerized provisional restorative materials.

The effect of LED curing mode on microleakage of Class V cavity restored by silorane-based composite

Objective. This in vitro study evaluated the effect of soft-start curing mode by LED unit on the marginal microleakage of silorane composite restoration. Materials and methods. Class V cavities were prepared on the buccal surfaces of 80 extracted molars at the cementoenamel junction and randomly divided into eight groups. In groups 1–4, four adhesive/composite combinations (silorane/silorane, silorane/Z250, Adper Single Bond/Z250, Clearfil SE Bond/Clearfil AP-X) were applied and the composites were cured under standard mode at 1500 mW/cm2 for 20 s. In the other four groups, after applying the same adhesive/composite combinations, the composites were cured at 550 mW/cm2 for 10 s followed at 1500 mW/cm2 for 15 s. After 24 h of water storage and thermocycling, the specimens were placed in 1% methylene blue solution. The dye penetration was assessed under a stereomicroscope. The data were analysed using non-parametric tests. Results. There were no significant differences among four groups for two curing modes at the occlusal and gingival margins (p > 0.05). The soft-start curing had a positive effect on the gingival marginal sealing of group 1 (p < 0.05), but not for the other three groups (p > 0.05). Conclusion. The beneficial effect of relatively high soft-start curing on marginal sealing of Class V restoration depends on a combination of the adhesive and composite types, having a positive effect on silorane adhesive/silorane-based composite at the gingival margin.

The Effect of Flowable Composite Lining Thickness with Various Curing Techniques on Microleakage in Class II Composite Restorations: An in vitro Study

Aim of this study was to compare class II composite restoration using flowable composites as lining with various thickness and curing techniques by evaluating cervical marginal microleakage. Fifty intact molars, each prepared with two box-only class II cavities, were randomly divided into five groups: Group I, P60 filling alone; group II, ultrathin flowable composite lining (0.5-1mm) cocured with overlying composite; group III, thin lining (1-1.5) cocured with overlying composite; group IV, ultrathin lining (0.5-1 mm) precured and group V, thin lining (1-1.5) precured. The teeth were then thermocycled for 1500 cycles (between 5 and 60 °C) and immersed in dye for 24 hours. Cervical microleakage was measured as the extent of dye penetration. Cocured specimens (groups II and III) showed least microleakage and control specimens (group I) showed maximum microleakage. On comparison of curing techniques, cocured specimens (groups II and III) showed less microleakage than precured (groups IV and V). On comparison of lining thickness and type of curing, group IV showed less microleakage than group V. Groups II and III were statistically not significant. It was concluded from the results that ultrathin cocured flowable composite lining specimens improved the marginal sealing with decreased microleakage. In this study, the application of additional flowable composite lining with various thicknesses presented different influences in marginal quality of class II box only composite restorations. A new technique applying an ultrathin flowable composite lining with cocuring technique improved the marginal sealing with decreased microleakage. Restorations with thin lining presented reduced marginal integrity after thermocycling.