scholarly journals Influence of light intensity and curing cycle on microleakage of Class V composite resin restorations

2005 ◽  
Vol 13 (2) ◽  
pp. 193-197 ◽  
Author(s):  
Maria Jacinta M. Coelho Santos ◽  
Mário Honorato da Silva e Souza Júnior ◽  
Gildo Coelho Santos Júnior ◽  
Omar El-Mowafy ◽  
Ana Paula Chedid Cavalcanti ◽  
...  
Keyword(s):  
Composite Resin ◽  
Step Cycle ◽  
Class V ◽  
Dye Penetration ◽  
Group I ◽  
Light Curing ◽  
Composite Resin Restorations ◽  
Qth Light ◽  
Curing Cycle ◽  
Resin Restorations

The aim of this study was to determine the effect of a softstart polymerization method from Quartz-Tungsten-Halogen (QTH) and Plasma Arc (PAC) curing units on microleakage of Class V composite resin restorations with dentin cavosurface margins. Seventy-five bovine incisors received standardized class V cavities in all dentin margins. Teeth were divided into 5 equal groups according to the curing cycle. The cavities were incrementally restored with a composite resin (Single Bond/Z-100, 3M). Light curing was applied as follows: Group I: PAC light continuous-cycle curing at 1600 mW/cm² for 3s; Group II: PAC light step-cycle curing (2s at 800 mW/cm² then 4s at 1600 mW/cm²); Group III: QTH light continuous-cycle curing at 400 mW/cm² for 40s; Group IV: QTH light ramp-cycle curing (from 100 to 600 mW/cm² in 15s followed by 25s at 600 mW/cm²); Group V: QTH light pulse-delay curing (200 mW/cm² for 3s followed by 3 min delay then 600 mW/cm² for 30s). Teeth were stored in distilled water at 37ºC for 30 days and then subjected to thermocycling for 500 cycles at 5 and 55ºC. Root apices were sealed and teeth coated with nail varnish before they were immersed in 0.5% fuchsine red dye solution. Teeth were then sectioned and slices were scanned with a computer scanner to determine the area of dye leakage using a computer program (Image Tools). Images of tooth slices were also visually examined under magnification and dye penetration along the tooth/restoration interface was scored. Significant differences in the degree of dye penetration and leakage were detected between groups (p<.05). Groups I and II had significantly higher values of dye penetration and leakage than groups III, IV and V. In conclusion, the use of PAC light curing in a continuous or step cycle modes resulted in increased microleakage of Class V resin composite restorations compared with medium intensity QTH light curing. Pulse, ramp and continuous-cycle curing modes with QTH light resulted in similar degrees of microleakage.

Effect of Cavosurface Margin Configuration of Class V Cavity Preparations on Microleakage of Composite Resin Restorations

2008 ◽  
Vol 9 (2) ◽  
pp. 122-129 ◽  
Author(s):  
Marjaneh Ghavamnasiri ◽  
Mahshid Bagheri
Keyword(s):  
Composite Resin ◽  
Nonparametric Analysis ◽  
Cavity Preparation ◽  
Class V ◽  
Gingival Margin ◽  
Dye Penetration ◽  
Significant Difference ◽  
Composite Resin Restorations ◽  
Resin Restorations

Abstract Aim The aim of this study was to compare the marginal leakage of hybrid and microfilled composite resin in Class V restorations with and without an enamel bevel. Methods and Materials Fifty-six cavities were prepared on the buccal and lingual surfaces of 28 extracted human molars using a round bur with the dimensions of 3×2×1.5 mm. The specimens were divided into two groups of 28 based on the cavosurface margin configuration (beveled and non- beveled). Each group was then divided into two subgroups (n=14) based on the type of composite resin (microfilled and hybrid) used for restoration. After completing restorative procedure, specimens were thermocycled and immersed in 0.5% basic fuchsine. Samples were embedded in polyester and then sectioned both mesiodistally and buccolingually. Dye penetration was observed with a stereomicroscope at 25x magnification. Statistical nonparametric analysis Kruskal-Wallis and Mann-Whitney tests were performed to compare the data (a=0.05). Results There was no statistically significant difference between the two types of composites and two types of enamel margins with respect to microleakage (P>5%). The degree of microleakage at the gingival margin located in dentin of each group was more than that of the enamel margin (P<5%). Conclusion An enamel bevel in a Class V cavity preparation had no effect on the reduction of marginal leakage using either hybrid or microfilled composite resin. Citation Bagheri M, Ghavamnasiri M. Effect of Cavosurface Margin Configuration of Class V Cavity Preparations on Microleakage of Composite Resin Restorations. J Contemp Dent Pract 2008 February; (9)2:122-129.

Marginal leakage in class V composite resin restorations with glass ionomer liners in vitro

1990 ◽  
Vol 63 (5) ◽  
pp. 522-525 ◽  
Author(s):  
R.S. Mathis ◽  
J.P. DeWald ◽  
C.R. Moody ◽  
J.L. Ferracane
Keyword(s):  
Composite Resin ◽  
Glass Ionomer ◽  
Class V ◽  
Composite Resin Restorations ◽  
Resin Restorations

Microleakage in class V composite resin restorations treated with CO 2 laser: an in-vitro study

2000 ◽  
Author(s):  
Andrea Naddeo Lopes da Cruz ◽  
Narciso Garone Netto ◽  
Adriana Fruges Pagliari ◽  
Juliana Matson ◽  
Ricardo S. Navarro ◽  
...  
Keyword(s):  
Composite Resin ◽  
In Vitro Study ◽  
Vitro Study ◽  
Class V ◽  
Composite Resin Restorations ◽  
Resin Restorations

scholarly journals Effect of Cavity Disinfection with Chlorhexidine on Marginal Gap of Class V Composite Restorations Bonded with a Universal Adhesive Using Self-Etch and Etch-and-Rinse Bonding Strategy

2020 ◽  
Author(s):  
Soodabeh Kimyai ◽  
Narmin Mohammadi ◽  
Mahmoud Bahari ◽  
Elahe Pesyanian ◽  
Farhood Pesyanian
Keyword(s):  
Composite Resin ◽  
Gap Size ◽  
Marginal Gap ◽  
Universal Adhesive ◽  
Class V ◽  
Etch And Rinse ◽  
The Mean ◽  
Composite Resin Restorations ◽  
Self Etch ◽  
Resin Restorations

Objectives: This in-vitro study aimed to evaluate the effect of cavity disinfection with chlorhexidine (CHX) on marginal gaps of Class V composite resin restorations bonded with a universal adhesive using self-etch and etch-and-rinse bonding strategy. Materials and Methods: Sixty sound human premolars were randomly assigned to two groups (n=30): group 1 (CHX) and group 2 (no CHX). Each group was divided into two subgroups (n=15) according to the bonding strategy of the universal adhesive (self-etch or etch-and-rinse). Class V cavities were prepared on the buccal surfaces of the teeth. The occlusal and gingival margins of the cavities were placed in enamel and dentin, respectively. In the first and second subgroups of both groups, the All-Bond Universal adhesive was applied with self-etch and etch-and-rinse bonding strategy, respectively. After restoration and thermocycling, the samples were sectioned, and marginal gaps at the gingival margins were measured in micrometer (µm) under a stereomicroscope. Two-way analysis of variance (ANOVA) was used to compare marginal gaps between the groups and the subgroups. Results: The mean marginal gap size was significantly affected by cavity disinfection (P=0.001) and bonding strategy (P=0.002). However, the interaction effect of these two factors on the mean marginal gap size was not significant (P=0.79). Conclusion: The use of CHX resulted in larger marginal gaps at the gingival margins of Class V composite resin restorations. Irrespective of disinfection, the self-etch bonding strategy resulted in larger marginal gaps compared to the etch-and-rinse bonding strategy.

Split-increment Technique: An Alternative Approach for Large Cervical Composite Resin Restorations

2007 ◽  
Vol 8 (2) ◽  
pp. 121-128 ◽  
Author(s):  
Khamis A. Hassan ◽  
Salwa E. Khier
Keyword(s):  
Composite Resin ◽  
Root Surface ◽  
Tooth Structure ◽  
Carious Lesions ◽  
Alternative Approach ◽  
Light Curing ◽  
Composite Resin Restorations ◽  
Natural Tooth ◽  
Made In ◽  
Resin Restorations

Abstract Aim This article proposes and describes the split-increment technique as an alternative for placement of composite resin in large cervical carious lesions which extend onto the root surface. Technique Two flat 1.5 mm thick composite resin increments were used to restore these cervical carious lesions. Prior to light-curing, two diagonal cuts were made in each increment in order to split it into four triangular-shaped flat portions. The first increment was applied to cover the entire axial wall and portions of the four surrounding walls. The second increment was applied to fill the cavity completely covering the first one and the rest of the four surrounding walls as well as sealing all cavity margins. Clinical Significance This technique results in the reduction of the C-factor and the generated shrinkage stresses by directing the shrinking composite resin during curing towards the free, unbonded areas created by the two diagonal cuts. The proposed technique would also produce a more naturally looking restoration by inserting flat dentin and enamel increments of composite resin of a uniform thickness which closely resembles the arrangement of natural tooth structure. Citation Hassan KA, Khier SE. Split-increment Technique: An Alternative Approach for Large Cervical Composite Resin Restorations. J Contemp Dent Pract 2007 February;(8)2:121-128.

Effect of bleaching on microleakage of class V composite resin restorations – in vitro study

2019 ◽  
pp. 89-94
Author(s):  
Tânia Pereira ◽  
A. Azevedo ◽  
M. Vasconcelos ◽  
Pedro Mesquita ◽  
Maria T. Carvalho ◽  
...  
Keyword(s):  
Composite Resin ◽  
In Vitro Study ◽  
Vitro Study ◽  
Class V ◽  
Composite Resin Restorations ◽  
Resin Restorations
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