Investigation of polymerisation shrinkage strain, associated cuspal movement and microleakage of MOD cavities restored incrementally with resin-based composite using an LED light curing unit

Fleming, Garry J.P.; Khan, Sulthan Ibrahim Raja; Afzal, O.; Palin, William M.; Burke, F J Trevor

doi:10.1016/j.jdent.2006.05.003

Cited by 51 publications

(39 citation statements)

References 38 publications

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“…3 It was reported that placing a composite into class II cavities can lead to the inward deformation of the cusp, with the amount of deformation varying from 15 to 50 lm. [4][5][6][7][8][9][10][11][12][13][14][15] Many factors affect the level of cuspal deflection, such as the size and shape of the cavity, 16,17 Young's modulus of the composite resin, 18 amount of polymerization shrinkage, 8,11 use of an intermediary flowable liner, 10 type of curing light, 12 and placement techniques. 9,15,[19][20][21][22] Although the incremental filling technique is preferred over the bulk filling method, it is unclear if the incremental filling technique can reduce the amount of cuspal deflection compared with the bulk filling technique.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Premolar Cuspal Deflection in Bulk or in Incremental Composite Restoration Methods

Me¹,

Park²

2011

Operative Dentistry

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SUMMARY Objectives This study examined the cuspal deflection of maxillary premolars when either a bulk filling or incremental filling technique was employed using a range of composites with different elastic moduli. Methods Four brands of composite materials, Heliomolar (HM, Ivoclar Vivadent, Schaan, Liechtenstein), Heliomolar HB (HH, Ivoclar Vivadent, Schaan, Liechtenstein), Filtec Supreme XT (FS, 3M Dental Product, St Paul, MN, USA), and Renew (RN, Bisco Inc, Schaumburg, IL, USA), as well as three filling techniques, bulk filling, two-layer incremental filling, and three-layer incremental filling methods, were used. One hundred twenty caries-free human premolars were collected and divided into four groups according to the filling material used. Each of these four groups was then subdivided into three groups according to filling method. In group 1, a bulk filling of 0.15 g of each resin was inserted and light-cured with LED light from the occlusal, mesial, and distal surfaces for 60 seconds each. Group 2 was given two horizontal increments, 0.08 g and 0.07 g, with each increment light-cured from the occlusal, mesial, and distal surfaces for 30 seconds each. In group 3, three horizontal increments of 0.05 g were used, each of which was light-cured from the occlusal, mesial, and distal surfaces for 20 seconds each. The cuspal deflection was measured using a customized cuspal deflection measuring machine for 10 minutes after initiating light polymerization. The elastic modulus of each composite resin material was measured using a three-point bending test. Two-way analysis of variance (ANOVA) with a Dunnet test was used to examine the effect of the two variables (curing methods, materials) on the amount of cuspal deflection at the 95% confidence level. In each material, groups 1, 2 and 3 were compared using one-way ANOVA and a Dunnet test at the 95% confidence level. The elastic moduli of HM, HH, FS, and RN were compared using one-way ANOVA and a Tukey test at the 95% confidence level. The relationship between the amount of cuspal deflection in each group and the elastic modulus of the composite was analyzed using a Pearson correlation test. Results The amount of cuspal deflection in HH was larger than in the other materials (HM, FS, and RN; p<0.05). There was no significant difference between HM, FS, and RN. The amount of cuspal deflection was greatest in group 1, followed in order by groups 2 and 3 (p<0.05). The amount of cuspal deflection was in the following order: group 1≥2≥3 in HM, and 1>2, 3 in HH, FS, and RN. The elastic modulus was HH>RN>FS>HM (p<0.05). There was a positive correlation between the cuspal deflection and the elastic modulus of the composite. Conclusions The incremental filling techniques reduced the amount of cuspal deflection in all composite groups with different elastic moduli. The amount of cuspal deflection showed a positive correlation with the elastic modulus of the composite.

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Section: Introductionmentioning

confidence: 99%

Comparison of Premolar Cuspal Deflection in Bulk or in Incremental Composite Restoration Methods

Me¹,

Park²

2011

Operative Dentistry

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“…Other advantages include a consistent light output, no bulb to change and a long service life. [13][14][15][16] The current in vitro study investigated the effect of a thin layer of flowable composite or compomer on microleakage in Class II packable and nanofilled composite restorations that extend apical to the cementoenamel junction and it investigated any differences in microleakage occurring between restorations that were light-cured using a light-emitting diode (LED) or a quartz tungsten halogen (QTH) light curing unit.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Flowable Materials on the Microleakage of Class II Composite Restorations That Extend Apical to the Cemento-enamel Junction

Sadeghi¹,

Lynch²

2009

Operative Dentistry

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SUMMARYThis in vitro study investigated the effects of a thin layer of flowable composite or compomer on microleakage occurring in Class II packable and nanofilled composite restorations that extend apical to the cemento-enamel junction (CEJ). The current study also investigated any differences in microleakage that occur between restorations light-cured using a light-emitting diode (LED) and a quartz tungsten halogen (QTH) light-curing unit. Standardized Class II "slot" cavity preparations were prepared on the mesial and distal surfaces of 72 extracted, unrestored, non-carious premolars (n=144). The gingival margins were placed 1 mm apical to the CEJ. The teeth were divided into two groups (n=72) and restored with a "packable composite" (Filtek P60) or a "nano-filled composite" (Universal Filtek Supreme XT) with or without flowable composite (Flowable Filtek Supreme XT) or flowable composite (Dyract Flow) as gingival liners placed with thicknesses of 1.0 mm. Each increment was cured for 20 seconds before adding the next. One-half of the samples in each group was cured with QTH (Coltolux 75) and the other half with LED (Coltolux LED) LCUs. After a two-week incubation period at 37°C, the specimens were thermocycled (5°C-55°C x 1500), immersed in 0.5% basic fuchsin dye for 24 hours, sectioned and the microleakage was then evaluated at the gingival margin by two examiners using a 0-3 score scale. Within the current study, when flowable liners were used, both the pack- M Sadeghi • CD Lynch Clinical RelevanceThe use of a flowable resin composite or compomer may reduce microleakage at the gingival floor of a deep Class II composite restoration that extends apical to the cemento-enamel junction.

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“…2 Additionally, the shrinkage stress can be manifested as cuspal movement, enamel cracks, dentin postoperative sensitivity and/or marginal gap formation that may compromise synergism at the restoration-tooth interface. 3 This may lead to bacterial microleakage and ultimately pulpal inflammation or necrosis and secondary caries. 4 Different approaches have been recommended in order to prevent the problems inherent to polymerization contraction.…”

Section: Introductionmentioning

confidence: 99%

Cuspal Movement related to Different Polymerization Protocols

Piccioni

Baratto‐Filho

Kuga

et al. 2014

The Journal of Contemporary Dental Practice

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Objective: The aim of this study to investigate the effects of different polymerization protocols on the cuspal movement in class II composite restorations. Materials and methods:Human premolar teeth were prepared with class II cavities and then restored with composite and three-step and two-step etch-and-rinse adhesive systems under different curing techniques (n = 10). It was used a lightemitting-diode curing unit and the mode of polymerization were: standard (exposure for 40 seconds at 700 mW/cm 2 ), pulse-delay (initial exposure for 6 seconds at 350 mW/cm 2 followed by a resting period of 3 minutes and a final exposure of 37 seconds at 700 mW/cm 2 ) and soft-start curing (exposure 10 seconds at 350 mW/cm 2 and 35 seconds at 700 mW/cm 2 ). The cuspal distance (µm) was measured before and after the restorative procedure and the difference was recorded as cuspal movement. The data were submitted to two-way ANOVA and Bonferroni test (p < 0.05). Results:The type of adhesive system did not influenced the cuspal movement for all the curing methods. Standard protocol showed the highest values of cuspal movement and was statistically different from the pulse-delay and soft-start curing modes. Conclusion:Although the cuspal displacement was not completely avoided, alternative methods of photocuring should be considered to minimize the clinical consequences of composites contraction stress.

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Investigation of polymerisation shrinkage strain, associated cuspal movement and microleakage of MOD cavities restored incrementally with resin-based composite using an LED light curing unit

Cited by 51 publications

References 38 publications

Comparison of Premolar Cuspal Deflection in Bulk or in Incremental Composite Restoration Methods

Comparison of Premolar Cuspal Deflection in Bulk or in Incremental Composite Restoration Methods

The Effect of Flowable Materials on the Microleakage of Class II Composite Restorations That Extend Apical to the Cemento-enamel Junction

Cuspal Movement related to Different Polymerization Protocols

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