The deformation of cusps by bonded posterior composite restorations: an in vitro study

Causton, B.E.; Miller, Bess; Sefton, J.

doi:10.1038/sj.bdj.4805746

Cited by 72 publications

(36 citation statements)

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“…This is particularly the case for large bulk-filled cavities with high C-factors where the cavosurface margins are located in enamel, which is of a brittle nature. Tooth fracture is still a frequently occurring problem caused by induced contraction stresses when polymerization shrinkage takes place under constrained conditions with the composite bonded between cavity walls 21,22) . In this study, 2-MJ-APX group which employed an incremental filling technique showed improved marginal integration with no enamel fracture 23) .…”

Section: Discussionmentioning

confidence: 99%

Effect of filler content of flowable composites on resin-cavity interface

et al. 2009

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The purpose of this in vitro study was to evaluate marginal integrity and wall adaptation in 1-and 2-mm-deep cavities restored with a high filler-loaded flowable composite in comparison to a flowable composite with lower filler content and a conventional hybrid composite. 1-mm-deep dentin and 2-mm-deep enamel-dentin Class I cavities were prepared and restored with a self-etch adhesive and with one of the composites. Samples were crosscut and evaluated for marginal integrity and gap formation using a digital microscope. Selected samples were also observed using a scanning electron microscope. For 1-mm-deep cavities, no differences in marginal integrity and wall adaptation were observed among the three composites. For 2-mm-deep cavities, those restored with the bulk technique and with the higher filler-loaded flowable composite demonstrated a similar outcome as that of the conventional hybrid composite. On the effect of restorative techniques, cohesive enamel defects were observed in bulk-filled 2-mm-deep cavities. However, when the incremental technique was used in conjunction with the higher filler-loaded flowable composite and the conventional hybrid composite for 2-mm-deep cavities, superior results were obtained.

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Section: Discussionmentioning

confidence: 99%

Effect of filler content of flowable composites on resin-cavity interface

et al. 2009

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“…Moreover, cusp displacement may occur, resulting in postoperative sensitivity, crack, or fracture development. [11][12][13][14] However, it is unclear if shrinkage has an effect on the obtained proximal contact tightness.…”

Section: Introductionmentioning

confidence: 99%

Influence of Volumetric Shrinkage and Curing Light Intensity on Proximal Contact Tightness of Class II Resin Composite Restorations: In Vitro Study

El-Shamy¹,

Saber²,

Dörfer³

et al. 2012

Operative Dentistry

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Clinical RelevanceVolumetric polymerization shrinkage and curing light intensity should be considered when restoring proximal contact of class II cavities with resin-based materials. SUMMARYBackground: Proximal contact tightness of class II resin composite restorations is influenced by a myriad of factors. Previous studies investigated the role of matrix band type and thickness, consistency of resin composite, and technique of placement. However, the effect of volumetric shrinkage of resin and intensity of curing light has yet to be determined. Thus, the aim of this study was to identify the influence of these factors on the proximal contact tightness when restoring class II cavity preparations in vitro.

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“…In 1997, Causton and others reported that placement of bonded composite restorations in extracted teeth resulted in a decrease in the distance between cusps (cuspal flexure), which may have resulted in post-operative sensitivity and opened up pre-existing enamel microcracks. 23 In the past, various techniques have been recommended to minimize the effects of polymerization shrinkage. They include incremental placement; 24 the "guided shrinkage" technique; 25 soft-start polymerization and pulse delay techniques' use of low modulus lining materials, such as glass ionomers; 26 resinous liners; 27 new-generation dentin bonding agents 28 and megafillers.…”

Section: Discussionmentioning

confidence: 99%

Effect of Cyclic Loading on Marginal Adaptation and Bond Strength in Direct vs Indirect Class II MO Composite Restorations

Aggarwal

Logani²,

Jain³

et al. 2008

Operative Dentistry

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Indirect composite restorations have better marginal adaptation than direct composite restorations, and cyclic loading has a more deteriorating effect on the marginal adaptation and microtensile bond strength of direct composite restorations than indirect composite restorations. SUMMARYThis study evaluated the effect of cyclic loading on the marginal adaptation and microtensile bond strength of direct vs indirect Class II composite restorations in an in-vitro model. Forty Class II cavities were prepared on the mesial surface of extracted human maxillary first premolars and divided into two groups: Group I-direct composite restorations and Group II-indirect composite restorations. Groups I and II were further divided into subgroups: A (without cyclic loading) and B (with cyclic loading of 150,000 cycles at 60N). The gingival margin of the proximal box was evaluated at 200x magnification for marginal adaptation in a low vacuum scanning electron microscope. The restorations were sectioned perpendicular to the bonded surface into 1 mm thick slabs. The slabs were further trimmed at the interface to produce a cross-sectional surface area of approximately 1 mm 2 . All specimens were subjected to microtensile bond strength testing. The marginal adaptation was analyzed using descriptive studies and bond strength data were analyzed by one-way ANOVA test. The indirect composite restorations performed better under cyclic loading.Vivek Aggarwal, MDS, senior resident,

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The deformation of cusps by bonded posterior composite restorations: an in vitro study

Cited by 72 publications

References 0 publications

Effect of filler content of flowable composites on resin-cavity interface

Effect of filler content of flowable composites on resin-cavity interface

Influence of Volumetric Shrinkage and Curing Light Intensity on Proximal Contact Tightness of Class II Resin Composite Restorations: In Vitro Study

Effect of Cyclic Loading on Marginal Adaptation and Bond Strength in Direct vs Indirect Class II MO Composite Restorations

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