In vitro cuspal deflection and microleakage of maxillary premolars restored with novel low-shrink dental composites

Palin, William M.; Fleming, Garry J.P.; Nathwani, Henal; Burke, F J Trevor; Randall, Ros C.

doi:10.1016/j.dental.2004.05.005

Cited by 189 publications

(202 citation statements)

References 26 publications

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“…5), which is in agreement with previous reports [20,24]. Although siloranes exhibit low polymerization shrinkage, they also exhibited an atypical time-cuspal displacement curve, with a 30 s period of no dimensional change.…”

Section: Discussionsupporting

confidence: 92%

“…Using the laser and the principles of optical interference, changes as small as 0.3 m in cuspal position could be detected. Many other techniques to measure shrinkage of this nature like strain gauges and LVDTs rely on mechanical detection devices [23,24]. These techniques are less sensitive to detect cuspal strain because the detectors are in contact or even bonded to the structure undergoing deformation.…”

Section: Discussionmentioning

confidence: 99%

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Dynamics of composite polymerization mediates the development of cuspal strain

et al. 2006

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d e n t a l m a t e r i a l s 2 2 ( 2 0 0 6 ) 896-902 a v a i l a b l e a t w w w . s c i e n c e d i r e c t . c o m j o u r n a l h o m e p a g e : w w w . i n t l . e l s e v i e r h e a l t h . c o m / j o u r n a l s / d e m a Objectives. In the current study, we used electronic speckle pattern interferometry (ESPI) to measure tooth deformation in response to polymerization of five resin composites with a range of polymerization shrinkage. Our hypothesis was that composites with higher polymerization shrinkage should cause more cuspal strain as measured by ESPI.Methods. Standardized MOD cavities were prepared and placed into the ESPI apparatus before the cavities were filled with composites (n = 10). The ESPI apparatus was constructed to measure the out-of-plane displacement of the lingual cusps of the teeth during the polymerization of the restorative material. A thermocouple was attached to the specimen to monitor thermal changes throughout the polymerization process. Results. Experiments with empty preparations demonstrated that the ESPI technique wastemporally responsive and sensitive to dimensional changes. However, the correlation between polymerization shrinkage of composite resins and ESPI-measured tooth deformation was not straightforward. In particular, a flowable material did not deform the tooth significantly more that a conventional hybrid. Further, an experimental silorane material (with the lowest axial shrinkage) induced the least tooth deformation.Significance. We concluded that ESPI is a viable method for assessing cuspal strain induced by shrinkage of bonded composite restorations, but that polymerization shrinkage data may overestimate shrinkage-induced tooth deformation. The rate of polymerization shrinkage appeared to mediate the development of cuspal strain.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Dynamics of composite polymerization mediates the development of cuspal strain

et al. 2006

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“…19,36 Moreover, this type of polymerization was proved to affect the degree of conversion. Previous studies 48,49 carried out to compare the degree of conversion of SIL compared to that of methacrylate-based composites, particularly Z, revealed a lower initial degree of conversion exhibited by SIL. This may allow for longer time for viscous flow of the molecules to relieve some of the developing shrinkage stress.…”

Section: Discussionmentioning

confidence: 99%

Effect of C-factor on Microtensile Bond Strengths of Low-Shrinkage Composites

El-Sahn

El-Kassas

El-Damanhoury

et al. 2011

Operative Dentistry

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SUMMARY This study evaluated the microtensile bond strength (μ-TBS) of low-shrinkage composites with their corresponding adhesive systems, Filtek Silorane/Silorane adhesive (SIL, 3M ESPE AG, Seefeld, Germany) and Aelite LS/One-Step Plus (AL, BISCO Inc, Schaumburg, IL, USA) in cavities with different C-factors. Filtek Z250/Adper Single Bond Plus (Z, 3M ESPE, St Paul, MN, USA) was used as a control. Method Standardized Class I cavities were prepared in extracted human molars after removing occlusal enamel. Cavities were assigned into six different C-factors by applying nail polish to four walls, three walls, two walls adjacent to each other, two walls opposite to each other, one wall, or no walls. Resin composites with their corresponding adhesive systems were applied according to manufacturer instructions. Specimens were sectioned to obtain four rectangular beams from the center of the restorations and μ-TBS was measured. Data were analyzed by Weibull survival analysis. Shrinkage stresses of the resin composites were determined after 30 minutes from the start of light-curing using a tensometer testing machine. Flexure elastic modulus was determined using standard procedures, in accordance with ISO 4049. Data for shrinkage stress and elastic modulus were analyzed by one-way analysis of variance followed by a Tukey multiple-comparisons test (p<0.05). Results μ-TBS of both SIL and AL were not affected by different C-factors; however, the bond strength of Z decreased significantly when the C-factor increased. Shrinkage stress results were 0.94±0.1, 1.79±0.18, and 2.14±0.23 MPa for SIL, AL, and Z, respectively. The flexural modulus of both the SIL and the AL was significantly lower than that of Z. Conclusions Increasing C-factor did not negatively affect the bond strength of low-shrinkage composites.

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“…However, the newly developed silorane-based composite demonstrated a ring-opening expansion polymerization mechanism which reduces the internal shrinkage stress 6 . In addition to low polymerization shrinkage that characterizes this composite, it revealed low mutagenic potential, water sorption, solubility and cusp deflection 10,11 . Apart from the composite based on expanding ring-opening resin during the polymerization process, ormocer, however, is based on inorganic-organic hybrid polymers that are nearly as hard as glass aiming to reduce shrinkage.…”

Section: Introductionmentioning

confidence: 99%

Post-irradiation vickers microhardness development of novel resin composites

Marghalani

2010

Mat. Res.

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The aim of this study was to evaluate the effect of post-irradiation dry aging at different periods of time on Vickers microhardness of some dental composites based on various resin matrices. Sixty four disc-shaped specimens of the resin composites were prepared in a split Teflon mold (8 × 2 mm) and irradiated by Optilux 501 light cure (500 mW.cm -2 for 40 seconds) on their top side. The specimens were aged-dry in dark at 23 and 37 °C for the following storage periods; immediate, 1/2 an hour, 1, 6, 12, 24, 48 and 168 hours. The microhardness values were recorded using a Vickers Hardness Tester at 300 g load for 15 seconds. Results showed that Filtek ® P90 and Definite expressed the highest hardness value followed by Tetric Evoceram and then Premise Enamel. At each aging period, all materials demonstrated significant differences between hardness values of top and base surfaces as well as both temperatures examined (P < 0.05). In conclusion, surface hardness developed gradually in most of the materials reaching optimum after 168 hours post-irradiation aging. Dental composites based on silorane and ormocer resin matrices achieved higher Vickers microhardness than those based on dimethacrylates resin.

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In vitro cuspal deflection and microleakage of maxillary premolars restored with novel low-shrink dental composites

Cited by 189 publications

References 26 publications

Dynamics of composite polymerization mediates the development of cuspal strain

Dynamics of composite polymerization mediates the development of cuspal strain

Effect of C-factor on Microtensile Bond Strengths of Low-Shrinkage Composites

Post-irradiation vickers microhardness development of novel resin composites

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