Polymerization shrinkage-strain and microleakage in dentin-bordered cavities of chemically and light-cured restorative materials

Rosin, Michael; Urban, A.D.; Gärtner, Ch.; Bernhardt, Olaf; Splieth, Christian H.; Meyer, Georg

doi:10.1016/s0109-5641(01)00078-1

Cited by 64 publications

(44 citation statements)

References 12 publications

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“…19 In this case, the leakage observed may be created mainly by the structure defects within the bonding interface and therefore shows no correlation to the polymerization contraction of the restorations. 20 Accordingly, it is likely that the leakage in the present study demonstrates more action of the structure defects and less action of polymerization contraction of the restoration. Regardless, all of the leakage can be marked by a tracer such as silver solution.…”

Section: Discussionmentioning

confidence: 65%

Detection of Marginal Leakage of Class V Restorations In Vitro by Micro–Computed Tomography

Zhao

et al. 2014

Operative Dentistry

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Micro-computed tomography can provide in vitro nondestructive detection of leakage around a composite restoration to display entire three dimensional dentin leakage patterns with accuracy comparable to that of the conventional dye-penetration method. SUMMARYThis in vitro study evaluated the efficacy of micro-computed tomography (CT) in marginal leakage detection of Class V restorations. Standardized Class V preparations with cervical margins in dentin and occlusal margins in enamel were made in 20 extracted human molars and restored with dental bonding agents and resin composite. All teeth were then immersed in 50% ammoniacal silver nitrate solution for 12 hours, followed by a developing solution for eight hours. Each restoration was scanned by micro-CT, the depth of marginal silver leakage in the central scanning section was measured, and the three-dimensional images of the silver leakage around each restoration were reconstructed. Afterward, all restorations were cut through the center and examined for leakage depth using a microscope. The silver leakage depth of each restoration obtained by the micro-CT and the microscope were compared for equivalency. The silver leakage depth in cervical walls observed by micro-CT and microscope showed no significant difference; however, in certain cases the judgment of leakage depth in the occlusal wall in micro-CT image was affected by adjacent enamel structure, providing less leakage depth than was observed with the microscope (p,0.01). Micro-CT displayed the threedimensional image of the leakage around the Class V restorations with clear borders only in the dentin region. It can be concluded that micro-CT can detect nondestructively the leakage around a resin composite restoration in two and three dimensions, with accuracy comparable to that of the conventional microscope method in the dentin region but with inferior accuracy in the enamel region.

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Section: Discussionmentioning

confidence: 65%

Detection of Marginal Leakage of Class V Restorations In Vitro by Micro–Computed Tomography

Zhao

et al. 2014

Operative Dentistry

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“…Cavosurface marginal discoloration might indicate a breakdown of the bond between restorative material and tooth structure and, consequently, marginal leakage. In composite restorations, polymerization shrinkage is one of the main factors causing marginal discoloration, 39 especially in occlusal cavities with a high C-factor, the ratio between bonded walls to free walls. 40 In the present study, the score of the surface roughness criterion of all the nanoceramic and nanofilled restorations was Alpha, while the score was Bravo for two ormocer and two microhybrid restorations at the one-year examination.…”

Section: Discussionmentioning

confidence: 99%

Clinical Performance of Ormocer, Nanofilled, and Nanoceramic Resin Composites in Class I and Class II Restorations: A Three-year Evaluation

El-Embaby

AbdAllah

2014

Operative Dentistry

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Ormocer, nanofilled, and nanoceramic composites exhibited clinical performance similar to that of conventional microhybrid composite in Class I and Class II restorations. SUMMARYPurpose: This prospective long-term clinical trial evaluated and compared the three-year clinical performance of an ormocer, a nanofilled, and a nanoceramic resin composite with that of a microhybrid composite placed in Class I and Class II cavities.Methods: Forty patients, each with four Class I and II restorations under occlusion, were enrolled in this study. A total of 160 restorations were placed, 25% for each material, as follows: an ormocer-based composite, Admira; a nanofilled resin composite, Filtek Supreme XT; a nanoceramic resin composite, Ceram X; and a microhybrid resin composite, Tetric Ceram. A single operator placed all restorations according to the manufacturers' instructions. Immediately after placement the restorations were finished/polished. Clinical evaluation was performed at baseline and at yearly intervals after placement by two other independent examiners using modified US Public Health Service (USPHS) criteria. The changes in the USPHS parameters during the three-year period were analyzed with the Friedman test. Comparison of the baseline scores with those at the recall visits was made , 2014, 39-1, 32-42 using the Wilcoxon signed rank test. The level of significance was set at p , 0.05.Results: All materials showed only minor changes, and no differences were detected between their performance at baseline and after three years. Only two ormocer, one nanofilled, and one microhybrid restorations in molars failed because of loss of retention.Regarding the clinical performance, there were no statistically significant differences among the materials used (p.0.05).Conclusions: The ormocer, nanofilled, and nanoceramic composites provided acceptable clinical performance over a three-year period.

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“…Other methods of measuring volume change have employed the use of strain gauges [19,20], linometers [21], density gradient columns [4] and even the straightforward principle of buoyancy [22].…”

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confidence: 99%

Evaluation of cure shrinkage measurement techniques for thermosetting resins

2010

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Resin chemical shrinkage dictates the surface integrity and the roughness of a composite structure. Thus, to minimize surface failures and to produce a good surface quality it is a requisite to be able to measure and track resin shrinkage during the cure process. This manuscript investigates and evaluates the measuring and monitoring of real-time resin shrinkage using a rheometer, a helium-based pycnometer and a thermo-mechanical analyzer (TMA) for ambient curing UP and epoxy resins. Shrinkage readings obtained from the newly developed robust technique with the rheometer concur well with readings from the traditional pycnometric method. They also coincide within the accepted literature values of 7-10% and 3.5-4.5% for the UP and epoxy systems, respectively. Shrinkage measurements during post-cure were effectively carried out at an elevated temperature, suggesting that the methodology provided can be applied to non-ambient curing systems.The TMA was found to be unsuccessful in measuring shrinkage reliably.

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Polymerization shrinkage-strain and microleakage in dentin-bordered cavities of chemically and light-cured restorative materials

Cited by 64 publications

References 12 publications

Detection of Marginal Leakage of Class V Restorations In Vitro by Micro–Computed Tomography

Detection of Marginal Leakage of Class V Restorations In Vitro by Micro–Computed Tomography

Clinical Performance of Ormocer, Nanofilled, and Nanoceramic Resin Composites in Class I and Class II Restorations: A Three-year Evaluation

Evaluation of cure shrinkage measurement techniques for thermosetting resins

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