Visible light‐cured composite resins: polymerization contraction, contraction pattern and hygroscopic expansion

Hansen, Erik Keith

doi:10.1111/j.1600-0722.1982.tb00745.x

Cited by 67 publications

(64 citation statements)

References 9 publications

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“…in accordance with previous results (Hansen, 1982), the largest contraction was most often found in the apical area of the cavity, also when using techniques B and C. The rationale for testing two different oblique techniques was that placing the first increment in the coronal area would result in a small residual cavity in the apical area, where the largest contraction was most often found. The hypothesis was that this method would result in a more pronounced reduction of the apical contraction than if the first increment were placed apically, but no statistically-significant difference for marginal gap width was found betweeli the two oblique techniques (Fig.…”

Section: Methodssupporting

confidence: 89%

“…The method used has been described in detail in a previous paper (Hansen, 1982). Briefly, the procedures were as follows:…”

Section: Methodsmentioning

confidence: 99%

“…However, the volume polymerization contraction has little, if any, relationship to the actual wall-to-wall polymerization contraction in a dental cavity (Asmussen and Jorgensen, 1971;Hansen, 1986). One of the reasons for the discrepancy between the volume contraction of a free test specimen and the wall-to-wall contraction in a cavity is probably that the volume contraction is independent of several important variables, such as the cavity design, the filling surplus, the area of the free surface of the filling, the contraction pattern in a dental cavity, and the Theological properties of the restorative resin used (Knappwost, 1951;Bowen, 1967;Asmussen, 1975;Hansen, 1982Hansen, , 1984Hansen, , 1986Davidson et al, 1984).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Cavity Depth and Application Technique on Marginal Adaptation of Resins in Dentin Cavities

Hansen

1986

J Dent Res

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The wall-to-wall polymerization contraction of two restorative resins was investigated in butt-joint dentin cavities prepared in extracted human teeth. The cavity diameter was 4 mm, and the cavity depth ranged between 0.5 and 3.0 mm. The width of the maximum marginal contraction gap was measured, using a light microscope, approximately 0.1 mm below the original free surfaces of the fillings. It was found that increasing the cavity depth from 0.5 to 3.0 mm did not influence the marginal contraction gap close to the free surfaces of the fillings. It was also found that a two-phase application technique, where the surface of the first layer was placed parallel to the free surface of the cavity, did not reduce the marginal contraction gap, while a two-phase technique with oblique layers resulted in approximately a 25% reduction.

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Section: Methodssupporting

confidence: 89%

“…The method used has been described in detail in a previous paper (Hansen, 1982). Briefly, the procedures were as follows:…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Cavity Depth and Application Technique on Marginal Adaptation of Resins in Dentin Cavities

Hansen

1986

J Dent Res

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“…However, shrinkage in cavities is mainly influenced by adhesion, flow on the free surface, and local polymerization 5) . The location and orientation of the irradiating light are also important factors in improving cavity adaptation 16,17) .…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional X-ray micro-computed tomography analysis of polymerization shrinkage vectors in flowable composite

et al. 2014

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The polymerization shrinkage of flowable resin composites was evaluated using air bubbles as traceable markers. Three different surface treatments i.e. an adhesive silane coupling agent, a separating silane coupling agent, and a combination of both, were applied to standard cavities. Before and after polymerization, X-ray micro-computed tomography images were recorded. Their superimposition and comparison allowed position changes of the markers to be visualized as vectors. The movement of the markers in the resin composite was, therefore, quantitatively evaluated from the tomographic images. Adhesion was found to significantly influence shrinkage patterns. The method used here could be employed to visualize shrinkage vectors and shrinkage volume.

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“…However, different factors have been suggested to affect the direction of polymerization shrinkage of the light-curing resin composite in clinical situations. These factors include cavity design (C-factor), the polymerization reaction rate, thickness, translucency and rheological properties of the resin composite and the intensity and direction of the light (Hansen, 1982;Hansen, 1986;Feilzer & others, 1987;Uno & Asmussen, 1991;Unterbrink & Muessner, 1995;Asmussen & Peutzfeldt, 1999). Interfacial bond strength was also considered a contributing factor in a theoretical finite element analysis (FEA) (Versluis, Tantbirojn & Douglas, 1998).…”

Section: Introductionmentioning

confidence: 99%

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2002

Operative Dentistry

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Aim and ScopeOperative Dentistry publishes articles that advance the practice of operative dentistry. The scope of the journal includes conservation and restoration of teeth; the scientific foundation of operative dental therapy; dental materials; dental education; and the social, political, and economic aspects of dental practice. Review papers, book reviews, letters, and classified ads for faculty positions are also published. Subscriptions: Fax (317) 852-3162Current pricing for individual, institutional and dental student subscriptions (both USA and all other countries) can be found at our website: www.jopdent.org, or by contacting our subscription manager:Fax 317/852-3162 E-mail: jmatis@indy.rr.com Information on single copies, back issues and reprints is also available. Make remittances payable (in US dollars only) to Operative Dentistry and send to the above address. Credit card payment (Visa, MasterCard, or JCB-Japanese equivalent) is also accepted by providing card type, card number, expiration date, and name as it appears on the card. ContributionsContributors should study the instructions for their guidance printed in this journal and should follow them carefully. PermissionFor permission to reproduce material from Operative Dentistry please apply to Operative Dentistry at the above address.The views expressed in Operative Dentistry do not necessarily represent those of the Academies or of the Editors. Editorial OfficeOperative Dentistry Indiana University School of Dentistry, Room S411 1121 West Michigan Street, Indianapolis, Fax: (317) Dentistry, 2002, 27, 209 T he annual gatherings of the various academies in Chicago have just ended. The many opportunities for reunions that these meetings provide buoy me up and underscore the pure joy of having chosen to be a dentist. It is a time when we share ideas, experiences and concerns and it highlights the core values to which we jointly aspire. These gatherings are also a time to express the cares, concerns and frustrations that those of us in private practice, the military and academia carry in our hearts.One such concern and frustration relates to the dental educational process of tomorrow's dentists. A recent article featured in my alumni journal emphasized the dire need for alumni to offer their services in the clinical area of this Eastern school. While the plea was well put, few are accepting the challenge to teach and train future dentists. Many dentists state that choosing private practice over teaching is an issue of economics.Since private practice certainly provides greater income potential than teaching, it is easy to understand why students who incur more than $100,000 of indebtedness would have a hard time choosing an academic career over establishing their own practice. However, what about those of us who have cleared the early hurdles of indebtedness?We cannot expect the recent graduate to be adequately equipped to teach. We cannot reasonably look to private practitioners to be ready to teach if they have little or no experience in A...

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Visible light‐cured composite resins: polymerization contraction, contraction pattern and hygroscopic expansion

Cited by 67 publications

References 9 publications

Effect of Cavity Depth and Application Technique on Marginal Adaptation of Resins in Dentin Cavities

Effect of Cavity Depth and Application Technique on Marginal Adaptation of Resins in Dentin Cavities

Three-dimensional X-ray micro-computed tomography analysis of polymerization shrinkage vectors in flowable composite

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