Factors involved in the development of polymerization shrinkage stress in resin-composites: A systematic review (original) (raw)

Managing the polymerization shrinkage of resin composite restorations: a review

SADJ : journal of the South African Dental Association = tydskrif van die Suid-Afrikaanse Tandheelkundige Vereniging, 2007

Polymerization shrinkage (PS) of resin composites almost invariably generates a degree of stress at the tooth/restoration interface. The magnitude of the stresses so produced depends on resin composite composition and its ability to flow before solidification, which is, in turn related to cavity configuration and curing characteristics of the composite. The purpose of the present article is to review the published literature on the management of PS, with special reference to those elements that are under the control of the dentist. Available data from laboratory, finite element analysis and review articles, relating to the methods and techniques that have been proposed for managing the problem of PS, are included. On the basis of the review, it may be concluded that PS has negative effects on the resin composite/tooth interface. The review identifies the preferred handling and/or management techniques that clinicians might employ to reduce the levels of PS that might affect the rest...

Polymerization shrinkage of composite resins: consequences and control

Bonding strategies associated with the aesthetic and conservative properties of resin materials have increased their popularity in restorative dentistry. Direct composite restorations are one of the most prevalent medical interventions on the human body, with millions of composite restorations placed each year around the world. The optimal performance of these restorations depends on the proper polymerization of the resin component, which is characterized by the transformation of monomers into polymers, accompanied by volumetric reduction of the material. Despite several improvements in new restorative materials in recent years, the disadvantages related to polymerization shrinkage of resin composites remain a clinical problem. The aim of this study is to explore, through an integrative literature review, the causes of polymerization shrinkage of composite resins, as well as their risks and how to control them, in order to obtain long-lasting restorations. A consequence of shrinkage stress can be related to the detachment along the restoration/tooth interface or restoration margins, resulting in internal and marginal gaps, microcracks of one or both restorative material and tooth structure, marginal stain, and cusp deflection. Clinical Relevance-Clinicians must understand the concept of polymerization shrinkage stress and realize that the quality of composite resin restorations depends on the successful management of these efforts.

Shrinkage of Dental Composite Resin: ContemporaryUnderstanding its Enigmas and How to Solve? A Reviewc

2020

Citation: Nagy Abdulsamee., et al. “Shrinkage of Dental Composite Resin: Contemporary Understanding its Enigmas and How to Solve? A Review”. EC Dental Science 19.5 (2020): 03-17. Abstract Nowadays dental patients are seeking a restorative material to their teeth that fulfilled most of the ideal requirements for such use especially aesthetic and functional performance needs. Traditionally composite resin can fulfill these requirements but with the major drawback of shrinkage during polymerization. The shrinkage will be manifested as marginal leakage, cuspal deflection, tooth or restoration fracture, postoperative sensitivity that ends ultimately by failed restoration. The aim of the current work was to pay attention of dental workers to the origin of polymerization shrinkage, its consequences, factors affecting, methods used to measure it, and how can they minimize it for promoting longevity of the restoration.

Polymerization Shrinkage of Composite Resins: A Review

The greatest limitation in the use of composite resins as a posterior restorative material seems to be shrinkage during polymerization, which often leads to marginal fracture , subsequent secondary caries , marginal staining , restoration displacement , tooth fracture and, or post operative sensitivity . The objectives of this article are to throw light on the origin of polymerization shrinkage, the clinical factors affecting polymerization stress, and methods advocated to reduce shrinkage stress and the effectiveness of these methods.

Shrinkage stress, long-term adaptation and bond strength of low-shrinkage composite resins

International Journal of Adhesion and Adhesives, 2016

To evaluate the internal adaptation, bond strength, and polymerization stress of silorane-and methacrylate-based composite resins. Material and methods: Three methacrylate-based composite resins (Heliomolar; Tetric N-Ceram and Aelite LS) and one silorane-based composite resin (Filtek Silorane) were tested. Polymerization stress (n ¼5) was determined by the insertion of the composite resin between rods of polymethyl methacrylate. The ratio of the maximum force of contraction was recorded and the cross-sectional area of the rod was used to calculate the nominal stress. Bond strength was evaluated by microtensile bond test. Dentin surfaces of human third molars were bonded, sectioned, and stored for 24 h or 1 year in distilled water before the bond strength test. The ratio of maximum force and the adhered area was used for the bond strength calculation. For internal adaptation analysis, third molars received Class II cavities and were restored according to either an incremental oblique or bulk-filling technique. After being sectioned perpendicularly, impressions were taken and epoxy resin replicas were obtained of the internal surfaces of the restorations (after 24 h and 1 year of storage) to analyze gap formation using scanning electron microscopy. Results: Filtek Silorane showed the highest bond strength after one year of storage, the lowest formation of gaps, and polymerization stress similar to methacrylate-based materials. Conclusion: Silorane restorative material presented polymerization stress comparable to that of methacrylate-based composite resins, stable dentin bond strength after one year and better internal adaptation to the cavity walls, showing good alternative to traditional composite resins and promising longevity.

Shrinkage Stresses Generated during Resin-Composite Applications: A Review

Journal of dental biomechanics, 2010

Many developments have been made in the field of resin composites for dental applications. However, the manifestation of shrinkage due to the polymerization process continues to be a major problem. The material's shrinkage, associated with dynamic development of elastic modulus, creates stresses within the material and its interface with the tooth structure. As a consequence, marginal failure and subsequent secondary caries, marginal staining, restoration displacement, tooth fracture, and/or post-operative sensitivity are clinical drawbacks of resin-composite applications. The aim of the current paper is to present an overview about the shrinkage stresses created during resin-composite applications, consequences, and advances. The paper is based on results of many researches that are available in the literature.

Polymerization shrinkage of resin-based composites for dental restorations: A digital volume correlation study

Dental Materials, 2019

Objective. Resin-based composites are widely used in dental restorations; however, their volumetric shrinkage during polymerization leads to several issues that reduce the restoration survival rates. For overcoming this problem, a deep study of shrinkage phenomena is necessary. Methods. In this study, micro-tomography (-CT) is combined with digital volume correlation (DVC) to investigate the effect of several factors on the polymerization strain of dental composites in model cavities: the presence/absence of an adhesive, the use of transparent/blackened cavities, and irradiation times between 1 and 40 s. Results. The results indicate that the presence of an adhesive at the interface between the cavity and composite does not reduce the total strain but instead limits it to a preferential direction. In addition, regardless of the conditions, the main strain is generated along the axis parallel to the polymerization irradiation (the vertical axis). Finally, the total strain appears to occur in the first 5 s of irradiation, with no further evolution observed for longer irradiation times. Significance. This work provides new insight into resin-based composite shrinkage and demonstrates the benefit of coupling DVC and-CT to better understand the degradation mechanisms of these materials.