Journal ArticleDOI
Dental composites/glass ionomers: the materials.
TLDR
Most commercial dental composites contain liquid dimethacrylate monomers (including BIS-GMA or variations of it) and silica-containing compositions as inorganic reinforcing filler particles coated with methacrylated-functional silane coupling agents to bond the resin to the filler.Abstract:
Most commercial dental composites contain liquid dimethacrylate monomers (including BIS-GMA or variations of it) and silica-containing compositions as inorganic reinforcing filler particles coated with methacrylate-functional silane coupling agents to bond the resin to the filler. They also contain initiators, accelerators, photo-initiators, photosensitizers, polymerization inhibitors, and UV absorbers. Durability is a major problem with posterior composites. The typical life-span of posterior composites is from three to 10 years, with large fillings usually fewer than five years. Polymerization shrinkage and inadequate adhesion to cavity walls are remaining problems. Some pulp irritation can occur if deep restorations are not placed over a protective film. Some have advocated the use of glass-ionomer cement as a lining under resin composite restorations in dentin. The concept of glass-ionomer cements (GICs) was introduced to the dental profession in the early 1970's. Current GICs may contain poly(acrylic acid) or a copolymer. Higher-molecular-weight copolymers may also be used to improve the physical properties of some GICs. Stronger and less-brittle hybrid materials have been produced by the addition of water-soluble compatible polymers to form light-curing GIC formulations. The ion-leachable aluminosilicate glass powder, in an aqueous solution of a polymer or copolymer of acrylic acid, is attacked by the hydrated protons of the acid, causing the release of aluminum and calcium ions. Salt bridges are formed, and a gel matrix surrounds the unreacted glass particles. The matrix is adhesive to mineralized tissues. Provisions must be made for maintenance of the water balance of restorations for the first 24 hours.(ABSTRACT TRUNCATED AT 250 WORDS)read more
Citations
More filters
Journal Article
An Introduction to Silanes and Their Clinical Applications in Dentistry
TL;DR: Dental materials offer a continuously challenging forum for silanes, and silanes will play an essential role in material development.
Journal ArticleDOI
Relation of Dental Composite Formulations To Their Degradation and the Release of Hydrolyzed Polymeric-Resin-Derived Products:
TL;DR: A review of the principal modes of dental composite material degradation and related them to the specific components of the composites themselves is provided in this paper, with particular emphasis on the selection of the monomer resins, the filler content, and the degree of monomer conversion after the clinical materials are cured.
Relation of dentalcompositeformulations to theirdegradation and the release of hydrolyzedpolymeric-resin-derived products
J. P. Santerre,B. W. Leung +1 more
TL;DR: The findings of the past decade clearly indicate that there are many reasons to probe the issue of biochemical stability of composite resins in the oral cavity, with the expectation that these studies will lead to a more concise definition of biocompatibility issues related to dental composites.
Book ChapterDOI
Polymeric dental composites : properties and reaction behavior of multimethacrylate dental restorations
TL;DR: The use of poly (multimethacrylates) as dental composites is summarized from both fundamental and practical sides and properties of current composite materials are presented.
Journal ArticleDOI
Mechanical properties of visible light-cured resins reinforced with hydroxyapatite for dental restoration.
Raul W Arcı́s,A. López-Macipe,Manuel Toledano,Estrella Osorio,Rafael Rodríguez-Clemente,Jaime Murtra,Maria Alejandra Fanovich,Concepción Domingo Pascual +7 more
TL;DR: An adequate surface modification of the hydroxyapatite particles conferred enhanced mechanical properties to the final dental composite, and microscopic-hydroxyap atite particles are preferred to nanoscopic ones.
References
More filters
Journal ArticleDOI
A new translucent cement for dentistry. The glass ionomer cement
Alan D. Wilson,B E Kent +1 more
Journal ArticleDOI
The glass‐ionomer cement, a new translucent dental filling material
Alan D. Wilson,B. E. Kent +1 more
TL;DR: A new translucent cement, the product of the reaction between ion-leachable glass and an aqueous solution of polyacrylic acid, is described and a proposed setting mechanism is advanced.