What is amalgam microleakage?
Microleakage is a problem of all fresh amalgam restorations and is clinically undetectable. Because microleakage may be responsible for pulp irritation, pulp inflammation, necrosis, and recurrent caries, it is essential to prevent and control it.
What is microleakage?
Microleakage is defined as the “diffusion of the bacteria, oral fluids, ions and molecules into the tooth and the filling material interface” OR “defined as the clinically undetectable passage of bacteria, fluids, molecules or ions between tooth and the restorative or filling material.” Many studies emphasize that …
What causes microleakage?
Microleakage occurs due to the formation of gaps on the surface, which can be caused by several factors such as (1) polymerization shrinkage, which causes tension in the area between the teeth and the restoration; (2) formation of microcracks at the margins and consequent defects or damage to the adhesion of the …
How does bonded amalgam prevent microleakage on the restoration?
Clinical significance: Bonded amalgam restorations prevent over-preparation and reduce the tooth flexure. GIC type I under amalgam provides chemical bonding in between amalgam and tooth structure and thus reduces the microleakage.
How can you prevent microleakage?
Correct cavity margin preparations, proper amalgam manipulation, proper condensation, and burnishing can min imize microleakage in amalgam resto rations. The use of conventional varnish or dentin adhesive on cavity walls before the insertion of the amalgam is the best method to reduce microleakage.
What are signs of microleakage?
The clinical symptoms associated with the occurrence of microleakage are breakdown and discoloration of margins, secondary caries, increase in postoperative sensitivity, and pulp pathology (6). Many different techniques have been used to demonstrate microleakage.
How is microleakage prevented?
Because the different physical properties of composite resin and tooth structure cause microleakage in composite tooth restorations, it is possible to eliminate microleakage by making composite’s physical properties more similar to those of tooth structure.
What is bonded amalgam?
The technique of bonding direct restorations such as amalgam to damaged tooth structure can provide the patient with an economical and minimally invasive solution to the problem of a damaged tooth. In the current financial climate many patients may defer or decline dental treatment which they perceive as expensive.
What is marginal leakage of amalgam restorations?
Marginal leakage is the penetration of fluids, bacteria and ions into the space existing between all restorative materials and cavity walls. It can cause pulp irritation, colour changes in the tooth and secondary caries, and may result in failure of the restoration.
What is percolation in dentistry?
Percolation is when changes in temperature cause fillings to suck in and push out liquid. When your teeth are exposed to cold temperatures (such as when you eat ice cream or drink a beverage with ice in it), the materials contract.
What is Nanoleakage?
The term “nanoleakage” was introduced to describe a specific type of leakage within the dentin margins of restorations. Nanoleakage appears as a consequence of the acid etching procedure allowing the penetration of oral and pulpal liquids such as acids into porosities within or adjacent to the hybrid layer.
What is dental polymerization?
Polymer—Chemical compound consisting of a large organic molecule (“macromolecule”) formed by the union of many smaller repeating units (mers). Polymerization—Chemical reaction in which monomers of a low molecular weight are converted into chains of polymers with a high molecular weight.