Antimicrobial properties of an orthodontic adhesive combined with cetylpyridinium chloride.

Introduction: Patients undergoing fixed appliance treatment are at greater risk for increases in salivary and plaque levels of Streptococcus mutans and an elevated risk of dental caries. Cetylpyridinium chloride (CPC) is known to be an effective antiplaque agent. The purpose of this study was to investigate whether incorporating CPC into a commercially available orthodontic adhesive would impart antimicrobial properties without altering the diametral tensile strength of the material.

Evaluation of antimicrobial properties of orthodontic composite resins combined with benzalkonium chloride.

An antimicrobial agent, benzalkonium chloride (BAC), was added to a chemically cured composite resin, and the antimicrobial benefits and physical properties of the modified composite were evaluated. BAC was added to Reliance Phase II composite to create modified composites with BAC concentrations ranging from 0.25 to 2.

[Trends in orthodontic biomaterials: metals and ceramics].

While the beginning of orthodontics was marked by an acute scarcity in materials, the modern clinician has to face a large array of devices made of metals, plastics, ceramics and combinations thereof. Each of these materials have been developed for other purposes than orthodontics, and then transplanted "as is" in a field which has its own demands. During the years, theses devices, as well as the materials these are made of, have been modified most of time to the benefit of both the patient and the clinician, and some time to that of the manufacturer who has tried to save, or bypass limiting patients.

Impact resistance of ceramic brackets according to ophthalmic lenses standards.

The overall resistance to accidental blows of the many ceramic brackets that are sold today has not been explored. Facing a similar diversity, the eyeglasses industry has chosen to standardize the testing of lenses by subjecting them to the drop of a steel ball. By slightly modifying this test, 10 brands of ceramic brackets were examined.

Metal strength of direct bonding brackets.

Because the strength of direct bonding brackets is both important and difficult to measure, a related property, microhardness, has been investigated. Twelve popular U.S.

Bracket angulation as a function of its length in the canine distal movement.

The slot angulations that are built into currently manufactured brackets are the same as those recommended more than 20 years ago. Because of a continuous trend toward miniaturization, the bracket slot length has diminished considerably, fact that should have had an impact on the characteristics of the slot. This impact has not yet taken place.

Microbial attack of orthodontic adhesives.

Composites used as orthodontic direct bonding adhesives have a polymeric matrix that can host and nurture a variety of aerobic and anaerobic microorganisms acting alone or in combination (consortia). Their accumulation can lead to the weakening of the bond and possibly the attacking of the tooth. A number of microorganisms have been identified as present on the removed direct bonding brackets.

Adhesion and its ten commandments.

Despite the fact that retention has been widely discussed in many specialty papers, there is still a lack of information regarding it. The author of the following article happens to have been both a designer or orthodontic adhesives for a major manufacturer and a principal scientist of a Fortune 200 company (in charge of adhesion projects like the substitution of riveting through bonding for airplanes and advanced composites metal/plastics). Based upon his experience, he's trying to relate knowledge which is common in the bonding industry to the needs of the orthodontist.