Comparing the tensile strength of brackets adhered to laser-etched enamel vs. acid-etched enamel

Article Abstract:

Metal orthodontic brackets form a much stronger tensile bond to teeth which have been etched with acid than those etched with a laser. Forty extracted upper incisors of cattle were divided into two groups. Each tooth in group A was exposed to 37% liquid phosphoric acid for 15 seconds. A neodymium:yttrium-aluminum-garnet (Nd:YAG) laser etched each of the Group B teeth for eight seconds, producing a roughness similar to acid-etching. Orthodontic brackets were bonded to the teeth. The average Nd:YAG laser bond strength was about half that of the acid-etched bond. Laser etching should not be used when high forces are expected.

Testing, Dental bonding, Lasers in dentistry, Laser dentistry, Orthodontic appliances, Dental acid etching

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Sex, enamel and forensic dentistry: a search for identity

Article Abstract:

The sex of a person can be easily identified from DNA analysis of the AMEL gene in bones or teeth. Mitochondrial DNA (MtDNA) can be used to accurately establish family relationships, even over many generations. The remains of the Romanov family, last czars of Russia, were positively identified by comparing the MtDNA of bones found in a grave to that of Prince Philip, Duke of Edinburgh, who was related to them through Queen Victoria's daughter, Alice. This technique has also proved effective in identifying plane crash victims.

DNA testing, DNA identification, Identification and classification, Mitochondrial DNA, Disaster victims

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Enamel microabrasion: observations after 10 years

Article Abstract:

Enamel microabrasion is an effective technique for removing superficial tooth discoloration. It involves removing small bits of enamel using a paste containing mild hydrochloric acid and silicon carbide particles. The paste is applied with a small diamond bur on a drill. Most discoloration can be removed in 5 minutes and can be followed by peroxide bleaching if necessary. In most cases, the treatment is permanent. The technique has been used since the mid-1980s.

Care and treatment, Teeth, Tooth bleaching, Abrasives, Enamel, Dental, Dental enamel

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