title: Effect of Dental Chair Light on Enamel Bonding of Orthodontic Brackets Using Light Cure Based Adhesive System: An In-Vitro Study.
abstract: OBJECTIVE
  The aim of this in vitro study was to evaluate the influence of the Dental chair light on the bond strength of light cured composite resin.
  
  
  METHODS
  Sixty therapeutically extracted human premolar teeth were randomly allocated to two groups of 30 specimens each. In both groups light cured composite resin (Transbond XT) and MBT premolar metal brackets (3M Unitek) was used to bond brackets. In group I and II light curing was done using Light-emitting diode light curing units without and with the dental chair light respectively. After bonding, all samples were stored in distilled water at room temperature for 24 hours and subsequently tested for shear bond strength and Adhesive Remnant Index (ARI) scores. Data was subjected to Mann Whitney U statistical test.
  
  
  RESULTS
  Results indicated that there was significantly higher shear bond strength (7.71 ± 1.90) for the Group II (composite cured with LED and dental chair light) compared with Group I (composite cured with LED LCU only) (5.74 ± 1.13).the obtained difference was statistically significant. There was no statistical significant difference between ARI scores in between the groups.
  
  
  CONCLUSIONS
  light cure bonding with dental chair light switched on will produce greater bond strength than the conventional bonding. However, the ARI score were similar to both the groups. It is advised that the inexperienced orthodontist should always switch off the dental chair light while bonding for enough working time during the bracket placement.
authors.affiliation: Department of Orthodontics and Dentofacial Orthopedics, Hitkarini Dental College and Hospital, Jabalpur, MP, India.
authors.forename: Anil
authors.initials: A
authors.lastname: Tiwari
authors.affiliation: Department of Orthodontics and Dentofacial Orthopedics, Hitkarini Dental College and Hospital, Jabalpur, MP, India.
authors.forename: Tarulatha
authors.initials: T
authors.lastname: Shyagali
authors.affiliation: Department of Orthodontics and Dentofacial Orthopedics, Hitkarini Dental College and Hospital, Jabalpur, MP, India.
authors.forename: Sarvraj
authors.initials: S
authors.lastname: Kohli
authors.affiliation: Department of Orthodontics and Dentofacial Orthopedics, Hitkarini Dental College and Hospital, Jabalpur, MP, India.
authors.forename: Rishi
authors.initials: R
authors.lastname: Joshi
authors.affiliation: Department of Orthodontics and Dentofacial Orthopedics, Hitkarini Dental College and Hospital, Jabalpur, MP, India.
authors.forename: Abhishek
authors.initials: A
authors.lastname: Gupta
authors.affiliation: Department of Orthodontics and Dentofacial Orthopedics, Hitkarini Dental College and Hospital, Jabalpur, MP, India.
authors.forename: Rana
authors.initials: R
authors.lastname: Tiwari
keywords: ARI score; composite resin; dental chair light; shear bond strength