title: Shear bond strength comparison of moisture-insensitive primer and self-etching primer.
abstract: BACKGROUND
  The detrimental effect of moisture on orthodontic bonding has long been known. Hydrophilic bonding materials have been introduced suggesting the possibility of obtaining successful orthodontic bonding to a moisture contaminated enamel surface.
  
  
  OBJECTIVE
  This study has been performed with an aim to compare the in vitro shear bond strength (SBS) and debonding characteristic of moisture-insensitive primer (MIP) (Transbond MIP) (3M Unitek, South Peck Road, Monrovia, California, USA) and self-etching primer (SEP) (Transbond Plus SEP) (3M Unitek, South Peck Road, Monrovia, California, USA) in combination with a color changing adhesive system (Transbond Plus Color Change) (3M Unitek, South Peck Road, Monrovia, California, USA) under both dry and contaminated condition.
  
  
  METHODS
  Randomized controlled clinical study.
  
  
  METHODS
  One hundred and twenty freshly extracted teeth for the purpose of orthodontic treatment were collected. Teeth were randomly assigned into four groups, each consisting of 30 specimen and stainless steel brackets were bonded using each primer-adhesive combination under different enamel conditions, that is, dry and enamel contaminated with natural saliva. SBS and adhesive remnant index were calculated for each group.
  
  
  RESULTS
  Analysis of variance of SBS for both MIP and SEP under dry and contaminated condition showed no statistical significance (P = 0.5). Chi-square test showed significant difference in debonding characteristics among the test groups (P < 0.001). All the groups showed typical debonding characteristics of separation either at the bracket-adhesive interface or within the adhesive itself.
  
  
  CONCLUSIONS
  Moisture contamination did not affect the SBS and adhesive remaining on tooth for both MIP and SEP.
authors.affiliation: Department of Orthodontics and Dentofacial Orthopaedics, Regional Dental College, Guwahati, Assam, India.
authors.forename: Arunima
authors.initials: A
authors.lastname: Goswami
authors.affiliation: Department of Orthodontics and Dentofacial Orthopaedics, Regional Dental College, Guwahati, Assam, India.
authors.forename: Borah
authors.initials: B
authors.lastname: Mitali
authors.affiliation: Department of Orthodontics and Dentofacial Orthopaedics, Regional Dental College, Guwahati, Assam, India.
authors.forename: Bk
authors.initials: B
authors.lastname: Roy
keywords: Moisture contamination; moisture-insensitive primer; orthodontic bonding; self-etching primer