title: The effect of IDS (immediate dentin sealing) on dentin bond strength under various thermocycling periods.
abstract: OBJECTIVE
  The purpose of this study was to find out the effect of immediate dentin sealing (IDS) on bond strength of ceramic restoration under various thermocycling periods with DBA (dentin bonding agent system).
  
  
  METHODS
  Fifty freshly extracted human mandibular third molars were divided into 5 groups (1 control and 4 experimental groups) of 10 teeth. We removed enamel layer of sound teeth and embedded them which will proceed to be IDS, using All Bond II. A thermocycling was applied to experimental groups for 1, 2, 7, 14 days respectively and was not applied to control group. IPS Empress II for ceramic was acid-etched with ceramic etchant (9.5% HF) and silane was applied. Each ceramic disc was bonded to specimens with Duo-link, dual curable resin cement by means of light curing for 100 seconds. After the cementation procedures, shear bond strength measurement and SEM analysis of the fractured surface were done. The data were analyzed with a one-way ANOVA and Tukey multiple comparison test (α=.05).
  
  
  RESULTS
  There were no statistically significant differences between 4 experimental groups and control group, however the mean value started to decrease in group 7d, and group 14d showed the lowest mean bond strength in all groups. Also, group 7d and 14d showed distinct exposed dentin and collapsed hybrid layer was observed in SEM analysis.
  
  
  CONCLUSIONS
  In the present study, it can be concluded that ceramic restorations like a laminate veneer restoration should be bonded using resin cement within one week after IDS procedure.
authors.affiliation: Department of Biomaterials & Prosthodontics, Kyung Hee University Hospital at Gangdong, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea.
authors.forename: Richard
authors.initials: R
authors.lastname: Leesungbok
authors.affiliation: Department of Prosthodontics, Graduate School of Dentistry, Kyung Hee University, Seoul, Republic of Korea.
authors.forename: Sang-Min
authors.initials: SM
authors.lastname: Lee
authors.affiliation: Department of Biomaterials & Prosthodontics, Kyung Hee University Hospital at Gangdong, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea.
authors.forename: Su-Jung
authors.initials: SJ
authors.lastname: Park
authors.affiliation: Department of Biomaterials & Prosthodontics, Kyung Hee University Hospital at Gangdong, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea.
authors.forename: Suk-Won
authors.initials: SW
authors.lastname: Lee
authors.affiliation: Department of Prosthodontics, Graduate School of Dentistry, Kyung Hee University, Seoul, Republic of Korea.
authors.forename: Do Yun
authors.initials: DY
authors.lastname: Lee
authors.affiliation: Department of Prosthodontics, Graduate School of Dentistry, Kyung Hee University, Seoul, Republic of Korea.
authors.forename: Byung-Jin
authors.initials: BJ
authors.lastname: Im
authors.affiliation: Department of Biomaterials & Prosthodontics, Kyung Hee University Hospital at Gangdong, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea.
authors.forename: Su-Jin
authors.initials: SJ
authors.lastname: Ahn
keywords: Ceramic restoration; Dentin bonding; Immediate dentin sealing; SEM analysis; Thermocycling