title: The effect of bur preparation on the surface roughness and reline bond strength of urethane dimethacrylate denture base resin.
abstract: BACKGROUND
  The clinical success of relining depends on the ability of reline resin to bond to denture base. Surface preparations may influence reline bond strength of urethane-based dimethacrylate denture base resin.
  
  
  OBJECTIVE
  To investigate the effect of bur preparation on the surface roughness (R a ) of eclipse denture base resin and its shear bond strength (SBS) to an intra-oral self-curing reline material. The mode of reline bonding failure was also examined.
  
  
  METHODS
  Twenty-four cylindrical Eclipse™ specimens were prepared and separated into three groups of eight specimens each. Two groups were subjected to mechanical preparation using standard and fine tungsten carbide (TC) burs and the third group (control) was left unprepared. The R a of all specimens was measured using a contact stylus profilometer. Subsequently, relining was done on the prepared surface and SBS testing was carried out a day later using a universal testing machine.
  
  
  RESULTS
  One-way ANOVA revealed significant differences (P<0.05) in R a and SBS values for all the groups. Post-hoc Tukey's HSD test showed significant differences (P<0.05) between all the groups in the R a values. For SBS also there were significant differences (P<0.05), except between standard bur and control.
  
  
  CONCLUSIONS
  1) There was a statistically significant difference in the R a of Eclipse™ specimens prepared using different carbide burs (P<0.05). 2) There was a statistically significant difference in the relined SBS (P<0.05) when prepared using different burs, but the difference between the standard bur and the control group was not statistically significant.
authors: Department of Prosthetic Dentistry, University of Malaya, Kuala Lumpur, Malaysia. drmrbaig@yahoo.com
authors: Mirza Rustum
authors: MR
authors: Baig
authors: Fazrina T M
authors: FT
authors: Ariff
authors: Norsiah
authors: N
authors: Yunus
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003764:Dental Materials / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000295:instrumentation; D003819:Denture Bases; D003823:Denture Rebasing / Q000295:instrumentation*; D004867:Equipment Design; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D011140:Polyurethanes / Q000737:chemistry*; D033081:Shear Strength; D013314:Stress, Mechanical; D013499:Surface Properties; D017973:Tungsten Compounds / Q000737:chemistry
chemical_list: D000180:Acrylic Resins; D003188:Composite Resins; D003764:Dental Materials; C509237:Eclipse Prosthodontic Resin; D008689:Methacrylates; D011140:Polyurethanes; D017973:Tungsten Compounds; C103363:kooliner; C002802:tungsten carbide; C029824:urethane dimethacrylate luting resin