title: Comparison of effect of desensitizing agents on the retention of crowns cemented with luting agents: an in vitro study.
abstract: OBJECTIVE
  Many dentists use desensitizing agents to prevent hypersensitivity. This study compared and evaluated the effect of two desensitizing agents on the retention of cast crowns when cemented with various luting agents.
  
  
  METHODS
  Ninety freshly extracted human molars were prepared with flat occlusal surface, 6 degree taper and approximately 4 mm axial length. The prepared specimens were divided into 3 groups and each group is further divided into 3 subgroups. Desensitizing agents used were GC Tooth Mousse and GLUMA® desensitizer. Cementing agents used were zinc phosphate, glass ionomer and resin modified glass ionomer cement. Individual crowns with loop were made from base metal alloy. Desensitizing agents were applied before cementation of crowns except for control group. Under tensional force the crowns were removed using an automated universal testing machine. Statistical analysis included one-way ANOVA followed by Turkey-Kramer post hoc test at a preset alpha of 0.05.
  
  
  RESULTS
  Resin modified glass ionomer cement exhibited the highest retentive strength and all dentin treatments resulted in significantly different retentive values (In Kg.): GLUMA (49.02 ± 3.32) > Control (48.61 ± 3.54) > Tooth mousse (48.34 ± 2.94). Retentive strength for glass ionomer cement were GLUMA (41.14 ± 2.42) > Tooth mousse (40.32 ± 3.89) > Control (39.09 ± 2.80). For zinc phosphate cement the retentive strength were lowest GLUMA (27.92 ± 3.20) > Control (27.69 ± 3.39) > Tooth mousse (25.27 ± 4.60).
  
  
  CONCLUSIONS
  The use of GLUMA® desensitizer has no effect on crown retention. GC Tooth Mousse does not affect the retentive ability of glass ionomer and resin modified glass ionomer cement, but it decreases the retentive ability of zinc phosphate cement.
authors.affiliation: Department of Prosthetic Dentistry, Dr. D.Y. Patil Dental College & Hospital, Pimpri, India.
authors.forename: Sonune Shital
authors.initials: SS
authors.lastname: Jalandar
authors.forename: Dange Shankar
authors.initials: DS
authors.lastname: Pandharinath
authors.forename: Khalikar
authors.initials: K
authors.lastname: Arun
authors.forename: Vaidya
authors.initials: V
authors.lastname: Smita