Comparison of effect of desensitizing agents on the retention of crowns cemented with luting agents: anin vitrostudy

Abstract

PURPOSE.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. MATERIALS AND 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 oneway 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). CONCLUSION. 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. Dentistry, Dr. D.Y. Patil Dental College & Hospital, Pimpri, Pune-18, India Tel. 91 997 0744140: e-mail, shitalsonune@yahoo.com Received September 22, 2011 / Last Revison June 28, 2012 / Accepted July 5, 2012 http://dx.doi.org/10. 4047/jap.2012.4.3.127 ORIGINAL ARTICLE J Adv Prosthodont 2012;4:127-33The geometric form of the prepared tooth and the casting mainly determines the retention of the prosthesis, but the clinical success of the restoration also depends on the integrity and the mode of attachment of the intervening cement layer. 6 The various cementing media ranging from the traditional ones like zinc phosphate cement to the newer resin-based luting cements have different modes of attachment to the casting and the tooth surface. A myriad of combinations of desensitizers and luting cements are available today to the dental clinician. The available literature offers inconsistent statistics on the effect when using various desensitizing agents with luting cements like zinc phosphate, glass ionomer and resin-modified glass ionomer.The purpose of this study was to evaluate the effect of two commercially available desensitizing agents, GC tooth Mousse and GLUMA � Desensitizer, on the retentive ability of three luting agents namely zinc phosphate, glass ionomer an...

Effect of GLUMA desensitizer on the retention of full metal crowns cemented with Rely X U200 self-adhesive cement

“…The teeth were immersed in 0.1% thymol solution for 48 hours for disinfection. The soft tissue residues were also removed 5. The teeth were then prepared as follows:…”

“…1). For axial and occlusal reductions, a round-end taper diamond bur (Dia-Burs, Mani Inc. Tochigi, Japan) was used 5. Standard tooth cylinders with 6° taper were obtained as such.…”

“…Defective crowns were replaced. Metal crowns were finished by metal finishing stones and burs and sandblasted using 50 µm aluminum oxide particles (AX-B5; Twin-Pen sandblaster, Titanjin Aixin medical equipment co. Ltd., Tianjin, China) 5. They were then cleaned using an ultrasonic bath (Transonic 470/H, Elma, Singen, Germany) for 60 seconds 5…”

“…In the case group, GLUMA desensitizer (Heraeus Kulzer, Germany) was applied to the tooth surfaces for 30 to 60 seconds as recommended by the manufacturer 5. Compressed air was sprayed on the surface until the surface was no longer shiny.…”

“…Sailer et al,6 in 2012, reported that application of GLUMA desensitizer enhanced the shear bond strength of cement. However, Jalandar et al,5 in 2012, reported that GLUMA desensitizer had no significant effect on the retention of crowns. Considering the existing controversies, this study aimed to assess the effect of GLUMA desensitizer on the retention of full crowns cemented using RelyX U200.…”