Effect of a nonrinse conditioner on the durability of a polyacid-modified resin composite fissure sealant

Resident’s Name: Chad Abby Date: 3/6/2009

Article title: Effect of a Nonrinse Conditioner on the Durability of a Polyacid-modified Resin Composite Fissure Sealant

Author(s): Ewa Lampa DDS, Anna Brechter DDS, Jan W. V. van Dijken DDS

Journal: Journal of Dentistry for Children

Volume (number): 71:2

Month, Year: 2004

Major topic: Sealants

Minor topic(s: effect of a nonrinse conditioner on sealants

Type of Article: clinical study

Main Purpose: The purpose of this study was to evaluate the effect of the simplified conditioning on durability of polyacid-modified resin composite fissure sealants

Overview of method of research: A split mouth design was used placing fissure sealants on caries free first and second molars. One molar was randomly assigned to receive a Polyacid-Modified Resin Composite (PMRC) sealant, while the opposite molar received a resin sealant. 92 teeth were treated – the occlusal surface of the PMRC fissure sealant tooth was pretreated with the nonrinse conditioner and one coat of the primer Prime & Bond NT, which is a self-etching primer. The contralateral tooth was then conditioned with phosphoric acid and sealed with Delton sealant. The sealant was then evaluated during a two year period. In addition 49 pairs were sealed with Prime & Bond NT/PMRC after conditioning with 36% phosphoric acid and evaluated after one year.

Findings: A nonrinse conditioner reduces the risk of inadvertent contamination of the tooth tissue by eliminating the necessity of acid etching, rinsing with water and the change of cotton rolls. Instead no water rinsing is performed but a subsequent application of a separate adhesive is necessary. PMRC was developed as a direct esthetic restorative material with desirable properties of resin composites and those of fluoride-releasing glass ionomer cement. Advantages of the PMRC sealants compared to traditional resin fissure sealants include its low stress developed during polymerization, lower E-modulus, and fluoride release from the material.

Key points/Summary : Significantly higher loss rates at 1 and 2 years were observed for the nonrinse conditioner/Prime & Bond NT/ PMRC sealants. At 2 years, partial and total loss rates for Delton sealant were 23% and 11%, and for the nonrinse conditioner/ Prime & Bond NT/ PMRC sealants were 44% and 40% respectively. At one year, phosphoric acid-conditioned Prime & Bond NT/ PMRC sealants showed significantly better retention than the nonrinse conditioned PMRC sealants and the phosphoric acid-conditioned Delton sealants. Results from the study show that conditioning with nonrinse conditioner prior to sealant application cannot be recommended.



Assessment of article: Newer products now may show different results – would be an interesting study to do again.