Can Extended Photoactivation Time of Resin-based Fissure Sealer Materials Improve Ultimate Tensile Strength and Decrease Water Sorption/solubility?

Overview

Journal Eur J Dent

Publisher Thieme

Specialty Dentistry

Date 2012 Oct 19

PMID 23077420

Authors

Boniek Castillo Dutra Borges

Eduardo Jose Souza-Junior

Anderson Catelan

Luis Alexandre Maffei Sartini Paulillo

Flavio Henrique Baggio Aguiar

Affiliations

Soon will be listed here.

Abstract

Objective: This study aimed to evaluate the impact of extended photoactivation time on ultimate tensile strength (UTS), water sorption (WS) and solubility (WSB) of resin-based materials used as fissure-sealants.

Methods: A fissure-sealant (Fluroshield) and a flowable composite (Permaflo) polymerized for 20 and 60 seconds were tested. For UTS, 20 hourglass shaped samples were prepared representing two materials and two photoactivation time (n=5). After 24-h dry-storage, samples were tested in tension using a universal testing machine at a cross-head speed of 0.5 mm/min (UTS was calculated in MPa). For WS and WSB, 20 disks with 5 mm diameter and 1 mm height (n=5) were prepared and volumes were calculated (mm(3)). They were transferred to desiccators until a constant mass was obtained (m1) and were subsequently immersed in distilled water until no alteration in mass was detected (m2). Samples were reconditioned to constant mass in desiccators (m3). WS and WSB were determined using the equations m2-m3/V and m1-m3/V, respectively. Data were subjected to two-way ANOVA and Tukey's HSD test (P<.05).

Results: There was no significant difference between materials or photoactivation times for the UTS and WS. Permaflo presented lower but negative WSB compared to Fluroshield.

Conclusions: Extended photoactivation time did not improve the physical properties tested. Fluroshield presented physical properties that were similar to or better than Permaflo.

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