Long-term protective effect of surface sealants against erosive wear by intrinsic and extrinsic acids

Abstract

OBJECTIVE: To test sealants to prevent erosive tooth wear caused by extrinsic and intrinsic acids under long-term exposition. METHODS: 144 bovine enamel samples were randomly allocated to twelve groups (1-12). Samples of groups 1, 5 and 9 remained unsealed (positive controls), 2, 6 and 10 were sealed with Silicon Seal Nano Mix and 3, 7 and 11 with SealProtect. Groups 4, 8 and 12 were sealed with flowable composite (negative controls). Groups 1-4 were immersed in artificial saliva, 5-8 in hydrochloric acid and groups 9-12 in citric acid for 28 days, respectively. After 1, 2, 4, 7, 11, 14, 21 and 28 days, solutions were renewed and enamel wear was quantified by assignation of (32)P in the solutions. RESULTS: In all immersion solutions, lowest mineral loss was observed for the negative controls whilst highest loss was observed for unsealed positive controls. In artificial saliva and citric acid, the loss from samples sealed with SealProtect was not significantly different compared with negative controls whilst loss in groups sealed with Silicon Seal Nano Mix was significantly higher. In hydrochloric acid, loss from samples sealed with SealProtect was not different compared with that of negative controls up to 4 days. Except day 1, the mineral loss in the SealProtect group was significantly lower compared with that of the Silicon Seal Nano Mix group. CONCLUSION: The tested resin based surface sealant is able to significantly reduce the erosive demineralisation of enamel caused by hydrochloric and citric acid even under long-term exposition. Abstract:Objective: To test sealants to prevent erosive tooth wear caused by extrinsic and intrinsic acids under long-term exposition.Methods: 144 bovine enamel samples were randomly allocated to twelve groups (1-12). Samples of groups 1, 5 and 9 remained unsealed (positive controls), 2, 6 and 10 were sealed with Silicon Seal Nano Mix and 3, 7 and 11 with Seal&Protect. Groups 4, 8 and 12 were sealed with flowable composite (negative controls).Groups 1-4 were immersed in artificial saliva, 5-8 in hydrochloric acid and groups 9-12 in citric acid for 28 days, respectively. After 1, 2, 4, 7, 11, 14, 21 and 28 days, solutions were renewed and enamel wear was quantified by assignation of 32 P in the solutions.Results: In all immersion solutions, lowest mineral loss was observed for the negative controls while highest loss was observed for unsealed positive controls.In artificial saliva and citric acid, the loss from samples sealed with Seal&Protect was not significantly different compared with negative controls while loss in groups sealed with Silicon Seal Nano Mix was significantly higher.In hydrochloric acid, loss from samples sealed with Seal&Protect was not different compared with that of negative controls up to 4 days. Except day 1, the mineral loss in the Seal&Protect group was significantly lower compared with that of the Silicon Seal Nano Mix group.Conclusion: The tested resin based surface sealant is able to significantly reduce the erosive demineralisation of ename...

Durability of the anti-erosive effect of surfaces sealants under erosive abrasive conditions

“…The results of studies [36,37] using pepsin admixture to hydrochloric acid for erosion simulation are inconclusive. Therefore, in the present study, the erosive attack was performed with pure hydrochloric acid, as performed in numerous other studies [12,14,19,24,38,39].…”

“…Later, coating of teeth with a resin-based surface sealant showed a significant protective effect against erosive/abrasive tooth wear under in-vivo and in-vitro conditions [22,23]. A recent in-vitro study found a significant reduction of erosive demineralisation by using surface sealants as a coating, even when samples were stored for 4 days in hydrochloric acid or 24 days in citric acid [24]. However, in that study only a demineralisation without an additional abrasive wear regime or remineralisation periods was performed.…”

Effect of erosion and methods for its control on the surface roughness of composite resin

“…However, it is important to state that in other investigations, the resin sealant, when used as a coating, was capable of significantly reducing the enamel demineralization caused by acids and its protective effect seemed to last longer than the protective effect of rinsing solutions [11]. This fact reveals a limitation of the present investigation, since it was impossible to determine if the increase in roughness in the groups covered with resin sealant was the result of alterations in the surface of the material itself or if it was totally or partially removed, exposing the surface of the composite resin to the acids.…”

“…Resin materials are affected by chemical substances in the oral cavity, which interfere with its organic matrix, causing a softening of polymers and consequently, affecting surface properties, such as roughness [8][9][10]. Despite many studies showing the importance of the use of fluorides and mechanical barriers on dental surfaces exposed to erosion [2,5,7,[11][12][13], further analysis is required to study their effects on restorative materials subjected to the same process.…”

Protective Effect of Adhesive Systems associated with Neodymium-doped Yttrium Aluminum Garnet Laser on Enamel Erosive/Abrasive Wear

“…The specimens were then subjected to initial erosion with 0.3% citric acid solution (pH = 2.6) for 5 minutes, to produce a softened layer over the enamel surface, normally found on eroded teeth which need treatment. 23 For that, the samples were identified, placed in silicone holders, and immersed inside the acid solution, over a Kline multifunctional shaker at an average speed of 120 rpm, avoiding the saturation of calcium acid in contact with the sample, which would reduce their activity. The proportion used was 10 mL of citric…”