Does Pigment Incorporation into Regular Composite Resins for Posterior Buildups Alter Their Bond Strength?

Flaviana Alves Dias,Sandrine Bittencourt Berger,Ricardo Danil Guiraldo,Eloisa Aparecida Carlesse Paloco,Omar Geha,Maria Verônica Rodrigues Conto,Thais Maria Freire Fernandes

doi:10.1590/0103-6440202003332

Flaviana Alves Dias, Sandrine Bittencourt Berger + Show 5 more

Open Access

https://doi.org/10.1590/0103-6440202003332

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Abstract

Posterior build-ups are auxiliary devices to orthodontic treatment which are made with resin-based or glass ionomer composites. Their removal requires care to protect the tooth surface, therefore, pigmented materials are preferred for a better visualization. This study proposed a pigmentation experimental technique of a regular composite resin, evaluating the microshear bond strength test (µ-SBT) of this experimental pigmented resin and comparing with a blue-colored polyacid-modified composite resin, used for posterior buildups. Forty-eight buccal and lingual surfaces of human teeth were used and randomly divided into 4 groups (n=12). The groups were divided into: C (control), regular composite resin; P, regular composite resin pigmented; UBL, Ultra Band Lok™; OB, Ortho Bite™. The composites were bonded using a matrix to obtain microcylinders and prepared for each experimental groups. The samples were then stored in distilled water for 24h at 37°C followed by a µ-SBT. The types of bond failures were evaluated using a stereoscopic magnifying glass (10×). The data were analyzed by ANOVA with Fisher post hoc and Dunnett´s test. Means of µ-SBT± standard deviation (MPa) were: C (39.98a±13.0), P (40.09a± 14.3); UBL (33.26ab±8.6); OB (28.70b±5.5). The most prevalent type of failure was adhesive (80.4%). Further, was not observed a statistically significant correlation between the bond strength values and failure patterns. The pigmentation of a commercially available resin did not alter the µ-SBT and exhibited similar adhesiveness as a polyacid-modified composite resin.

Highlights

Advances in adhesive technology influence the development of techniques that facilitate orthodontic clinical routines [1,2]
Posterior build-ups are an important resource to posterior disocclusion, often used in orthodontics, which allow immediate bonding of orthodontic devices, even in patients with deep overbite [3], assist in dental arch leveling, cause rotation of the occlusal plane, with extrusion of maxillary incisors, intrusion of molars, closure of anterior open bite [4,5], when indicated at the appropriate time [5,6] and they depends just the bitting force of the patient
Regular composite resins can be used to make the build-ups, but during their removal it is difficult to distinguish the enamel from the resin [7], changing the enamel surface increasing its susceptibility to demineralization and dental caries [8,9]

Summary

Introduction

Advances in adhesive technology influence the development of techniques that facilitate orthodontic clinical routines [1,2]. Regular composite resins can be used to make the build-ups, but during their removal it is difficult to distinguish the enamel from the resin [7], changing the enamel surface increasing its susceptibility to demineralization and dental caries [8,9]. The polyacid-modified composite resins, combine the characteristics of two of their components: composite resin and glass ionomer [10]. They are sold as a single paste, which is light-cured, with particles of glass load and monomers, such as Bis-GMA and UDMA in the organic matrix, containing about 20 to 50% of resin [10]. The polymerization reaction of the main material is through light activation, with the limited and delayed acid-base reaction, which is typical of ionomeric-based products, after water absorption in the buccal environment [10]

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