How erosive drinks and enzyme inhibitors impact bond strength to dentin

Abstract

Concern has been raised about the bonding of restorative procedures to an erosive lesion, given the change in organic and inorganic composition and structure of this substrate. This in vitro study evaluated the effect of erosive drinks and an enzyme inhibitor (2% chlorhexidine digluconate - 2% CHX) on bond strength to dentin. Sixty sound human third molars were selected, and the occlusal enamel was flattened, exposing the dentin surface. The specimens were randomly divided into three groups: AS-Artificial saliva (control group), RC- Regular Cola and ZC- Zero Cola. Twenty specimens were immersed in their respective solution for 1 minute, 3 times a day, over the course of 5 days. After acid etching and before bonding with Adper Single Bond 2, half of the samples of each group (n = 10) were treated with 2% CHX, whereas the other half (n = 10) were not, forming the control group (CONV). All the specimens were restored with Filtek Z250 composite resin filled in Tygon tubes (0.48 mm2), yielding six microcylinders for microshear bond strength testing. Three composite resin microcylinders of each specimen were tested after 1 month, and the remaining microcylinders were tested after 6 months. Failure modes were determined using a stereomicroscope (40x). The data were statistically analyzed by three-way ANOVA and Tukey tests (α = 0.05). Overall bonding was reduced after 6 months, regardless of treatment. The 2% CHX enhanced bond strength after 1 month only in the ZC group, and did not enhance bonding performance to demineralized dentin by erosive protocol after 6 months in any group.

Long-Term Bond Strength of Two Benzalkonium Chloride-Modified Adhesive Systems to Eroded Dentin

“…The fact that Adper Scotchbond 1XT yielded higher bond strength to eroded dentin than did OptiBond FL seems to reflect a superior capacity of the Adper Scotchbond 1XT adhesive to infiltrate thick demineralization zones and to effectively polymerize in humid conditions. The relatively good performance on eroded dentin is corroborated by studies on its predecessor Adper Single Bond 2 [ 37 , 38 ].…”

Effect of Dentin Conditioning and Erosive Coca Cola Challenge on the Micro-shear Bond Strength and SEM Evaluation of Resin-Modified Glass-Ionomer Cement- in vitro study

“…34 Several studies have been conducted to evaluate the erosive effects of different factors on the surface topography, chemical composition and behavior of direct and indirect restorative materials. [27][28][29][30][31][34][35][36][37][38] Several studies were conducted to evaluate the role of pH cycles on the validity of bond strength of resin composite restorations [39][40][41] , bond strength of restorations to eroded enamel and dentin 42,43 , but no or little information are available about the effect of pH cycling on the bonding of RMGICs to dentin. 44 From the previous information a study designed to evaluate the role of an erosive beverage, Coca cola, on the micro-shear bond strength of nano-fill resin modified glass-ionomer cement to dentin, after different conditioning protocol, may be of interest.…”

Influence of Remineralizing Dentifrice in the Treatment of Erosive Enamel Lesions

“…This leads to a progressive softening of the tooth surface with subsequent irreversible loss of dental hard tissue. Dental erosion affects mainly the enamel but can also cause hypersensitivity if it reaches the dentin, or in severe cases, exposure the pulp or even tooth fracture 2 .…”

“…It is believed that the erosive power of acidic drinks a involves several factors, which can lead to dental erosion. Changes in pH, buffering capacity, type of acid, frequency of exposure, duration of each episode of erosive exposure, chelating properties and content of calcium and phosphate, are the most common factors 2 . Clinical manifestations, such as superficial lesions on smooth surfaces and bulging and flattening of cuspids can develop even in the initial stages, which may lead to exposure of the coronal dentine.…”