Influence of Thermal Cycling on Dentin Bond Strengths of Single-step Self-etch Adhesive Systems

Abstract

Some of the bonding systems used in this study have achieved unchanged dentin bond strengths after thermal cycling. Therefore, by choosing appropriate adhesive systems, the simplified clinical procedures offered by single-step self-etch systems can be exploited even after thermal cycle stress. SUMMARYThis study investigated the influence of thermal cycling on the dentin bond strengths of singlestep self-etch adhesive systems. The Absolute, Clearfil Tri-S Bond, G-Bond and One-Up Bond F Plus systems were used. Bovine mandibular incisors were mounted in self-curing resin, and the facial surfaces were wet ground with #600 SiC paper. Adhesives were applied to the prepared dentin surfaces, and they were light irradiated according to each manufacturer's instructions. Resin composites were condensed into a mold (4 mm in diameter and 2 mm in height) and light irradiated for 30 seconds. Bonded specimens were divided into three groups and subjected to different storage conditions as follows: 37°C water for 24 hours; 37°C water for 24 hours followed by 10,000 thermal cycles between 5°C and 60°C or 37°C water for 24 hours followed by 20,000 thermal cycles between 5°C and 60°C. Ten samples per group were tested in a shear mode at a crosshead speed of 1.0 mm/minute. Analysis of variance and Tukey's HSD test at the 0.05 significance level were used to compare the three storage conditions for each adhesive system. After 24 hours storage in water, the mean dentin bond strengths ranged from 11.4 MPa to 17.1 MPa. The Clearfil Tri-S Bond system showed the highest bond strength. After 10,000 thermal cycles, the mean bond strengths remained unchanged Youhei Asaka, DDS, graduate student,

Effects of One-year Storage in Water on Bond Strength of Self-etching Adhesives to Enamel and Dentin

“…This was a rather unusual result for a bonding system which already exhibited good initial bond strength. In previous studies, at best only a slight increase in bond strength was reported after long-term storage [19][20][21][22] . It has been suggested that loss of minerals from enamel and dentin during in vitro water storage would lead to deterioration of mechanical properties of teeth 31) .…”

“…Susceptibility of resin components to hydrolysis has been identified as a cause for decrease of bond strength. It has been suggested that the outstanding hydrolytic stability of MDP and its additional chemical interaction with enamel and dentin contributed to the long-term durability of dentin and enamel bonding with SE 17,21) and TS 18,22) . MDP has a special molecular structure that enables chemical interaction with residual hydroxyapatite after etching, and the calcium salts formed thereby also exhibit hydrolytic stabiltiy 21) .…”

“…TS, on the other hand, was an all-in-one material that required only one application step. Some researchers have even highly lauded such single-step selfetching systems for their simultaneous monomer penetration and complete impregnation of the collagen network, which then prevents the hydrolysis of collagen fibrils 22) . This is because the formation of a homogenous and void-free interfacial zone improves the quality of the hybrid layer and contributes to long-term sealing of the dentin surface 27) .…”

Evaluation of the Surface Roughness and Microleakage of Dental Composites Exposed to Different Beverages

“…Thermal cycling induces stress and degradation in interface due to the difference between tooth structures and restorative materials. 21 Mechanical load cycling produces stress in the composite resin, and it is transmitted to the bonding interface. Interfaces less affected by microleakage before the aging test were more susceptible to thermal and load cycling.…”

Mi̇krogeri̇li̇m Bağlanma Dayanim Testi̇ Ve Sonuçlarini Etki̇leyen Etkenler

“…17 Bazı çalışmalar, tek aşamalı self-etch sistemlerin termosiklus işleminden etkilenmediğini bildirirken, bazı çalışmalar ise termosiklus işle-minden sonra tek aşamalı self etch sistemlerin bağ-lanma değerlerinin düştüğünü bildirmişlerdir. [116][117][118][119] Adezivin kimyasal yapısına bağlı olarak, 100.000 termosiklus işleminden sonra bile ara yüzde yapısal değişiklikler meydana gelmeyebilir. 120 Lodovici ve arkadaşları, 84 adeziv tabaka kalınlı-ğının, termal ve mekanik uygulamadan sonra bağlan-ma direncini etkileyip etkilemediğini incelemişlerdir.…”