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Shear bond strength ‎of three different ‎bonding agents on ‎three different tooth ‎substrates in ‎different times

Mustafa, Ammar A. and Ibrahim, Maan and Junaidi, termizi and Akhtaruzzaman, Md. (2009) Shear bond strength ‎of three different ‎bonding agents on ‎three different tooth ‎substrates in ‎different times. In: FDI Annual World Dental Congress 2009, 2-5 September 2009, Singapore. (Unpublished)

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Introduction:‎ The importance of high tensile strength in the adhesion of resin materials to enamel, and ‎particularly to dentin, for the creation of well-sealed and long lasting restorations has ‎often been detailed. However, most of these tests are done after a 24 hours or longer ‎periods. These studies though important in indicating the ability of the bonding resin to ‎adhere to tooth substrate; do not discourse the strength immediately after the bonding ‎resin is cured. Early bond strength can be considered very significant because this is the ‎period when high stresses are placed on the bond among the cavity wall, bonding resin ‎and resin composite. If the bond strength is not strong enough during the first hour after ‎cure, it may rupture, causing gap formation. Investigations of the repair of composites ‎have shown that bond strength can be significantly reduced at an interface involving an ‎aged composite Objectives:‎ The aim of this in vitro study was to investigate the early shear bond strength of two ‎bonding systems on three different tooth substrates and compare the results with other ‎test times and then estimate the obtained results by using SEM, AFM and 2D optical ‎analyser to evaluate the significance of these methods.‎ Materials and methods:‎ ‎240 human premolars teeth have been collected for this study. All the specimens’ teeth ‎were free of any carious lesion. Three human tooth substrates were used. The first ‎substrate was clean, unprepared enamel. Relatively flat coronal areas were cleaned with a ‎fluoride free pumice flour slurry and rubber cup for 10 seconds and rinsed for another 10 ‎seconds. No other preparations were performed prior to etching. The second and third ‎substrates were prepared enamel and dentin. These specimens were prepared using a ‎model trimmer with coarse and fine silicon carbide wheels and rinsed for 10 seconds. ‎These specimens were also cleaned with fluoride free pumice flour slurry and rubber cup ‎for 10 seconds and ‎rinsed with an air water syringe for another 10 seconds‎. the ‎embedding moulds used to hold the specimens were made of methylmethacrylate resins. ‎the moulds dimension were 1 inch in height and 1 inch in width. Care was taken to ‎remove any air pocket around the edges of the specimen holes to prevent leakage of the ‎embedding resin. each tooth substrate was positioned within its specimen hole using a ‎small amount of sticky wax, if necessary, to secure uncut specimens. 80 specimens were ‎prepared for the sound enamel in a fact of 20 specimens for each test period, respectivley, ‎one-hour, 24 hours, 7 days and 28 days. 80 specimens were prepared for the prepared ‎enamel and 80 specimens for the dentin in the same distribution as the group for the ‎sound enamel. A cubical specimens of commercial denatl composite were prepared with ‎dimensions of 4 mm. All the test surfaces have been etched with (Actino Etch, 37% ‎Phosphoric Acid Etching Gel, Dental Etchant 1 x 5mL, UK) and then, the composite ‎cubes have attached to the different tooth substrates mounted into the test moulds by the ‎use of test bonding agents.‎ Two bonding agents have been used in the study. 3M ADPER Single Bond 2 adhesives ‎‎(10 %, 5 nm, colloidal filler) (3M, ESPE, USA). OptiBond Solo adhesive system (15 % ‎filled with 0.4 micron barium glass) (Kerr USA). During the storage period, all the ‎specimens were kept in a solution of artificial saliva in a temperature simulating that of ‎human body with an average of 36 °C. and the storage solution was replaced every 1-2 ‎days. The ready specimens were subjected to failure by Schimadzu Precision Universal ‎Tester AG-X series (Schimadzu corp. Japan) with a cross head speed of 0.1 mm/second. ‎After testing the specimens, the they were removed from the moulds and sectioned by ‎the use of IsoMet 5000 (Buehler, USA) and then tested under scan electron microscopy ‎to check for the bonding embeddement of the bonding agent into the dentinal tissues. ‎The same specimens were evaluated under Atomic Force Microscopy AFM (nanoWizard ‎II KPK, Germany) and by 2D optical surface texture analyzer (non-contact type) (Alicon, ‎Austria). The results oobtained by these different methods were compared and analysed.‎ Statistical analysis: A one-way analysis of variance (ANOVA) was used to ‎determine if ‎there were differences between materials bonded to different surfaces. When ‎the ‎ANOVA proved significant Tukey's multiple comparison test was used to determine ‎the nature ‎of the differences. Benferroni was used to confirm significance. ‎ Results:‎ The results shown no significant difference between 1-hour and 24 hours for all groups. ‎The collected results revealed an increase in shear bond strength from 1-hour to 24 hours, ‎‎7 days and 28 days respectively but with no significant difference among these test ‎periods. There was no significan difference between the test groups in spite of the fact ‎that 3M ADPER Single Bond 2 has shown higher numerical values after 24 hours.‎ The estimation of the specimens by the use of different methods revealed that the use of ‎SEM is more reliable that the other mothods used in this study in estimating the hybrid ‎layer and the depth of the polymerised bonding agents into the etched dentin or enamel.‎

Item Type: Conference or Workshop Item (Poster)
Additional Information: 5543/4176
Uncontrolled Keywords: Shear bond strength,‎bonding agents, tooth ‎substrates
Subjects: R Medicine > RK Dentistry
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Dentistry
Depositing User: Assistant prof. Dr. Ammar Mustafa
Date Deposited: 28 Dec 2012 16:22
Last Modified: 28 Dec 2012 16:22
URI: http://irep.iium.edu.my/id/eprint/4176

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