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قوة الدفع الرابطة الى الخارج والتسرب القمي للمواد (MTA Plus, Biodentine and Bioceramic) بتقنية حشوة ثلث القمي للجذر : دراسة مختبرية == Push - Out Bond Strength And Apical Microleakage of (Mta Plus, Biodentine, And Bioceramic)As Apical Third Filling (An In Vitro Study)
Author name:
عبير علي عباس
Supervisor name:
جمال عزيز مهدي
General topic:
Dentistry
Specific topic:
Dental Treatment
Degree:
Master
University:
Mustansiriyah University
Language:
English
University location:
Baghdad
First pages:
20T396 - p.pdf
Abstract:
اجريت هده الدراسة المختبرية لتقيم قدرة ختم لثلاث مواد استعملت ( بتقنة حشوة ثلث القمي لقناة الجذر ) باستعمال اختبار قوة الربط الدفع الى الخارج ودراسة التسرب القمي.ستين جذر حلقي الاسنان العلوية ذو قناة مستقيمة ذات فتحة قمية مكتملة التكوين مختارة بعناية وفق | This study was conducted to evaluate the sealing ability of three materials used as apical third filling by using push - out bond strength test and apical microleakage study.Sixty straight palatal roots of freshly extracted maxillary first molars were selected. All teeth had mature apices, selected carefully according to specific criteria. The roots were instrumented using crown down technique with rotary Protaper universal system, instrumentation were done with 5ml of 2.5% sodium hypochlorite used as irrigation between files, 17% buffered solution of EDTA was used as final irrigant followed by 2.5% sodium hypochlorite then 10ml distilled water to remove any remnant of irrigant. Roots were randomly divided into three groups according to the filling materials used ( twenty roots for each group) : Group (1) : MTA Plus ( 4mm thickness) using as apical third filling. Group (2) : Biodentine (4mm thickness) using as apical third filling.Group (3) : Bioceramic root repair material (4mm thickness) using as apical third filling.Easy and Quick (E&Q) obturation system were used to complete obturation of roots. After incubation period at 37 °C for three days. Ten roots from each group were used for push - out test, after root were embedded in clear acrylic resin, sectioned at apical level in 2mm and 4mm from root apex to provide slice 2mm in thickness. The bond strength was measured using computerized universal testing machine, each section fixed in the machine so that the load applied from apical to coronal direction at 0.5mm/min speed and the computer drew curve to show the higher bond force before dislodgment of the filling material. These force were divided by surface area to obtain the bond strength in MPa.After debonding each sample was examined under Stereomicroscope and the type of failure mode was recorded. The result showed non significant different between Biodentine group and MTA Plus group. Biodentine group showed a very high significant difference with Bioceramic material group. Also high significant difference between MTA Plus group and Bioceramic material group. The Biodentine group showed highest mean of bond strength in comparison to other test group.Ten roots remain from each group used for apical microleakage study. The roots submerged in 2% methylene blue for three days. The roots were cleared and the degree of linear dye penetration was measured in millimeter by stereomicroscope under 40 X magnification with calibrated scale ocular grid. The result showed the Biodentine group lowest mean of microleakage than other group while Bioceramic material group showed high mean of microleakage than other groups. There are no significant difference among groups. There is positive correlation between push - out bond strength and an apical dye penetration in microleakage for each group of material.
