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Article
Evaluation The Effect Of Addition Some Disinfectants Solutions On Compressive Strength Of Dental Stone

Author: Yasameen Ibrahim Mahbas ياسمين ابراهيم
Journal: Tikrit Journal for Dental Sciences مجلة تكريت لعلوم طب الاسنان ISSN: 20731213 Year: 2015 Volume: 3 Issue: 1 Pages: 39-44
Publisher: Tikrit University جامعة تكريت

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Abstract

It's necessary to disinfectant the stone cast that poured in the impression to reduce the risk of bacteria & microorganism on the dentist technicians and patient .In this study uses the sodium hypochlorite & chlorohyxidine as disinfectants solutions concentration were (5%) .The purpose of this study is to evaluate the effect of addition these disinfectants solutions on compressive strength of dental stone type III .A total number of the study stone specimens were 30 and they were divided in three groups, (10) specimens for each group .The testing groups were prepared and divided into three groups according to the concentrations of sodium hypochlorite (5%) and chlorohyxidine (5%) :-Group A : stone specimens were mixed with distilled water .Group B : stone specimens were mixed with (5%) sodium hypochlorite solution .Group C : stone specimens were mixed with (5%) chlorohyxidine .The size of the specimen is (20mm) diameter and (40mm) length .The shape of specimen is cylinder .The test specimens are measured by (WDW. 200E) .A brass mold in (20mm) diameter and (40mm) length was used to prepare the specimens .The specimens were placed on the testing machine so the top and the bottom of the specimen were in contact with the steel flat rigid plates .The specimens were crushed at a loading rate of (300/50 cm2) and (5mm/min) cross head speed .The maximum load carried by each specimen was taken from a digital screen of the machine and calculation of compressive was obtained .The results for the specimen showed that the addition of different disinfectants caused reduction in strength, which found high significant effect on the compressive strength when compared with control group .

Keywords

Biodentine --- push out --- MTAD --- QMix


Article
The Effect Of Root Canal Irrigants On The Push –out Bond Strength Of Biodentine

Author: Maha M. Yahya مها م يحيى
Journal: Tikrit Journal for Dental Sciences مجلة تكريت لعلوم طب الاسنان ISSN: 20731213 Year: 2015 Volume: 3 Issue: 1 Pages: 69-75
Publisher: Tikrit University جامعة تكريت

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Abstract

The aim of This study was to evaluate the effect of some endodontic irrigants on the push-out bond strength Biodentine in comparison with Mineral trioxide aggregate (MTA) and Glass ionomer cement (GIC).Materials and Methods: Mid root dentine of single rooted teeth was horizontally sectioned into 1-mm-thick slices. The canal space of each dentine slice was enlarged with a diamond bur to 1.4 mm in diameter. The samples were divided into 3 groups (n=21)for each, and the following materials were placed, respectively: Biodentine( Septodont, Saint Maur des Foss'es, France),MTA(Dentsply, TulsaDental, Tulsa, OK),and GIC(Medifil, PROMEDICA, Germany).The samples were wrapped in wet gauze for 30 minutes to ensure setting of the materials and then divided into 3 subgroups (n=7)for each, to be immersed into QMix ((Dentsply Tulsa Dental, Tulsa, OK, USA), Bio Pure MTAD (Dentsply Tulsa Dental),and saline solutions for 30 minutes. No irrigant was placed over any test material in the other three subgroups. After incubation for 48 hours, the dislodgement resistance of the samples was measured (with and with exposure to the irrigant solutions) using a universal testing machine. Then the samples were examined under stereomicroscope to determine the nature of the bond failures. Results: The lowest push-out bond strength was observed in the MTA group. Biodentine displayed a significantly higher resistance to displacement than the MTA group. Exposure to QMix, MTAD, and saline solutions did not affect the resistance to displacement of the Biodentine and GIC groups, whereas MTA lost strength after exposure to the irrigant solutions ,but the difference was not significant. Conclusions: The PBS of Biodentine and GIC was not affected by the irrigant solutions. Contact with the irrigant solutions did not have a significant effect on the failure modes of the tested materials

Keywords

Biodentine --- push out --- MTAD --- QMix

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