REMINERALIZATION EFFECT OF EGG SHELL POWDER AND NOVAMINE ON INITIAL CARIES-LIKE LESIONS IN YOUNG PERMANENT TEETH (IN-VITRO STUDY)

Bacground/Aim. Glass ionomer cements (GIC) belong to the group of polycarboxyl cements, and one of the principal characteristics of these materials is their anticariogenic potential of fluorine release into saliva and enamel-dentin substance. The aim of this study was to examine the content of released fluorine from GIC restorations (Fuji IX, GC, Japan) of young permanent teeth in the medium of artificial saliva and similar releases in the same medium by the restorations of these teeth treated with a low concentration fluoride solution. Methods. We examined 12 premolars exctracted from orthodontic reasons. The GIC restored teeth were divided into the group treated daily with low concentration fluoride solution (334 ppm) and the control, not treated group. The samples of artificial saliva were analyzed for fluorine ion content using an ion selective electrode. Results. Our comparative analysis of the mean values using the Student?s t-test demonstrated a statistically significant difference in fluorine ion concentration in artificial saliva of fluoridated and non-fluoridated teeth with GIC fillings after 14 and 21 days (p < 0.05), while the difference detected after 7 days was with no statistical significance. Conclusion. The results of this in vitro study indicated that low-concentration fluoride solutions could serve to refluoridate GIC fillings and contribute to an increased fluorine content in saliva. The process of refluoridation of GIC fillings should be advised 2-3 weeks after the restoration, since the release of fluorine from GIC fillings diminishes in time.

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THE EFFECT OF DEPROTEINIZATION PRIOR TO ENAMEL ACID ETCHING ON PIT AND FISSURE SEALANT SHEAR BOND STRENGTH AND NANOLEAKAGE IN PERMANENT TEETH (IN-VITRO STUDY)

Alexandria Dental Journal ◽

10.21608/adjalexu.2019.57373 ◽

2019 ◽

Vol 44 (2) ◽

pp. 108-113

Author(s):

Omneya M. Mowiena ◽

Nadia A. Wahba ◽

Sonia El-Shabrawy ◽

Dalia M. Talaat

Keyword(s):

Bond Strength ◽

Shear Bond Strength ◽

In Vitro Study ◽

Vitro Study ◽

Permanent Teeth ◽

Acid Etching ◽

Fissure Sealant ◽

Pit And Fissure Sealant

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Computed Tomography Assessment of Canal Centering Ability Using Hand and Rotary Instruments - an In Vitro Study

Dental Journal of Advance Studies ◽

10.1055/s-0038-1672064 ◽

2016 ◽

Vol 04 (03) ◽

pp. 165-169

Author(s):

Alka Arora ◽

Devendera Chaudhary ◽

Shalu Krishan ◽

Bhupinder Padda

Keyword(s):

Computed Tomography ◽

Statistical Data ◽

In Vitro Study ◽

Vitro Study ◽

Permanent Teeth ◽

Test Results ◽

Ct Scanner ◽

Variance Test ◽

Rotary Instruments

Abstract Aim: The present in vitro study aims to evaluate canal preparation comparing centering ability of ProTaper, Mtwo, Wave One, Hand Ni-Ti K-files using Computed Tomography(CT). Materials and Methods: Sixty extracted permanent teeth were selected and decoronated at 11 mm from the apical end. Samples were randomly divided into 4 groups as ProTaper, Mtwo, Wave One, Hand Ni-Ti K-files. Teeth were scanned by CT Scanner. Sectioning was started at 1 mm from the apex up to coronal orifice. Nine levels at 1 mm each were chosen for evaluation in the Computed Tomography. The canals were prepared and a post instrumentation scan was again taken. The pre and postoperative CT images were superimposed at all nine levels. The canal centering ability was calculated. Statistical data was evaluated using One Way Analysis Of Variance test. Results: Amongst the rotary and reciprocal groups the best canal centering ability at the apical third was seen with Wave one. All the three groups behaved similarly in the middle and coronal thirds of the root canal. Conclusion: Keeping in mind the importance of apical third preparation and consistent behaviour in all directions, Wave One may be considered by far the best in the apical third.

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