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Article
The effect of the CO2 laser on the enamel cracks

Author: Dr. Muthenna Sh. Rajab. *
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2008 Volume: 5 Issue: 2 Pages: 148-153
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The objective of this study aimed to assess the effeats of the CO2 laser on the enamel cracks. The labial cracks of thirty extracted central incisors were irradiated with 4 Watts power and (0.4, 0.2 and 0.1) pulse durations. The laser used was CO2 laser with 10.6 μm in wavelength. The irradiated samples were sectioned into ground cross sections and examined under polarizing microscope. Enamel cracks can not be welded completely using CO2 laser irradiation. Although the formation of superficial glaze layer, there was a tendency to increase in the separation of the crack sides as the pulse duration of the laser increased

Keywords

Keywords: Enamel --- Crack --- CO2 --- Laser


Article
Prevention of Enamel Caries by Low Power Dye Assisted He-Ne Laser: an In Vitro Study

Author: Dr. Muthenna Sh. Rajab.* د. مثنى رجب
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2008 Volume: 5 Issue: 3 Pages: 239-243
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The objective of this study aimed to assess the carieslike lesion preventive potential of low power dye assisted He-Ne laser.Enamel of extracted human premolar teeth were painted with methylene blue dye and irradiated with 5 mW of He-Ne laser, which emitted laser with 632.8 nm in wavelength. Another group were irradiated without dye application, and the third group was served as control (without laser irradiation). All samples were subjected to carieslike lesion formation by 3.5 pH lactic acid for 21 days. The crowns after that were sectioned into ground cross sections and the lesion depths were measured under a polarizing microscope.According to this study, successful carieslike lesion inhibition could be achieved to 29% extent, by using low power dye assisted He-Ne laser irradiation.

Keywords

Keywords: Enamel --- Caries --- He-Ne --- Laser --- Dye


Article
Root trunk height of maxillary and mandibular permanent first molars in Iraqis (a pilot study)

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Abstract

Although the Root Trunk Height (RTH) as a variable in different racial groups was extensively studied, but its relation to the presence and absence of other anatomical abnormalities as Cervical Enamel Projection (CEP) never been tested. On the other hand, data focused on this variable in our community are not available. So the aim of this pilot study is to provide a base line data on this important anatomical variable (RTH) in our community and to calculate its possible correlation to the presence of (CEP). In this study (242) extracted permanent molars (126 maxillary first molar and 116 mandibular first molar) were collected from the dental clinics of Al-Mustansiriya teaching hospital /college of dentistry. RTH for each tooth was measured and presence of CEP was recorded. Results of this research showed that that mean values of RTH of permanent first molars in Iraqis were comparable with that found in other countries. On the other hand, there is a highly significant relation between the RTH and presence of CEP on buccal and mesial aspects of maxillary first molar and buccal aspect of mandibular first molar, while this relation is not significant on distal aspect of maxillary first molar and lingual aspect of mandibular first molar.

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