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Article
Effect of curing modes on the depth of cure of resin composite

Author: Abdul–Adheem R Al–Mallah
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2007 Volume: 7 Issue: 2 Pages: 195-200
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: To study the effect of different curing modes of Light emitting diodes (LED) curing unit on thedepth of cure (DOC) of composite resin with light and dark shades and compare the results withconventional curing method by the use of halogen curing light. Materials and Methods: A total of 40cylindrical composite resin samples (4mm diameter and 6mm height) were prepared, 20 of light shadeand 20 of dark shade. They were subjected to four curing modes (n=5 for each group): conventionalhalogen light, and three modes related to the LED light curing unit (LCU) which were: Fast (F); Ramped(R); and Pulsed (P). The samples were irradiated to the time required by the manufacturer for each curingmode, and a digital micrometer was used to measure the depth of cure according to scraping methoddescribed in ISO 4049:2000. Data were collected and analyzed for comparison. Results: No significantdifference was found in the DOC of composite irradiated by LED curing light for all of the three curingmodes or shade. However, the LED produced significantly greater depths of cure when compared withconventional halogen curing unit for both shades. The lighter shade was cured to a significantly greaterdepth than dark one when considering halogen LCU. Conclusions: All curing modes of the LED lightcan produce similar DOC regardless of composite shade when irradiated to the time recommended by themanufacturer. However, Curing with conventional halogen curing unit yielded the least DOC values forlight or dark shades when compared with LED units. Longer irradiation times are needed to cure darkshades by the use of halogen LCUs.


Article
Evaluation of endodontic work in Mosul city

Authors: Raid M Basheer --- Ragheed M Basheer --- Abdul–Adheem R Al–Mallah
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2007 Volume: 7 Issue: 1 Pages: 50-60
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: To evaluate different steps of endodontic procedures done by the dentists in Mosul city. Materials and Methods: A dental questionnaire sheet that consisted of 21 questions regarding numerous steps of endodontics starting from pre–operative (diagnostic) phase to post–operative (final restoration) phase was distributed randomly to 150 dentists working in Mosul city. The dentists involved in the study were both specialists and non–specialists. Then, the sheets were collected and the data analyzed. Results: Revealed that there was a difference in performing specific steps of endodontics between the dentists. In some questions there was no great difference between specialists and non–specialists, but in other procedures, a great difference could be observed. This difference was not only between specialists and non–specialists groups, but also inside these groups as well. Conclusions: The dentists in Mosul city generally lack information about some important steps in endodontic work that may affect negatively the outcome of the procedure as a whole. This deficiency can be compensated for by holding continuous education programs in addition to the dentists’ responsibility in staying in contact with the most modern advancements in different fields of dentistry.


Article
Shear bond strength of posterior comp-osite cores

Authors: Jabbar H Kamel --- Abdul–Adheem R Al–Mallah --- Ahmed H Kharoufa
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2005 Volume: 5 Issue: 1 Pages: 69-74
Publisher: Mosul University جامعة الموصل

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Abstract

This study was designed to evaluate the shear bond strength(SBS) of posterior composite resin cores to tooth surface usingtwo dental adhesives and two retentive means.Thirty extracted permanent molars were used for this purpose.They were made flat by removing the occlusal one thirdusing “stone grinding wheal”. Teeth were then randomly dividedinto six groups:Groups I and IV: Scotchbond Multipurpose Plus (SbMP)and All bond 2 dental adhesives were used for groups I and IVrespectively to adhere composite to the flat tooth surface with noretentive mean as the control group.Groups II and V: A circumferential slot was prepared andcomposite attached to the tooth using SbMP and All bond 2 forgroups II and V respectively.Groups III and VI: Four self threading pins were placedand composite adhered using SbMP and All bond 2 for groups IIIand VI respectively.After storage and thermal cycling, the SBS for each groupwas measured using “universal testing machine”.The results varied according to the retentive mean and dentaladhesive used. Groups with four pins produced the highest SBSand groups with no retentive mean showed the lowest SBS. Alsothe groups using All bond 2 adhesive generally had higher valueswhen compared with the same groups using SbMP dental adhesive.Within the limits of this study, it is indicated that when thehighest SBS is to be achieved, then All bond 2 dental adhesivewith pins should be used.

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