Effect of Multiple usage and surface coarseness of diamond burs on Marginal Microleakage of Resin Composite Restorations (An In- vitro study)

Aim: to compare the effect of multiple usage and surface coarseness of diamond burs on marginal microleakage of cervical resin composite restorations. Materials and methods: sixty extracted premolars without caries were chosen. The sample was randomly divided into three groups: n1=n2=n3=20. Group(1): class v cavities were prepared using super coarse diamond burs, group(2): prepared by coarse diamond burs, whereas group)3(: prepared by medium coarse diamond burs. All cavities were restored by resin composite, then The teeth were thermocycled and immersedIn5%solution of methylene blue dye for 12hours.Then the teeth were sectioned vertically, Dye penetration was evaluated using a 10X stereomicroscope at the occlusal and gingival margins. Data were collected and statistical analysis was conducted. Results: The results showed that the multiple use of super coarse diamond burs caused no significantly statistically affect on occlusal and gingival microleakage (P>0.05). However, the multiple use of coarse and medium diamond burs caused significantly statistically affect on gingival marginal microleakage (P<0.05).

A Cross-Sectional Study on the Knowledge selection, usage, sterilization and Disposal of Dental Burs among dental Professionals in syrian coast

The Aim: To evaluate practioner’s knowledge on dental bur selection, its usage, sterilization procedures undertaken and the method of disposal of dental burs. Materials and Methods: A Questionnaire Performa was prepared about dental burs how to use ,sterilized and disposed of them. in addition to information about doctors to determine the relationship between scientific information of doctors with their experience and Specialty. questionnaire was distributed on a group of dentists in the Syrian coast were chosen at random( N = 100) and during the period of almost two months only ,and then the answers analyzed statistically. Results: The response rate was 76%. However, the results of the current study showed that there was no difference between specialists and non-specialists in the level of information available about the burs and use it, as there was no difference between males and females in the level of information On the other hand, the result showed an inverse relationship between age and the level of information (P˂0.05). only 52% of the dentists were able to determine the appropriate composite finishing bur. Conclusion: The level of the information of dentists in the Syrian coast was considered acceptable Nevertheless, there is an urgent need to increase the wright information of dentists around the burs and their use and also their sterilize.

Comparison Between Using Erbium(Er):YAG laser and Surgical Burs in Bone Removal Around Impacted Lower Third Molars

The aim of this study was to compare the pain and the time consumed during surgical extraction of the impacted lower third molars using Er:YAG laser and surgical burs. The study included 40 impacted molar existed in 20 patients (11male + 9 female) who had two symmetric impacted lower molars. The time consumed during the extraction was measured and the pain was observed during one, three and seven days after the surgical operation. After that the data were statistically studied. As a result of this study, the mean of the time consumed in bone removal was (9.5) minutes using surgical burs and (15.7) minutes using Er:YAG laser. So there was significant difference between the two methods. There was no significant difference in pain between the two methods during the three observation periods. Based on the results of this study, the use of Er:YAG laser as an alternative method to the surgical burs is possible but it consumes a lot of time during bone removal.