Document Details

Document Type : Article In Journal 
Document Title :
A Comparative Study On The Effect Of Two Laser Treatments On The Shear Dentin
دراسة مقارنة لتأثير نوعين من المعالجة السطحية على قوة ربط القصية للراتنج على العاج والميناالسينة
 
Document Language : English 
Abstract : Great advances in laser technology have occurred in the field of dentistry. The application of different lasers on hard tissue was investigated since 1964. But now having Er-YAG and Nd -YAG coupled with cooling streams of water, they can effectively remove the dental hard tissue forming a rough surface that might be suitable for resin bonding. In this study the shear bond strength of composite resin to acid, Er-YAG and Nd- YAG lasers etched enamel and dentin were measured and the topographical difference on enamel and dentin surfaces were further studied using the (SEM) on extracted human teeth. The Nd- YAG laser used on hard tooth structures in this study was at 320mJ/pulse at pulse frequency of 8 Hz. Also, Er-YAG was used at 200mJ/pulse at a rate of 3 Hz with cooling water spray for both. The control group was ac id etched with 37% phosphoric acid for 15 seconds. Shear bond strength was tested at a crosshead speed of 2mm/min. There was no significant difference among the three groups of composite bonded to enamel. However, significant difference (P < .05) between acid versus Nd-YAG, and acid versus Er-YAG on dentin. When the bond strength of each group was compared between enamel and dentin, the dentin lazed with Nd -YAG was significantly lower in shear bond strength than enamel (P<.05). Enamel lazed with Nd-YAG and Er- Y AG showed similar topographical changes. In both conditions enamel exhibited raised flaky protuberances with cracking and crazing of the surface . The dentin lazed with Er-YAG exhibited more pronounced hills and valley like appearance more than dentin lazed with Nd-YAG. 
ISSN : 1 
Journal Name : Alexandria Dental Journal 
Volume : 23 
Issue Number : 1 
Publishing Year : 1998 AH
1998 AD 
Article Type : Article 
Added Date : Thursday, December 6, 2007 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
هناء جمجومJamjoom, Hana InvestigatorDoctoratehjamjoom@kau.edu.sa
عمرو محروسMahrous, Amr ResearcherDoctorate 

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