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Journal of Oral Laser Applications

Year 2002
Volume 2 , Issue 2

Pages: 95 - 99

Effect of Nd:YAP Laser on Dental Cementum: A Scanning Electron Microscopic Study

Sami S. Shafik/Ahmed Osama Kheir/Faisal Kany/Mona Omran

Purpose: This study was undertaken to evaluate the effect of Nd:YAP laser on root surface cementum. Materials and Methods: Eighteen teeth extracted for orthodontic purposes were utilized in the study. Root surfaces were subjected to Nd:YAP laser using nine parameter settings pre-adjusted by the manufacturer to produce different energy density levels. Two teeth were subjected to each power setting at a fixed distance of 5 mm. After laser application, teeth were dehydrated and prepared for examination with a scanning electron microscope (SEM). Results: Changes in cementum surface were correlated to three ranges of energy density levels. With the energy density range from 509 to 573 J/cm2, a heavily cracked cementum surface was the characteristic feature. With an energy density range of 796 to 892 J/cm2, cementum depressions and perforations were observed with rough irregular margins denoting cementum destruction. Higher energy density levels ranging from 1051 to 1146 J/cm2 affected the cementum severely, causing melting and cracking, exposing the underlying structures. Conclusions: It can be concluded from this study that Nd:YAP laser is destructive to root cementum and the extent of damage depends on the energy density level produced. Further studies are recommended to determine specific Nd:YAP laser parameters that will not adversely affect root surface cementum.


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