The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
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A STUDY ON THE EFFECT OF PULSED Nd : YAG LASER IMPACTS TO THE ENAMEL SURFACE AND BOND STRENGTH WITH COMPOSITE RESIN

Nd : YAG레이저 조사시(照射時) 치아(齒牙) 법랑질(琺瑯質)의 변화(變化) 및 접착력(接着力)에 관(關)한 연구(硏究)

  • Park, Jong-Man (Department of Prosthodontics, College of Dentistry, Chonbuk National University) ;
  • Bae, Tae-Seong (Department of Prosthodontics, College of Dentistry, Chonbuk National University) ;
  • Song, Kwang-Yeob (Department of Prosthodontics, College of Dentistry, Chonbuk National University) ;
  • Park, Charn-Woon (Department of Prosthodontics, College of Dentistry, Chonbuk National University)
  • 박종만 (전북대학교 치과대학 보철학교실) ;
  • 배태성 (전북대학교 치과대학 보철학교실) ;
  • 송광엽 (전북대학교 치과대학 보철학교실) ;
  • 박찬운 (전북대학교 치과대학 보철학교실)
  • Published : 1991.02.01
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Abstract

The purpose of this study was to determine the optimum range of laser energy density to the enamel surface of permanent incisors when they are irradiated with the pulsed Nd : YAG laser, Laser impacts on each experimental group were made at energy density of $20\sim50J/cm^2$ by 20 pulses of the pulse width 1.2 msec. The author investigated the enamel surface with the sunning electron microscope(SEM) and the surface roughness tester, and measured the shear bond strength between electrolytically etched Ni-Cr-Be alloy casting and composite resin. The obtained results were as follows: 1. The surface roughness of enamel after laser irradiation showed the significant difference level from the energy density $40J/cm^2(P<0.05)$. 2. The mean shear bond strength of etched-metal resin-bonded specimens were $154.23{\pm}33.30kg/cm^2$ at unlased enamel surface and $195.72{\pm}29.56kg/cm^2$ at lased energy density $30J/cm^2$, and showed a significant difference(P<0.05). 8. SEM photographs showed the irregular microcracks and the structural changes of lased enamel surface. 4. SEM photographs of the fracture surface after testing the shear bond strength showed the aspect of interfacial fracture between bonding agent and composite resin at the metal sides.

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