Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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Assessment of the radiant emittance of damaged/contaminated dental light-curing tips by spectrophotometric methods

  • Abdulrahman A. Balhaddad (Dental Biomedical Sciences PhD Program, University of Maryland School of Dentistry) ;
  • Isadora Garcia (Dental Materials Laboratory, School of Dentistry, Federal University of Rio Grande do Sul) ;
  • Fabricio Collares (Dental Materials Laboratory, School of Dentistry, Federal University of Rio Grande do Sul) ;
  • Cristopher M. Felix (BlueLight Analytics Company) ;
  • Nisha Ganesh (Division of Operative Dentistry, Department of General Dentistry, University of Maryland School of Dentistry) ;
  • Qoot Alkabashi (Division of Operative Dentistry, Department of General Dentistry, University of Maryland School of Dentistry) ;
  • Ward Massei (Division of Operative Dentistry, Department of General Dentistry, University of Maryland School of Dentistry) ;
  • Howard Strassler (Division of Operative Dentistry, Department of General Dentistry, University of Maryland School of Dentistry) ;
  • Mary Anne Melo (Dental Biomedical Sciences PhD Program, University of Maryland School of Dentistry)
  • Received : 2020.04.07
  • Accepted : 2020.06.09
  • Published : 2020.11.30
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Abstract

Objectives: This study investigated the effects of physically damaged and resin-contaminated tips on radiant emittance, comparing them with new undamaged, non-contaminated tips using 3 pieces of spectrophotometric laboratory equipment. Materials and Methods: Nine tips with damage and/or resin contaminants from actual clinical situations were compared with a new tip without damage or contamination (control group). The radiant emittance was recorded using 3 spectrophotometric methods: a laboratory-grade thermopile, a laboratory-grade integrating sphere, and a portable light collector (checkMARC). Results: A significant difference between the laboratory-grade thermopile and the laboratory-grade integrating sphere was found when the radiant emittance values of the control or damaged/contaminated tips were investigated (p < 0.05), but both methods were comparable to checkMARC (p > 0.05). Regardless of the method used to quantify the light output, the mean radiant emittance values of the damaged/contaminated tips were significantly lower than those of the control (p < 0.05). The beam profile of the damaged/contaminated tips was less homogeneous than that of the control. Conclusions: Damaged/contaminated tips can reduce the radiant emittance output and the homogeneity of the beam, which may affect the energy delivered to composite restorations. The checkMARC spectrophotometer device can be used in dental offices, as it provided values close to those produced by a laboratory-grade integrated sphere spectrophotometer. Dentists should assess the radiant emittance of their light-curing units to ensure optimal curing in photoactivated, resin-based materials.

Keywords

Acknowledgement

The authors thank Blue Light Analytics for supplying the devices used in this work. AA acknowledges a scholarship from the Imam AbdulRahman bin Faisal University, Dammam, Saudi Arabia. IMG recognizes a scholarship from Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior-Brasil (CAPES)-Finance Code 001-scholarship.

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