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Year : 2016  |  Volume : 7  |  Issue : 2  |  Page : 64-68

A clinical survey of the output intensity of light curing units in dental offices across Nellore urban area

Department of Conservative Dentistry and Endodontics, Narayana Dental College and Hospital, Nellore, Andhra Pradesh, India

Correspondence Address:
Tavva Venkata Swathi
Department of Conservative Dentistry and Endodontics, Narayana Dental College and Hospital, Nellore, Andhra Pradesh
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0976-433X.182657

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Aim: The aim of the survey was to examine the output intensity of curing units and other related factors in private dental offices across Nellore urban area. Materials and Methods: A questionnaire was prepared about the type of curing unit, number of restorations performed in a week, maintenance of curing unit, frequency of changing bulb, measurement of output intensity, presence, or absence of composite build--ups on curing tips. The questionnaire was submitted to 100 private dental offices located in Nellore urban area. Each variable in the questionnaire had an impact on quality of the composite restoration. Each curing unit light tip was also observed for the presence or absence of composite build--up. The output intensity of the curing light was measured using a digital radiometer (Ivoclar). The average of the three readings of the output intensity was obtained for each curing light. The average output intensity was divided into three categories (<400 mW/cm2, 400–850 mW/cm2, and 850–1000 mW/cm2). Statistical Analysis: The results were statistically analyzed using linear regression analysis. Results: Among the 100 curing units examined, 84 were light emitting diode (LED) units, and 16 were quartz tungsten halogen (QTH) units. Only 22% LED machines and 3% QTH curing units had adequate intensities (>850 mW/cm2). A significant reduction in output intensity is seen with both types of older light curing units. Nearly 50% of practitioners had never checked the light output of their unit. Conclusion: It was concluded that there is a general lack of awareness among dentists of the need for maintenance of these units.

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