A survey of power density of light-curing units used in private dental offices in Changchun City, China

Hao, Xinqing; Luo, Meng Fan; Jian, Wu; Zhu, Shijun

doi:10.1007/s10103-013-1351-0

Cited by 19 publications

(25 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In opposition, Hao, et al 15 (2013) observed that the majority of light-curing units used by Chinese dentists were QTH units, with several years of use. Also, the authors observed that dentists were not aware of the need of periodic testing and maintenance.…”

Section: Discussionmentioning

confidence: 99%

Anterior composite restorations in clinical practice: findings from a survey with general dental practitioners

et al. 2013

View full text Add to dashboard Cite

ObjectivesThe aim of this study was to assess technical preferences of general dental practitioners when restoring anterior composite restorations. How the level of clinical experience or post-graduate training infuenced their options was also tested. Material and MethodsA cross-sectional study was performed using a questionnaire with general dental practitioners (GDPs) (n=276) in Southern Brazil. Information regarding post graduation training (specialization, master's or PhD degree) and linical experience (years since completing graduation) were gathered. The options regarding anterior composite restorations (type of composite, adhesive system, light curing unit, polishing procedures and rubber dam use) were collected. Data were submitted to descriptive analysis and associations were tested. ResultsResponse rate was 68% (187). GDPs selected microhybrid composite (52%) and 2-step total etch adhesive system (77%). LED was the preferred method of activation for 72.8%. Immediate polishing was preferred by 75%, using a combination of techniques. Most of the respondents (74.3%) did not use rubber dam. More experienced clinicians used more halogen lights (p<0.022), performed more light monitoring (p<0.001) and were resistant to use rubber dam (p<0.012). Dentists with post-graduation training used 3-etch-and-rinse system more frequently (p<0.04), usually monitored light intensity (p<0.014) and placed rubber dam more frequently (p<0.044). ConclusionsHybrid composite, simplifed adhesives, LED units and immediate polishing were preferred by Southern Brazilian dentists for anterior composite restorations. Few dentists used rubber dam to perform composite restorations in anterior teeth. Clinical experience and post-graduation training infuenced the dentists' choices.

show abstract

Section: Discussionmentioning

confidence: 99%

Anterior composite restorations in clinical practice: findings from a survey with general dental practitioners

et al. 2013

View full text Add to dashboard Cite

show abstract

“…However, studies have shown that the variation of some physical parameters can significantly change the resin shrinkage during the curing process, concluding that the radiant exitance (or emittance) of the curing device has a correlation with the volumetric contraction induction of photopolymerized composite resins 9 , 15 , 18 . It has been observed a variation of shrinkage stress when the composite is polymerized under different conditions of exposure to the luminous source, being that some studies showed that the irradiance modulation during the photoactivation process has an influence on the shrinkage stress modulus 10 .…”

Section: Introductionmentioning

confidence: 99%

Minimization of polymerization shrinkage effects on composite resins by the control of irradiance during the photoactivation process

et al. 2018

View full text Add to dashboard Cite

High levels of shrinkage stress caused by volumetric variations during the activation process are one of the main problems in the practical application of composite resins. Objective The aim of this study is to reduce the shrinkage stress and minimize the effects caused by composite resin volumetric variation due to the photopolymerization. In this way, this work proposes a systematic study to determine the optimal dimming function to be applied to light curing processes.Material and Methods The study was performed by applying mathematical techniques to the optimization of nonlinear objective functions. The effectiveness of the dimming function was evaluated by monitoring the polymerization shrinkage stress during the curing process of five brands/models of composites. This monitoring was performed on a universal testing machine using two steel bases coupled in the arms of the machine where the resin was inserted and polymerized. The quality of the composites cured by the proposed method was analyzed and compared with the conventional photoactivation method by experiments to determine their degree of conversion (DC). Absorbance measurements were performed using Fourier-transform infrared spectroscopy (FT-IR). A T-test was performed on DC results to compare the photoactivation techniques. We also used scanning electron microscopy (SEM) to analyze in-vitro the adhesion interface of the resin in human teeth.Results Our results showed that the use of the optimal dimming function, named as exponential, resulted in the significant reduction of the shrinkage stress (~36.88% ±6.56 when compared with the conventional method) without affecting the DC (t=0.86, p-value=0.44). The SEM analyses show that the proposed process can minimize or even eliminate adhesion failures between the tooth and the resin in dental restorations.Conclusion The results from this study can promote the improvement of the composite resin light curing process by the minimization of polymerization shrinkage effects, given an operational standardization of the photoactivation process.

show abstract

“…38,39 To date, every study published that has evaluated light curing units (LCU) used in dental offices has shown that many are delivering an inadequate light output and are also poorly maintained. 40,41,42,43,44,45,46,47 In addition to being an averaged value that has been calculated from the power output divided by the tip area, the irradiance values stated by the manufacturers are usually measured only at the light tip. These values can give the dentist the impression they are using a "powerful" curing light, but significantly lower irradiance may be reaching the surface of the resin that is often at least 2 to 8 mm away from the light tip.…”

Section: Effect Of Light Tip To Resin Distancementioning

confidence: 99%

Light curing in dentistry and clinical implications: a literature review

et al. 2017

View full text Add to dashboard Cite

Contemporary dentistry literally cannot be performed without use of resin-based restorative materials. With the success of bonding resin materials to tooth structures, an even wider scope of clinical applications has arisen for these lines of products. Understanding of the basic events occurring in any dental polymerization mechanism, regardless of the mode of activating the process, will allow clinicians to both better appreciate the tremendous improvements that have been made over the years, and will also provide valuable information on differences among strategies manufacturers use to optimize product performance, as well as factors under the control of the clinician, whereby they can influence the longterm outcome of their restorative procedures.

show abstract

A survey of power density of light-curing units used in private dental offices in Changchun City, China

Cited by 19 publications

References 15 publications

Anterior composite restorations in clinical practice: findings from a survey with general dental practitioners

Anterior composite restorations in clinical practice: findings from a survey with general dental practitioners

Minimization of polymerization shrinkage effects on composite resins by the control of irradiance during the photoactivation process

Light curing in dentistry and clinical implications: a literature review

Contact Info

Product

Resources

About