Influence of Class V preparation on in vivo temperature rise in anesthetized human pulp during exposure to a Polywave® LED light curing unit

Zarpellon, Driellen Christine; Runnacles, Patrício; Maucoski, Cristiane; Gross, Dayane Jaqueline; Coelho, Ulisses; Arrais, César Augusto Galvão

doi:10.1016/j.dental.2018.03.003

Cited by 16 publications

(21 citation statements)

References 34 publications

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“…Very limited information is available in the literature regarding in vivo pulpal temperature increase in human teeth exposed to light-curing units. Two recent in vivo studies by Zarpellon et al 11) and Runnacles et al 12) found that most commonly used curing-light exposure times did not cause a higher temperature increase than the threshold value of 5.5°C on human premolars using the same control light-curing unit in this study, Bluephase 20i. Only when an unrestored deep class 5 preparation was exposed to a significantly longer light-curing time (60 s) and significantly greater radiant exposure of (73.9 J/cm 2 ) did the pulpal temperature increase reach 5.5°C 11) .…”

Section: Discussionsupporting

confidence: 57%

“…Two recent in vivo studies by Zarpellon et al 11) and Runnacles et al 12) found that most commonly used curing-light exposure times did not cause a higher temperature increase than the threshold value of 5.5°C on human premolars using the same control light-curing unit in this study, Bluephase 20i. Only when an unrestored deep class 5 preparation was exposed to a significantly longer light-curing time (60 s) and significantly greater radiant exposure of (73.9 J/cm 2 ) did the pulpal temperature increase reach 5.5°C 11) . In this study, the greatest increase in pulpal temperature was produced by the Valo light-curing unit (4.00°C) with an extended curing time of 20 s and radiant exposure of 50.3 J/cm 2 .…”

Section: Discussionsupporting

confidence: 57%

“…The potentially damaging effect of temperature increases on pulp tissue induced from high-irradiance light-curing units is of great concern. Increasing irradiance and exposure time is directly related to increases in temperature 11,12) . Consequently, curing devices with high irradiance should only be activated for a short time.…”

Section: Introductionmentioning

confidence: 99%

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Effect of high-irradiance light curing on exposure times and pulpal temperature of adequately polymerized composite

Slack

Yancey

Lien³

et al. 2020

Dent. Mater. J.

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This study investigated the effect of high-irradiance light-curing on exposure time and pulpal temperature of adequately-cured composite. Composite placed in a molar preparation was cured using high-irradiance light-curing units (Flashmax P3, Valo, S.P.E.C. 3 LED, Cybird XD) and tested for hardness occlusal-gingivally. The first group had exposure times set according to manufacturer settings (recommended), second group to yield 80% of maximum hardness at the 2 mm depth (experimental), and third group was set at 20 s (extended). Exposure time necessary to adequately polymerize the composite at 2 mm depth was 9 s for the Cybird XD and Valo and 12 s for S.P.E.C. 3 LED and Flashmax P3. None of the high-irradiance light-curing units adequately polymerized the composite at the manufacturer-recommended minimum-exposure times of 1-3 s. Exposure times necessary to adequately polymerize composite at 2 mm resulted in a maximum pulpal-temperature increase well below the temperature associated with possible pulpal necrosis.

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Section: Discussionsupporting

confidence: 57%

Section: Discussionsupporting

confidence: 57%

See 1 more Smart Citation

Effect of high-irradiance light curing on exposure times and pulpal temperature of adequately polymerized composite

Slack

Yancey

Lien³

et al. 2020

Dent. Mater. J.

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show abstract

“…One could state that exposure modes delivering radiant exposure values between 20 and 70 J/cm 2 should be added to the sequence of EMs used in the current study, so a more reliable regression analysis could be obtained. However, a recent in vivo study evaluating PT increase in human premolars with Class V preparations observed similar relationship between radiant exposure values and PT rise 21 . In that study, another EM delivering a radiant exposure of approximately 37.3 J/cm 2 was tested.…”

Section: Discussionmentioning

confidence: 86%

“…The participants were seen between March and April, 2013. Inclusion and exclusion criteria were based on previous in vivo studies, 19 – 21 and included (1) treatment plans indicating premolar extractions for orthodontic reasons, (2) the presence of healthy, intact, non-carious, and non-restored, fully erupted treatment teeth, and (3) patients with well-controlled health conditions that allowed all procedures involved in the research to be performed with minimal risk. Exclusion criteria included (1) patients who did not agree to volunteer for the study, (2) patients not meeting all of the inclusion criteria.…”

Section: Methodsmentioning

confidence: 99%

Comparison of in vivo and in vitro models to evaluate pulp temperature rise during exposure to a Polywave® LED light curing unit

et al. 2019

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Objectives: To measure and compare in vivo and in vitro pulp temperature (PT) increase (ΔTEMP) over baseline, physiologic temperature using the same intact upper premolars exposed to the same Polywave ® LED curing light. Methodology: After local Ethics Committee approval (#255,945), local anesthesia, rubber dam isolation, small occlusal preparations/minute pulp exposure (n=15) were performed in teeth requiring extraction for orthodontic reasons. A sterile probe of a temperature measurement system (Temperature Data Acquisition, Physitemp) was placed within the pulp chamber and the buccal surface was sequentially exposed to a LED LCU (Bluephase 20i, Ivoclar Vivadent) using the following exposure modes: 10-s low or high, 5-s Turbo, and 60-s high. Afterwards, the teeth were extracted and K-type thermocouples were placed within the pulp chamber through the original access. The teeth were attached to an assembly simulating the in vivo environment, being similarly exposed while real-time temperature (°C) was recorded. ΔTEMP values and time for temperature to reach maximum (ΔTIME) were subjected to two-way ANOVA and Bonferroni's post-hoc tests (pre-set alpha 0.05). Results: Higher ΔTEMP was observed in vitro than in vivo . No significant difference in ΔTIME was observed between test conditions. A significant, positive relationship was observed between radiant exposure and ΔTEMP for both conditions ( in vivo : r2=0.917; p<0.001; in vitro : r2=0.919; p<0.001). Conclusion: Although the in vitro model overestimated in vivo PT increase, in vitro PT rise was close to in vivo values for clinically relevant exposure modes.

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Effect of spray air settings of speed-increasing contra-angle handpieces on intrapulpal temperatures, drilling times, and coolant spray pattern

Lempel

Szalma

2021

Clin Oral Invest

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Objectives Decreasing aerosol leaks are of great interest, especially in the recent era of COVID-19. The aim was to investigate intrapulpal heat development, coolant spray patterns, and the preparation efficiency of speed-increasing contra-angle handpieces with the spray air on (mist) or off (water jet) settings during restorative cavity preparations. Methods Standard-sized cavities were prepared in 80 extracted intact human molar teeth using diamond cylindrical drills with a 1:5 speed-increasing contra-angle handpiece. A custom-made device maintained the standardized lateral drilling force (3 N) and predetermined depth. Temperatures were measured using intrapulpal thermocouple probes. The four experimental groups were as follows: mist cooling mode at 15 mL/min (AIR15), water jet cooling mode at 15 mL/min (JET15), mist cooling mode at 30 mL/min (AIR30), and water jet cooling mode at 30 mL/min (JET30). The coolant spray pattern was captured using macro-photo imaging. Results The JET15 group had the highest increase in temperature (ΔT = 6.02 °C), while JET30 (ΔT = 2.24 °C; p < 0.001), AIR15 (ΔT = 3.34 °C; p = 0.042), and AIR30 (ΔT = 2.95 °C; p = 0.003) had significantly lower increases in temperature. Fine mist aerosol was formed in the AIR15 and AIR30 preparations but not in the JET15 and JET30 preparations (p < 0.001). The irrigation mode had no influence on the preparation time (p = 0.672). Conclusions Water jet irrigation using coolant at 30 mL/min appeared to be the optimal mode. Considering the safe intrapulpal temperatures and the absence of fine mist aerosols, this mode can be recommended for restorative cavity preparations. Clinical significance To increase infection control in dental practices, the water jet irrigation mode of speed-increasing handpieces with coolant flow rates of 30 mL/min should be considered for restorative cavity preparations.

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Influence of Class V preparation on in vivo temperature rise in anesthetized human pulp during exposure to a Polywave® LED light curing unit

Cited by 16 publications

References 34 publications

Effect of high-irradiance light curing on exposure times and pulpal temperature of adequately polymerized composite

Effect of high-irradiance light curing on exposure times and pulpal temperature of adequately polymerized composite

Comparison of in vivo and in vitro models to evaluate pulp temperature rise during exposure to a Polywave® LED light curing unit

Effect of spray air settings of speed-increasing contra-angle handpieces on intrapulpal temperatures, drilling times, and coolant spray pattern

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