An ex-vivo model to determine dental pulp responses to heat and light-curing of dental restorative materials

Lynch, Christopher D.; Roberts, Jessica L.; Alshehri, Ali Nasser; Milward, Paul J.; Sloan, Alastair James

doi:10.1016/j.jdent.2018.08.014

Cited by 13 publications

(15 citation statements)

References 30 publications

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“…Thermal stimulants may result in greater temperature increase in clinical settings where the pulpal blood flow does not dissipate effectively [25, 26]. Further investigation of the effect of different water coolant port designs could employ another novel method using tooth slices to analyse the response of the pulpal irrigation [27]. In future studies, a better pulpal simulation experimental set up would be helpful to find the exact temperature change during the tooth preparation.…”

Section: Discussionmentioning

confidence: 99%

The cooling efficiency of different dental high-speed handpiece coolant port designs

Chua

Choi

Ramani

et al. 2019

Heliyon

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The study investigated the cooling efficiency of different numbers of water coolant ports on high-speed handpieces (HSH) under cooling conditions used in clinical practice. Twenty-four groove cuts with water on and nine cuts without water were made on extracted human premolars using three HSHs with different port configurations. Thermocouples were placed in the pulp chambers and temperature changes were recorded with 1-, 3- and 4-coolant port handpieces. Cooling rate was calculated for each coolant port design system. Temperature changes were statistically analysed with Kruskal-Willis Test. All three sample groups resulted in a net temperature decrease during the cutting period with water turned on. There was a pattern of increased cooling rate with increasing number of coolant ports (1-port: -4.27 (±0.94) °C, 3-port: -4.66 (±2.90) °C, 4-port: -5.03 (±1.08) °C). The difference was not statistically significant ( p = 0.681). Calculations of cooling rate showed a higher cooling rate with an increase in the number of ports (1-port: 46.13 × 10 −4 K −1 , 3-port: 51.36 × 10 −4 K −1 , 4-port: 56.32 × 10 −4 K −1 ). In the dry tooth preparation samples, all resulted in a net increase in temperature (1-port: 4.43 (±3.30) °C, 3-port: 5.13 (±3.27) °C, 4-port: 2.87 (±2.97) °C). All the three water coolant port configurations showed effective cooling of the tooth during cutting and decreased pulpal temperature with no statistical difference. There are HSH designs with varying numbers of coolant ports available in the market for clinicians. The results of the current study could potentially aid clinicians in making a decision while choosing between different dental handpieces.

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Section: Discussionmentioning

confidence: 99%

The cooling efficiency of different dental high-speed handpiece coolant port designs

Chua

Choi

Ramani

et al. 2019

Heliyon

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“…Although JET15, similar to JET30, did not cause radial atomization originating from the coolant and drill interaction, from a thermal point of view (mean temperature increase of 6.02 °C with a maximum increase of 6.9 °C), it was clear that JET15 could not be recommended. The accepted thermal threshold for pulp tissue, to prevent pulpal necrosis, is an increase of 5.5 °C [ 21 , 24 , 29 – 32 ]. Temperature increases of 6 °C or more made heat shock protein 70 immediately detectable [ 32 ].…”

Section: Discussionmentioning

confidence: 99%

“…The accepted thermal threshold for pulp tissue, to prevent pulpal necrosis, is an increase of 5.5 °C [ 21 , 24 , 29 – 32 ]. Temperature increases of 6 °C or more made heat shock protein 70 immediately detectable [ 32 ]. In addition, the reaction of the pulp greatly depends on the general condition of the pulp tissue [ 24 , 30 , 33 ].…”

Section: Discussionmentioning

confidence: 99%

“…In addition, the reaction of the pulp greatly depends on the general condition of the pulp tissue [ 24 , 30 , 33 ]. The remaining dentin thickness may further influence pulpal coagulation necrosis [ 32 , 34 ]. The combination of irritating stimuli may lead to clinically symptomless chronic inflammation before progressing to more severe irreversible pulpal damage [ 30 ].…”

Section: Discussionmentioning

confidence: 99%

“…According to Zarpellon et al, this cumulative thermal load with second and third generation light emitting diode LCUs may be up to 23.2 °C in the pulp chamber [ 29 ]. Lynch et al found that even with 1.39 mm of dentine thickness and only during 10 s of exposure, the mean temperature change can be 13.9 °C [ 32 ].…”

Section: Discussionmentioning

confidence: 99%

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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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SrCuSi₄O₁₀/GelMA Composite Hydrogel‐Mediated Vital Pulp Therapy: Integrating Antibacterial Property and Enhanced Pulp Regeneration Activity

Tian

Kong

et al. 2023

Adv Healthcare Materials

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Vital pulp therapy (VPT) is considered a conservative treatment for preserving pulp viability in caries‐induced dental pulp infections. However, bacterial contamination negatively affects dentine‐pulp complex repair. The common capping materials show limited antimicrobial effects against some microorganisms. To improve the VPT efficacy, capping materials with increased antibacterial properties and enhanced odontogenic and angiogenic activities are needed. Herein, a SrCuSi4O10/gelatin methacrylate(SC/Gel) composite hydrogel has been proposed for infected dental pulp treatment. SrCuSi4O10 (SC) is a microscale bioceramic composed of assembled multilayered nanosheets that possesses good near‐infrared photothermal conversion ability and multiple bioactivities due to sustained Sr2+, Cu2+, and SiO32− ion release. It is shown that the SC/Gel composite hydrogel efficiently eliminates Streptococcus mutans and Lactobacillus casei and inhibits biofilm formation under photothermal heating, while the ion extract from SC promotes odontogenesis of rat dental pulp stem cells and angiogenesis of human umbilical vein endothelial cells. The as‐designed therapeutic effect of SC/Gel composite hydrogel‐mediated VPT has been proven in a rat dental pulp infection model and yielded improved dentine‐pulp complex repair compared with the commercially used iRoot® BP Plus. This study suggests that the SC/Gel composite hydrogel is a potential pulp‐capping material with improved effects on dentine−pulp complex repair in infected pulp.

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An ex-vivo model to determine dental pulp responses to heat and light-curing of dental restorative materials

Cited by 13 publications

References 30 publications

The cooling efficiency of different dental high-speed handpiece coolant port designs

The cooling efficiency of different dental high-speed handpiece coolant port designs

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

SrCuSi₄O₁₀/GelMA Composite Hydrogel‐Mediated Vital Pulp Therapy: Integrating Antibacterial Property and Enhanced Pulp Regeneration Activity

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An ex-vivo model to determine dental pulp responses to heat and light-curing of dental restorative materials

Cited by 13 publications

References 30 publications

The cooling efficiency of different dental high-speed handpiece coolant port designs

The cooling efficiency of different dental high-speed handpiece coolant port designs

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

SrCuSi4O10/GelMA Composite Hydrogel‐Mediated Vital Pulp Therapy: Integrating Antibacterial Property and Enhanced Pulp Regeneration Activity

Contact Info

Product

Resources

About

SrCuSi₄O₁₀/GelMA Composite Hydrogel‐Mediated Vital Pulp Therapy: Integrating Antibacterial Property and Enhanced Pulp Regeneration Activity