Effect of the Spray Pattern, Water Flow Rate, and Cutting Position on the Cutting Efficiency of High-Speed Dental Handpieces

Yang, Wenjie; Sun, Jian

doi:10.11607/ijp.3008

Cited by 8 publications

(7 citation statements)

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“…Reduced cutting efficiency and debris clogging result in concentration of frictional heat which in turn leads to an increase in pulpal temperature [5]. One study found an improvement in cutting efficiency with 3- and 4- ports while making groove cuts [15], while other studies found no significance [16]. This may be due to the different arrangements of the coolant port and bur, which consequently impacted coolant accessibility to the surface.…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…In addition, dental handpieces with a multiport coolant design exhibit greater cutting efficiency compared to those with a single coolant port, even if the 1-port handpiece has a higher coolant flow rate. 15,16 The difference in remaining dentine thickness between cuts may have also influenced the results, despite this factor being minimized through the selection of teeth with similar morphology, and standardization of the bur type, size, cavity preparation length, and distance from the center of the tooth, as well as using each tooth as the control for each preparation. In addition, other factors that have not been intensely studied, such as the size of the coolant port aperture and the speed of the water coolant, could have influenced the cooling efficiency during drilling and contributed to the observed findings.…”

Section: Discussionmentioning

confidence: 99%

“…Theoretically, and as advertised by numerous dental manufacturers without any scientific validation, handpieces containing a greater number of coolant ports display greater cooling efficiency due to the wider distribution of the coolant over the cutting surfaces. In addition, dental handpieces with a multiport coolant design exhibit greater cutting efficiency compared to those with a single coolant port, even if the 1‐port handpiece has a higher coolant flow rate 15,16 . The difference in remaining dentine thickness between cuts may have also influenced the results, despite this factor being minimized through the selection of teeth with similar morphology, and standardization of the bur type, size, cavity preparation length, and distance from the center of the tooth, as well as using each tooth as the control for each preparation.…”

Section: Discussionmentioning

confidence: 99%

New aerosol‐decreasing dental handpiece functions sufficiently decrease pulp temperature: An in vitro study

Lau

Choi

2023

Journal of Prosthodontics

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PurposeTo assess the changes in intrapulpal temperature between electric high‐speed handpieces of different coolant functions (‘Water Jet’ and ‘Water Spray’), coolant port designs (1‐ and 4‐port), suction use, and bur and tooth types using an experimental in vitro setup.Materials and methodsForty‐four extracted anterior and posterior teeth were collected. A total of 18 groove cuts (n = 18/coolant port spray design, bur and tooth type group) and 12 groove cuts (n = 12/tooth type and suction use) were completed, with a total of 264 groove cuts. Real‐time temperature and duration were recorded at 1‐s intervals throughout the preparation process using a thermocouple and digital data logger setup (GFX Data Logger Series and EL USB‐TC; Lascar Electronics Inc., USA), and the data retrieved using EasyLog Software (EasyLog USB; Lascar Electronics Inc., USA). Statistical analysis was performed (SPSS V.27) for the change in temperature using the analysis of variance and post hoc analysis.ResultsThe majority of the specimen cuts, regardless of tooth (anterior or posterior) and bur (diamond or carbide) types, handpiece coolant port design, and suction use showed an overall decreasing trend in intrapulpal temperature. No cuts caused a mean temperature change that reached the critical temperature of 42.5°C or resulted in an overall increase in intrapulpal temperature when the 60‐s duration was completed.ConclusionsThe tested electric handpieces efficiently reduced intrapulpal temperature, with the majority displaying a decreasing trend. A greater decrease in intrapulpal temperature was observed in canines compared to premolars; carbide burs compared to diamond; and with no suction preparations compared to when suction was used.

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“…Moreover, it is well known that the heat produced during restorative procedures is a source of trauma for the dental pulp and has been suggested to lead to inflammation and necrosis [ 19 , 20 ]. This is because during tooth preparation a variable amount of heat is transmitted to the tooth, depending on the type of bur, cutting time, and rate, the pressure applied, the cooling technique, and the speed and torque of the rotary instrument [ 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Pulp Chamber Temperature during Tooth Veneer Preparation Using Burs with Different Degrees of Wear—A Preliminary In Vitro Study

et al. 2023

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The heat produced during tooth preparation could be a source of damage for dental pulp, and many variables are involved in this process. The aim of this in vitro study was to evaluate whether the different degrees of wear of the diamond burs significantly influenced the temperature changes in the pulp chamber during tangential veneer preparation. The sample comprised 30 intact permanent monoradicular teeth, randomly assigned to three study groups of 10 teeth each, of which 5 had the pulp tissue preserved and 5 had thermoconductive paste in the pulp chamber. For prosthetic preparation, we used new burs in the first group, burs at their fifth use in the second group, and burs at their eighth use for the third group. The pulp chamber temperature was evaluated at the start, after one minute, and after three minutes of preparation, using a k-type thermocouple. The results of the three-way ANOVA and Tukey post hoc comparisons showed a highly significant effect of the time of measurement, while the pulp condition and the degree of wear of the burs had no effect. In conclusion, the different degrees of wear of conventional diamond burs do not produce statistically significant different changes in the pulp chamber temperature.

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Effect of the Spray Pattern, Water Flow Rate, and Cutting Position on the Cutting Efficiency of High-Speed Dental Handpieces

Cited by 8 publications

References 0 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

New aerosol‐decreasing dental handpiece functions sufficiently decrease pulp temperature: An in vitro study

Evaluation of the Pulp Chamber Temperature during Tooth Veneer Preparation Using Burs with Different Degrees of Wear—A Preliminary In Vitro Study

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