Numerical solution of non-Fourier heat transfer during laser irradiation on tooth layers

Falahatkar, S.; Nouri-Borujerdi, A.; Najafi, Mohammad; Mohammadzadeh, Ali

doi:10.1007/s12206-017-1153-6

Cited by 9 publications

(5 citation statements)

References 11 publications

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“…Still, the heat transfer during laser irradiation on tooth layers and the prediction of the temperature profile in the tooth structure is not well defined, but analyses and trends tend to be more realistic if adopting a non-Fourier model [ 64 ].…”

Section: Discussionmentioning

confidence: 99%

Influence of Laser Irradiation Settings, during Diode-Assisted Endodontics, on the Intraradicular Adhesion of Self-Etch and Self-Curing Luting Cement during Restoration—An Ex Vivo Study

Farmakis

Beer²,

Tzoutzas

et al. 2022

Materials

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Background: Diode-assisted endodontics is nowadays utilized for pulp space disinfection, but little is known on the bonding potential of this lased root dentin when the tooth is restored with an intracanal polymer post. Objectives: to investigate the influence of diode laser irradiation settings, in laser-assisted endodontics, on the intraradicular bonding of composite materials. Methods: Sixteen two-rooted, maxillary first premolars were collected, prepared up to F4 (Protaper Universal. Dentsply-Maillefer, Ballaigues, Switzerland), and randomly assigned in two groups: group A (chopped mode or short pulse), diode irradiated according to protocol, pulse 25 ms, power 2.5 W, and group B (microchopped mode or ultrashort pulse), pulse 25 μs, peak power 12 W (both groups GentleRay. KaVo Dental, Biberach an der Riss, Germany). Buccal canals were irradiated, palatal ones served as controls. Canals were then obturated, post space was created in all canals, and quartz-fiber posts (ICE light Danville. Danville Materials, San Ramon, CA, USA) were cemented by self-etch self-curing cement (Max Cem Elite. Kerr, West Collins Orange, CA, USA) (Max Cem Elite. Kerr, Brea, CA, USA). A week later, teeth were sectioned horizontally in 1 mm increments. Push-out test was conducted in a Zwick testing machine (Zwick Roell, Ulm, Germany) at 1 mm/min speed, and the force required to dislodge the post from each specimen (F-max) was recorded. Weibull regression models were applied for statistical analyses. Results: Differences in F-max by group (control vs. chopped mode vs. microchopped mode) and height (meaning the apical-to-coronal position of each specimen along the root) were statistically significant (p < 0.05 in all cases). Conclusions: Short pulses (or chopped mode) had a profound positive effect on the quality of intraradicular bonding, while Ultrashort pulses (or microchopped mode) affected it negatively. In addition, apically positioned bonding proved weaker compared with more coronally located specimens.

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Section: Discussionmentioning

confidence: 99%

Influence of Laser Irradiation Settings, during Diode-Assisted Endodontics, on the Intraradicular Adhesion of Self-Etch and Self-Curing Luting Cement during Restoration—An Ex Vivo Study

Farmakis

Beer²,

Tzoutzas

et al. 2022

Materials

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“…The heat transfer coefficient between tooth and saliva is h=500W/m 2 C while the saliva temperature is Tamb=40 o C. The bio-heat methods such as Pennes equation and thermal wave model lead to physical distortion like infinite propagation speed and temperature overshoot [7,13]. In the other hand, mismatch of material properties and variation of thermal properties are neglected by DPL Bio-heat transfer model [14], while these values might be vary from place to place in a tissue [13]. Based on a novel approach in this investigation, the properties of the tooth are considered as function of position.…”

Section: Physical Model and Bio-heat Conductionmentioning

confidence: 99%

“…The coordinate mapping method transfers the tooth domain into a simpler domain. Also boundaries are aligned with a constant coordinate line [14]. In this method, the ξ and η coordinates are selected based on the r and z directions of tooth, respectively.…”

Section: Grid Generationmentioning

confidence: 99%

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Stress behaviour across human tooth by temperature gradient resulting of laser irradiation

Falahatkar

Nouri-Borujerdi

Najafi

2020

JMES

Self Cite

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The authors report the simulation of temperature distribution and thermally induced stress in the premolar tooth under ND-YAG pulsed laser beam. The Three-Phase-Lag (TPL) non-Fourier model is proposed to describe the heat conduction in the human tooth with nonhomogeneous inner structures. A premolar tooth comprising enamel, dentin, and pulp with real shapes and thicknesses are considered and a numerical method of finite difference was adopted to solve the time-dependent TPL bio-heat transfer, strain and stress equations. The surface heating scheme is applied for simulation of laser therapy. The aim of this laser therapy is that the temperature of pulp reaches to 47oC. The results are achieved as a function of laser heat flux showed when laser beam is irradiated downward (from the top of the tooth), the temperature and thermally induced stress increase as a function of time. The temperature increment is high on the top layers of tooth that is a result of strong absorption of beams by enamel. The thermal stress and strain in the enamel and dentin layers are more than the pulp layer that is a result of weak thermal expansion of them proportional to the pulp layer.

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“…Though there are numerous experimental studies attempt to predict the laser ablation profile are quite far and few. 15,18,26 Most of the studies [27][28][29][30][31][32] are computational model which requires complete knowledge of thermophysical properties and extensive computational resources. 5 Even computational models are tractable only for homogeneous materials like metal, the difficulty in incorporating heterogeneity of the teeth make these models unreliable.…”

Section: Introductionmentioning

confidence: 99%

Physiochemical characteristics: A robust tool to overcome teeth heterogeneity on predicting laser ablation profile

et al. 2020

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To avoid excessive tissue removal and collateral damage, the high‐power density laser is apt for dental surgery also need to have high precision. For high‐precision dental surgery with minimal tissue damage, the present work frames a method to predict laser ablation profile based on surface morphology and chemical composition of dentin. The surface morphology and chemical composition were studied on different dentin samples using scanning electron microscope (SEM) and Energy Dispersive X‐ray Analysis (EDAX), respectively. The key laser ablation parameters (ω0, Deff, and Fth) were determined by laser irradiation study using 800 nm, Ti:Sapphire femtosecond laser at processing condition of 100 fs, 10 kHz and 10 mm/s. The dentin samples show a strong linear correlation between physiochemical characteristics and laser ablation parameters. The surface morphology exhibits a negative linear correlation with threshold fluence, whereas the converse is true for chemical composition. The laser ablation parameters of a random dentin sample are derived from the knowledge of linearity data. From the obtained laser ablation parameters, the complete theoretical ablation profile is constructed and validated with experimental ablation profile. Even though the surface morphology of dentin shows high linearity, the concentration of Ca and P can be used as the most feasible probe in clinical settings. Furthermore, the laser ablation rate and ablation efficiency are predicted by the method to optimize the laser processing condition for any specific teeth. The versatility of the method overcomes the problem of heterogeneity on various teeth and simplifies the method of finding optimal laser processing condition for immaculate laser surgery.

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Numerical solution of non-Fourier heat transfer during laser irradiation on tooth layers

Cited by 9 publications

References 11 publications

Influence of Laser Irradiation Settings, during Diode-Assisted Endodontics, on the Intraradicular Adhesion of Self-Etch and Self-Curing Luting Cement during Restoration—An Ex Vivo Study

Influence of Laser Irradiation Settings, during Diode-Assisted Endodontics, on the Intraradicular Adhesion of Self-Etch and Self-Curing Luting Cement during Restoration—An Ex Vivo Study

Stress behaviour across human tooth by temperature gradient resulting of laser irradiation

Physiochemical characteristics: A robust tool to overcome teeth heterogeneity on predicting laser ablation profile

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