Laser Technology for Caries Removal

Matos, Adriana Bona; Azevedo, Cynthia Soares de; Ana, Patrícia Aparecida; Botta, Sérgio Brossi; Zezéll, Denise Maria

doi:10.5772/37227

Cited by 5 publications

(5 citation statements)

References 71 publications

(135 reference statements)

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“…The average thickness of high-risk carotid plaque is 2.7mm, with its components being WBCs (macrophages), lipids, a fibrous cap, calcification (hydroxyapatite), IPH and microvasculature [47,[58][59][60][61][62]. The fibrous cap consists primarily connective tissue made up of elastin and collagen, covering the lipid core from the blood flow in the carotid lumen above it.…”

Section: Plaque and Iphmentioning

confidence: 99%

“…At 630 nm, the optical absorption coefficients of lipids, collagen, elastin and hydroxyapatite are ∼ 0.008cm −1 , ∼ 0.08cm −1 , ∼ 0.25cm −1 and ∼ 0.01cm −1 respectively, with macrophages having negligible absorption [47,59,60,62]. The microvasculature is assumed to carry primarily oxygenated blood (OxyHb) which has an absorption coefficient of ∼ 3 − 4cm −1 at 630nm.…”

Section: Plaque and Iphmentioning

confidence: 99%

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Monte Carlo and Tissue-Phantom studies of Photoacoustic Imaging of Carotid Intraplaque Haemorrhage

Khiari¹

2021

Preprint

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Strokes are the second leading cause of death worldwide. Vulnerable carotid plaques are a primary cause of stroke, with carotid Intraplaque Haemmorrghages being a key feature of vulnerability. MR imaging, which is sensitive to the presence of endogenous Methemoglobin (MetHb), is used to detect IPH. MRI is however expensive, and not readily available. We propose the use of Photoacoustic Imaging (PAI) for the detection of IPH, with MetHb being the primary PA imaging target. I examine the feasibility of this approach by performing Monte Carlo studies of light propagation, energy deposition and PA generation in tissuemimicking models, as well as experimental PA measurements of MetHb in tissue-mimicking phantoms. I show that is possible to achieve an SNR of ∼50dB at the average carotid artery depth of ∼21mm, with the possibility of imaging up to ≥ 32mm in Type I skin using commonly available hardware.

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Section: Plaque and Iphmentioning

confidence: 99%

Section: Plaque and Iphmentioning

confidence: 99%

Monte Carlo and Tissue-Phantom studies of Photoacoustic Imaging of Carotid Intraplaque Haemorrhage

Khiari¹

2021

Preprint

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“…In addition, the absence of noise, pressure and vibration makes the dental treatment less traumatic, especially for children. A reduced pain perception was shown in patients during laser treatment and therefore less need for local anesthesia was reported (1,6) .…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Erbium Laser Versus A Chemo-Mechanical Caries Removal Method in Primary Teeth

2021

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Purpose:The purpose of this study was to evaluate the caries removal using Er,Cr:YSGG laser and Papacarie chemo-mechanical caries removal (CMCR) method in primary teeth. Materials and Methods: Patients (4 -8 years old) having 40 carious primary molars with dentin involvement were selected for this study. Caries was removed using two methods; Group 1 (Laser) Waterlase MD turbo Er,Cr:YSGG Laser using Quartz tips (MZ -8) on the Gold handpiece and group 2 (CMCR) Papacarie Duo gel. Final restoration was done by Riva light cure Glass ionomer. Caries removal was assessed clinically by tactile and visual method (Ericson criteria). Time taken for the procedure was measured in minutes. Evaluation of pain perception was done using the Wong-Baker facial image. Microbiological evaluation was done by collecting dentin samples from the carious primary tooth before and after caries removal and total bacterial count was assessed. The restoration was evaluated using the United States Public Health Service (USPHS) at baseline, three months, six months and nine months. Results: The two groups showed a statistically significant difference (unpaired t test) in the time of treatment, Pain score and total bacterial count. Clinical evaluation of the restoration using the modified USPHS criteria showed no statistical significance between the two groups. Conclusion: Chemo-mechanical caries removal methods and laser irradiation are effective and efficient techniques for caries removal in children with high patient acceptance and no adverse effects.

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“…Bone is mainly composed of collagen and hydroxyapatite [18]. Both components show higher absorption at 355 nm than at 1064 nm wavelengths, with collagen having an absorption maximum near 355 nm [19,20,21,22]. To do the study, we selected two laser sources: One emitting at 355 nm, corresponding to the absorption peak of collagen, and with a pulse duration in the ns regime associated with a more thermic process; and the other emitting at 1064 nm, where the absorption coefficient is lower but pulsed in the ps regime.…”

Section: Introductionmentioning

confidence: 99%

Thermal Effects in the Ablation of Bovine Cortical Bone with Pulsed Laser Sources

et al. 2019

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Lasers have advantages as bone surgical tools over mechanical methods, but two goals should be achieved to assure its use: Similar ablation rates to those obtained with mechanical tools (1 mm3/s at least) and to avoid thermal damage, a condition that can prevent proper bone healing. We present results of cow femoral bone with a 355 nm nanosecond (ns) and a 1064 nm picosecond (ps) pulsed laser sources that allow us to discuss the influence on the process of pulse duration and the selective ablation through high energy absorption (as bone highly absorbs 355 nm radiation). The treated samples were characterized by scanning electron microscopy (SEM) and Raman spectroscopy. The evaluation of the thermal effects produced in the samples shows clear differences between both laser sources: On one hand, the ns laser allows reaching high ablation rates (around 1 mm3/s); Raman spectra show no signal of bone carbonization, but unavoidable thermal effects in the form of melted and solidified material have been observed by electron microscopy in the samples treated with this laser. On the other hand, ablation without any sign of thermal effects is obtained using the ps laser, but with lower ablation rates, (around 0.15 mm3/s).

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Laser Technology for Caries Removal

Cited by 5 publications

References 71 publications

Monte Carlo and Tissue-Phantom studies of Photoacoustic Imaging of Carotid Intraplaque Haemorrhage

Monte Carlo and Tissue-Phantom studies of Photoacoustic Imaging of Carotid Intraplaque Haemorrhage

Comparative Study of Erbium Laser Versus A Chemo-Mechanical Caries Removal Method in Primary Teeth

Thermal Effects in the Ablation of Bovine Cortical Bone with Pulsed Laser Sources

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