Microscopic Observations on Living Dental Pulp I. Method for Intravital Study of Circulation in Rat Incisor Pulp

Pohto, M; Scheinin, Arje

doi:10.3109/00016355809064115

Cited by 54 publications

(6 citation statements)

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“…However, the dentin/pulp tissues reached a temperature of 105 °C at 10 kHz and 560 °C at 200 kHz. Heat generation during this ablation procedure is known to cause irreversible nerve damage if the tooth temperature is increased by 5 °C . Therefore, these results indicate that laser ablation, even at repetition rates well below a tissue's carbonization threshold, could affect the functionality of the tooth.…”

Section: Resultsmentioning

confidence: 88%

Fs‐laser ablation of teeth is temperature limited and provides information about the ablated components

Menezes

Harvey

Gerbi

et al. 2017

Journal of Biophotonics

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The goal of this work is to investigate the thermal effects of femtosecond laser (fs-laser) ablation for the removal of carious dental tissue. Additional studies identify different tooth tissues through femtosecond laser induced breakdown spectroscopy (fsLIBS) for the development of a feedback loop that could be utilized during ablation in a clinical setting. Scanning Election Microscope (SEM) images reveal that minimal morphological damages are incurred at repetition rates below the carbonization threshold of each tooth tissue. Thermal studies measure the temperature distribution and temperature decay during laser ablation and after laser cessation, and demonstrate that repetition rates at or below 10kHz with a laser fluence of 40 J/cm would inflict minimal thermal damage on the surrounding nerve tissues and provide acceptable clinical removal rates. Spectral analysis of the different tooth tissues is also conducted and differences between the visible wavelength fsLIBS spectra are evident, though more robust classification studies are needed for clinical translation. These results have initiated a set of precautionary recommendations that would enable the clinician to utilize femtosecond laser ablation for the removal of carious lesions while ensuring that the solidity and utility of the tooth remain intact.

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Section: Resultsmentioning

confidence: 88%

Fs‐laser ablation of teeth is temperature limited and provides information about the ablated components

Menezes

Harvey

Gerbi

et al. 2017

Journal of Biophotonics

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“…At the end of the irradiation period of 40 s, the silver, blue, lemon, green, orange and pink colours of Nova Rainbow and the blue and silver shades of Twinky Star, which demonstrated lower Δ t values than the reported critical temperature increase (5.5 °C) (Zach & Cohen, 1965; Pohto & Scheinin, 1958) could be considered as reliable restorative materials. Most of the Twinky Star CCs caused an increase in intra-pulpal temperature of more than 6 °C, therefore, especially the orange, lemon or green colours of Nova Rainbow, which resulted in statistically significant lower increase in temperature than the same colours of Twinky Star, may be the choice of restorative material.…”

Section: Discussionmentioning

confidence: 93%

“…A study by Zach & Cohen (1965) in rhesus monkeys showed that 15% of the teeth developed necrosis when the healthy pulp was exposed to an increase in temperature of only 5.5 °C (Zach & Cohen, 1965). Similarly, the results of a study conducted by Pohto & Scheinin (1958) indicated that the critical temperature for irreversible damage to the pulp begins at 42–42.5 °C (Pohto & Scheinin, 1958). In another previous study performed on human teeth, it was found that short-time temperature increases in the range of 8.9–14.7 °C did not damage the pulp tissue (Baldissara, Catapano & Scotti, 1997).…”

Section: Discussionmentioning

confidence: 94%

“…The role of pulpal microcirculation in primary dentition as a cooling agent during dental procedures has not been extensively studied in the literature. In most in vitro studies, the teeth are placed in a water tank containing standing water at 37 °C (Pohto & Scheinin, 1958; Yazici et al, 2006; Mank, Steineck & Brauchli, 2011; Oberholzer et al, 2012). In the present study, in order to simulate the circulation of the pulp chamber, a pulpal circulation mechanism was created similar to the model used in previous studies (Savas et al, 2014; Ramoglu et al, 2015; Yaşa et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

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Temperature change in pulp chamber of primary teeth during curing of coloured compomers: an in vitro study using pulpal blood microcirculation model

Ertuğrul

2019

PeerJ

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Introduction An increase in the temperature of the pulp chamber occurs during polymerisation of all types of light-curing resin-containing restorative materials, due to both the exothermic reaction of the material and the energy absorbed during the curing process. Increase in temperature of the pulp chamber of primary teeth during the curing process or the thermal conductivity properties of coloured compomers (CCs) have not yet been investigated in detail. The aim of the present study was to investigate the increase in pulpal temperature in primary teeth during curing of CCs. Materials and Methods A Class-II cavity was prepared on the extracted primary mandibular second molar. Pulpal microcirculation of the tooth was performed using an experimental mechanism. The study included 15 groups and 10 experiments in each. Seven different CCs: pink, blue, gold, silver, orange, lemon, green, respectively from two different manufacturers (Groups 1–7: Twinky Star; VOCO, Cuxhaven, Germany. Groups 8–14: Nova Rainbow; IMICRYL, Konya, Turkey.) and a tooth-CC (Group 15: Dyract XP; DENTSPLY, Weybridge, UK.) were applied in prepared cavity. In all groups the compomers were light cured for 40 s. Intrapulpal temperature changes (Δt) in 20th and 40th second were recorded. In Group-15 the Δt values in 10th second were also recorded as per the manufacturer’s instructions. The Kruskal–Wallis test and the Mann–Whitney-U test were used for statistical analyses. Results At the end of 40-s irradiation time, the orange, lemon and green colours of Nova Rainbow resulted in significantly lower Δt values than the same colours of Twinky Star (p = 0.0001), and silver, blue, lemon, green, orange, and pink CCs of Nova Rainbow and the blue and silver shades of Twinky Star demonstrated lower Δt values than the reported critical temperature increase (5.5 °C). Conclusion An increase in the irradiation time consequently led to an increase in the intrapulpal temperature. Therefore, manufacturers should focus on production of new CCs with shorter polimerization time.

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“…But studies on updated restorative materials are lacking. A temperature rise of 5.5°C has been reported to damage the pulp [46,47].…”

Section: Figure 7 Surface Homogeneity Of Fr Cs Esq and Efzmentioning

confidence: 99%

The mechanical properties of nanohybrid and bulk fill posterior composites

Kamalak¹,

Canan²,

Altın³

2018

biomedicalresearch

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Objectives: The objective of this work was to investigate the structural properties, thermal conductivity, Differential Thermal Analysis (DTA), Thermo-Gravimetric analysis (TG), surface homogeneity, microhardness, X-ray analysis of nanohybrid and bulk fill composites. Methods: 108 rectangular specimens were prepared from the following composites: (Estelite Sigma Quick (ESQ), Charisma Smart (CS), 3M Espe Filtek Z 250 (EFZ) and Filtek Restorative (FR)) and subjected to various artificial aging protocols (storage in distilled water for 24 h; thermal cycling, 2 × 3000 cycles 5/55°C). The materials were light-cured for 20 s in a 2 mm × 2 mm × 6 mm teflon mould. The nanoparticles of groups were identified by FT-IR spectroscopy. Surface roughness measurements were carried out by optical microscope, the Vickers hardness number was measured with the stainless steel sheet using a micro-indentation tester (Emco Test Durascan), the heat conductivity of the samples was analyzed by the home made thermal conductivity measurement system, thermogravimetric analysis (DTG, 60-AH, Schimadzu) was used to determine the filler mass fraction. Thermogravimetric analysis was performed in argon atmosphere from 30 to 850°C. Results: It was found that the composites have multiphase component such as metallic dopant and organic binder. Conclusions: The XRD investigation showed that there was a broad halo in the pattern which indicates the organic section in the composites. We found that the temperature dependence of the thermal conductivity of the composites depended on the type of the composites, which are low enough for dental applications. The micro-hardness of the samples was analyzed and the result was compared with literature and it was found that the observed results were in agreement with literature.

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Microscopic Observations on Living Dental Pulp I. Method for Intravital Study of Circulation in Rat Incisor Pulp

Cited by 54 publications

References 1 publication

Fs‐laser ablation of teeth is temperature limited and provides information about the ablated components

Fs‐laser ablation of teeth is temperature limited and provides information about the ablated components

Temperature change in pulp chamber of primary teeth during curing of coloured compomers: an in vitro study using pulpal blood microcirculation model

The mechanical properties of nanohybrid and bulk fill posterior composites

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