Laser-Induced Temperature Changes in Dentine

Keller, O.; Weber, Franz E.; Grätz, K W; Baltensperger, M.; Eyrich, Gerold

doi:10.1089/104454703322650194

Cited by 10 publications

(5 citation statements)

References 41 publications

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“…In this study, we used a super pulsed CO 2 laser at very low energy density (less than 12.5 J/cm 2 ). Previous studies (22, 28, 29) have reported that irradiation with a CO 2 laser at very low energy did not change the surface morphology of enamel, dentin, or bone and did not influence the temperatures of pulp and the dentin surface, suggesting that irradiation with a CO 2 laser at very low energy density might decrease periodontopathic bacteria and LPS without damaging the hard tissues adjacent to the subgingival area.…”

Section: Discussionmentioning

confidence: 90%

“…The use of a pulsed CO 2 laser may decrease thermal damage (18, 20). It has been reported (21, 22) that dental pulp irradiated with a super pulsed laser for a short time showed temperature increases within physiologically acceptable limits, suggesting that the super pulsed laser does not cause thermal damage. Therefore, we hypothesized that irradiation by a super pulsed CO 2 laser at lower energy density would have few adverse effects on dental hard tissue and could safely be used in the subgingival area.…”

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confidence: 99%

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Inhibitory effects of a super pulsed carbon dioxide laser at low energy density on periodontopathic bacteria and lipopolysaccharide in vitro

Kojima¹,

Shimada

Iwasaki³

et al. 2005

J of Periodontal Research

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Section: Discussionmentioning

confidence: 90%

mentioning

confidence: 99%

Inhibitory effects of a super pulsed carbon dioxide laser at low energy density on periodontopathic bacteria and lipopolysaccharide in vitro

Kojima¹,

Shimada

Iwasaki³

et al. 2005

J of Periodontal Research

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“…Some Er:YAG laser beams could penetrate to deeper areas than the ablated area and damage the nerve fi bres and terminals, which might be a mecha nism of pain reduction in cavity ablation with the Er:YAG laser. 1 A number of authors 10,13,16,[18][19][20][21][22][23] stud ied the behaviour of different lasers to determine the amount of temperature increase during cavity preparation on dental structure. Keller et al (2003) 19 verified a mean temperature rise of 1.68ºC in the pulpal chamber using CO 2 and morphologically unaltered dentine surfaces, demonstrat ing the safe and tissue preserving char acter of the laser.…”

Section: Discussionmentioning

confidence: 99%

“…1 A number of authors 10,13,16,[18][19][20][21][22][23] stud ied the behaviour of different lasers to determine the amount of temperature increase during cavity preparation on dental structure. Keller et al (2003) 19 verified a mean temperature rise of 1.68ºC in the pulpal chamber using CO 2 and morphologically unaltered dentine surfaces, demonstrat ing the safe and tissue preserving char acter of the laser. But Malmstrom et al (2001) 21 using pulsed CO 2 laser light for soft tissue surgery found detrimental changes to oral hard tissue and to the pulp.…”

Section: Discussionmentioning

confidence: 99%

Temperature rise in cavities prepared by high and low torque handpieces and Er:YAG laser

et al. 2008

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• In this study low and high torque handpieces and Er:YAG laser did not promote an increase in intrapulpal temperature higher than 5ºC.• Even the high torque handpiece did not promote a statistically signifi cant high temperature increase.• The Er:YAG laser generated a lower temperature rise. This fact denotes the possible advantage of Er:YAG laser compared to the conventional handpieces. I N B R I E F RESEARCHObjective The aim of this study was to compare intrapulpal temperature increases produced by a high-speed high-torque (speed-increasing) handpiece, a high-speed low-torque handpiece (air-turbine) and an Er:YAG (Erbium: Yttrium-Aluminum-Garnet) laser. Subject and methods Thirty bovine incisors were reduced to a dentine thickness of 2.0 mm. Class V preparations were prepared to a depth of 1.5 mm, measured with a caliper or by a mark on the burs. A thermocouple was placed inside the pulp chamber to determine temperature increases (°C). Analysis was performed on the following groups (n = 10) treated with: G1, low-torque handpiece; G2, high-torque handpiece; and G3, Er:YAG laser (2.94 µm at 250 mJ/4 Hz), all with water cooling. The temperature increases were recorded with a computer linked to the thermocouples. Results The data were submitted to ANOVA and Tukey statistical test. The average temperature rises were: 1.92±0.80ºC for G1, 1.34±0.86ºC for G2, and 0.75±0.39ºC for G3. There were significant statistical differences among the groups (p = 0.095). All the groups tested did not have a change of temperature that exceeds the threshold of 5.5 o C. Conclusion Temperature response to the low and high torque handpieces seemed to be similar, however the Er:YAG laser generated a lower temperature rise.

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“…At present, the replacement is prohibitively expensive. In addition, studies have shown that water laser can still increase the temperature of the dental surface, pulp chamber, and soft tissue, though the water cooling significantly suppresses this effect compared to the case of the high-speed dental drill [12,13]. These shortcomings may limit the application of water lasers in health care.…”

Section: Introductionmentioning

confidence: 99%

Water jet as a novel technique for enamel drilling ex vivo

et al. 2021

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To investigate the usage of a water jet for enamel drilling ex vivo, 210 individual extracted molars without lesions or fillings were collected. Then, the specimens were drilled by a water jet or a high-speed dental drill. The cavities of 50 teeth were reconstructed digitally by micro-computed tomography (micro-CT) to measure the height and width. The cavities of 10 teeth were longitudinally incised and their surfaces were observed by scanning electronic microscopy (SEM). After the cavities were filled, 50 fillings were vertically incised. The bonding interface between tooth and filling was observed by SEM. 50 teeth with fillings were stained in 0.1% rhodamine B solution, and then the dye penetration between tooth and filling was observed under the stereomicroscope and confocal laser scanning microscopy (CLSM). The bonding strength between enamel and filling of 50 teeth was simulated and predicted with finite element analysis (FEA). At 140–150 MPa and for 2–3 s, cavities were made with a depth of approximately 764 μm in each tooth. SEM showed the cavity surface in the water jet group had a more irregular concave and convex structure than that in the high-speed dental drill group. There was a trend that the microleakage and bonding width was smaller in the water jet group than in the high-speed dental drill group. FEA indicated that the stress on the resin surface was greater than on the enamel surface in the water jet group. Compared with the tooth drilled by a high-speed dental drill, the tooth drilled by a water jet gained better retention of the filling material and suffered less bonding strength on the enamel surface. Water jet drilling is effective for enamel drilling.

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Laser-Induced Temperature Changes in Dentine

Cited by 10 publications

References 41 publications

Inhibitory effects of a super pulsed carbon dioxide laser at low energy density on periodontopathic bacteria and lipopolysaccharide in vitro

Inhibitory effects of a super pulsed carbon dioxide laser at low energy density on periodontopathic bacteria and lipopolysaccharide in vitro

Temperature rise in cavities prepared by high and low torque handpieces and Er:YAG laser

Water jet as a novel technique for enamel drilling ex vivo

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