Microstructural changes of enamel, dentin–enamel junction, and dentin induced by irradiating outer enamel surfaces with CO2 laser

Chiang, Yu‐Chih; Lee, Bor-Shiunn; Wang, Yin‐Lin; Cheng, Ya-An; Chen, Yen-Ling; Shiau, Jia-Shyan; Wang, Da-Ming; Lin, Chun‐Pin

doi:10.1007/s10103-007-0453-y

Cited by 41 publications

(20 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It produces a decrease in acid diffusion, and alterations in organic and inorganic components of the enamel lead to increased enamel microhardness and decreased enamel susceptibility to acid. 40 Also, Daniel et al showed that CO2 laser beam was effective in the reduction of mineral loss around composite resin filling on root surfaces and CO2 laser could be a resource in the prevention of secondary caries lesions on elderly population. 33 In the current study, CPP-ACP was used alone and in conjunction with laser to treat demineralized enamel lesions.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of CO2 Laser Irradiation and CPPACP Paste Application on Demineralized Enamel Microhardness

et al. 2018

View full text Add to dashboard Cite

Introduction: It has been suggested that the application of casein phosphopeptide-amorphous calcium phosphate paste (CPP-ACP) and CO2 laser irradiation on enamel could increase the resistance of enamel to caries and acid attacks. The aim of the current study was to compare the influence of CPP-ACP paste application and irradiation of CO2 laser on microhardness of demineralized enamel. Methods: Thirty sound maxillary extracted premolars were selected. The crowns were cut at the cervical line and were split into facial and palatal halves. Specimens were mounted in selfcure acrylic blocks in such way that the enamel surface was exposed to 4×4 mm. After a pH cycling of the specimens, they were randomly divided into 4 groups (n = 15), as follows: CG: Control group, LAS: CO2 laser, CP: CPP-ACP and LASCP: laser combined CPP-ACP treatment. The Vickers microhardness of the specimens was measured (500 g load, 5 seconds, 3 points). Data were analyzed using one-way ANOVA and post hoc Tukey tests (α = 0.05). ). There were significant differences between groups (P < 0.001). The pairwise comparison of the groups revealed that there were significant differences between these groups: CG versus LAS, CP, LASCP (P < 0.05) and LASCP versus LAS and CP (P < 0.05). No significant difference between LAS group versus CP group (P > 0.05) was observed. Results Conclusion:The results of the current study revealed that CO2 laser and CCP-ACP were effective for improvement of enamel hardness value after demineralization. Incorporation of CO2 laser irradiation and CCP-ACP paste application provides additional remineralizing potential for demineralized enamel.

show abstract

Section: Discussionmentioning

confidence: 99%

“…24 In fact, the change caused by laser enhances the penetration of CCP-ACP nanocomplex into HA crystals in deeper layers. 40,45 Thus, it has higher efficacy than the application of laser or CPP-ACP alone for remineralization. …”

Section: Discussionmentioning

confidence: 99%

Influence of CO2 Laser Irradiation and CPPACP Paste Application on Demineralized Enamel Microhardness

et al. 2018

View full text Add to dashboard Cite

show abstract

“…In [14] it was shown that the use of laser radiation both independently, and in combination with the use of fluoride, reduces enamel solubility in acid and increases its microhardness. It is Brought to you by | Stockholms Universitet Authenticated Download Date | 7/13/15 1:12 AM also noted that dentin structures become denser under the action of laser radiation at subthreshold energy den sities [15]. According to modern concepts, such effects in tissues appear to be due to local heating (from 100°C to 1100°C) which leads to structural, chemical and crystal line changes in tissues [16][17][18].…”

Section: Introductionmentioning

confidence: 95%

Modification of the mechanical and chemical properties of dental enamel using Er laser radiation with sub-ablative energy density

Беликов

Skrypnik

Shatilova

2013

Photonics &Amp; Lasers in Medicine

View full text Add to dashboard Cite

Background and objective: Lasers can be successfully used for the modification of biological tissues. In den tistry, an increase in strength and the chemical pro perties of enamel with a laser in order to prevent tooth decay appears to be quite promising. We investigated microhardness and acid resistance of human tooth enamel in vitro before and after treatment by YLF:Er laser radiation with subablative energy density. Scan ning electron microscope (SEM) study of the enamel surface before and after laser treatment was carried out. A possible mechanism of the laser radiation effect on the microhardness and acid resistance of enamel is discussed. Materials and methods: Enamel of the tooth crown was investigated in vitro. A pulsed diodepumped YLF:Er laser (λ = 2.84 μm) was used operating in freerunning mode with an energy density on the enamel surface of about 2 J/cm 2 . A pattern was created on the enamel surface, every point of the pattern being formed by the impact of 100 laser pulses. Microhardness before (HV e ) and after (HV te ) laser treatment was measured by the Vickers hardness test. Microhardness of intact and lasertreated enamel were measured after mechanical cleaning with an abrasive toothpaste at room temperature to estimate the wear resistance (abrasion resistance). Gel Etchant (Kerr, Scafati, Italy) was applied to intact and lasertreated enamel. The exposure time during which intact (t e ) and treated (t te ) enamel was destroyed was determined to esti mate acid resistance. Scanning microscopy of enamel before and after laser treatment was carried out using a SEM. The original SEM image processing technique allowed us to estimate the porosity of the enamel surface before and after laser treatment. Results: The measured microhardness of intact enamel of human tooth crown was HV e = 310 ± 10, and enamel microhardness after laser treatment reached HV te = 375 ± 10. However, even after 45 min mechanical cleaning with abrasive toothpaste at room temperature, lasertreated enamel microhardness was higher than intact enamel microhardness. Measured exposure time t e was 3 ± 1 s, and the exposure time t te was 180 ± 15 s. The porosity of the intact enamel surface is almost three times greater than the porosity of lasertreated enamel. Conclusion: In this paper it was found that subablative YLF:Er laser radiation modifies the intact enamel in such a way that the enamel microhardness increases and can exceed the intact enamel microhardness by 20%. Laser treated enamel can resist abrasive impact during a time equivalent to 3 years of standard dental hygiene. Laser treated enamel can resist an external aggressive medium containing 37.5% phosphoric acid significantly longer than intact enamel. The observed improvement in the mechanical and chemical properties of the enamel can be explained by a significant reduction in enamel porosity after laser radiation impact. ZusammenfassungHintergrund und Zielsetzung: Laser können erfolgreich für die Modifikation von biologischen Geweben einge setzt werden. In der Zahnmedizin ...

show abstract

“…Outra provável explicação está na combinação de permeabilidade reduzida com menor solubilidade do substrato causada pela fusão e recristalização das microestruturas da superfície de esmalte (RODRIGUES et al, 2004;MOSHONOV et al, 2005;CHIANG et al, 2008). O conteúdo de água e carbonato do esmalte também foi descrito como reduzido quando a superfície foi irradiada com laser de CO 2 (McCORMACK et al,1995;PHAN et al, 1999).…”

Section: Discussionunclassified

“…A maior parte da luz é absorvida nos primeiros micrômetros externos da superfície do esmalte e convertida em calor (CHIANG et al, 2008). O efeito térmico do laser de CO 2 seria o responsável por aumentar a resistência do esmalte dental à ação dos ácidos (FOX et al, 1992;PHAN et al, 1999).…”

Section: Introductionunclassified

Progressão da lesão de cárie no esmalte dental após aplicação de compostos fluoretados e irradiação com laser de CO2

Souza‐Gabriel¹

View full text Add to dashboard Cite

Microstructural changes of enamel, dentin–enamel junction, and dentin induced by irradiating outer enamel surfaces with CO2 laser

Cited by 41 publications

References 22 publications

Influence of CO2 Laser Irradiation and CPPACP Paste Application on Demineralized Enamel Microhardness

Influence of CO2 Laser Irradiation and CPPACP Paste Application on Demineralized Enamel Microhardness

Modification of the mechanical and chemical properties of dental enamel using Er laser radiation with sub-ablative energy density

Progressão da lesão de cárie no esmalte dental após aplicação de compostos fluoretados e irradiação com laser de CO2

Contact Info

Product

Resources

About