Effects of laser debonding treatment on the optical and mechanical properties of all-ceramic restorations

Zhang, Mengjie; Dong, Haitao; Guo, Chunhua; Zhang, Xin; Zhang, Dingding; Wu, Xiaomin; Zhao, Juan

doi:10.1007/s10103-020-03219-4

Cited by 14 publications

(12 citation statements)

References 31 publications

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“…This tiny black spot of the crowns' surfaces might be the cause of the slight change of (△E) of these crowns. This result was in agreement with Zhang et al (37) who concluded that Er:Cr:YSGG laser changed the optical properties of dental zirconium ceramics making them lower in translucency (ΔE = 1.02).…”

Section: Groupsupporting

confidence: 93%

Effect of Laser Debonding on Color Change of Three Different Ceramic Materials

Hejazy,

Shebl,

Desoky

et al. 2023

Dental Science Updates

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Introduction:All ceramic restorations have become popular for their esthetics and durability. These restorations possess a unique biocompatibility, as well as favorable physical and mechanical properties. Debonding of ceramic restoration due to various clinical reasons may affect the shade of the restorations. Aim: This in vitro study aimed to evaluate the color change of three different all ceramic materials (Monolithic lithium disilicate material, hybrid ceramic material and monolithic translucent zirconium material) after debonding with an Erbium Chromium laser. Material and methods: Human first premolar tooth was selected for this study;. Tooth was prepared, an epoxy resin dies were duplicated from the prepared tooth, optical impression for each die, crowns were designed and Ten e-max CAD (shade A1), ten Vita Enamic (shade 1M2) and ten InCoris TZI (shade A1) crowns were milled, All the crowns were bonded to their corresponding dies;. Crowns were debonded using Er, Cr: YSGG. Shade was measured before and after debonding for each group. Results: There was a statistically significant difference in the mean ΔE in the three tested subgroups (P= 0.008) after laser debonding data was collected, tabulated and statically analyzed. Conclusion: (InCoris TZI) and (e-max CAD) crowns, can rebond and reuse after Erbium laser debonding, on the contrary of the (Vita Enamic) crowns without great change in shade.

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Section: Groupsupporting

confidence: 93%

Effect of Laser Debonding on Color Change of Three Different Ceramic Materials

Hejazy,

Shebl,

Desoky

et al. 2023

Dental Science Updates

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“…[17] Despite the success of lasers, there were reports in the literature about changes in the integrity of the removed restoration. [23][24][25] By reviewing the literature regarding laser debonding of ceramics, it seems that more research is needed on the effect of laser radiation on the debonded ceramics and accordingly the possibility of reusing them. The need for further research becomes even more pressing with the evolution of new ceramic materials.…”

Section: Introductionmentioning

confidence: 99%

Laser Debonding of ultrathin occlusal veneers fabricated from different CAD/CAM ceramic materials.

Sheikh,

Sattar,

Wahsh

2024

Preprint

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Background Erbium lasers were used to debond restorations safely offering the possibility of their re-use. Since these lasers have a high affinity for water molecules, they are absorbed by resin cement explosive ablation of the cement and thus the restoration debonds. The efficiency of this process depends on many factors including the ceramic type, its chemical composition and thickness. Therefore, this study was designed to test the time taken to debond ultrathin occlusal veneers made of three types of milled ceramic materials and evaluate the integrity of these restorations after debonding. Methods three ceramic types were evaluated in this study: Lithium disilicate (IPS Emax CAD), Highly condensed lithium disilicate (GC initial®LiSi), and translucent zirconia (Katana zirconia STML). Each group consisted of 8 occlusal veneers of 0.5 mm thickness. Samples were cemented to the occlusal surfaces of upper molar teeth. Er;Cr:YSGG laser was applied to the occlusal veneers using the scanning method and time was calculated till debonding. The debonded samples were then inspected under a stereo microscope for possible damage. Numerical data were presented as mean with 95% confidence intervals (CI), standard deviation (SD), minimum (min.) and maximum (max.) values. Normality and variance homogeneity assumptions were confirmed using Shapiro-Wilk's and Levene's tests respectively. Data were normally distributed and were analyzed using one-way ANOVA followed by Tukey's post hoc test. The significance level was set at p < 0.05 within all tests. Statistical analysis was performed with R statistical analysis software version 4.3.2 for Windows[1]. Results There was no significant difference in debonding time between different materials (p = 0.995). The longest debonding time was found in Katana STML (87.52 ± 20.45) (seconds), followed by Emax (86.94 ± 20.63) (seconds), while the lowest value was found at LiSi initial (86.14 ± 25.16) (seconds). In terms of damage to the debonded veneers, The Emax and zirconia samples showed no damage. However, 40% of the LiSi samples fractured during debonding, and 20% exhibited cracks. Only 40% of the LiSi samples were sound after debonding. Conclusion Er;Cr:YSGG laser can be used efficiently to remove ceramic occlusal veneers. However, its effect on LiSi restorations needs further research.

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“…4,5 Recent studies have shown that pulsed lasers can be used to gently remove dental prostheses. 6 Dental prostheses are often fixed with a high-strength adhesive, so removing them with conventional dentistry methods can be difficult and may damage the teeth. It has been proposed, that by using pulsed lasers focused into the thin layer of adhesive, the veneer can be removed without causing significant damage to the teeth.…”

Section: Introductionmentioning

confidence: 99%

Laser-tissue interaction of pump-probe elastography (PPE) on human teeth

Wäger,

Freymüller,

Müller

et al. 2024

Optical Elastography and Tissue Biomechanics XI

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The utilization of lasers in dentistry expands greatly in recent years. For instance, fs-lasers are effective for both drilling and caries prevention, while cw-lasers are useful for adhesive hardening. A cutting-edge application of lasers in dentistry is the debonding of veneers. While there are pre-existing tools for this purpose, there is still potential for improvement. Initial efforts to investigate laser assisted debonding mechanisms with measurements of the optical and mechanical properties of teeth and prosthetic ceramics are presented. Preliminary tests conducted with a laser system used for debonding that is commercially available showed differences in the output power set at the systems console to that at specified distances from the handpiece. Furthermore, the optical properties of the samples (human teeth and ceramics) were characterised. The optical properties of the ceramics should closely resemble those of teeth in terms of look and feel, but they also influence the laser assisted debonding technique and thus must be taken into account. In addition first attempts were performed to investigate the mechanical properties of the samples by means of pump-probe-elastography under a microscope. By analyzing the sample surface up to 20 ns after a fs-laser pulse impact, pressure and shock waves could be detected, which can be utilized to determine the elastic constants of specific materials. Together such investigations are needed to shape the basis for a purely optical approach of debonding of veneers utilizing acoustic waves.

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Effects of laser debonding treatment on the optical and mechanical properties of all-ceramic restorations

Cited by 14 publications

References 31 publications

Effect of Laser Debonding on Color Change of Three Different Ceramic Materials

Effect of Laser Debonding on Color Change of Three Different Ceramic Materials

Laser Debonding of ultrathin occlusal veneers fabricated from different CAD/CAM ceramic materials.

Laser-tissue interaction of pump-probe elastography (PPE) on human teeth

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