Effects of Different Er:YAG Laser Parameters on Debonding Forces of Lithium Disilicate Veneers: A Pilot Study

Abstract

Abstract

Objectives:The aim of this study was to investigate the effects of different Er:YAG laser application parameters on shear bond strength values of all-ceramic restorations cemented to different tooth surfaces.

Materials and Methods:Thirty lithium disilicate ceramic disc specimens (thickness of 1 mm and diameter of 3 mm) were fabricated and cemented by using a dual-cure resin cement to 30 non-carious, extracted mandibular incisors, which were divided into 2 as; tooth reduction on enamel and on dentin. Six test groups (n=5) were designed according to the application method; 1st group on enamel and without laser application, 2nd group on dentin and without laser application, 3rd group on enamel and laser applied (600mJ, 2 Hz), 4th group on dentin and laser applied (600mJ, 2 Hz), 5th group on enamel and laser applied (165mJ, 30 Hz), 6th group on dentin and laser applied (165mJ, 30 Hz). The Er:YAG laser was applied on each specimen for 3 seconds. After the laser application, all groups were subjected to shear bond strength test until fracture. The failure modes were also examined. The data were statistically analyzed by using one-way ANOVA and post hoc T-test at a 0.05 level of significance. 

Results:According to one-way ANOVA test, there was statistically significant differences between the groups (p<0.05). Post hoc T-test revealed no statistically significant difference only between the groups 2 and 5. The mean shear bond strength of the specimens of group 1 was statistically higher than that of all the other groups (p<0.001).

Conclusion:Er:YAG laser-irradiation is a successful and effective application in removing ceramic veneers. When the depth of the tooth reduction amount increases, parameters such as; the frequency and energy of the laser application can be reduced for restorations with the same thicknesses.

Keywords

• Er:YAG laser
• ceramic veneer
• shear bond strength

Farklı Er: YAG Lazer Parametrelerinin Lityum Disilikat Venerlerin Çıkarılma Kuvvetlerine Etkisi: Pilot çalışma

Abstract

Özet

Amaç:Bu çalışmanın amacı, farklı Er: YAG lazer parametrelerinin, farklı diş yüzeylerine simante edilmiş tam seramik restorasyonlarda makaslama bağlanma dayanımı değerlerine etkisini araştırmaktır.

Gereç ve Yöntemler:Otuz adet lityum disilikat seramik disk (1 mm kalınlık ve 3 mm çapında) üretildi ve labial yüzeylerinde mine ve dentin seviyesinde diş preparasyonu yapılan 30 adet çekilmiş çürüksüz alt kesici dişe simante edildi. Uygulama yöntemine göre 6 test grubu tasarlanmıştır (n=5); 1. grup mine yüzeyinde ve lazer uygulanmamış, 2. grupdentin yüzeyinde ve lazer uygulanmamış, 3. grup mine yüzeyinde ve Er: YAG lazer (600mJ, 2 Hz) uygulanan, 4. grup dentin yüzeyinde ve Er: YAG lazer (600mJ, 2 Hz) uygulanan, 5. Grup mine yüzeyinde ve Er: YAG lazer (165mJ, 30 Hz) uygulanan, 6. grup dentin yüzeyinde ve Er: YAG lazer (165mJ, 30 Hz) uygulanan. Er: YAG lazer her örneğe 3 saniye boyunca uygulandı.Lazer uygulama işleminden sonra, tüm gruplar kopma oluşana kadar makaslama bağlanma dayanımı testine tabi tutuldu. Numunelerin kopma paternleri incelendi. Elde edilen veriler istatistiksel olarak tek yönlü ANOVA ve post-hoc T-test kullanılarak 0.05 anlamlılık düzeyinde analiz edildi.

Bulgular:Tek yönlü ANOVA testi sonuçlarına göre gruplar arasında istatistiksel olarak anlamlı fark elde edilmiştir (p<0.05). Post hoc T-testine göre sadece 2. ve 5. gruplar arasında istatistiksel olarak anlamlı fark olmadığını görülmüştür. Grup 1'deki örneklerin ortalama makaslama bağlanma dayanımı değerleri, diğer tüm gruplardan istatistiksel olarak daha yüksek bulunmuştur (p<0.001). 

Sonuç:Er: YAG lazer seramik venerlerin çıkarılmasında başarılı ve etkili bir uygulamadır. Aynı kalınlıktaki restorasyonlar için, diş preparasyon derinliği arttıkça, lazer uygulama frekansı ve enerjisi gibi parametreler azaltılabilir.

Keywords

• Er:YAG lazer
• seramik vener
• makaslama bağlanma dayanımı

References

1. 1. Tak O, Sari T, Malkoc MA, Altintas S, Usumez A, Gutknecht N. The effect of transmitted Er:YAG laser energy through a dental ceramic on different types of resin cements. Lasers Surg Med 2015; 47:602–607
2. 2. Gehrt M, Wolfart S, Rafai N, Reich S, Edelhoff D. Clinical results of lithium-disilicate crowns after up to 9 years of service. Clin Oral Invest 2013;17:275–284
3. 3. Morford CK, Buu NC, Rechmann BM, Finzen FC, Sharma AB, Rechmann P. Er: YAG laser debonding of porcelain veneers. Lasers Surg Med 2011;43:965–974
4. 4. Sari T, Tuncel I, Usumez A. Transmission of Er:Yag laser through different dental ceramics. Photomed Laser Surg 2014; 32:37-41
5. 5. Feldon PJ, Murray PE, Burch JG, Meister M, Freedman MA. Diode laser debonding of ceramic brackets. Am J Orthod Dentofacial Orthop 2010;138:458-462
6. 6. Oztoprak MO, Nalbantgil D, Erdem AS, Tozlu M, Arun T. Debonding of ceramic brackets by a new scanning laser method. Am J Orthod Dentofacial Orthop 2010;138:195-200
7. 7. Gurney ML, Sharples SD, Phillips WB, Lee DJ. Using an Er, Cr: YSGG laser to remove lithium disilicate restorations: A pilot study. J Prosthet Dent 2016;115:90–94
8. 8. Saito A, Namura Y, Isokawa K, Shimizu N. CO2 laser debonding of a ceramic bracket bonded with orthodontic adhesive containing thermal expansion microcapsules. Lasers Med Sci 2015;30:869-874

9. 9. Tocchio RM, Williams PT, Mayer FJ, Standing KG. Laser debonding of ceramic orthodontic brackets. Am J Orthod Dentofacial Orthop 1993;103:155–162
10. 10. Feldon PJ, Murray PE, Burch JJ, Meister M, Freedman MA. Diode laser debonding of ceramic brackets. Am J Orthod Dentofacial Orthop 2010;138:458–462
11. 11. Sarp AS, Gulsoy M. Ceramic bracket debonding with ytterbium fiber laser. Lasers Med Sci 2010; 26:577–584
12. 12. Mundethu AR, Gutknecht N, Franzen R. Rapid debonding of polycrystalline ceramic orthodontic brackets with an Er:YAG laser: an in vitro study. Lasers Med Sci 2014;29:1551-1556
13. 13. Rechmann P, Buu NC, Rechmann BM, Finzen FC. Laser all-ceramic crown removal and pulpal temperature--a laboratory proof-of-principle study. Lasers Med Sci 2015; 30:2087-2093
14. 14. Rechmann P, Buu NC, Rechmann BM, Finzen FC. Laser all-ceramic crown removal-a laboratory proof-of-principle study-phase 2 crown debonding time. Lasers Surg Med 2014; 643:636–643
15. 15. Rechmann P, Buu NC, Rechmann BM, Le CQ, Finzen FC, Featherstone JD. Laser all-ceramic crown removal-a laboratory proof-of-principle study-phase 1 material characteristics. Lasers Surg Med 2014; 46:628–635
16. 16. Van As G. Laser removal of porcelain veneers. Dent Today 2012;31:84, 86, 88–89
17. 17. Kursoglu P, Gursoy H. Removal of fractured laminate veneers with Er:YAG laser: report of two cases. Photomed Laser Surg 2013;31:41–43
18. 18. Broome PJ. Utilization of an Er, Cr:YSGG laser for the removal of all-ceramic restorations. Pract Proced Aesthet Dent 2007;19:23–25
19. 19. Cranska JP. Laser removal of all-ceramic restorations. Solving a difficult clinical challenge. Dent Today 2015;34:110–113
20. 20. Cranska JP. Removing all-ceramic restorations with lasers. Dent Today 2013;32:101-102. 104
21. 21. Kellesarian SV, Malignaggi VR, Aldosary KM. Laser assisted removal of all ceramic fixed dental prostheses: A comprehensive review. J Esthet Restor Dent 2017;30:216-222
22. 22. Iseri U, Oztoprak MO, Ozkurt Z, Kazazoglu E, Arun T. Effect of Er:YAG laser on debonding strength of laminate veneers. Eur J Dent 2014;8:58-62
23. 23. Albalkhi M, Swed E, Hamadah O. Efficiency of Er:YAG laser in debonding of porcelain laminate veneers by contact and non-contact laser application modes (in vitro study). J Esthet Restor Dent 2017; 30:223-228
24. 24. Buu N, Morford C, Finzen F, Sharma A, Rechmann P. Er:YAG laser debonding of porcelain veneers. J Laser Dent 2010;18:56
25. 25. Liu X, Wang L, Wang M, Liu L, Wang Q, Zhai J. Histomorphological effects of Nd: YAG laser for debonding ceramic brackets on rabbit pulp. Hua Xi Kou Qiang Yi Xue Za Zhi 2009;27:413-416
26. 26. Ghazanfari R, Nokhbatolfoghahaei H, Alikhasi M. Laser-aided ceramic bracket debonding: a comprehensive review. J Lasers Med Sci 2016;7:2-11
27. 27. Tozlu M, Oztoprak MO, Arun T. Comparison of shear bond strengths of ceramic brackets after different time lags between lasing and debonding. Lasers Med Sci 2012; 27:1151–1155