Comparison of surface roughness of CAD/CAM hybrid ceramic crown restorations after milling and mechanical polishing

Yıl 2021, Cilt: 14 Sayı: 1, 125 - 132, 30.04.2021

Ece İrem Oğuz

https://doi.org/10.26559/mersinsbd.874496

Öz

Aim: The aim of this study was to compare the surface roughness of crowns fabricated from two different hybrid blocks after milling and mechanical polishing. Method: Twenty-six single crowns were milled from two different CAD/CAM hybrid blocks (nano-ceramic: NC and polymer-infiltrated ceramic: PIC) by using the same STL data (n= 13). Surface roughness (Ra) values of crowns were measured via profilometer at baseline. Then, all crowns were polished with a two-step polishing set and a diamond paste. After mechanical polishing, surface roughness (Ra) values were obtained by a profilometer. The statistical analysis of the data was performed by Student’s and paired t-tests (α= 0.05). Results: The baseline mean Ra values for NC and PIC crowns were 0.86 and 1 µm, respectively, and were not statistically different (p > 0.05). After mechanical polishing, the average Ra values of both groups decreased significantly and were obtained as 0.29 for NC group and 0.3 for PIC group (p < 0.05). There was no statistically significant difference between the mean Ra values of PIC and NC after polishing (p > 0.05). Conclusion: The surface roughness values of the crowns milled from CAD/CAM hybrid blocks did not differed according to the hybrid block type used. However, after the mechanical polishing, the surface roughness of both CAD/CAM hybrid crowns decreased compared to the baseline. Clinicians can reduce the surface roughness of the crowns fabricated from hybrid blocks by using mechanical polishing.

Anahtar Kelimeler

CAD/CAM, Dental crown, polishing, Prosthodontics, Surface properties

CAD/CAM hibrit seramik kron restorasyonlarının kazıma ve mekanik bitim-parlatma işlemi sonrası yüzey pürüzlülüklerinin karşılaştırılması

Öz

Amaç: Bu çalışmanın amacı iki farklı CAD/CAM hibrit bloktan kazınarak elde edilen kronların freze sonrası başlangıç ve mekanik bitim-parlatma işlemi sonrası yüzey pürüzlülüklerinin karşılaştırılmasıdır. Yöntem: Yirmi altı adet kron aynı STL data kullanılarak, iki farklı CAD/CAM hibrit bloktan (nano-seramik: NS ve polimer-infiltre seramik: PIS) kazınarak elde edildi (n= 13). Kronların başlangıç (freze sonrası) yüzey pürüzlülük (Ra) değerleri profilometre cihazı ile ölçüldü. Ardından tüm kronlar, iki aşamalı polisaj lastik seti ve elmas dolduruculu pat ile parlatıldı. Mekanik bitim-parlatma işlemi sonrası pürüzlülük değerleri yine profilometre cihazı kullanılarak elde edildi. Her gruptan birer örnek yüzey görüntüleme analizi için taramalı elektron mikroskobu ile incelendi. Elde edilen verilerin istatistiksel analizi Student’s ve eşleştirilmiş t-testleri kullanılarak yapıldı (α= 0.05). Bulgular: NS ve PIS kronların başlangıç ortalama Ra değerleri sırasıyla 0.86 ve 1 µm olarak elde edilmiş olup aralarında istatistiksel olarak anlamlı bir fark bulunmadı (p > 0.05). Mekanik bitim-parlatma işlemi sonrası her iki grubun ortalama Ra değeri anlamlı derecede düşüş gösterdi ve NS grubu için 0.29 PIS grubu için ise O.3 olarak elde edildi (p < 0.05). Bitim-parlatma işlemi sonrası PIS ve NS grupları için elde edilen ortalama Ra değerleri arasında istatistiksel açıdan anlamlı bir fark tespit edilmedi (p > 0.05). Sonuç: CAD/CAM hibrit bloklardan kazınan kronların yüzey pürüzlülük değerleri hibrit bloğun çeşidine göre farklılık göstermemiştir. Buna karşın her iki CAD/CAM hibrit kronun mekanik bitim-parlatma işlemi sonrası yüzey pürüzlülüğü freze sonrası başlangıç durumuna göre azalmıştır. Klinisyenlerin mekanik bitim-parlatma işlemi ile hibrit bloklardan elde edilen kronların yüzey pürüzlülüklerini azaltması mümkündür.

Anahtar Kelimeler

Dental kron, Polisaj, Prostodonti, Yüzey özellikleri, CAD/CAM

Kaynakça

• 1. Rekow ED. Dental CAD/CAM systems: a 20-year success story. J Am Dent Assoc. 2006;137 Suppl:5S-6S.
• 2. Baroudi K, Ibraheem SN. Assessment of chair-side computer-aided design and computer-aided manufacturing restorations: a review of the literature. J Int Oral Health. 2015;7(4):96-104.
• 3. Furtado de Mendonca A, Shahmoradi M, Gouvea CVD, De Souza GM, Ellakwa A. Microstructural and mechanical characterization of CAD/CAM materials for monolithic dental restorations. J Prosthodont. 2019;28(2):e587-e594.
• 4. Lawson NC, Bansal R, Burgess JO. Wear, strength, modulus and hardness of CAD/CAM restorative materials. Dent Mater. 2016;32(11):e275-e283.
• 5. Krejci I, Daher R. Stress distribution difference between Lava Ultimate full crowns and IPS e.max CAD full crowns on a natural tooth and on tooth-shaped implant abutments. Odontology. 2017;105(2):254-256.
• 6. Coldea A, Swain MV, Thiel N. Mechanical properties ofpolymer-infiltrated-ceramic-network materials Dent Mater. 2013;29:419–26.
• 7. Mota EG, Smidt LN, Fracasso LM, Burnett LH, Spohr AM. The effect of milling and postmilling procedures on the surface roughness of CAD/CAM materials. J Esthet Restor Dent. 2017;29(6):450-458.
• 8. Bollen CM, Lambrechts P, Quirynen M. Comparison of surface roughness of oral hard materials to the threshold surface roughness for bacterial plaque retention: a review of the literature. Dent Mater. 1997;13(4):258-269.
• 9. Ikeda M, Matin K, Nikaido T, Foxton RM, Tagami J. Effect of surface characteristics on adherence of S. mutans biofilms to indirect resin composites. Dent Mater J. 2007;26(6):915-923.
• 10. Al-Shammery HA, Bubb NL, Youngson CC, Fasbinder DJ, Wood DJ. The use of confocal microscopy to assess surface roughness of two milled CAD-CAM ceramics following two polishing techniques. Dent Mater. 2007;23(6):736-741.
• 11. Preis V, Behr M, Handel G, Schneider-Feyrer S, Hahnel S, Rosentritt M. Wear performance of dental ceramics after grinding and polishing treatments. J Mech Behav Biomed Mater. 2012;10:13-22.
• 12. Yilmaz C, Korkmaz T, Demirkoprulu H, Ergun G, Ozkan Y. Color stability of glazed and polished dental porcelains. J Prosthodont. 2008;17(1):20-24.
• 13. de Jager N, Feilzer AJ, Davidson CL. The influence of surface roughness on porcelain strength. Dent Mater. 2000;16(6):381-388.
• 14. Anusavice KJ, Kakar K, Ferree N. Which mechanical and physical testing methods are relevant for predicting the clinical performance of ceramic-based dental prostheses? Clin Oral Implants Res. 2007;18 Suppl 3:218-231.
• 15. Tekce N, Fidan S, Tuncer S, Kara D, Demirci M. The effect of glazing and aging on the surface properties of CAD/CAM resin blocks. J Adv Prosthodont. 2018;10(1):50-57.
• 16. Fasbinder DJ, Neiva GF. Surface evaluation of polishing techniques for new resilient cad/cam restorative materials. J Esthet Restor Dent. 2016;28(1):56-66.
• 17. Matzinger M, Hahnel S, Preis V, Rosentritt M. Polishing effects and wear performance of chairside CAD/CAM materials. Clin Oral Investig. 2019;23(2):725-737.
• 18. Rosenstiel SF, Land MF, Fujimoto J. Contemporary fixed prosthodontics. 5th ed. St. Louis: Mosby; 2016. p. 184-208.
• 19. Muhlemann S, Bernini JM, Sener B, Hammerle CH, Ozcan M. Effect of aging on stained monolithic resin-ceramic CAD/CAM materials: quantitative and qualitative analysis of surface roughness. J Prosthodont. 2019;28(2):e563-e571.
• 20. Della Bona A, Corazza PH, Zhang Y. Characterization of a polymer-infiltrated ceramic-network material. Dent Mater. 2014;30(5):564-569.
• 21. Egilmez F, Ergun G, Cekic-Nagas I, Vallittu PK, Lassila LV. Comparative color and surface parameters of current esthetic restorative CAD/CAM materials. J Adv Prosthodont. 2018;10(1):32-42.
• 22. Acar B, Egilmez F. Effects of various polishing techniques and thermal cycling on the surface roughness and color change of polymer-based CAD/CAM materials. Am J Dent. 2018;31(2):91-96.
• 23. Tekçe N, Fidan S, Tuncer S, Kara D, Demirci M. The effect of glazing and aging on the surface properties of CAD/CAM resin blocks. J Adv Prosthodont. 2018;10(1):50-57.
• 24. Dikici B, Başaran E, Can E. The effect of surface preparation methods on the surface roughness of resin based, polymer infiltrated ceramic and feldspatic CAD/CAM materials. Yeditepe J dent. 2020;16 (2);129-136.
• 25. Jones CS, Billington RW, Pearson GJ. The in vivo perception of roughness of restorations. Br Dent J. 2004;196(1):42-45.