Lamina Veneer Preparasyon Derinliklerinin 3B Sistemler ile Değerlendirilmesi

Abstract

Giriş: Lamina veneer restorasyonlarında preparasyon derinliği, yapısal sağlamlığın ve tutuculuğun sağlanmasında temel faktörlerin başında gelir. Bu çalışmanın amacı, deneyimli bir prostodontist (PP) ve yüksek lisans protodonti öğrencisinin (PPS) lamina preparasyon derinliklerinin, preparasyon öncesinde ve sonrasında 3B tarayıcı ile farklılıklarının değerlendirilmesidir.

Gereç ve yöntemler:PP ve PPS 20 adet çekilmiş insan maksiller santral kesiciyi değerlendirmiştir. Fasiyel preparasyon için 0,5 mm’lik derinlik rehberli frez kullanılmıştır. İnsizal preparasyon için ise 1 mm’lik champher frez kullanılmıştır. Dişler, 10 µm hassasiyetinde lazer tarayıcı ile taranmıştır. Dişler 3 kısıma (insizal, orta ve servikal) bölünmüş ve 5 noktadan incelenmiştir. Preparasyon yapılmamış ve yapılmış dişler üst üste çakıştırılarak Magics (Materialise NV, Belgium) 3B tarama yazılımında  aralarındaki farklar incelenmiştir. İstatistiksel analiz tek yünlü ANOVA ile yapılmıştır (p < 0.05).

Bulgular: PP sonuçları ortalama insizalde 0.328+0.045 mm, ortada 0.375+0.097 mm, servikalde ise 0.471+0.07 mm olurken, PPS sonuçları ortalama insizalde 0.323+0.056 mm, ortada 0.403+0.083 mm ve servikalde 0.462+0.075 mm olarak bulunmuştur.

Sonuç: Bu sonuçlar, derinlik belirleyici frez kullanıldığında PP ve PPSbenzer preparasyon hassasiyet gösterdiğini belirtmektedir.

Anahtar kelimeler: Seramik lamina veneer preparasyonu, 3B tarama, derinlik belirleyici frez

Keywords

• Seramik lamina veneer preparasyonu,, 3B tarama,derinlik belirleyici frez

Evaluation of Laminate Veneer Preparation Depth with 3D Systems

Abstract

Background:Preparation depth of laminate veneers are essential in retention and structural integrity of restorations. The aim of this study was to evaluate the difference between a trained professional prosthodontist (PP) and a postgraduate prosthodontics student (PPS) in the preparation depth of laminate veneers by scanning the tooth with a 3D scanner before and after the preparation. 

Methods: Twenty extracted human maxillary central incisors were evaluated by a PP and PPS. A 0.5 mm depth guide bur was used in for facial reduction and a 1 mm incisal reduction was performed with a deep chamfer. The teeth were scanned with a laser scanner at an accuracy of 10 µm.The teeth were separated into 3 parts (incisal, middle and cervical) and then 5 points were randomly selected on the unprepared tooth and then lapped over when the preparation had been completed. The data of the difference was calculated in 3D scanning software Magics (Materialise NV, Belgium).Statistical analysis were performed with one-way ANOVA (p < 0.05).

Results: PP results showed mean values in the Incisal of 0.328+0.045 mm, Middle of 0.375+0.097 mm and Cervical of 0.471+0.07 mm. PPS results showed mean values in the Incisal of 0.323+0.056 mm, Middle results of 0.403+0.083 mm and Cervical results of 0.462+0.075 mm.

Conclusion: These results suggest that a PP or a PPS can both achieve the same precision in there preparation using a depth guide bur. 

Key Words: Ceramic laminate veneer preperation, 3D scanning, depth guide bur.

Keywords

• Ceramic laminate veneer preperation,3D scanning,depth guide bur

References

1. 1. Akoğlu B, Gemalmaz D. Fracture resistance of ceramic veneers with different preparation designs. J Prosthodont. 2011;20(5): 380–384.
2. 2. Aristidis GA, Dimitra B. Five-year clinical performance of porcelain laminate veneers. Quintessence Int. 2002;33: 185–189.
3. 3. Beier US, Kapferer I, Burtscher D, Dumfahrt H. Clinical performance of porcelain laminate veneers for up to 20 years. J Prosthodont. 2012;25: 79–85.
4. 4. Brunton PA, Aminian A, Wilson NH. Tooth preparation techniques for porcelain laminate veneers. Br Dent J. 2000;189(5): 260–262.
5. 5. Castelnuovo J, Tjan AHL, Phillips K, Nicholls JI, Kois JC. Fracture load and mode of failure of ceramic veneers with different preparations. J Prosthet Dent. 2000;83: 171-180.
6. 6. Cherukara GP, Seymour KG, Samarawickrama DYD, Zou L. A study into the variations in the labial reduction of teeth prepared to receive porcelain veneers- a comparison of three clinical techniques. Br Dent J. 2002;192: 401-404.
7. 7. Cherukara GP, Seymour KG, Zou L, Samarawickrama DYD. Geographic distribution of porcelain veneer preparation depth with various clinical techniques. J Prosthet. Dent. 2003;89: 544-550.
8. 8. Ferrari M, Patroni S, Balleri P. Measurement of enamel thickness in relation to reduction for etched laminate veneers. Int J Periodontics Restorative Dent. 1992;12: 407–413.

9. 9. Durán Ojeda G, Henríquez Gutiérrez I, Guzmán Marusic Á, Báez Rosales A, Tisi Lanchares JP. A Step-by-Step Conservative Approach for CAD-CAM Laminate Veneers. Case Rep Dent. 2017;2017:3801419.
10. 10. Subaşı MG, Alp G, Johnston WM, Yilmaz B. Effect of thickness on optical properties of monolithic CAD-CAM ceramics. J Dent. 2018;71:38-42.
11. 11. Coachman C, Gurel G, Calamita M, Morimoto S, Paolucci B, Sesma N. The influence of tooth color on preparation design for laminate veneers from a minimally invasive perspective: case report. Int J Periodontics Restorative Dent. 2014;34(4):453-9.
12. 12. Tuğcu E, Vanlıoğlu B, Özkan YK, Aslan YU. Marginal adaptation and fracture resistance of lithium disilicate laminate veneers on teeth with different preparation depths. Int J Periodontics Restorative Dent. 2018;38:87–95.
13. 13. Garber DA, Goldstein RE, Feinman RA. Porcelain Laminate Veneers. Quintessence Publ.; 1988, p: 11-13, 36-50.
14. 14. Hahn P, Gustav M, Hellwig E. An in vitro assessment of the strength of porcelain veneers dependent on tooth preparation. J. Oral Rehabil. 2000;27: 1024-1029.
15. 15. Hui KKK., Williams B, Davis EH, Holt RD. A comparative assessment of the strengths of porcelain veneers for incisor teeth dependent on their design characteristics. Br Dent J. 1991;171: 51-55.
16. 16. Magne P, Belser UC. Bonded Porcelain Restorations in the Anterior Dentition-a Biomimetic Approach. Quintessence Publ; 2002, p:14-19.
17. 17. Nattress BR, Youngson CC, Patterson CJW, Martin DM, Ralph JP. An in vitro assessment of tooth preparation for porcelain veneer restorations. J Dent. 1995;23: 165-170.
18. 18. Peumans M, Van Meerbeek B, Lambrechts P, Vanherle G. Porcelain veneers: a review of the literature. J Dent. 2000;28: 163–177.
19. 19. Radz GM. Minimum thickness anterior porcelain restorations. Dent Clin North Am. 2011;55: 353–370.
20. 20. Sheets CG, Taniguchi T. Advantages and Limitations in the use of Porcelain Laminate Veneers. J Prosthet Dent. 1990;64: 406-411.
21. 21. Troedson M, Derand T. Effect of margin design, cement polymerization, and angle of loading on stress in porcelain veneers. J Prosthet Dent. 1999;82: 518-524.
22. 22. Toksavul S, Ulusoy M, Yılmaz G. Tüm Seramik Kronlar. Ege Üni. Dişhekimliği Fakültesi Der. 1993;14: 21-26.
23. 23. Uludağ B, Gürbüz A. Porselen Laminate Veneer Preparasyonlarında Oluşan Streslerin Analizi. Ankara Üni. Dişhekimliği Fakültesi Der. 1990;17: 227-232.
24. 24. Walls AWG. The use of adhesively retained all-porcelain veneers during the management of fractured and worn anterior teeth: Part 2. Clinical results after 5 years of follow-up. Br Dent J. 1995;178: 337–340.
25. 25. Walls AWG, Steele JG, Wassell RW. Crowns and Other Extra-coronal Restorations: Porcelain Laminate Veneers. Br Dent J. 2002;193: 73-82.
26. 26. Weinberg LA. Tooth preparation for porcelain laminates. NY Dent J. 1989;55: 25–28.
27. 27. Zhang F, Heydecke G, Razzoog M. Double-layer Porcelain Veneers: Effect of Layering on Resulting Veneer Color. J Prosthet Dent. 2000;84: 425-432.