Comparison of two Preparation Designs of Shoulder and Chamfer on the Fracture Resistance of Feldespatic Crown Made with CAD/CAM

Document Type : Original Article

Authors

1 Assistant Professor of Odontología Operativa.Department of Operative and Esthetic Dentistry, Dental School, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.

2 Resident of Odontología Operativa.Department of Operative and Esthetic Dentistry, Dental School, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.

Abstract

Background and Objective: One of the most important evaluations of fixed restoration is their strength and resistance to fracture which has important role on their longevity and performance. The aim of this in vitro study was to evaluate the effect of two different preparation designs (shoulder and chamfer) on the fracture resistance of feldespatic crowns made with CAD/ CAM. 
Materials and Methods: This study was undertaken using 20 machined stainless steel dies (10 samples for chamfer and 10 samples for shoulder) with 7 mm height, 5 mm diameter and 10´ axial walls canvergency in two finish line designs of 50´ chamfer (0.8 mm depth) and 90´ shoulde (1 mm depth). Twenty impressions were taken using a polyvinylsiloxane and poured with vacuum–mixed type 4 dental stone. Twenty first premolar feldespatic (cerec blocs) crowns were made with CAD/CAM. Each crown was cemented on its definitive stainless steel dye with clearfil SA luting and underwent a fracture test with a universal testing machine.
Results: The mean value of fracture resistance for chamfer margins were 771.40 99.47 N and for the shoulder margins were 782.30129.40 N. The student’s t- test did not reveal a statistically significant different between two groups (P=0.835)
Conclusion: The results indicate that marginal design of the feldespatic crowns do not effect their fracture resistance and selection of finish line designs should be based on clinical condition of the restored tooth.
 
 

Keywords

References

 

1-Karatasli O, Kursoglu P, Capa N.  Comparison of the marginal fit of different coping materials & designs producted by CAM systems.  Dent Mater J 2011; 26: 520-5.
2-Hyun-soon Pak, Jung-Suk Han.  Influence of porcelain veneering on the marginal fit of Digident & Lava CAD/CAM zirconia ceramic crowns.  Adv Prosthodont J 2010; 2:33-38.
3-Miyazaki T, Hotta Y, Kunii J, Kuriyama S, Tamaki Y.  A review of dental CAD/CAM: current status and future perspectives from 20 years of experience. Dent Mater J 2009; 28(1):44-56.
4-www. Inlab. Com/ ecomaxl/ CEREC-BLOCK –Instructions. Pdf.
5-Shilingburg HT,Sther DA,Wilson EL,Cain JR,Mitchell DL,Blanco LJ et al.Fundamentals Of Fixed Prosthodontics;2012.
6-Sakaguchi RL, Powers JM.Craigˊs Restorative Dental Materials.13th ed.philadelphia: Mosby; 2012.
7-Summit JB,Robbins JW,Hilton TJ,Schwartz RS.Fundamentals of Operative Dentistry.3th ed.chicago:Quintessence;2006.
8-Sakaguchi RL, Powers JM.Fundamental of materials science.in,Dolan JJ(ed). Craigˊs Restorative Dental Materials, 13th ed.philadelphia, Mosby, 2012; 33-81.
9-Aboushlib MN. Fatique and fracture resistance of ziroconia crown prepared with different finish line designs. J prosthodont 2012; 21(1):22-27.
10-E jalalian, B Atashkar, R Rostami. The effect of prepration design on the fracture resistance of zirconia crown copings (computer Associated design/computer Associated machine, CAD/CAM system). J of dentistry 2011; 8(3):123-129.
11-E Jalalian,R Rostami,B Atashkar.Comparision of chamfer and deep chamfer preparation designs on the fracture resistance of zirconia core restorations.J of Dent Research,Dent Clinics ,Dent Propects2011;5(2):41-45.
12-Jallalian E,Aletaha Ns. The effect of two marginal designs (chamfer and shoulder) on the fracture resistance of all ceramic restorations, in ceram: an invitro study. J prosthodont Res 2011; 55(2):121-5.
13-Maghrabi AA,Ayad MF,Garcia-GodoyF. Relatonship of margin design for fiber-reinforced composite crowns to compressive fracture resistance. Jprosthodont 2011; 20(5):355-60.
14-Salah M,Mahallawi O,Alla LK.Effect of different finish lines and technique of fabrication on the marginal adaptation and fracture resistance of al-ceramic crown coping.Egyptian dental association 2010;56(3):1759.
15-Beuer F, Aggstaller H, Edelhoff D and Gernet W. Effect of prepration desigon on the fracture resistance of ziroconia crown copings. Dental materials J 2008; 27(3):362-367.
16-Di Lorio D,Murmura G ,Orsini S ,scarano A. Effect of marginal  design on the fracture resistance of procera all ceram cores: an invitro study. J contep Dent pract 2008; 19(2):1-8.
17-CHO L,choi J,Yiypark Cj. Effect of finish line variants on marginal accuracy and fracture strength Of ceramic optimized polyer/fiber-reinforced composite crowns. J prosthet dent2004; 91(6):554-60.
18-Gavelis JR, Mornecy JD, Riley ED and Sozio RB .The effect of various finish line preparation on the marginal seal and occlucal seat of full crown preparations. J of Prosthet Dent1981; 45(2):138-145.
19-Komine F, Iwai T, Kabayashi K, Matsumura H.Marginal and internal adaptation of zirconium dioxide ceramic coping and crowns with Different finish line Design. Dental Material J2007; 26(5):659-664.
20-Sundh A, Molin M, Sjogren G. fracture resistance of yttrium oxide partially-stabilized ziroconia all-ceramic bridges after veneering and mechanical fatigue testing. Dental material J2005; 21(5): 476-482.
21-Scherre SS, De Rijk WG .The fracture resistence of all ceramic crowns on supporting structures with different elastic moduli. International J of prosthodont1993; 6(5):462-567.
22-Cho H-O, Kang D-W .Marginal fidelity and fracture strength of IPs- Empress Ceramic crown according to different cement types. J of Korean Academy of Prosthodont2002; 40(6):545-560.
23-Bernal G, Maric Jones R, Brown DT et al .The effect of finish line form and luting agent and the breaking strength of dicor crowns.  International J of Prosthodont1993; 6(3):286-290.
24-Akbar JH, Patrie CS, Walker MP et al. marginal adaptation of cerec 3 CAD/CAM composite crowns using two differen finish line preparation designs. J of Prosthodont2006; 15(3):155-163.
25-Quintas AF, Oliveria F, Bottino MA .vertical marginal discrepancy of ceramic coping, with different ceramic materials, finish lines, and luting agents: an in vitro evaluation. Jl of Prosthet Dentistry2004; 92(3):250-257.
26-Mormann WH, Bindl A.The New creativity in ceramic restorations: dental CAD/CAM. Quinte Ssence International1996; 27(12):821-828.
27-Kamada K , Yashida K , Atusa M.Effect of ceramic surface treatments on the bond of for resin luting agents to a ceramic material. The J of prosthet Dent1998; 79(5):508-513.
28-Kao EC, Johnston WM .Fracture incidence on debonding of orthodontic brackets from porcelain veneer laminates. The J of Prosthet Dent1991; 66(5):631-637.
29-Diaz-Arnold AM, Vargas MA, Haselton DR.Current status of luting agents for fixed prosthodantics. The J of Prosthet Dent1999; 81(2):135-141.
30-Chen HY, Hickel R, Setcos JC and Kunzelmonn KH.Effects of surface finish and fatigue testing on the fracture strength of CAD/CAM pressed- cermic crowns. The J of Prosthet Dent1999; 82(4):468-475.
31-Kelly JR.Clinically relevant approach to failure testing of all-ceramic restorations.The Jof Prosthet Dent1999; 81(6):652-661.
Jundishapur Scientific Medical Journal
Volume 16, Issue 4 - Serial Number 109
September and October 2017
Pages 483-491

Files

History

  • Receive Date: 05 March 2017
  • Revise Date: 15 April 2017
  • Accept Date: 21 March 2017

Share

How to cite

Statistics