Marginal adaption and nano leakage investigation of three metal ceramic inlay designs - An invitro study

Raaft Khalil, Ali Abdalla


Aims and Objectives: To evaluate the influence of metal framework design on fracture strength, marginal adaptation and nano leakage of three designs of metal ceramic inlays. Materials and Methods: Three designs for metal ceramic inlays with different metal framework extension were studied: Group A - metal extension on all cavity walls, Group B- on all cavity walls but 1.5mm below cavo-surface margin, Group C- on pulpal, axial and ginigival walls. Empress 2 all-ceramic inlays were used as controls (Group D). The fabricated inlays were cemented into standardized resin teeth using adhesive resin cement. Fracture strength was measured by applying an axial load. Marginal adaptation was evaluated using duplicate technique and scanning electron microscopy. Nano leakage was evaluated in terms of silver nitrate penetration after fatigue and thermo cycling artificial aging programs. The data were statistically analyzed using standard one-way ANOVA (p<0.05). Results: The marginal adaptation of test groups A and B were significantly lower than the other groups, 70.3 µm and 71.7 µm respectively. Group A had statistically higher fracture strength value (1287 N) compared to the other test groups. Test groups C and D had the lower silver nitrate nano leakage, 115.9 µm and 101.5 µm respectively. There was a weak negative correlation between fracture strength and marginal adaptation and between marginal adaptation and nano leakage. The extension of metallic framework affects the fracture strength, marginal adaptation and nano leakage of the metal ceramic inlays. Conclusion: In conclusion, Group A had statistically higher fracture strength value (1287 N) compared to the other test groups.


All-ceramic inlays; Fracture strength; Marginal adaptation; Metal ceramic inlays; Nano leakage


Donovan TE, Chee W. Conservative indirect restorations for posterior teeth. Cast versus bonded ceramic. Dental clinics of North America. 1993;37(3):433-43.

Seow LL, Toh CG, Wilson NH. Strain measurements and fracture resistance of endodontically treated premolars restored with all-ceramic restorations. Journal of dentistry. 2015;43(1):126-32.

Magne P, Perakis N, Belser UC, Krejci I. Stress distribution of inlay-anchored adhesive fixed partial dentures: a finite element analysis of the influence of restorative materials and abutment preparation design. The journal of prosthetic dentistry. 2002;87(5):516-28.

Edelhoff D, Spiekermann H, Yildirim M. Metal-free inlay-retained fixed partial dentures. Quintessence International. 2001;32(4):269-81.

Ausiello P, Rengo S, Davidson CL, Watts DC. Stress distributions in adhesively cemented ceramic and resin-composite Class II inlay restorations: a 3D-FEA study. Dental Materials.2004;20(9):862-72.

Saridag S, Sevimay M, Pekkan G. Fracture resistance of teeth restored with all-ceramic inlays and onlays: an in vitro study. Operative dentistry. 2013;38(6):626-34.

Smales RJ, Etemadi S. Survival of ceramic onlays placed with and without metal reinforcement. The Journal of prosthetic dentistry. 2004;91(6):548-53.

Molin M, Karlsson S. The fit of gold inlays and three ceramic inlay systems: A clinical and in vitro study. Acta Odontologica Scandinavica. 1993;51(4):201-6.

Molin MK, Karlsson SL. A randomized 5-year clinical evaluation of 3 ceramic inlay systems. International Journal of Prosthodontics. 2000;13(3):194-200.

Hayashi M, Tsubakimoto Y, Takeshige F, Ebisu S. Quantitative measurement of marginal disintegration of ceramic inlays. Operative Dentistry University of Washington. 2004;29(1):3-8.

Demarco F, Ramos O, Mota C, Formolo E, Justino L. Influence of different restorative techniques on microleakage in class II cavities with gingival wall in cementum. Operative dentistry. 2001;26(3):253-9.

Scott J, Strang R, McCrosson J. Silane effects on luting resin bond to a NiCr alloy. Journal of dentistry. 1991;19(6):373-6.

Kern M, Thompson VP. Bonding to glass infiltrated alumina ceramic: adhesive methods and their durability. The Journal of Prosthetic Dentistry. 1995;73(3):240-9.

Romao W, Miranda W, Cesar P, Braga R. Correlation between microleakage and cement thickness in three Class II inlay ceramic systems. Oper Dent. 2004;29(2):212-8.

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