Marginal Adaptation of All-Ceramic Crowns Using Different Luting-Cements BEHR M, Rosentritt M, LANG R, REGNET T*, HANDEL G.

Department of Prosthetic Dentistry, University of Regensburg, Germany

Objectives: the aim of this in-vitro study was to examine the marginal adaptation of all-ceramic single crowns to dentin using composite-, compomer- and two experimental self-adhesive resin cements. Methods: thirty-two human molar teeth were prepared with a 0.8 mm step and a finish line lying in dentin. All-ceramic crowns (IPS Empress2) were fabricated and luted (each n=8) with: the composite cement Variolink II/Syntac Classic (VS, Ivoclar-Vivadent), the compomer Dyract Cem Plus/Prime&Bond NT/NRC (DP, Dentsply, G) and two experimental systems (3M Espe, G) with (EB) and without bonding (E). The margins were evaluated after thermal-cycling and mechanical oral stress simulation of five years (TCML: 6000 x 5°/55 °C, H₂0, 2 min, 1.2*10⁶ x 50N). Marginal adaptation was determined using scanning electron microscopy (SEM) before and after TCML and microleakage was performed by a dye penetration test after TCML (0.5 % fuchsine solution, 16h). Statistics: Mann-Whitney-U test (p £ 0.05).

Results: the SEM analysis showed no statistically different results between the types of interface before (b) and after (a) TCML and the different luting-cements. However, the composite- and

Examination	interface	VS b/a		DP b/a		EB b/a		E b/a
Perfect margin [%]	Cement-crown	86.9	96.3	93.9	89.5	96.1	98.1	96.7	93.8
Perfect margin [%]	Cement-tooth	87.1	95.6	89.4	86.6	93.0	98.0	97.7	95.5
Microleakage [%]	Cement-crown	--	62.2	--	69.3	--	18.7	--	27.2
Microleakage [%]	Cement-tooth	--	76.8	--	75.1	--	44.9	--	20.8

compomer-cements (VS; DP) had significantly higher amounts of microleakage than the experimental systems. Conclusions: due to their very easy handling and their good marginal adaptation after stress simulation the experimental self-adhesive resin cements are promising.

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