3420 Partial ceramic crowns (Cerec 3): Marginal integrity in vitro
M. FEDERLIN, S. SCHMIDT, K.-A. HILLER, and G. SCHMALZ, University of Regensburg, Germany

Objectives: The purpose of this in vitro study was to determine the influence of preparation type and luting material on marginal integrity of Cerec 3 Vita Mk II ceramic crowns (PCC).

Methods: 108 extracted human molars were prepared for PCC: A. retentive PCC (mod-cavity, coverage of functional cusp, chamfer); B. adhesive onlay (mod-cavity, horizontal reduction of functional cusp); C. adhesive PCC (mod-cavity, complete reduction of functional cusp, chamfer). All proximal margins were placed within dentin. Restorations were inserted using two luting composites: Panavia F (PF, Kuraray), Variolink II (VL, Vivadent), and a resin modified GIC: Fuji plus (FP, GC). After 1d storage (0.9% saline solution), samples (n=12/group) were thermocycled (TC: 5000x, 8-55°C) and mechanically loaded (ML: 500000x72.5N). After TCML, marginal quality was assessed by dye penetration (0.5% basic fuchsine, 16h/37°C) and multiple sectioning. Microleakage was determined along cervical (C), occlusal (O) and vestibular (V) ceramic/luting material (Cer) and luting material/tooth (En=Enamel/De=Dentin) interfaces separately. The data were statistically evaluated with the Mann Whitney U test, Wilcoxon Rank Sum test and error rates method. Results: Dye penetration (%); 25% percentile-Median- 75% percentile:

Prep/Loc

A/O (En)

A/V (En)

A/C (De)

B/O (En)

B/V (En)

B/C (De)

C/O (En)

C/V (En)

C/C (De)

VL Cer

0-1-11

1-1-4

1-2-7

0-0-4

0-3-10

0-1-50

0-0-0

0-0-11

0-0-1

VL En/De

1-2-6

2-3-7

33-55-88

0-0-0

0-0-1

41-69-87

0-0-5

0-5-9

8-96-99

PA Cer

0-0-0

0-0-2

0-0-3

0-0-4

0-0-6

0-5-18

0-0-4

0-0-7

0-0-24

PA En/De

0-0-4

7-13-21

30-38-85

0-0-0

0-0-1

38-50-99

0-0-0

0-5-17

21-30-87

FU Cer

20-27-38

29-39-67

20-26-70

12-18-29

23-26-37

23-33-60

30-34-49

25-35-54

33-43-67

FU En/De

2-11-14

8-20-45

14-19-51

1-11-18

0-19-26

22-40-61

9-20-33

14-33-42

43-71-99

Application of the error rates method revealed statistically significant influence in general between preparation types and luting materials.

Conclusion: Generally, Cerec 3 PCC reveal increased microleakage at the cervical margin independent of luting material / preparation method.

Seq #312 - Cements, Bond Strength, Marginal Adaptation
11:00 AM-12:15 PM, Saturday, 9 March 2002 San Diego Convention Center Exhibit Hall C

Back to the Dental Materials: III - Ceramics and Cements Program
Back to the IADR/AADR/CADR 80th General Session (March 6-9, 2002)

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