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Int Poster J Dent Oral Med 4 (2002), No. 3     15. Sep. 2002

Int Poster J Dent Oral Med 2002, Vol 4 No 3, Poster 135

Microleakage of class I composites with different base materials

Language: English

Authors: PD Dr. Thomas Pioch1, Daniel Kraft1, Prof. Dr. Franklin Garcia-Godoy2, Dr. Ulrich Koke3, Prof. Dr. Dr. Hans Jörg Staehle1, PD Dr. Christof Dörfer1
1Universitätsklinikum Heidelberg, Poliklinik für Zahnerhaltungskunde
2Tufts University at Boston
3Poliklinik für Zahnärztliche Prothetik, Heidelberg

Date/Event/Venue: 
07.09.2001
IADR-CED
Rome/Italy

Purpose

To test the effect of different base materials on marginal quality of composite restorations after load cycling in vitro. 


Materials and Methods

Standardized Class I cavities were prepared in 110 extracted human molars. The teeth were randomly assigned to 10 groups (n=11 in each group). Cavities of 8 groups were filled with composite (Tetric ceram) using different base materials or cotton as negative control. Restorations of three more groups were restored without base materials using a composite, a compomer or an ormocer, respectively. All specimens were subjected to a thermomechanical cycling process of 1000 stress cycles (0/100N) and 1000 temperature cycles (5 °C / 55 °C). After dye penetration with rhodamin, the teeth were embedded, sectioned and examined by conventional stereomicroscopy (SMi) and by confocal laser scanning microscopy (CLSM).

   Grading of the dye penetration:
   0: max 0.1 mm
   1: max to enamel-dentin junction
   2: max to bottom of cavity
   3: including bottom of cavity 


Results

With both microscopic methods used, significant differences between the experimental groups were found (Kruskal-Wallis-Test: SMi p=0.02, CLSM p=0.001). Comparing the two microscopical methods it can be stated, that CLSM is more sensitive than SMi. Highest penetration values were detected at the negative control (group J, mean rank: SMi 139, CLSM 161). Under SMi lowest values were found for the all compomer restoration (group F, mean rank: 83) and for one restoration with a glasionomer used as base material (group E, mean rank: 95). With CLSM lowest values were found for the combination of glasionomer and composite (group C, mean rank: 84) and for the all ormocer restorations (group I, mean rank: 93). 


Group Restorations  Mean rank of penetration 
(Kruskal-Wallis-Test)
   Base materials   Restoration 
materials
 Bonding agents   Stereomicroscope  Confocal Laser
 Scanning Microscope 
A Harvard Cement Tetric Ceram Excite 92 108
B Ketac-Bond Tetric Ceram Excite 99 95
C GC Fuji IX GP Tetric Ceram Excite 124 84
D Ketac-Molar Tetric Ceram Excite 125 124
E Compoglass Tetric Ceram Excite 95 99
F Dyract AP P&NT 83 95
G Tetric Ceram Excite 126 125
H Tetric Flow Tetric Ceram Excite 103 122
I Admira Admira Bond 118 93
J Cotton Tetric Ceram Excite 139 161
        p = 0,020 p = 0,001
Table 1: Test groups and their mean ranks of penetration.


Conclusion

It is concluded that variations of individual base materials might influence the marginal characteristics of Class I composite restorations. 


Fig. 1a: Frequency of dye penetration depths (stereomicroscopy)   Fig. 1b: Frequency of dye penetration depths (confocal laser scanning microscopy)

Fig. 2: CLSM image in reflection (left) and reflection (right) mode from a specimen of group C. A dye penetration between restorative material and enamel did not occur (here grade 0). E = embedding resin.

Fig. 3: CLSM image in reflection (left) and reflection (right) mode from a specimen of group J. A dye penetration (arrows) between restorative material and enamel occurred (here grade 1).

Fig. 4: CLSM image in reflection (left) and reflection (right) mode from a specimen of group I (negativ control). A dye penetration (arrows) between restorative material and enamel occurred (here grade 2).

This poster was submitted by PD Dr. Thomas Pioch.

Correspondence address:
PD Dr. Thomas Pioch
Universitätsklinikum Heidelberg
Poliklinik für Zahnerhaltungskunde
Im Neuenheimer Feld 400
D-69120 Heidelberg