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Microleakage of the experimental composite resin with three component photoinitiator systems


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Microleakage of the experimental composite resin with three component photoinitiator systems

Article information

Restor Dent Endod. 2009;34(4):333-339
Publication date (electronic) : 2009 July 31
doi : https://doi.org/10.5395/JKACD.2009.34.4.333
Ji-Hoon Kim, Dong-Hoon Shin
Department of Conservative Dentistry, College of Dentistry, Dankook University, Korea.
Corresponding author: Dong-Hoon Shin. Department of Conservative Dentistry, College of Dentistry, Dankook University, San 7-1, Shinbu-dong, Cheonan, 330-716, Korea. Tel: 82-41-550-1965, Fax: 82-41-550-1963, donyshin@dankook.ac.kr
Received 2009 April 27; Revised 2009 May 26; Accepted 2009 June 02.

Abstract

This study was done to determine if there is any difference in microleakage between experimental composite resins, in which various proportions of three component photoinitiators (Camphoroquinone, OPPI, Amine) were included.

Four kinds of experimental composite resin were made by mixing 3.2% silanated barium glass (78 wt.%, average size; 1 µm) with each monomer system including variously proportioned photoinitiator systems used for photoinitiating BisGMA/BisEMA/TEGDMA monomer blend (37.5:37.5:25 wt.%). The weight percentage of each component were as follows (in sequence Camphoroquinone, OPPI, Amine): Group A - 0.5%, 0%, 1% / Group B - 2%, 0.2%, 2% / Group C - 0.2%, 1%, 0.2% / Group D - 1%, 1%, 2%.

Each composite resin was used as a filling material for round class V cavities (diameter: 2/3 of mesiodistal width; depth: 1.5 mm) made on extracted human premolars and they were polymerized using curing light unit (XL 2500, 3M ESPE) for 40 s with an intensity of 600 mW/cm2. Teeth were thermocycled five-hundred times between 50℃ and 550℃ for 30s at each temperature.

Electrical conductivity (µA) was recorded two times (just after thermocycling and after three-month storage in saline solution) by electrochemical method.

Microleakage scores of each group according to evaluation time were as follows [Group: at first record / at second record; unit (µA)]: A: 3.80 (0.69) / 13.22 (4.48), B: 3.42 (1.33) / 18.84 (5.53), C: 4.18 (2.55) / 28.08 (7.75), D: 4.12 (1.86) / 7.41 (3.41).

Just after thermocycling, there was no difference in microleakage between groups, however, group C showed the largest score after three-month storage. Although there seems to be no difference in microleakage between groups just after thermocycling, composite resin with highly concentrated initiation system or classical design (Camphoroquinone and Amine system) would be more desirable for minimizing microleakage after three-month storage.

Keywords: Microleakage; Composite resin; Photoinitiation; Electrical conductivity; Thermocycling

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Article information Continued

Copyright © 2009 The Korean Academy of Conservative Dentistry

Table 1

Experimental composites with variously proportioned three-photoinitiator systems

Table 1

CQ: Camphoroquinone

OPPI: p-octyloxy-phenyl-phenyl iodonium hexafluoroantimonate

Bis-GMA: 2,2-bis[4-(2'-hydroxy-3'-methacryloxypropoxy)phenyl]propane

Bisphenol A-glycidylmethacrylates

Bis-EMA: Bisphenol A ethoxylate dimethacrylates

TEGDMA: Tri-ethylene glycol dimethacrylates

Table 2

Electric currents among groups

Table 2

Table 3

Tests of Between-subjects effects

Table 3

Table 4

Homogeneous subsets of three-month results (µA)

Table 4