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KMID : 1035020140150010044
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Endodontics and Dental Rehabilitation
2014 Volume.15 No. 1 p.44 ~ p.44
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A comparative evaluation of coronal microleakage of different restorative materials for sealing access cavities through zirconia crowns
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Shin Hyeong-Soon
Yang Won-Kyung
Ko Hyun-Jung
Kim Mi-Ri
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Abstract
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I. Objective
To compare sealing ability of different materials used to restore the prepared access cavities after completion of root canal treatment through zirconia crowns.
II. Materials & Methods
Thirty-six intact human mandibular premolars with fully developed single roots were used. All teeth crowns were flattened and cylindrical zirconia specimens (18mm diameter, 1mm thickness) were bonded on the teeth using resin cement (Panavia F2.0). Endodontic access openings by high-speed diamond burs through the zirconia specimens were followed by conventional root canal treatment. Root filled access cavities were left open (n = 4, control group) or restored with four different materials (n = 8, for each experimental groups), specifically amalgam, resin-modified glass ionomer (Fuji II LC), composite resin (LuxaCore) with two-step self-etch adhesive (CLEARFIL SE BOND) and composite resin with one-step self-etch adhesive (ALLBOND UNIVERSAL). After storing in water for 3 days, all teeth were immersed for 24 hours in blue ink solution and then sectioned buccolingually. The extensions of blue ink along the walls of access cavities were measured under a stereomicroscope. All data were analyzed using the Kruskal-Wallis and Mann-Whitney U tests (P<0.05).
III. Results
Dye penetrated whole access cavities for all specimens in the control group. Composite resin with two-step self-etch adhesive showed no dye leakage. While one-step self-etch adhesive (0.12°±0.13 mm) showed greater amount of dye leakage than two-step self-etch adhesive, there was no statistically significant difference between bonding systems (P=0.066). Amalgam (1.41°±0.52 mm) and resin-modified glass ionomer (1.25°±0.35 mm) showed greater amount of dye leakages than composite resins (P<0.05). No significant difference was found between amalgam and resin-modified glass ionomer (P=0.318).
IV. Conclusion
With the limitations of dye leakage test, the present findings suggest that composite resins with self-etch adhesives have superior sealing ability than amalgam or resin-modified glass ionomer to restore postendodontic access cavities of zirconia crowns. Further research is needed to validate these findings with more reliable methods different from dye penetration.
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