Microleakage of class V glass ionomer restorations after conventional and Er:YAG laser preparation.
OBJECTIVE
The aim of this study was to investigate the microleakage in class V cavities following Er:YAG laser or conventional preparation restored with two conventional glass ionomer cements (cGIC) and to evaluate the effect of conditioning on laser-prepared surfaces.


BACKGROUND
Information on this topic related to cGIC is scarce.


METHODS
Sixty class V cavities were assigned to six groups: I and IV were Er:YAG-lased, II and V Er:YAG-lased and conditioned, and III and VI conventionally prepared and conditioned. Groups I, II, and III, were restored with Ketac Fil Plus Applicap; groups IV, V, and VI were restored with Fuji IX GP Capsule. Then, teeth were stored in distilled water (37 degrees C, 24 h), thermal cycled 1500 times (5-55 degrees C), placed in a 2% aqueous solution of methylene blue (37 degrees C, 24 h), embedded in acrylic resin, sectioned oro-facially, and analyzed for leakage.


RESULTS
Statistically significant differences between occlusal and cervical regions were observed (p < 0.05). Group III showed significantly more microleakage at the occlusal margin compared to group II (p = 0.022). Group V showed significantly more microleakage at the gingival margin than group VI (p = 0.022). Leakage on the occlusal margins was significantly higher in group III than in group VI (p = 0.038). Scanning electron microscopy indicated that conditioning of laser-prepared dentin with Ketac conditioner partially closed the tubules' orifices, whereas the use of GC conditioner completely obliterated the tubules.


CONCLUSIONS
The application of Ketac Fil Plus to laser-prepared enamel and dentin resulted in a better and more reproducible seal compared to conventionally prepared tooth surfaces. When using the more viscous Fuji IX application, Er:YAG lasing did not improve marginal adaptation.
Delme
Katleen Ilse Maria
KI
Department of Operative Dentistry and Endodontology, Dental School, Ghent University, Ghent University Clinic, Gent, Belgium.
Deman
Peter Jean
PJ
Nammour
Samir
S
De Moor
Roeland Jozef Gentil
RJ
D003737:Dental Cavity Preparation / Q000379:methods*; D003763:Dental Leakage; D005899:Glass Ionomer Cements; D006801:Humans; D007834:Lasers; D012387:Root Canal Filling Materials
D005899:Glass Ionomer Cements; D012387:Root Canal Filling Materials