Comparison of microleakage of three acid-base luting cements versus one resin-bonded cement for Class V direct composite inlays.
BACKGROUND
Demineralized dentin beneath set cement may adversely affect microleakage under fixed restorations.


OBJECTIVE
Microleakage of direct composite inlays cemented with acid-base cements and a methyl methacrylate resin cement were evaluated to determine their effect on the integrity of the underlying hybridized dentin.


METHODS
Sixty Class V box preparations (3 mm x 3 mm x 1.5 mm) were precisely prepared in previously frozen bovine teeth with one margin in enamel and another margin in dentin. Direct composite inlays (EPIC-TMPT) for each preparation were divided into 4 groups of 15 specimens each and cemented with 3 acid-base cements (control group): Elite, Ketac-Cem, Hy-Bond Carbo-Cem, and 1 adhesive resin cement: C&B Metabond. All specimens were stored in distilled water for 24 hours at 37 degrees C before immersion in 0.5% basic fuchsin for 24 hours. The dye penetration was measured on the sectioned specimens at the tooth-cement interface of enamel and cementum margins and recorded with graded criteria under light microscopy (Olympus Vanox-T) at original magnification x 50, 100, and 200. A Kruskal-Wallis and the Mann-Whitney test at P<.05 were used to analyze leakage score.


RESULTS
All cementum margins of the 3 acid-base cements tested demonstrated significantly higher leakage scores than cementum margins for inlays cemented with the resin cement tested(P<.01). No leakage along the tooth-cement interface was found for inlays retained with the adhesive resin cement.


CONCLUSIONS
Within the limitations of this study, the 3 acid-base cements tested exhibited greater microleakage at the cementum margins than did the adhesive resin cement that was tested.
Piemjai
Morakot
M
Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand. tmorakot@chula.ac.th
Miyasaka
Kumiko
K
Iwasaki
Yasuhiko
Y
Nakabayashi
Nobuo
N
D000818:Animals; D001896:Boron Compounds / Q000737:chemistry; D002417:Cattle; D003188:Composite Resins / Q000737:chemistry*; D003737:Dental Cavity Preparation / Q000145:classification; D003738:Dental Cements / Q000737:chemistry*; D003739:Dental Cementum / Q000473:pathology; D003743:Dental Enamel / Q000473:pathology; D003763:Dental Leakage / Q000145:classification*; D003804:Dentin / Q000473:pathology; D005899:Glass Ionomer Cements / Q000737:chemistry; D007284:Inlays / Q000145:classification*; D008277:Magnesium Oxide / Q000737:chemistry; D008689:Methacrylates / Q000737:chemistry; D020366:Methylmethacrylate / Q000737:chemistry; D008768:Methylmethacrylates / Q000737:chemistry; D011076:Polycarboxylate Cement / Q000737:chemistry; D011897:Random Allocation; D019279:Resin Cements / Q000737:chemistry*; D012394:Rosaniline Dyes; D018709:Statistics, Nonparametric; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry; D015034:Zinc Oxide / Q000737:chemistry; D015036:Zinc Phosphate Cement / Q000737:chemistry
D001896:Boron Compounds; D003188:Composite Resins; D003738:Dental Cements; C097956:Epic TMPT; D005899:Glass Ionomer Cements; D008689:Methacrylates; D008768:Methylmethacrylates; D011076:Polycarboxylate Cement; D019279:Resin Cements; D012394:Rosaniline Dyes; D014867:Water; D020366:Methylmethacrylate; D008277:Magnesium Oxide; C025485:basic fuchsin; D015036:Zinc Phosphate Cement; C040235:Ketac-cem; C049495:Super-bond; D015034:Zinc Oxide