Journal List > J Korean Acad Conserv Dent > v.34(3) > 1056360

Han and Cho: Effect of a desensitizer on dentinal bond strength in cementation of composite resin inlay

Abstract

The purpose of this study was to evaluate the effect of a desensitizer on dentinal bond strength in cementation of composite resin inlay. Fifty four molar teeth were exposed the occlusal dentin. Class I inlay cavities were prepared and randomly divided into six groups. Control group ; no agent, Group 1 ; Isodan, Group 2 ; One-step, Group 3 ; All-Bond SE, Group 4 ; Isodan + One-step, Group 5 ; Isodan + All-Bond SE.
Desensitizing agent and dentin bonding agents were applied immediately after the completion of the preparations. Impressions were then made. The composite resin inlays (Tescera, Bisco) were fabricated according to the manufacturers' guidelines. Cementation procedures followed a standard protocol by using resin cement (Bis-Cem, Bisco). Specimens were stored in distilled water at 37℃ for 24 hours.
All specimens were sectioned to obtained sticks with 1.0 × 1.0 mm2 cross sectional area. The microtensile bond strength (µTBS) was tested at crosshead speed of 1 mm/min. The data was analyzed using oneway ANOVA and Tukey's test. Scanning electron microscopy analysis was made to examine the details of the bonding interface.
1. Group 1 showed significantly lower µTBS than other groups (p<0.05).
2. There was no significant difference between the µTBS of Group 3 and Group 5.
3. The µTBS of Group 4 showed significantly lower than that of Group 2 (p<0.05).
In conclusion, a desensitizer (Isodan) might have an adverse effect on the bond strength of composite resin inlay to dentin.

Figures and Tables

Figure 1
SEM photograph showing the gap at the dentin-resin cement interface produced by Control group (no agent).
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Figure 2
2. SEM photograph showing the gap at the dentin-resin cement interface produced by Group 1 (Isodan).
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Figure 3
SEM photograph showing the close adaptation at the dentin-resin cement interface produced by Group 2 (One-step).
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Figure 4
SEM photograph showing the close adaptation at the dentin-resin cement interface produced by Group 3 (All-Bond SE).
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Figure 5
SEM photograph showing the gap at the dentin-resin cement interface produced by Group 4 (Isodan + One-step).
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Figure 6
SEM photograph showingthe close adaptation of the dentin-resincement interface by Group 5 (Isodan + All-Bond SE).
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Table 1
Material, composition and manufacturer
jkacd-34-223-i001

All information provided by manufacturers.

BPDM: bisdimethacrylate, HEMA: Hydroxyethylmethacrylate, UDMA: urethane dimethacrylate,

Bis-GMA: Bisphenol-glycidyl methacrylate.

Table 2
Group classification
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Table 3
Microtensile bond strength (MPa) for each group
jkacd-34-223-i003

Superscripts of the same letter mean statistically no significant difference (p < 0.05, one-way ANOVA and Tukey's test)

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