J Adv Prosthodont.  2015 Jun;7(3):224-232. 10.4047/jap.2015.7.3.224.

The effect of IDS (immediate dentin sealing) on dentin bond strength under various thermocycling periods

• Leesungbok R
• Lee SM
• Park SJ
• Lee SW
• Lee DY
• Im BJ
• Ahn SJ

• KMID: 2284708
• DOI: http://doi.org/10.4047/jap.2015.7.3.224

Abstract

PURPOSE
The purpose of this study was to find out the effect of immediate dentin sealing (IDS) on bond strength of ceramic restoration under various thermocycling periods with DBA (dentin bonding agent system).
MATERIALS AND METHODS
Fifty freshly extracted human mandibular third molars were divided into 5 groups (1 control and 4 experimental groups) of 10 teeth. We removed enamel layer of sound teeth and embedded them which will proceed to be IDS, using All Bond II. A thermocycling was applied to experimental groups for 1, 2, 7, 14 days respectively and was not applied to control group. IPS Empress II for ceramic was acid-etched with ceramic etchant (9.5% HF) and silane was applied. Each ceramic disc was bonded to specimens with Duo-link, dual curable resin cement by means of light curing for 100 seconds. After the cementation procedures, shear bond strength measurement and SEM analysis of the fractured surface were done. The data were analyzed with a one-way ANOVA and Tukey multiple comparison test (alpha=.05).
RESULTS
There were no statistically significant differences between 4 experimental groups and control group, however the mean value started to decrease in group 7d, and group 14d showed the lowest mean bond strength in all groups. Also, group 7d and 14d showed distinct exposed dentin and collapsed hybrid layer was observed in SEM analysis.
CONCLUSION
In the present study, it can be concluded that ceramic restorations like a laminate veneer restoration should be bonded using resin cement within one week after IDS procedure.

Keyword

Immediate dentin sealing; SEM analysis; Dentin bonding; Thermocycling; Ceramic restoration

MeSH Terms

Cementation
Ceramics
Dental Enamel
Dentin*
Humans
Molar, Third
Resin Cements
Tooth
Ceramics
Resin Cements

Figure

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  Fig. 1 A diagram of specimen (A: porcelain disc, B: polyester resin, C: lower molar with exposed dentin, a: diameter; 4 mm, b: height; 2 mm, c: diameter; 25 mm, d: height; 15 mm).

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  Fig. 2 Mean value and Standard deviation of shear bond strength (unit; N). The 1 way ANOVA showed no statistical difference was found among groups, but 14d group showed significantly lower mean bond strength than the control (d; day, DF; DebondingForce).

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  Fig. 3 SEM micrograph of fractured surface after SBST (original magnification ×100). (a; detached surface of resin cement, b; resin cement) (A) Group 0d, typical SEM micrograph of fractured surface after SBST from control group. (B) Group 1d, mostly unharmed interface of overlaying resin cement is on dentin surface. (C) Group 2d, most of exposed dentin is covered with resin cement (b), while detached surface of resin cement (a) is found in a small portion. (D) Group 7d, dentin surface has increased due to larger detached surface of resin cement (a). (E) Group 14d, Most of resin cement has detached from dentin surface.

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  Fig. 4 SEM micrograph of fractured surface after SBST (original magnification ×400). Closer examination shows similar pattern to SEM views for original magnification ×100. (a; detached surface of resin cement, adhesive, b; resin cement, c; exposed dentin) (A) Group 0d, typical SEM micrograph of fractured surface after SBST from control group. (B) Group 1d, small portion of detached resin cement and unharmed interface of overlaying resin cement is on dentin surface. (C) Group 2d, most of exposed dentin is covered with resin cement (b), while detached surface of resin cement (a) is found in a small portion. (D) Group 7d, larger detached surface of resin cement (a) reveals adhesive. (E) Group 14d, most of resin cement has detached from dentin surface coated by adhesive (a). Exposed dentin (c), which suggests failure in dentin, is clearly detectable in groups 7d and 14d.

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  Fig. 5 SEM micrograph of cross section of bonded porcelain disc to the specimen (original magnification, ×100). (a; porcelain disc, b; adhesive-resin cement layer, c; dentin covered with adhesive) (A) Group 0d, (B) Group 1d, (C) Group 2d. A uniform and thin adhesive-resin cement layer (b) is observed (A-C). (D) Group 7d, as compared with other groups, thickening and peeling of adhesive-resin cement layer (b) is found. (E) Group 14d, linear discontinuity between adhesive-resin cement layer and dentin was observed.

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  Fig. 6 SEM micrograph of cross section of bonded porcelain disc to the specimen (original magnification ×1000). Closer examination shows similar pattern to SEM views for original magnification ×100. (a; porcelain disc, b; adhesiveresin cement layer, c; exposed dentin, d; gap) (A) Group 0d, (B) Group 1d, (C) Group 2d, there are no differences between adhesive-resin cement layers (b) of these groups in terms of form and thickness (A-C) (D) Group 7d, perceptible changes appeared in IDS surface, (E) Group 14d, gap (d) is clearly detectable between adhesive-resin cement layer (b) and dentin (c).

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