Real-time measurement of dentinal tubular fluid flow during and after amalgam and composite restorations

Sun-Young Kim; Byeong-Hoon Cho; Seung-Ho Baek; Bum-Sun Lim; In-Bog Lee

doi:10.5395/JKACD.2009.34.6.467

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Kim, Cho, Baek, Lim, and Lee: Real-time measurement of dentinal tubular fluid flow during and after amalgam and composite restorations

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2009; 34(6): 467-476.

Published online: 30 November 2009

DOI: https://doi.org/10.5395/JKACD.2009.34.6.467

Real-time measurement of dentinal tubular fluid flow during and after amalgam and composite restorations

Sun-Young Kim¹, Byeong-Hoon Cho¹, Seung-Ho Baek¹, Bum-Sun Lim², In-Bog Lee¹

¹Department of Conservative Dentistry, School of Dentistry, Seoul National University, Korea.

²Department of Dental Biomaterials, School of Dentistry, Seoul National University, Korea.

Corresponding Author: In-Bog Lee. Department of Conservative Dentistry, School of Dentistry, Seoul National University, 275-1 Yeongeon-Dong, Jongno-Gu, Seoul 110-768, Korea. Tel: 82-2-2072-3953, Fax: 82-2-2072-3859, inboglee@snu.ac.kr

Received 29 June 2009 Revised 31 August 2009 Accepted 1 September 2009

(open-access):

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The aim of this study was to measure the dentinal tubular fluid flow (DFF) during and after amalgam and composite restorations. A newly designed fluid flow measurement instrument was made. A third molar cut at 3 mm apical from the CEJ was connected to the flow measuring device under a hydrostatic pressure of 15 cmH₂O. Class I cavity was prepared and restored with either amalgam (Copalite varnish and Bestaloy) or composite (Z-250 with ScotchBond MultiPurpose: MP, Single Bond 2: SB, Clearfil SE Bond: CE and Easy Bond: EB as bonding systems). The DFF was measured from the intact tooth state through restoration procedures to 30 minutes after restoration, and re-measured at 3 and 7days after restoration.

Inward fluid flow (IF) during cavity preparation was followed by outward flow (OF) after preparation. In amalgam restoration, the OF changed to IF during amalgam filling and slight OF followed after finishing.

In composite restoration, application CE and EB showed a continuous OF and air-dry increased rapidly the OF until light-curing, whereas in MP and SB, rinse and dry caused IF and OF, respectively. Application of hydrophobic bonding resin in MP and CE caused a decrease in flow rate or even slight IF. Light-curing of adhesive and composite showed an abrupt IF. There was no statistically significant difference in the reduction of DFF among the materials at 30 min, 3 and 7 days after restoration (P > 0.05).

Keywords: Dentinal tubular fluid flow, Amalgam, Composite, Bonding system

Figures and Tables

Figure 1

Schematic diagram of the dentinal tubular fluid flow measurement system.

Figure 2

Consecutive DFF during amalgam restoration. Upward movement (+) vs time on graph indicates outward DFF, whereas downward movement (-) indicates inward DFF. CP: cavity preparation; V: varnish application; ga: gentle air stream; AF: amalgam filling.

Figure 3

(a) Consecutive DFF during composite restoration with MP. (b) Magnified view of consecutive DFF during bonding procedure of MP. Upward movement (+) vs time on graph indicates outward DFF, whereas downward movement (-) indicates inward DFF. CP: cavity preparation; LC: light curing; C1: first layer filling of composite; C2: second layer filling of composite; E: acid-etching; r: rinse; d: blot-dry; P: primer application; ga: gentle air; A: adhesive application.

Figure 4

(a) Consecutive DFF during composite restoration with SB. (b) Magnified view of consecutive DFF during bonding procedure of SB. Upward movement (+) vs time on graph indicates outward DFF, whereas downward movement (-) indicates inward DFF. CP: cavity preparation; LC: light curing; C1: first layer filling of composite; C2: second layer filling of composite; E: acid-etching; r: rinse; d: blot-dry; sb: Single Bond application; ga: gentle air.

Figure 5

(a) Consecutive DFF during composite restoration with CE. (b) Magnified view of consecutive DFF during bonding procedure of CE. Upward movement (+) vs time on graph indicates outward DFF, whereas downward movement (-) indicates inward DFF. CP: cavity preparation; LC: light curing; C1: first layer filling of composite; C2: second layer filling of composite; SE: self-etching primer application; a: air-dry; A: adhesive application.

Figure 6

(a) Consecutive DFF during composite restoration with EB. (b) Magnified view of consecutive DFF during bonding procedure of EB. Upward movement (+) vs time on graph indicates outward DFF, whereas downward movement (-) indicates inward DFF. CP: cavity preparation; LC: light curing; C1: first layer filling of composite; C2: second layer filling of composite; eb: Easy Bond application; a: air-dry.

Table 1

The restorative materials and procedures for each group.

Abbreviation: E, acid etching for 15 sec; P, Primer application; A, Adhesive application; PA, application of mixed agent with primer and adhesive; SE, self-etching primer application; SEA, application of self-etching adhesive; LC, light-curing; RF, resin composite filling.

Table 2

Flow rate reduction (%) of each group at 30 minutes, 3 days, and 7days after restoration with respect to baseline (n=10).

There was no statistically significant difference among groups for each measurement time. There was no statistically significant difference according to the measurement time for each material. s.d=standard deviation.

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