Warning: mkdir(): Permission denied in /home/virtual/lib/view_data.php on line 81

Warning: fopen(upload/ip_log/ip_log_2024-12.txt): failed to open stream: No such file or directory in /home/virtual/lib/view_data.php on line 83

Warning: fwrite() expects parameter 1 to be resource, boolean given in /home/virtual/lib/view_data.php on line 84
Influence of cavity size and restoration methods on the cusp deflection in composite restoration


Your browser does not support the NLM PubReader view.

Go to this page to see a list of supporting browsers.

Influence of cavity size and restoration methods on the cusp deflection in composite restoration

Article information

Restor Dent Endod. 2004;29(6):532-540
Publication date (electronic) : 2004 November 30
doi : https://doi.org/10.5395/JKACD.2004.29.6.532
Mi-Ra Lee, In-Bog Lee, Chang-In Seok, Sang-Tag Lee, Chung-Moon Um
Department of Conservative Dentistry, College of Dentistry, Seoul National University, Korea.
Corresponding author: Chung-Moon Um. Department of Conservative Dentistry, College of Dentistry, Seoul National University, 28 Yoengun-dong, Chongro-gu, Seoul, Korea, 110-749. Tel: 82-2-2072-3953, 2651 Fax: 82-2-2072-3859, inboglee@snu.ac.kr

Abstract

The aim of this study was to measure the cusp deflection during composite restoration for MOD cavity in premolar and to examine the influence of cavity dimension, C-factor and restoration method on the cusp deflection.

Thirty extracted maxillary premolar were prepared to four different sizes of MOD cavity and divided into six groups. The width and depth of the cavity were as follows. Group 1; 1.5 × 1 mm, Group 2; 1.5 × 2 mm, Group 3; 3 × 1 mm, and Group 4-6; 3 × 2 mm respectively. Group 1-4 were restored using bulk filling method with Z-250 composite. However, Group 5 was restored incrementally, and Group 6 was restored with an indirect resin inlay.

The cusp deflection was recorded at the buccal and lingual cusp tips using LVDT probe for 10,000 seconds. The measured cusp deflections were compared between groups, and the relationship between the cube of the length of cavity wall/the cube of the thickness of cavity wall (L3 / T3), C-factor and cusp deflection or %flexure (100 × cuspal deflection / cavity width) was analyzed.

The cusp deflection of Group 1-4 were 12.1 µm, 17.2 µm, 16.2 µm and 26.4 µm respectively. The C-factor was related to the %flexure rather than the cusp deflection. There was a strong positive correlationship between the L3 / T3 and the cusp deflection. The cusp deflection of Group 5 and 6 were 17.4 µm and 17.9 µm respectively, which are much lower value than that of Group 4.

Keywords: Cusp deflection; Cavity dimension; C-factor; Bulk-cure; Incremental cure; Indirect resin inlay

References

1. de Gee AF, Feilzer AJ, Davidson CL. True linear polymerization shrinkage of unfilled resins and composites determined with a linometer. Dent Mater 1993. 911–14.
2. Song YX, Inoue K. Linear shrinkage of photo-activated composite resins during setting. J Oral Rehabil 2001. 28335–341.
3. Lee IB. A new method-real time measurement of the initial dynamic volumetric shrinkage of composite resins during polymerization. J Korean Acad Conserv Dent 2001. 26134–140.
4. Rosin M, Urban AD, Gartner C, Bernhardt O, Splieth C, Meyer G. Polymerization shrinkage-strain and microleakage in dentin-bordered cavities of chemically and light-cured restorative materials. Dent Mater 2002. 18521–528.
5. Goldman M. Polymerization shrinkage of resin-based restorative materials. Aust Dent J 1983. 28156–161.
6. Rees JS, Jacobsen PH. The polymerization shrinkage of composite resins. Dent Mater 1989. 541–44.
7. Lai JH, Johnson AE. Measuring polymerization shrinkage of photo-activated restorative materials by a water-filled dilatometer. Dent Mater 1993. 9139–143.
8. Opdam NJ, Roeters FJ, Feilzer AJ, Verdonschot EH. Marginal integrity and postoperative sensitivity in Class 2 resin composite restorations in vivo. J Dent 1998. 26555–562.
9. Carvalho RM, Pereira JC, Yoshiyama M, Pashley DH. A review of polymerization contraction: the influence of stress development versus stress relief. Oper Dent 1996. 2117–24.
10. Segura A, Donly KJ. In vitro posterior composite polymerization recovery following hygroscopic expansion. J Oral Rehabil 1993. 20495–499.
11. Alomari QD, Reinhardt JW, Boyer DB. Effect of liners on cusp deflection and gap formation in composite restorations. Oper Dent 2001. 26406–411.
12. Suliman AH, Boyer DB, Lakes RS. Polymerization shrinkage of composite resins: comparison with tooth deformation. J Prosthet Dent 1994. 717–12.
13. Meredith N, Setchell DJ. In vitro measurement of cuspal strain and displacement in composite restored teeth. J Dent 1997. 25331–337.
14. McCullock AJ, Smith BG. In vitro studies of cusp reinforcement with adhesive restorative material. Br Dent J 1986. 161450–452.
15. Suliman AA, Boyer DB, Lakes RS. Interferometric measurements of cusp deformation of teeth restored with composites. J Dent Res 1993. 721532–1536.
16. Pearson GJ, Hegarty SM. Cusp movement of molar teeth with composite filling materials in conventional and modified MOD cavities. Br Dent J 1989. 166162–165.
17. Jantarat J, Panitvisai P, Palamara JE, Messer HH. Comparison of methods for measuring cuspal deformation in teeth. J Dent 2001. 2975–82.
18. Hood JA. Biomechanics of the intact, prepared and restored tooth: some clinical implications. Int Dent J 1991. 4125–32.
19. Davidson CL, de Gee AJ. Relaxation of polymerization contraction stresses by flow in dental composites. J Dent Res 1984. 63146–148.
20. Unterbrink GL, Liebenberg WH. Flowable resin composites as "filled adhesives": literature review and clinical recommendations. Quintessence Int 1999. 30249–257.
21. Versluis A, Douglas WH, Cross M, Sakaguchi RL. Does an incremental filling technique reduce polymerization shrinkage stresses? J Dent Res 1996. 75871–878.
22. Abbas G, Fleming GJ, Harrington E, Shortall AC, Burke FJ. Cuspal movement and microleakage in premolar teeth restored with a packable composite cured in bulk or in increments. J Dent 2003. 31437–444.
23. Rees JS, et al. A reappraisal of the incremental packing technique for light cured composite resins. J Oral Rehabil 2004. 3181–84.
24. Rees JS, Jacobsen PH. Stresses generated by luting resins during cementation of composite and ceramic inlays. J Oral Rehabil 1992. 19115–122.
25. Ericson D, Paulsson L, Sowiak H, Derand T. Reduction of cusp deflection resulting from composite polymerization shrinkage, using a light-transmitting cone. Scand J Dent Res 1994. 102244–248.
26. Davidson CL, de Gee AJ. Light-curing units, polymerization, and clinical implications. J Adhes Dent 2000. 2167–173.
27. Feilzer AJ, De Gee AJ, Davidson CL. Increased wall-to-wall curing contraction in thin bonded resin layers. J Dent Res 1989. 6848–50.
28. Feilzer AJ, De Gee AJ, Davidson CL. Setting stress in composite resin in relation to configuration of the restoration. J Dent Res 1987. 661636–1639.
29. Davidson CL, Feilzer AJ. Polymerization shrinkage and polymerization shrinkage stress in polymer-based restoratives. J Dent 1997. 25435–440.
30. Lee IB, Son HH, Kwon HC, Um CM, Cho BH. The effect of viscosity, specimen geometry and adhesion on the linear polymerization shrinkage measurement of light cured composites. J Korean Acad Conserv Dent 2003. 28457–466.
31. Davidson CL, Van Zeghbroeck L, Feilzer AJ. Destructive stresses in adhesive luting cements. J Dent Res 1991. 70880–882.
32. Alster D, Feilzer AJ, de Gee AJ, Davidson CL. Polymerization contraction stress in thin resin composite layers as a function of layer thickness. Dent Mater 1997. 13146–150.
33. Craig RG, Powers JM. Restorative dental materials 2002. 11th edth ed. Mosby, Inc; 87–88.
34. Blank JT. Scientifically based rationale and protocol for use of modern indirect resin inlays and onlays. J Esthet Dent 2000. 12195–208.
35. Watts DC, Cash AJ. Determination of polymerization shrinkage kinetics in visible-light-cured materials: methods development. Dent Mater 1991. 7281–287.

Article information Continued

Copyright © 2004 Korean Academy of Conservative Dentistry
(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.

Figure 1

Figure 1

Configuration of the instrument for measuring cusp deflection.

Figure 2

Figure 2

Diagram of prepared cavity.

a. The dimension of occlusal cavity and proximal box (W: Width of cavity, D: Depth of cavity, L: Length of cavity wall)

b. Simplified cavity shape for calculation of the C-factor.

Figure 3

Figure 3

Representative curves of cusp deflection as a function of time.

a. Bulk cure (Group 1-4)

b. Bulk cure vs. Incremental cure and Indirect Resin Inlay (Group 4, 5 and 6)

Figure 4

Figure 4

Mean cusp deflections for each tested group.

Figure 5

Figure 5

a. A positive correlationship was present between the L3/T3 and the cusp deflection.

b. A positive correlationship was present between the C-factor and the %flexure.

Table 1

The prepared cavity sizes in this study

Table 1

Group 1-4; for bulk cure.

Group 5; for incremental cure.

Group 6; for indirect resin inlay.

Table 2

The prepared cavity wall dimension, the L3/T3, C-factor, cusp deflection and %flexure measured.

Table 2

Standard deviations are in parenthesis.

%flexure = 100×(cusp deflection/cavity width) %

Table 3

The results of correlation analysis between the L3/T3, C-factor, and cusp deflection or %flexure.

Table 3

** Correlation is significant at the 0.01 level