Table of Contents
ISRN Dentistry
Volume 2011, Article ID 180197, 5 pages
Research Article

Efficacy of Composite Restorative Techniques in Marginal Sealing of Extended Class V Cavities

1Dental Biomaterials, Restorative Dental Sciences Department, College of Dentistry, King Saud University, Riyadh 11545, Saudi Arabia
2Operative Dentistry, Restorative Dental Sciences Department, College of Dentistry, King Saud University, P.O. Box 60169, Riyadh 11545, Saudi Arabia

Received 19 August 2010; Accepted 21 September 2010

Academic Editor: M. Behr

Copyright © 2011 Salwa Khier and Khamis Hassan. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Objectives. To compare the efficacy of three placement techniques in marginal sealing of Class V composite restorations extending onto the root. Materials and Methods. Class V cavities were prepared on buccal surfaces of 30 extracted human molars, with gingival margins 1.5 mm on the root. Prepared teeth were randomly assigned into 3 groups of 10 each and restored with Single Bond/Filtek Supreme using following techniques; Group I: oblique; Group II: occlusogingival; and Group III: split-increment. After restoration finishing, teeth were thermocycled, and immersed in 2% methylene blue dye for 24 h. Teeth were sectioned buccolingually. Digital photographs were made of sectioned surfaces using digital camera fitted on stereomicroscope. Microleakage was scored at occlusal and gingival margins using 0–3 scale. Dye penetration depth (DPD) at both margins was also measured using AnalySIS software. Data were analyzed using one-way ANOVA and Bonferroni multiple comparison test. Results. 5% of occlusal margins in Groups I and III had 50  πœ‡ m average (DPD). In Group II, only 10% of occlusal margins showed dye penetration, with 60  πœ‡ m average depth. For gingival margins, Groups I and III presented dye penetration in 55% of specimens, with 220 and 150  πœ‡ m average (DPD), respectively. Group II had 60% of gingival margins, with 230  πœ‡ m average (DPD). There was no significant difference in microleakage at occlusal and gingival margins in all groups. Dye penetration was larger at gingival than at occlusal margins ( 𝑃 < . 0 0 1 ). Conclusion. None of placement techniques produced gap-free margins. Oblique and occlusogingival techniques exhibited higher degrees of microleakage at occlusal and gingival margins, as compared to that of split-increment technique. Splitting flat composite increment by diagonal cut, prior to light-curing, preserved bonded gingival margin integrity and reduced microleakage.