Affiliation:
1. Department of Conservative Dentistry and Endodontics, Government Dental College and Hospital, Vijayawada, Andhra Pradesh, India
Abstract
Aim:
This study aims to evaluate the microleakage between the gingival seat and base material and to assess the interface integrity between the base material and overlying composite in class II cavities restored using deep margin elevation.
Materials and Methods:
Thirty maxillary molars (n = 30) were taken, and class II cavities were prepared with a gingival seat extending below the cementoenamel junction. These teeth were divided into three groups for subgingival margin elevation using different materials: Group A (n = 10) – flowable composite, Group B (n = 10) – glass ionomer cement (GIC), and Group C (n = 10) – GIC with nanohydroxyapatite (GIC n-HAp). The remaining cavities were restored with bulk-fill composite. After undergoing 1000 thermocycling cycles, half of the samples were examined for microleakage using confocal laser microscopy, and the other half were assessed for interface integrity using scanning electron microscopy. Microleakage was statistically analyzed by one-way ANOVA, and interface integrity was analyzed by Kruskal–Wallis tests.
Results:
The study found that GIC n-HAp exhibited significantly lower microleakage between the base material and gingival seat than flowable composite and GIC. However, regarding interface integrity between the base material and bulk-fill composite, flowable composite, and GIC outperformed GIC n-HAp.
Conclusions:
Incorporating n-HAp into GIC effectively reduced microleakage at the dentin-base material interface. However, the interface integrity between GIC n-HAp and the composite poses a challenge.
Reference15 articles.
1. Adhesive restorations in the posterior area with subgingival cervical margins: New classification and differentiated treatment approach;Veneziani;Eur J Esthet Dent,2010
2. Deep margin elevation: A paradigm shift;Magne;Am J Esthet Dent,2012
3. Deep margin elevation: A literature review;Samartzi;Dent J (Basel),2022
4. The efficacy of lining materials in the reduction of microleakage in class II composite resin restoration using the sandwich technique: A stereomicroscopic study;Benny;J Conserv Dent Endod,2023
5. Toughness, bonding and fluoride-release properties of hydroxyapatite-added glass ionomer cement;Lucas;Biomaterials,2003