Sealing ability of composite resin placed over calcium hydroxide and calcium sulphate plugs in the repair of furcation perforations in mandibular molars: a study in vitro

Backgrounds. Marginal discoloration, microleakage, wear, and marginal fractures are all prevalent problems with composite veneers, and this scenario leads the esthetic outcome to deteriorate with time, resulting in patient discontent. Aim of the Study. The study’s goal was to determine the marginal sealing ability of composite laminate veneers when employing two types of veneer techniques: direct and direct-indirect veneers, as well as two types of composite resin: nanohybrid and microfilled composite resin restorations, using dye penetration method. Materials and Methods. In this study, forty extracted human teeth were utilized. Following a standardized veneer preparation on the labial surface of the teeth, they were separated into two groups of 20 teeth each, using the following composite application techniques: group A: direct veneers and group B: direct-indirect veneers. Following that, each major group was separated into two subgroups of ten teeth each, based on the type of composite employed: subgroup 1 used nanohybrid composite resin, while subgroup 2 used microfilled composite resin. All of the samples were kept in distilled water, thermocycled, and soaked in 2% basic fuchsine dye. These specimens were sectioned and examined under a stereomicroscope for dye penetration at the gingival margin. The data was analyzed using independent T -tests using SPSS 22. Result. Using direct-indirect veneer technique with nanohybrid composite resin material resulted in the most negligible dye penetration at the gingival margin, while using direct veneer technique with microfilled composite resin material resulted in the maximum dye penetration. For both composite materials, gingival microleakage was lower when using the direct-indirect veneer technique than when using the direct technique, and the difference was statistically significant ( P < 0.05 ). In both techniques, gingival microleakage was lower with nanohybrid composite than with microfilled composite, and the difference was statistically highly significant ( P = 0.001 ). Conclusion. The sealing ability of the gingival margin of tooth/composite interface is better when applying direct-indirect veneer technique with nanohybrid composite resin than that of direct veneer technique with microfilled composite resin material.

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Sealing Ability of ProRoot MTA and MTA-Angelus Simulating a One-Step Apical Barrier Technique- An in vitro Study

Journal of Clinical Pediatric Dentistry ◽

10.17796/jcpd.33.4.gp472416163h7818 ◽

2009 ◽

Vol 33 (4) ◽

pp. 305-310 ◽

Cited By ~ 9

Author(s):

Nikita Lolayekar ◽

Sham Bhat ◽

Sundeep Hegde

Keyword(s):

Calcium Hydroxide ◽

In Vitro Study ◽

Control Group ◽

Blue Dye ◽

Root Segments ◽

Sealing Ability ◽

Significant Difference ◽

Group A ◽

Group B

Endodontic treatment of the pulpless tooth with an immature root apex poses a special challenge for the clinician due to lack of an apical stop against which to compact an interim dressing of calcium hydroxide, or the final obturation material. A one-visit apexification protocol with MTA (Mineral Trioxide Aggregate) has be seen as an alternative to the traditional treatment practices with calcium hydroxide [Ca(OH)2]. The aim of this study was to investigate the use of MTA as a 5mm apical barrier by comparing sealing ability of ProRoot MTA to that of MTA-Angelus. 50 freshly extracted Maxillary and Mandibular single canal sound human incisor teeth were used in this study, which were decoronated to standardized 10mm root lengths. The root segments were prepared to simulate the clinical situation of an open apex with Gates Glidden burs # 5-1 and randomly assigned into 2 experimental groups of 20 samples each (Group A: ProRoot MTA, Group B: MTA-Angelus) and 10 root segments were used as control (Group C) where no apical barrier was used. After obturation the coronal portion of all samples were sealed with Glass Ionomer and stored at 37°C and 100% humidity for 4 weeks. The root segments were then double coated with nail varnish except for the apical 1mm and apical ends of all root segments were suspended vertically in methylene blue dye for 48 hours at room temperature. After removal from the dye, the samples were sectioned longitudinally and linear dye penetration was measured using a Grid and stereomicroscope. The measurements were tabulated and statistically analyzed. The mean percentage of dye leakage for Group A was 55.5% and for Group B was 53.25%. The results showed no statistically significant difference in the sealing ability of ProRoot MTA and MTA-Angelus when used as apical barriers.

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