NCT01066533

Immunohistochemical Study of Human Teeth Pulp Capped With Mineral Trioxide Aggregate (MTA) and Novel Endodontic Cement (NEC)

Histologic and Immunohistochemical Study of Fibronectin and Tenascin in Human Teeth Pulp Capped With MTA and NEC

• Status: Terminated
• Phase: Phase 4
• Study type: Interventional
• Enrollment: 32 (actual)
• Sponsor: Mashhad University of Medical Sciences · Academic / Other
• Sex: All
• Age: 16 Years – 30 Years
• Healthy volunteers: Accepted

Summary

The purpose of this study is to evaluate the response of human dental pulp to capping with MTA and NEC by histology and immunohistochemistry, using fibronectin and tenascin as markers, following 2 weeks and 8 weeks.

Detailed description

Capping of the exposed pulp is indicated for reversible pulp tissue injury after physical or mechanical trauma in developing or mature teeth.The response to direct pulp capping with materials such as MTA or NEC is the formation of dentin barrier, resulting from the recruitment and proliferation of undifferentiated cells. Different materials can be used to induce dentinal bridge formation.MTA has been introduced as a proper material to induce dentinal bridge formation,with greater mean thickness of dentinal bridge and less inflammation compared to traditional materials like calcium hydroxide. Although biocompatible, MTA has a poor handling characteristic, delay setting time, off-white color, and it is almost expensive.The Novel Endodontic Cement (NEC) has been introduced to combine reasonable characteristics of MTA with appropriate chemical properties, setting time, color, and handling characteristics. The extracellular matrix (ECM) of pulp comprises a variety of proteins and polysaccharides, forming a neat network. The ECM components can induce either reactionary or reparative dentin formation. Fibronectin (FN) and tenascin (TNC) are the two major glycoproteins involved in wound healing and odontogenesis. Fibronectins (FNs) are a class of high molecular weight adhesive proteins composed of two very large subunits. It has a variety of cell functions, such as adhesion, migration, growth, and differentiation. Furthermore FN may be involved in the polarization and migration of odontoblasts. Tenascin is a large oligomeric glycoprotein of the ECM secreted by fibroblasts and glial cells in tissue cultures. It has also been identified in pulp and more prominent in dentinogenesis. TN has been shown to be important in the differentiation of odontoblasts. Therefore, it may be associated with secondary dentin formation, when pulp cells differentiate into odontoblasts in response to physiologic stimuli. Although dentin bridge formation has been reported,using different materials such as MTA and NEC in direct pulp cap, but the exact mechanism is not well understood. Immunohistochemistry, using different markers, may be useful in developing the molecules involved in this process. Moreover,response of dental pulp to different pulp capping materials can be studied,including mean thickness of dentinal bridge, morphology of dentinal bridge, and intensity of pulp inflammation and presence of odontoblast cells.

Conditions

• Direct Pulp Capping

Interventions

Type	Name	Description
OTHER	direct pulp capping and covering the exposed pulp	In this arm 16 premolar teeth scheduled for extraction for orthodontic reasons were used.After signed consent was given by patients,local anesthesia was applied before operative procedures. Operative procedures were performed with rubber dam placement and disinfected with 2% chlorhexidine gluconate. Class I occlusal cavities were prepared with ¼ round carbide burs under air-distilled water cooling. At the exposure site hemorrhage was controlled by sterile cotton pellets, saline and 5.25% NaOCl.In this group MTA was mixed on a slab according to manufacture's instructions.Then MTA was carried with a carrier to exposed pulp and it was packed with a slight pressure by moist cotton pellet to completely cover the exposed pulp.The cavities were sealed immediately with Fuji II glass ionomer.The teeth were then followed and extracted(8 teeth after 2 weeks and 8 teeth after 8 weeks)
OTHER	direct pulp capping and covering the exposed pulp	In this arm 16 premolar teeth scheduled for extraction for orthodontic reasons were used.All the procedure was carried the same as the other group.But NEC cement was used as pulp capping material.It was mixed with its liquid to provide a dense creamy mixture and then was applied on exposed pulp.the cavities were immediately sealed with Fuji II glass ionomer.The patients were followed and 8 teeth were extracted after 2 weeks and 8 teeth were extracted after 8 weeks.

Timeline

• Start date: 2009-10-01
• Primary completion: 2009-12-01
• Completion: 2010-02-01
• First posted: 2010-02-10
• Last updated: 2010-02-10

Locations

1 site across 1 country: Iran