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

Sponsor

Mashhad University of Medical Sciences (Other)

Overall Status

Terminated

CT.gov ID

NCT01066533

Collaborator

Shahid Beheshti University of Medical Sciences (Other)

Enrollment

Location

Arms

Duration (Months)

7.9

Patients Per Site Per Month

Study Details

Study Description

Brief 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.

Condition or Disease	Intervention/Treatment	Phase
Direct Pulp Capping	Other: direct pulp capping and covering the exposed pulp Other: direct pulp capping and covering the exposed pulp	Phase 4

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.

Study Design

Study Type:

Interventional

Actual Enrollment :

32 participants

Allocation:

Randomized

Intervention Model:

Parallel Assignment

Masking:

Double (Care Provider, Outcomes Assessor)

Primary Purpose:

Treatment

Official Title:

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

Study Start Date :

Oct 1, 2009

Actual Primary Completion Date :

Dec 1, 2009

Anticipated Study Completion Date :

Feb 1, 2010

Arms and Interventions

Arm	Intervention/Treatment
Experimental: Mineral Trioxide Aggregate(MTA) MTA is a proper material for direct pulp capping,treatment of tooth perforations,root end filling.It is a safe and biocompatible material,which can induce cementum formation on root surface.In direct pulp capping, MTA can induce dentinal bridge formation on the expose surface to preserve pulp vitality.Although MTA has superior biocompatibility compared with the conventional materials,it has a delayed setting time, poor handling characteristics and off-white color	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)
Experimental: NEC cement NEC cement is a proper material for direct pulp capping and treatment of tooth perforation. It is a new dental material that combines reasonable biocompatibility of MTA with appropriate setting time,handling characteristics,chemical properties and color.Like MTA, NEC cement can induce dentinal bridge formation in direct pulp capping to preserve pulp vitality.	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.

Arm

Intervention/Treatment

Experimental: Mineral Trioxide Aggregate(MTA)

MTA is a proper material for direct pulp capping,treatment of tooth perforations,root end filling.It is a safe and biocompatible material,which can induce cementum formation on root surface.In direct pulp capping, MTA can induce dentinal bridge formation on the expose surface to preserve pulp vitality.Although MTA has superior biocompatibility compared with the conventional materials,it has a delayed setting time, poor handling characteristics and off-white color

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)

Experimental: NEC cement

NEC cement is a proper material for direct pulp capping and treatment of tooth perforation. It is a new dental material that combines reasonable biocompatibility of MTA with appropriate setting time,handling characteristics,chemical properties and color.Like MTA, NEC cement can induce dentinal bridge formation in direct pulp capping to preserve pulp vitality.

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.

Outcome Measures

Primary Outcome Measures

histologic study of: 1-mean thickness of formed dentinal bridge 2-morphology of formed dentinal bridge 3-intensity of pulp inflammation 4-odontoblastic layer [2 weeks and 8 weeks]

Secondary Outcome Measures

expression of Fibronectin and Tenascin by immunohistochemistry on a scale of 1 to 3: (a) 1 equals no staining; (b) 2 equals light-medium staining; (c) 3 equals medium-heavy staining for the marker [2 weeks and 8 weeks]

Eligibility Criteria

Criteria

Ages Eligible for Study:

16 Years to 30 Years

Sexes Eligible for Study:

All

Accepts Healthy Volunteers:

Yes

Inclusion Criteria:

patients 16-30 year-old
patients with no systemic disease
vital mature teeth with closed apex, no caries either clinically or radiographically, and without any restoration
patients willing to participate in study

Exclusion Criteria:

patients not in the range of 16-30 year-old
patients with systemic disease
nonvital teeth
open apex teeth
teeth with caries or restorations
patients not willing to participate in study

Contacts and Locations

Locations

	Site	City	State	Country	Postal Code
1	Mashhad university of medical sciences	Mashhad	Khorasan	Iran, Islamic Republic of

Sponsors and Collaborators

Mashhad University of Medical Sciences
Shahid Beheshti University of Medical Sciences

Investigators

Study Director: Maryam Javidi, endodontist, Mashhad University of Medical Sciences
Study Director: Mohamad hasan zarrabi, endodontist, Mashhad University of Medical Sciences