- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT03631511
Histological Evaluation of Hard Tissue Formation After Direct Pulp Capping With RetroMTA (RetroMTA)
Histological Evaluation of Direct Pulp Capping on Human Pulp Tissue Using a RetroMTA
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
The study was conducted in accordance with the tenets of the World Medical Association Declaration of Helsinki. Seven caries-free, intact, maxillary, and mandibular third molars from humans, aged 30-37 years, which were scheduled for extraction for orthodontic or surgical purposes, were included in the study. The patients received a thorough explanation of the experimental rationale, clinical procedures, and possible complications. All experimental protocols were independently reviewed and approved by the Local Ethics Committee of Pomeranian Medical University, Szczecin, Poland (approval number KB-0012/27/13).
Clinical protocol. For all included teeth, periapical radiographs were taken to exclude the presence of caries or periapical pathology. Tooth sensitivity was assessed by thermal testing (Kältespray; M&W Dental, Büdingen, Germany) and electric sensitivity testing (Vitality Scanner Pulp Vitality Tester; SybronEndo, Orange, CA, USA). These teeth were subjected to pulp exposure, direct capping with RetroMTA, and restoration with a composite resin. Seven months later, the teeth were clinically and radiographically evaluated. Clinical assessment was performed at 1 week and at 7 months after the procedure. During clinical interviews, the patients were asked about the presence of pain, and its type and duration. Reactions to thermal stimuli were classified into three categories: 1 = normal response (pain lasting up to 10 s); 2 = an extended response (pain > 10 s); 3 = no response. An electrical test was performed using a Vitality Scanner, and was repeated three times. Seven months after the procedure the teeth were extracted and subjected to histological processing and evaluation.
Histological processing. Immediately after extraction, the teeth were immersed in a 10% neutral buffered formalin solution, and gently washed from blood and saliva. After brief prefixation (≤10 minutes), special precautions were taken to facilitate pulp tissue fixation. The roots were separated 5 mm apically to the cemento-enamel junction, using a diamond disk under copious water cooling. Then the teeth were grinded with a high speed cylindrical diamond bur under water spray in a mesio-distal or bucco-lingual plane until exposing one or more pulp horns. Photographs and radiographs were taken of each sample before successive steps. For demineralization, the specimens were immersed for 3 to 4 weeks in an aqueous solution consisting of a mixture of 22.5% (v/v) formic acid and 10% (w/v) sodium citrate, with radiographic determination of the end-point. Then all specimens were washed in running tap water for 24 hours, dehydrated using ascending grades of ethanol, cleared in xylene, infiltrated, and embedded in paraffin (melting point of 56 °C) following standard procedures. The paraffin blocks were trimmed. With the microtome set at 5 μM, serial sections were taken until exhausting the entire pulp tissue in the chamber. Six to eight sections were collected on each slide. Every fifth slide was stained with haematoxylin and eosin for screening and evaluation of mineralized tissue formation. These stained sections were used to locate the areas exhibiting the most severe inflammatory reactions, and those with less favourable bridging. Based on this initial evaluation, all slides adjacent to the location with the less favourable conditions were stained. In addition, the selected slides were subjected to a modified Brown and Brenn technique (Taylor 1966) for staining bacteria. Next, cover slips were placed on the slides, and the sections were examined using a light microscope. For each pulp, the worst histologic condition observed was recorded. If bacteria were observed on the cavity walls or in the area of exposure, the case was excluded from evaluation.
Two intact teeth (one maxillary and one mandibular third molar) extracted for pericoronitis were used as control. To test the reliability of the bacterial stain, two teeth with deep caries were examined, extracted because deemed non-restorable. These teeth were processed using the same protocol as the experimental group.
Slides were observed under a light microscope (Leica DMLB; Leica Microsystems, Wetzlar, Germany) and digital photographs were taken (Leica DFC420; Leica Microsystems, Wetzlar, Germany). Following aspects were observed with particular care: 1) Presence and type of mineralized tissues formed in the area of the surgical exposure; 2) Morphology of cells layering this mineralized tissue; 3) Presence and degree of inflammatory reactions in the pulpal area subjacent to the newly formed tissue; and 4) Presence of stainable bacteria in the experimental cavity or the area of pulp exposure.
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
-
-
Rybacka 1
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Szczecin, Rybacka 1, Poland, 70-111
- Pomeranian Medical University in Szczecin
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- The inclusion criteria were healthy patients with no contributing systemic conditions, who had at least one caries-free mature permanent third molar
Exclusion Criteria:
- The exclusion criteria included patients who had pulp inflammation, pulp necrosis, root resorption or periapical diseases
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: N/A
- Interventional Model: Single Group Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: RetroMTA
Direct pulp capping with RetroMTA (BioMTA, Daejeon, Korea)
|
The study included seven caries-free third molars from three adults.
These teeth were subjected to pulp exposure, direct capping with RetroMTA, and restoration with a composite resin.
Seven months later, the teeth were clinically and radiographically evaluated.
The teeth were then extracted and subjected to histological processing and evaluation.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Histological Evaluation of Direct Pulp Capping on Human Pulp Tissue Using a RetroMTA
Time Frame: 7 months
|
Each histomorphologic section was scored from 1-3, with 1 representing the most desired result and 3 representing the least desired result. Mineralized tissue bridge
Mineralized tissue morphology
Inflammatory response
Odontoblastic cell layer
Presence of bacteria
|
7 months
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Clinical Examination of Direct Pulp Capping on Human Pulp Tissue Using a RetroMTA
Time Frame: 7 months
|
Number of participants with adverse events related to RetroMTA treatment Periapical pathology
The presence of pain
Tooth sensitivity: I. Reactions to thermal stimuli
II. Electric sensitivity
1 representing the most desired result and 2 representing the least desired result. |
7 months
|
Collaborators and Investigators
Investigators
- Study Director: Alicja Nowicka, DDS, PhD, Department of Conservative Dentistry and Endodontics, Pomeranian Medical University, Al. Powstańców Wielkopolskich 72, 70-111, Szczecin, Poland
- Study Chair: Till Dammaschke, DDS, PhD, Department of Periodontology and Operative Dentistry, Westphalian Wilhelms-University, Albert-Schweitzer-Campus 1, building W 30, 48149 Münster, Germany
- Study Chair: Mariusz Lipski, DDS, PhD, Department of Preclinical Conservative Dentistry and Preclinical Endodontics, Pomeranian Medical University, Al. Powstańców Wielkopolskich 72, 70-111, Szczecin, Poland
- Study Chair: Domenico Ricucci, MD, DDS, Private Practice, Piazza Calvario, 7, 87022 Cetraro (CS), Italy
Publications and helpful links
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- Direct capping RetroMTA
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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