A New Clinical Use of Ferumoxytol Nanoparticles: An Antibiofilm Treatment

Phase 4

Completed

Conditions: Apical Periodontitis
Pulp Disease, Dental

Interventions: Drug: NaOCl
Drug: NaCl
Drug: Iron oxide nanoparticles treatment Ferumoxytol/H2O2
Drug: supplementary irrigation

Registration Number: NCT06110494

Lead Sponsor: University of Pennsylvania

Brief Summary: The goal of this observational is study is to develop a protocol for root canal biofilms disinfection using a clinically approved and commercially available iron oxide nanoparticle formulation Ferumoxytol/H2O2 treatments. This protocol will be testing local single topical application of Ferumoxytol within the root canal system in patients going through routine root canal treatment, evaluate its potential as anti-biofilm treatment and compare it to the clinical gold standard disinfecting solution sodium hypochlorite (positive control) and saline (negative control).

Detailed Description: Patients presenting to the Department of Endodontics, School of Dental Medicine, University of Pennsylvania for evaluation and routine endodontic treatment of infected, necrotic teeth with chronic apical periodontitis will be asked to take part in the study if they meet the inclusion criteria and volunteer to participate. After eligibility of the patient is confirmed, the patient will be assigned to treatments through the process of drawing lots from a box that was maintained in a locked cabinet. Before treatment, patients will be thoroughly informed about the nature, potential risks and alternatives of the study as well as the root canal treatment. Patients will be presented with a written consent form regarding the above mentioned study characteristics as well as the regular consent forms for the root canal therapy, including the consent form for endodontic treatement, acknowledgement of privacy practices and a patient understanding and informed consent form. Briefly, the patient will be anesthetized and the tooth isolated with rubber dam. 30% H2O2 followed by 3% NaOCl will be used to disinfect the tooth and the rubber dam. The removal of caries and the endodontic access will be carried out by sterile high-speed carbide burs.After access preparation with sterile burs and sterile saline irrigation, thermoplastic gutta percha was placed to temporarily block the orifice. The field, including the pulp chamber, is cleaned and disinfected as described previously. NaOCl is neutralized with 10% sodium thiosulfate. Contamination control sample (S0) will be taken from the internal cavosurface angle where the paper points will accidentally touch during sampling.After initial access to the root canal orifices, working length will be measured and a bacteriological sample will be taken from the targeted canals (S1). Sterile paper points will be placed into the canal, allowed to saturate and then transferred to a vial containing liquid dental transport media (LDT). For NaOCl group (Positive control), canals will be instrumented up to size 25/0.04 taper using 2mL of 3% NaOCl in between files. For Ferumoxytol/H2O2 group, canals will be instrumented up to size 25/0.04 taper using 2mL of a mixture of 6 mg/ml of Ferumoxytol with 3% H2O2. For saline only group, canals will be instrumented up to size 25/0.04 taper using 2mL of saline. When the final 25/0.04 taper apical size is reached, a second bacterial sample will be taken (S2). Before all samplings, sodium hypochlorite, Feramehe/ H2O2 and Saline. Canal contents will be deactivated with sodium thiosulphate for NaOCl,and saline wash will be used for Fer/H2O2 and saline treatments. A wash step with 1 mL saline was done to wash the deactivating solution, and paper points were used to dry the canals. A second bacterial sample was taken (S2) by placing LDT inside the canal, agitating it with 25/0.02 Hedstrom hand file, followed by absorbing the content with 2 paper points placed in the canal for 30 seconds each. The paper points will be placed inside a tube containing LDT. An additional step was included for all the test groups to evaluate if further irrigation after (S2) will lead to more reduction of bacterial counts inside the root canal system. This could inform future experiments evaluating the possibility of synergistic antimicrobial effects for the sequential Fer/H2O2 and NaOCl treatment. All canals in all groups were irrigated with 2 mL of 3% NaOCl (1 min), followed by ultrasonic irrigant activation for 30 seconds. This step was repeated once again making the total activation time 1 min and the total contact time of the irrigant 3 min. Upon completion of irrigation, a third bacterial sample (S3) was taken following the deactivation, washing, drying, and sampling steps as described previously. The remaining treatment sequences of the routine root canal therapy will be carried out after these procedures including further root-end enlargement and final routine irrigation protocol. The root canals will be dried with paper points, a medication (calcium hydroxide) will be placed and the teeth sealed with a temporary restoration. Patients will return after one to four weeks for completion of the root filling. For the any of the groups, the treatment procedures carried out during this investigation do not differ from the standard root canal treatment protocol with the exception of additional irrigation step with the experimental solution and the bacteriologic sampling procedures. The paper points used to take the bacteriological sampling will be transferred to the microbiology laboratory using a vial containing 1 ml of LDT. The laboratory procedures will be performed at the University of Pennsylvania Leon Levy Oral Health Sciences Building of the School of Dental Medicine in the Microbiology Laboratory Vial labels will contain information on tooth number, sample number (S0-S1-S2-S3) and the experimental group. The samples will be diluted and plated in culture plates. The culture plates will be incubated at 37°C in an anaerobic glove box containing 5% hydrogen, 5% CO2 and balance N2 for 5 days. After incubation the number of colony forming units will be determined by using a stereoscope. ANOVA and Students t-test will be used for statistical analysis.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 44

Inclusion Criteria

Patients to welling to participate in the study.
Patients are 18 years or above.
Non-contributory medical history (Patient can be seen for regular dental appointment in PDM; ASA classes I and II).
Tooth requiring root canal treatment with radiographic presence of periapical radiolucency and responding to thermal sensitivity testing negatively (difluordichlormethane at 50 °C) (Endo-Ice, Coltène/Whaledent Inc., Cuyahoga Falls, Ohio) and Negatively to EPT testing.
Tooth with adequate remaining tooth structure for proper isolation with rubber dam.
No history of previous endodontic treatment on the tooth.
Teeth with single canal and single and roots with single canals in multirooted teeth.

Exclusion Criteria

Self-reported Pregnancy.
Patients requiring antibiotic premedication prior to dental treatment.
Patients with multiple drug allergies.
Patients with known hypersensitivity to Ferumoxytol nanoparticles or any iron products.
Patients who are scheduled for MRI for the head region within three months after Fer nanoparticles application.
Periodontal changes (pockets 3 mm, mobility Grade I or gingival edema).
Radiographic presence of resorptive processes.
Cracked and fractured teeth.
if one of the inclusion criteria is not met

Study & Design

Study Type: INTERVENTIONAL

Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Iron oxide nanoparticles treatment Ferumoxytol/H2O2	supplementary irrigation	After access preparation with sterile burs and sterile saline irrigation and working length determination as part of routine root canal treatment, and after obtaining a pre-treatment bacteriological samples, 2 mL of a mixture of Ferumoxytol (6mg/mL)/H2O2(3%) was introduced into the canal. Canals were instrumented with 15/0.04, 20/0.04, and 25/0.04 rotary files using 2 mL of treatment solution after each file with a total of 8 mL of solution used and a total contact time of 10 minutes.
Sodium Hypochlorite (NaOCl)	NaOCl	After access preparation with sterile burs and sterile saline irrigation and working length determination as part of routine root canal treatment, and after obtaining a pre-treatment bacteriological samples, 2 mL of 3% NaOCl was introduced into the canal. Canals were instrumented with 15/0.04, 20/0.04, and 25/0.04 rotary files using 2 mL of solution after each file with a total of 8 mL of treatment solution used and a total contact time of 10 minutes.
Sodium Hypochlorite (NaOCl)	supplementary irrigation	After access preparation with sterile burs and sterile saline irrigation and working length determination as part of routine root canal treatment, and after obtaining a pre-treatment bacteriological samples, 2 mL of 3% NaOCl was introduced into the canal. Canals were instrumented with 15/0.04, 20/0.04, and 25/0.04 rotary files using 2 mL of solution after each file with a total of 8 mL of treatment solution used and a total contact time of 10 minutes.
Saline (NaCl)	NaCl	After access preparation with sterile burs and sterile saline irrigation and working length determination as part of routine root canal treatment, and after obtaining a pre-treatment bacteriological samples, 2 mL of 0.89% NaCl was introduced into the canal. Canals were instrumented with 15/0.04, 20/0.04, and 25/0.04 rotary files using 2 mL of treatment solution after each file with a total of 8 mL of solution used and a total contact time of 10 minutes.
Saline (NaCl)	supplementary irrigation	After access preparation with sterile burs and sterile saline irrigation and working length determination as part of routine root canal treatment, and after obtaining a pre-treatment bacteriological samples, 2 mL of 0.89% NaCl was introduced into the canal. Canals were instrumented with 15/0.04, 20/0.04, and 25/0.04 rotary files using 2 mL of treatment solution after each file with a total of 8 mL of solution used and a total contact time of 10 minutes.
Iron oxide nanoparticles treatment Ferumoxytol/H2O2	Iron oxide nanoparticles treatment Ferumoxytol/H2O2	After access preparation with sterile burs and sterile saline irrigation and working length determination as part of routine root canal treatment, and after obtaining a pre-treatment bacteriological samples, 2 mL of a mixture of Ferumoxytol (6mg/mL)/H2O2(3%) was introduced into the canal. Canals were instrumented with 15/0.04, 20/0.04, and 25/0.04 rotary files using 2 mL of treatment solution after each file with a total of 8 mL of solution used and a total contact time of 10 minutes.

Primary Outcome Measures

Name	Time	Method
The Primary Outcome Parameter Will be the Difference in Bacterial Reduction Between the Experimental and Control Disinfection Groups Group (Ferumoxytol) and Comparison Groups (Positive and Negative Controls).	baseline (pretreatment) and after 10 minutes of treatment (post treatment)	This study is designed to evaluate the antibacterial efficacy of Ferumoxytol/H2O2 and to compare it to the gold standard disinfection solution (NaOCl) and negative control solution (NaCl). The outcome will be evaluated by taking bacterial samples from the root canals during routine root canal treatment before and after applying different disinfection protocols. The disinfection efficacy was calculated by comparing the difference in microbial CFU reduction (post treatment sample/pretreatment sample) between the three disinfection protocols

Secondary Outcome Measures

Name	Time	Method
The Effect of Additional (Supplementary) Irrigation and Adjunctive Irrigant (NaOCl) Activation Using Passive Ultrasonic Activation After Irrigation With Experimental and Control Irrigants.	the baseline of this measurement starts right after treatment with either experimental, negative or positive control agent (S2). This measurement ends after irrigating the canals with NaOCl and irritant activation for 3 minutes.	All groups received an additional irrigation step with NaOCl with passive ultrasonic activation. An additional step was included for all the test groups to evaluate if further irrigation after (S2) will lead to more reduction of bacterial counts inside the root canal system. This could inform future experiments evaluating the possibility of synergistic antimicrobial effects for the sequential ferumoxytol and NaOCl treatment.
The Overall Effect of Antimicrobial Irrigation of Infected Root Canals Using Experimental and Control Irrigants, in Addition to Supplementary Irrigant (NaOCl) Activation.	This measure starts at baseline (pretreatment) (S1). This measure ends after 10 minutes of treatment with either experimental, positive or negative control irrigants and additional 3 minutes of supplementary irrigation (S3)	All groups received treated with either Experimental (ferumoxytol), NaOCl (positive control) or Saline (NaCl, negative control). Followed by supplementary irrigation and activation. This could inform future experiments evaluating the possibility of synergistic antimicrobial effects for the sequential ferumoxytol and NaOCl treatment.