Clinical and Radiographic Evaluation of Chitosan Versus Formocresol After Vital Pulpotomy of Primary Molars

The main goal of pulp therapy is to maintain the integrity and health of the teeth and their supporting tissues while ensuring the vitality of the pulp of a tooth affected by caries, traumatic injury, or other causes.

Formocresol is a favored medicament for pulp therapy due to its proven success as a fixative, disinfectant, and devitalizing agent. For the past 70 years, it has been the most popular agent for vital pulpotomy in deciduous teeth with a success rate between 70-98%. However, concerns were issued about the potential toxic, mutagenic and cytotoxic effects of formocresol use.

Chitosan is a polysaccharide obtained by alkaline de-acetylation of chitin which is a very common natural biopolymer that can be found in the exoskeleton of crustacea. Chitosan is extensively studied in medical and pharmaceutical fields due to its competitive biological properties like biocompatibility, nontoxicity, analgesic, antitumor, hemostatic, antimicrobial, and antioxidant effects that makes it very interesting to develop for application in dentistry

The aim of the study is to evaluate the clinical and radiographical efficacy of chitosan liquid as pulp medicament compared to formocresol in vital pulpotomy of lower deciduous molars.

In this clinical trial, the principal investigator will carry out all treatment procedures, and the patients will be randomly assigned to any of the intervention groups. For both interventions, informed consent will be obtained from parents/guardians of the participating children.

For both interventions (1 experimental arm group and 1 active comparator arm group):

* Diagnosis of the cases will be performed according to guidelines by the American Academy of Pediatric Dentistry for treatment of vital pulp therapy in primary teeth and a diagnostic chart with personal, medical and dental history will be filled. * Clinical examination will be done in the dental clinic using mirror and probe to assess the clinical inclusion criteria. * Preoperative periapical radiographs will be taken to assess the inclusion criteria. Preoperative radiograph will serve as a reference for the follow-up radiographs. * Baseline records (personal data collection, photographs, percussion test and preoperative periapical radiographs) will be taken. * An individual Extension Cone Paralleling index will be prepared for each patient by registering the bite through alginate impression and fabricating an acrylic radiographic stent from the patient's cast to allow consistent comparisons of the radiographs. * Before starting intra-operative procedures, the tooth is allocated randomly (concealed by withdrawing a sealed opaque envelope containing four-folded numbered papers containing the type of dressing material that will be used then writing the patient's name and I.D. on it and will be opened after performing the access cavity). * Apply topical anesthesia. * Local anesthesia administration. * Rubber dam application and access cavity preparation will be established using a sterile bur. * The envelope marked by the patient's name and I.D. will be opened and the tooth will be allocated into either one of the groups alternatively depending on the pulpotomy medicament used either into Group I (Experimental group) or Group II (Control group)

Group I (Experimental group) pulpotomy using chitosan liquid:

1. After complete hemostasis, a cotton pellet damp with chitosan liquid will be applied and gently placed over the pulp stumps for 5 minutes and removed. Then, a thick mix of zinc oxide and eugenol will be placed and gently condensed into the pulp chamber by a moistened cotton pellet. 2. Tooth will be restored with stainless steel crown.

Group II (Control group) pulpotomy using formocresol:

1. After complete hemostasis, a cotton pellet damp with formocresol will be applied and gently placed over the pulp stumps for 5 minutes and removed. Then, a thick mix of zinc oxide and eugenol will be placed and gently condensed into the pulp chamber by a moistened cotton pellet. 2. Tooth will be restored with stainless steel crown.

The participants are recalled for clinical evaluation at the interval of 3, 6, 9, 12 months, and recalled for radiographic evaluation at 6 and 12 months.

• Change from Baseline in regards to swelling at 3 months [Time frame: Baseline and 3 months]
• Change from Baseline in regards to swelling at 6 months [Time frame: Baseline and 6 months]
• Change from Baseline in regards to swelling at 9 months [Time frame: Baseline and 9 months]
• Change from Baseline in regards to swelling at 12 months [Time frame: Baseline and 12 months]
• Change from Baseline in regards to sinus or fistula at 3 months [Time frame: Baseline and 3 months]
• Change from Baseline in regards to sinus or fistula at 6 months [Time frame: Baseline and 6 months]
• Change from Baseline in regards to sinus or fistula at 9 months [Time frame: Baseline and 9 months]
• Change from Baseline in regards to sinus or fistula at 12 months [Time frame: Baseline and 12 months]
• Change from Baseline in regards to furcal lesion at 6 months using Furcation Involvement Scores [Time frame: Baseline and 6 months]
• Change from Baseline in regards to furcal lesion at 12 months using Furcation Involvement Scores [Time frame: Baseline and 12 months]
• Change from Baseline in regards to periapical lesion at 6 months [Time frame: Baseline and 6 months]
• Change from Baseline in regards to periapical lesion at 12 months [Time frame: Baseline and 12 months]