Post Extraction Alterations Following Ridge Preservation In The Esthetic Zone Using Partially Demineralized Autogenous Dentine Graft Versus Xenograft

The study aims to radiographically evaluate the dimentionsal changes of hard tissue after application of partailly deminerlized dentin graft verus xenograft in the esthatic zone .

Research Procedure in brief:

The study is to be conducted in the Oral Medicine and Periodontology department, Faculty of Dentistry- Cairo University, Egypt.Patients are to be selected from the outpatient clinic of the department of Oral Medicine and Periodontology, clinic of the department of Oral surgery and clinic of the department of Endodontics -Cairo University. The initial therapy consists of periodontal treatment (phase I therapy) including supragingival scaling, subgingival debridement if needed, adjustment of faulty restoration and polishing. The mechanical plaque control instructions for each patient include brushing and interdental cleaning techniques. surgical interventions: Atraumatic extraction.The patient will rinse their mouth with 0.12% Chlorhexidine Administration of 4% articaine hydrochloride with 1:100,000 epinephrine will be as local anesthetic agent.Flapless and atraumatic tooth extraction will be initiated, using 15C blade intrasulcular incision will be performed.A periotome will be utilized to sever the periodontal ligament (PDL) fibers, followed by extraction witha straight elevator and extraction forceps.

In the test group:

The autogenous partially demineralized dentin graft will be prepared as follows:

A high-speed fine finishing stone and saline irrigation will be used to clean the tooth and remove any decay, restoration, or foreign materials. Tooth will be rinsed twice in phosphate buffered saline. The tooth will be dried using air and ground with the Tooth Transformer device following the manufacturer's protocol. Dentin particles will be obtained with a dimension of 400 - 800 μm .

Preparation of the autogenous partially demineralized dentin matrix

* The extracted tooth will be cleaned with a diamond bur under abundant irrigation with physiological water. All filling materials (gutta-percha, composite, luting cements, etc.) will be removed with the outmost care and under magnification. * Subsequently, the tooth will be cut into fragments (5 × 5 mm) and inserted into the milling device . According to the manufacturer, a disposable box containing disposable liquid solutions will be inserted into the device to ensure the demineralization of the graft with 0.1 M hydrochloric acid, 10% hydrogen peroxide, and demineralized water as a wash. * The decontamination of the granules will take place through UVA rays and ultrasounds, with temperature variations always lower than 43 ◦C to avoid damage to proteins. * After 25 min, particle graft biomaterials will be obtained. The particles size will range from 815 µm with peaks up to 1110 µm. * All bone defects will be filled with the graft obtained from the TT grinder. * Device for Tooth Processing (The Tooth Transformer TT):

Part 1: Tooth Cleaning After extraction, the tooth must be cleaned of tooth decay, tartar, soft tissue debris, fillings, cement, and prosthetic components. For the TT®, which calls for cutting the tooth into sections for the trituration stage .

Part 2: Tooth Grinding The TT® is equipped with a multipurpose sterilizable system that operates at low speed, which makes it possible to avoid the loss of tooth substance during pulverisation, despite the drawback of not being able to enter an entire tooth into the shredder .

Part 3: Treatment by Device The shredder is closed and inserted once the tooth has been placed. When the door is closed and the button is pressed, a liquid cartridge and a cylinder with a granulate collection cup (maker) are placed into the apparatus in their respective housings, the cartridge is activated by punching, and the procedure starts .

In control group:

Xenograft will be prepared in a separate room to keep patients blinded, where the allocated material will be administered 15 minutes after tooth extraction. A xenograft will be implanted in the alveolus.

Alveolar ridge preservation:

Following a thorough cleaning procedure,

Biopsy collection:

After 6 months healing a local anesthesia will be given, a full thickness mucoperiosteal flap will be detached in the augmented areas and a bone biopsy will be collected using a 4 mm trephine bur.

Implant placement:

After 6 months healing a local anesthesia will be given, a full thickness mucoperiosteal flap will be detached in the augmented areas an implant placement with sequences drill will be done.

Postoperative Care and follow up:

Participants will be given instructions to avoid any trauma to the operative site, refrain from interfering with the sutures, and to avoid consuming hot food or engaging in vigorous rinsing.

They will be encouraged to continue tooth brushing for the other parts of their dentition, while gentle tooth brushing for the operative site will be advised to be resumed after a two-week period.

Participants will be prescribed either Amoxicillin 500 mg (Misr Co. for Pharmaceutical Industries, Egypt) three times daily for seven days, or doxycycline 100 mg (Doxymycin, Nile Co. for Pharmaceuticals and Chemical Industries, Egypt) twice daily if they are sensitive to penicillin. In case of severe pain, Ibuprofen 600 mg (Brufen, Kahira Pharmaceuticals, Egypt) will be prescribed. To facilitate gentle rinsing, participants will be instructed to use a 0.12% Chlorhexidine mouthwash twice daily for a duration of two weeks .

The sutures will be removed two weeks after the surgery. On the first day postoperatively, a baseline cone-beam computed tomography (CBCT) scan will be conducted. A final follow-up visit and CBCT scan will be scheduled for six months postoperatively.

• Change in radiographic buccal and palatal ridge height: [Time frame: after 6 months postoperatively.]
• Percentage of new vital bone formation and residual graft [Time frame: after 6 months postoperatively]
• Implant Primary Stability [Time frame: after 6 months postoperatively]