Surgical Protocol for Peri-Implantitis Treatment-4

Study Overview
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Brief Summary
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Peri-implant diseases are common post-restorative complications in implant rehabilitations and they occur with an incidence of 12-43%. Based on the available data in literature, the surgical therapy for peri-implantitis is effective in disease resolution. Surgical access to peri-implant lesions facilitates the removal of all granulation tissue from the defect area as well as debridement and decontamination of the exposed implant surface defect area. Different techniques have been used for implant surface decontamination during peri-implant surgery, including mechanical, chemical and laser treatments.

Detailed Description
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Peri-implantitis are defined as inflammatory diseases caused by bacterial biofilm around implant surface characterized by bleeding on probing, probing depth and eventually bone loss; if not successfully treated they may lead to implant loss. Based on the available parameters that have been reported in literature non surgical therapy doesn't seem to be effective on peri-implantitis. Therefore it is recommended to consider advanced therapies such as surgical interventions when non surgical peri-implant therapy fails to achieve significant improvements in clinical parameters. Numerous approaches have been used for implant surface decontamination during per-implant surgery, including mechanical, chemical and laser treatments. Conventional mechanical means don't seem to be effective on peri-implant diseases. In addition, the rough implant surface is a retentive factor for bacterial colonization and therefore makes implant surface difficult to debride. Another problem in maintaining implant health concerns the presence or absence of keratinised tissue around implant: if present, it seams to help the patient to maintain an optimal level of oral hygiene around implant and therefore the implant survival itself. The aim of the present randomized controlled clinical trial is to assess the influence of keratinised tissue around implant in improving clinical parameters. In particular, implant surface will be decontaminated mechanically with titanium curettes and chemically using chlorhexidine; after this the bone defect will be filled with bio-materlal and a CTG around tissue implant will be randomized.

Official Title
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Surgical Protocol for Peri-implantitis in Vertical Defect in Absence of Keratinised Tissue Using Chemical Decontamination With Chlorexidine and a CTG: a Randomized Clinical Trial

Conditions
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Peri-Implantitis

Intervention / Treatment
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* Procedure: Chlorhexidine
* Procedure: CTG


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: presence of at least one screw-type titanium implant exhibiting bleeding and/or suppuration on probing combined with: PPD ≥ 5 mm and bone loss ≥ 2 mm (compared to crestal bone levels at the time of placement of the reconstruction) PPD ≥6 and bone loss ≥3 (not compared to crestal bone levels at the time of placement of the reconstruction) single tooth and bridgework restorations without overhangs no evidence of occlusal overload (i.e. occlusal contacts revealed appropriate adjustment) treated chronic periodontitis and proper periodontal maintenance care FMPS < 20% non-smoker or light smoking status in smokers (<10 cigarettes per day) implant function time ≥ 1 year. Exclusion Criteria: Patients with uncontrolled diabetes patients with osteoporosis or under bisphosphonate medication, pregnant or lactating women patients with a history of radiotherapy to the head and neck region hollow implants implant mobility implants at which no position could be identified where proper probing measurements could be performed; previous surgical treatment of the peri-implantitis lesions

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 100 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Sham Comparator: Chlorhexidine<br>Access flap will be raised to gain access to the implant surface. Inflammatory tissue, excess cement or plaque deposits will be removed using titanium curettes and the implant surface will be cleaned by copious irrigation with sterile saline and surgical gauze soaked in Chlorhexidine | Procedure: Chlorhexidine<br>* Inflammatory tissue, excess cement or plaque deposits will be removed using titanium curettes and the implant surface will be cleaned by copious irrigation with sterile saline and surgical gauze soaked in chlorhexidine<br>|
| Other: Connective Tissue Graft<br>CTG will be positioned in the buccal aspect of the peri-implant tissue | Procedure: Chlorhexidine<br>* Inflammatory tissue, excess cement or plaque deposits will be removed using titanium curettes and the implant surface will be cleaned by copious irrigation with sterile saline and surgical gauze soaked in chlorhexidine<br>Procedure: CTG<br>* CTG will be positioned in the buccal aspect of the peri-implant tissue<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Bleeding on probing changes | changes of bleeding on probing, evaluated as present if bleeding will be evident within 30 s after probing, or absent, if no bleeding will be noticed within 30 s after probing | baseline, 3, 6 and 12 months after treatment | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| clinical attachment level changes | changes in clinical attachment level, measured from CEJ to the tip of the probe | baseline, 3, 6 and 12 months after treatment | 
| probing pocket depth changes | changes in probing depth probing, measured from gingival margin to te tip of the probe | baseline, 3, 6 and 12 months after treatment | 
| mucosal recession changes | changes in mucosal recession, measured from CEJ to gingival margin | baseline, 3, 6 and 12 months after treatment | 
| bone level changes | changes in bone level at mesial and distal aspect, measured on periapical X-ray | baseline, 3, 6 and 12 months after treatment | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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peri-implantitis, CTG, Chlorhexidine, surgical treatment, Keratinised tissue