The Effect of Smoking on Peri-implantitis

Evaluation of the Role of Smoking in the Peri-implantitis Pathogenesis

the primary aim of this project is to evaluate the microbiological and inflammatory effect of smoking status and smoking severity on periimplantitis lesions. The secondary aim is to compare the effect of smoking on periimplantitis and periodontal microbiota and inflammation in the same individuals.

There will include 96 patients, equally divided into four groups: Smokers with peri-implantitis (n=24), non-smoker individuals with peri-implantitis (n=24), smokers with healthy peri-implant tissues (n=24), non-smoker individuals with healthy peri-implant tissues (n=24).

Microbiological and biochemical analyses will be performed on the samples taken.

Study Overview

• Status: Not yet recruiting
• Conditions: Microbial Colonization; Cytokines; Periimplantitis
• Intervention / Treatment: Other: Recruiting samples

Detailed Description

The cross-sectional study will be carried out in collaboration with the Departments of Periodontology in the Faculty of Dentistry at Bern University, Switzerland, Hatay Mustafa Kemal University, Dokuz Eylul University, Gazi University, and Ege University, Turkey. The first step of the study will be carried out in Turkey, and the second step in Switzerland. Since Hatay is one of the three provinces most affected by the 2023 earthquake in Turkey and Hatay Mustafa Kemal University Dental School was severely damaged, it is impossible to recruit samples from the patients in Hatay. Therefore, this project has been planned as a multicenter, and patient samples will be recruited from the Dokuz Eylül, Gazi University, and Ege University, Department of Periodontology, Faculty of Dentistry. The samples will be analyzed in the Laboratory of Oral Microbiology, Department of Periodontology, University of Bern, Switzerland. The study protocol was approved by the Ethics Committee for the Use of Human Subjects in Research of Dokuz Eylul University (Protocol No: 2023/GOA-8246).

This study will include 96 patients, equally divided into four groups:

• Smokers with peri-implantitis
• Non-smoker individuals with peri-implantitis
• Smokers with healthy peri-implant tissues
• Non-smoker individuals with healthy peri-implant tissues

Smoking status will be categorized into two groups: smoker and non-smoker (never smoker). The non-smoker group will include former smokers who stopped smoking at least 6 years ago.

The cigarettes smoked per day, smoking index (self-reported average cigarettes per day x years of tobacco use), and smoking pocket year will be calculated (self-reported average cigarettes per day x years of tobacco use / the number of cigarettes in a pocket). Smoking status will be detected according to self-report. Smoking status will be later validated by saliva cotinine levels. Salivary cotinine concentration for smoking will be accepted at 5-7 ng/ml. Smoking severity will be determined by higher concentrations.

Periodontal Parameters Clinical periodontal measurements will be assessed using the following for periodontal diagnosis. The measurements will performed using a Williams periodontal probe (Hu-Friedy, Chicago, IL, USA) and include probing pocket depth (PPD), clinical attachment level (CAL), plaque index (PI) 26, gingival index (GI) 27, and percentage bleeding on probing (BOP) 28 at six sites per tooth (mesio-buccal, buccal, disto-buccal, mesio-lingual, lingual and disto-lingual) on each tooth.

Diagnosis of periodontal diseases and conditions will be made according to the radiographic and clinical diagnostic criteria proposed by the 2017 World Workshop on Classification of Periodontal and Peri-implant Diseases and Conditions.29 Peri-implant health will be assessed by the absence of visual signs of inflammation, bleeding on probing, and further bone loss following initial healing, which should not be ≥2 mm. The criteria for patients with periimplantitis will be PPD≥6 mm in conjunction with profuse bleeding and ≥3 mm bone loss.

Patient demographics and clinical periodontal/peri-implant examination

The following variables will be collected:

• Gender
• Age
• BMI
• Implant age
• Number and location of implants
• Surgical phase steps
• Complications related to implant treatment
• Implant malposition
• Implant Mobility and Discomfort (differences in Periotest values-PTVs)
• Time from loading of implants to current examination (time in function)
• Restorative design
• Prosthesis retention
• Radiographic bone level
• Kind and size of bone defect
• Presence of keratinized mucosa
• Frequency of dental brushing
• Interproximal flossing/brushing
• Frequency of dental appointment
• History of periodontitis
• Reason for tooth loss
• Use of alcohol

Collection of Saliva

Saliva samples will be obtained from patients as unstimulated. Samples will be obtained over 10 min when the participants will be seated. The samples will be kept at -80°C until being transferred to the Department of Periodontology, School of Dental Medicine, University of Bern, in dry ice for the analyses.

Collection of Plaque Samples

Plaque samples will be taken from the periimplantitis and periodontitis subgingival area in the periimplantitis group, and the periodontal healthy and peri-implant health subgingival area in the peri-implant health groups. Subgingival implant and dental plaque samples will be collected from the two deepest periodontal pockets and peri-implant pockets within 200 μl RNAlater in Eppendorf tubes. The sampling sites will be isolated from saliva and slightly air dried. The sample will be collected using a sterile Gracey curette (HuFriedy, Rotterdam, Netherlands). The samples will be taken from the peri-implant health area by the same method in the periimplant health group. Eppendorf microcentrifuge tubes will be stored at -80 °C until being transferred to the Institute of Dentistry, Bern University, in dry ice for the analyses.

Collection of Gingival Crevicular Fluid (GCF) and Peri-implant Sulcus Fluid (PISF) Samples

The samples will be taken from two deepest peri-implant pockets and two deepest periodontal pockets from peri-implantitis patients. Saliva contamination will be avoided by isolating each area with cotton rolls and dehydrating slightly with air. Plaque will be gently removed using a periodontal curette. Using the orifice method, 39 the samples will be obtained within 30 seconds with standardized paper strips (Periopaper; Oraflow Inc., Plainview, NY). The volumes will be measured on a precalibrated electronic gingival fluid measuring device (Oraflow Inc., Plainview, NY). 40 The readings from the electronic device will be converted to an actual volume (μl) by reference to a standard curve. Samples contaminated with blood or saliva will be excluded. All six Periopaper strips will be pooled in plastic Eppendorf microcentrifuge tubes and stored at -80 °C until being transferred to the Institute of Dentistry, Bern University, in dry ice for the analyses.

Laboratory Analyses

Saliva and plaque samples will be transferred to the Laboratory of Oral Microbiology, Department of Periodontology, School of Dental Medicine, University of Bern and all laboratory analyses will be performed by Dr. Aysegul Sari at the Laboratory of Oral Microbiology, Department of Periodontology, School of Dental Medicine, University of Bern, Switzerland after the material transfer agreement is signed.

Biochemical Analysis

Patients' smoking status will be determined by cotinine analysis using an enzyme immunoassay kit in the saliva samples.

Microbiological analysis

The presence and abundance of Fusobacterium nucleatum, Campylobacter rectus, Prevotella intermedia, Aggregatinacter actinomycetemcomitans, Porphyromonas gingivalis, Tannerella forsythia, Treponema denticola, Saccharibacteria (TM7), Streptococcus aureus, and Actinomyces oris, will be analyzed in plaque samples. The targeted identification of these bacteria will be made by Real Time Q-PCR. 16sRNA sequencing will be used for an unbiased and untargeted microbiological analysis. Total genomic DNA will be extracted, and then amplification of the 16S rRNA will be performed.

GCF analysis

GCF analysis is planned as a second study. Luminex bead-based multiplex immunoassay will be used to carry out the analysis of GCF and saliva samples. GCF and saliva markers were broadly selected according to previous literature as oxidative stress markers 8-OHdG, PARK7/DJ-1, and NADPH oxidase inflammatory markers IL-1beta, IL-17A/E, osteoprotegerin (OPG); connective tissue degradation markers MMP-8, MMP-3; repair/regeneration markers bone morphogenic protein (BMP)-2, epidermal growth factor (EGF), and vascular endothelial growth factor (VEGF).

Statistical Analysis

Since there is no similar study in the literature, the sample calculation was made on the effect size. The necessary sample size was 24 for each group to detect a significant difference at an effect size (large effect size) of 0.4 and a power level of 90% with a 95% confidence level between the four groups. Gpower package version 3.1 was used for sample size calculations. The normality of continuous variables will be evaluated by Shapiro-Wilk's test. Nonparametric statistical methods will be performed for values with skewed distribution. Kruskal-Wallis test will be performed to compare more than two non-normally distributed variables, and Dunn multiple comparison test for post hoc pairwise multiple comparison analyses. A oneway ANOVA test will be performed to compare more than two normally distributed groups, and the Tukey test will be performed for post hoc pairwise multiple comparison analyses. General linear models will be performed to determine the effect of smoking severity on periimplant and periodontal disease.

• Study Type: Observational
• Enrollment (Estimated): 96

Contacts and Locations

• Study Contact: Name: Clinical assistant professor; Phone Number: 0+3262456060 +905321732518; Email: aysglsr@gmail.com
• Study Contact Backup: Name: Head of peridotontology department; Phone Number: +905055428513; Email: aliyeakcali@hotmail.com

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: Yes

• Sampling Method: Non-Probability Sample

Study Population

The patients, who come to the Dokuz Eylül, Gazi, and Ege University, Faculty of Dentistry, Department of Periodontology for routine periodontal control or treatment, will be included in the study.

Description

The inclusion criteria for study groups:

• 18 years old
• Body mass index (BMI) £30 kg/m
• Presence of min 1 implant and 1 tooth for the implant groups
• At least 1 year of implant loading for implant groups for the implant groups

Exclusion criteria for study groups:

• Systemic diseases such as diabetes mellitus, hepatic or renal disease, or other medical conditions or transmittable diseases (ASA score III, IV, V)
• Pregnancy
• Having undergone antibiotics in the previous 6 months
• Periodontal treatment in the previous 6 months

Study Plan

How is the study designed?

Number of groups / cohorts

4

Cohorts and Interventions

Group / Cohort	Intervention / Treatment
Smokers with peri-implantitis; 24 patients with smokers with peri-implantitis were included in this group.	Other: Recruiting samples; The GCF, plaque, and saliva samples will recruited from participants.
Non-smoker individuals with peri-implantitis; 24 patients with non-smokers with peri-implantitis were included in this group.	Other: Recruiting samples; The GCF, plaque, and saliva samples will recruited from participants.
Smokers with healthy peri-implant tissues; 24 patients with smokers with healthy peri-implant tissues were included in this group.	Other: Recruiting samples; The GCF, plaque, and saliva samples will recruited from participants.
Non-smoker individuals with healthy peri-implant tissues; 24 patients with non-smokers with healthy peri-implant tissues were included in this group.	Other: Recruiting samples; The GCF, plaque, and saliva samples will recruited from participants.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
The evaluation of the abundance of Fusobacterium nucleatum	The presence and abundance of Fusobacterium nucleatum will be analysed by real-time Q-PCR in plaque samples	2 months
The evaluation of the abundance of Campylobacter rectus in plaque samples	The presence and abundance of Campylobacter rectus will be analysed by real-time Q-PCR in plaque samples	2 months
The evaluation of the abundance of Prevotella intermedia in plaque samples	The presence and abundance of Prevotella intermedia will be analysed by real-time Q-PCR in plaque samplse	2 months
The evaluation of the abundance of Aggregatinacter actinomycetemcomitans in plaque samples	The presence and abundance of Aggregatinacter actinomycetemcomitans will be analysed by real-time Q-PCR in plaque samples	2 months
The evaluation of the abundance of Porphyromonas gingivalis in plaque samples	The presence and abundance of Porphyromonas gingivalis will be analysed by real-time Q-PCR in plaque samples	2 months
The evaluation of the abundance of Tannerella forsythia in plaque samples	The presence and abundance of Tannerella forsythia will be analysed by real-time Q-PCR in plaque samples	2 months
The evaluation of the abundance of Treponema denticola in plaque samples	The presence and abundance of Treponema denticola will be analysed by real-time Q-PCR in plaque samples	2 months
The evaluation of the abundance of Saccharibacteria (TM7) in plaque samples	The presence and abundance of Saccharibacteria (TM7) will be analyzed by real-time Q-PCR in plaque samplse	2 months
The evaluation of the abundance of Streptococcus aureus in plaque samples	The presence and abundance of Streptococcus aureus will be analysed by real-time Q-PCR in plaque samples	2 months
The evaluation of the abundance of Actinomyces oris in plaque samples	The presence and abundance of Actinomyces oris will be analysed by real-time Q-PCR in plaque samples	2 months

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
The evaluation of 8-OHdG, PARK7/DJ-1, and NADPH oxidase levels in GCF and saliva samples	The concentrations of 8-OHdG will be analysed by multiplex bead immunoassay method in GCF and saliva	2 months
The evaluation of IL-1beta, IL-17A/E, and osteoprotegerin (OPG) levels in GCF and saliva samples	The concentrations of IL-1beta, IL-17A/E, osteoprotegerin (OPG) levels will be analysed by multiplex bead immunoassay method	2 months
The evaluation of MMP-8 and MMP-3 levels in GCF and saliva samples	The concentrations of MMP-8, MMP-3 will be analysed by multiplex bead immunoassay method	2 months
The evaluation of bone morphogenic protein (BMP)-2, epidermal growth factor (EGF), and vascular endothelial growth factor (VEGF) levels in GCF and saliva samples	The concentrations of bone morphogenic protein (BMP)-2, epidermal growth factor (EGF), and vascular endothelial growth factor (VEGF) will be analysed by multiplex bead immunoassay method	2 months

Collaborators and Investigators

• Sponsor: Mustafa Kemal University
• Collaborators: Gazi University; University of Bern; Dokuz Eylul University
• Investigators: Study Director: Alpdogan Kantarci, Prof, Forsyth Institute; Study Chair: Anton Sculean, Prof, University of Bern; Study Chair: Berrin Unsal, Prof, Gazi University; Study Chair: Aliye Akcali, Prof, Dokuz Eylül University; Principal Investigator: Aysegul Sari, PhD, Mustafa Kemal University

Publications and helpful links

General Publications

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• Koldsland OC, Scheie AA, Aass AM. The association between selected risk indicators and severity of peri-implantitis using mixed model analyses. J Clin Periodontol. 2011 Mar;38(3):285-92. doi: 10.1111/j.1600-051X.2010.01659.x. Epub 2010 Dec 15.
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• Farronato D, Azzi L, Giboli L, Maurino V, Tartaglia GM, Farronato M. Impact of Smoking Habit on Peri-Implant Indicators following Different Therapies: A Systematic Review. Bioengineering (Basel). 2022 Oct 18;9(10):569. doi: 10.3390/bioengineering9100569.
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Study record dates

Study Major Dates

• Study Start (Estimated): November 21, 2023
• Primary Completion (Estimated): December 15, 2024
• Study Completion (Estimated): December 15, 2025

Study Registration Dates

• First Submitted: October 17, 2023
• First Submitted That Met QC Criteria: November 20, 2023
• First Posted (Actual): November 29, 2023

Study Record Updates

• Last Update Posted (Actual): November 29, 2023
• Last Update Submitted That Met QC Criteria: November 20, 2023
• Last Verified: November 1, 2023

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Pathologic Processes; Disease Attributes; Stomatognathic Diseases; Periodontal Diseases; Mouth Diseases; Infections; Communicable Diseases; Peri-Implantitis
• Other Study ID Numbers: 2023/GOA-8246

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: UNDECIDED

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No