Inflammation surrounding an implant may gradually contribute to implant failure. Though peri-implant mucositis and peri-implantitis differ in site and clinical severity, both pathologies, from a diagnostic and pathogenesis standpoint, are fundamentally the same.1 Uncorrected peri-implant mucositis is previously reported to be associated with a high incidence of peri-implantitis.2 This highlights the importance of eliminating peri-implant mucositis as a preventive approach to peri-implantitis.
Basic peri-implant maintenance therapy (PIMT) is a crucial component of successful implant treatment, where the suggested reasonable interval is 5 or 6 months.  However, this does vary and is hence customized to fit each patient, depending on important clinical factors such as history of periodontal disease.4 Many therapeutic and adjunctive procedures for implant maintenance, such as mechanical debridement,5 photodynamic therapy,5 Er:YAG laser,6 and sub gingival glycine air polishing5 have been previously investigated. Amongst the recent adjunctive therapeutic approaches to PIMT, orally-administered probiotics, has gained clinical spotlight. Probiotics represent a new area of research in oral medicine, with potential role in protecting oral tissue from cariogenic bacteria and periodontal pathogenesis.7-8 Oral probiotics create biofilm on implant surface what is important etiological factor for protection of the peri-implant tissue agent’s action of periodontal pathogenic bacteria.9 In this uncontrolled clinical study we evaluated the effects of orally-administered probiotics on the peri-implant health of patients with dental implants.
MATERIALS AND METHODS
Patient Selection: A total of 40 patients with implant-supported fixed prosthetic restoration (crowns and bridges) in the upper and lower jaw were consecutively recruited following informed consent. The study was reviewed and approved by the institutes’ ethics committee. Each of the 40 selected patients were considered as a statistical unit. Candidates were admitted into the study after they fulfil the inclusion and exclusion criteria as mentioned in Table 1.
Clinical Assessment: Following the collection of informed consent, baseline measurements related to the implants were recorded. These measurements included:
Probing Pocket Depth (PD): It was recorded in millimetres (mm) as the distance between the gingival margins to the base of the peri-implant sulcus using a Williams periodontal probe with 1-2-3-4-5-7-9-10 mm markings (Hu-Friedy, Chicago, IL. USA). Measurements were collected from six sites around the implant (i.e., mesiolingual, midlingual, distolingual, mesiobuccal, midbuccal and distobuccal).
Implant Plaque Index (IPI): Biofilm formation in the marginal area of dental implants was recorded according to a 3-point scale10 (0- No visible plaque; 1- Local plaque accumulation, 2- General plaque accumulation greater than 25%).
Implant Bleeding on Probing (BoP): It was recorded using dichotomous value depending on whether the site presented bleeding or not (1 - Bleeding and 0 - No bleeding). Gentle probing (<0.25N)  was performed using Williams periodontal probe and the observation was recorded 30s after probing.
Implant Stability (IS): Implant stability was measured using resonance frequency analysis, Osstel IDx (Osstell, Sweden). The fixed restorations were unscrewed from the implants and the Smart Peg (Type 54) has been fixed via a torque of 10Ncm with Smart Peg Mount. The Osstell IDx probe was placed perpendicular to the Smart Peg at a maximum distance of 2mm. After recording the measurement value, the fixed restorations were fixed back onto the implant with a torque of 15Ncm. All data were recorded on the Osstell IDx database.
Radio graphical Assessment: The peri-implant marginal bone level (MBL) were recorded using a periapical X-ray obtained using RXCC intraoral X-ray unite (MyRay, Imola, Bologna, Italy) standardized using a sensor holder with the individually customized occlusal impression of each patient. Exposure time of 0.8s was performed. The distance between the abutment shoulder and alveolar crest was measured mesially and distally in millimetres (mm).
Schedule of Events: All measurements were performed in Dental Department of Advance Europe Medical Centre (Sharjah, UAE). After the base line clinical and radiological examination, oral probiotic lozenges (Hyperbiotics Pro-Dental, USA) were administered (one tablet every 24 hr) for 90 days. All the subjects were asked to participate clinical evaluation on baseline, 30 and 90 days following probiotic administration.
Statistical Analysis: All data were first analysed by descriptive methods (QQ plots, box plots) (SPSS 18.0; SPSS, Austin, TX, USA). The patients were chosen as the unit for statistical analysis. The Wilcoxon signed rank test was used as well as Pearson’s coefficient of correlation. The level of significance chosen in all statistical test was at P < 0.05.
Totally 40 patients (12 women and 28 men) with mean age of 43.81±1.73 (Age ranges from 23-65 years) completed the study. 52 bone level tapered implants (Straumann AG, Basel, Switzerland) to support screw retained full ceramic restorations (34 patients with solo crowns and 6 patients with three-unites bridges) were analysed in this study (Figure 1 and 2).
Statistically significant differences were presented for parameters Implant plaque index (IPI) and bleeding on probing (BoP) between base line and time-point 90 days (Table 2). General plaque accumulation greater than 25% was observed in one patient (2.5%) at baseline. While local plaque accumulation (IPI point 1) was observed in 29 patients (72.5%). Absence of plaque accumulation was observed in 25 patients (62.5%), ninety days after using oral probiotics. BoP at baseline was observed during probing in 29 of 40 patients (72.5%). This number was significantly reduced to 22.5% after 90 days of using oral probiotic lozenges.
|Parameter||Base line||30 days||90 days|
|IPI||0.77± 0.21||0.62 ± 0.15||0.37±0.18|
|BoP||0.85 ± 0.23||0.72 ± 0.21||0.22±0.19|
We didn’t observe any statistical differences (p>0.05) between mean values of clinical parameters (PD, IS) and marginal bone level MBL when compared together at baseline, 30 and 90 days (Table 3). The mean probing depth (PD) calculated from probing depths at six sites per implant was 2.3mm (varying from 1 to 4 mm), 2.1mm and 2.0mm at baseline 30 days and 90 days respectively post probiotic administration. On baseline measured implant stability (IS) mean value of all fifty-two implants was 72.53 ISQ (ranging from 65 to 78 ISQ). We didn’t observe decreasing of implant stability during the study. Marginal bone level (MBL) calculated using the average distance between implant shoulder and alveolar crest mesially and distally of each implant was 2.73 mm (ranging from 1 to 4 mm) and remained similar at 30th day (2.68 mm) and 90th day (2.62 mm).
Peri-implantitis is an irreversible inflammatory disease that affects both the soft and hard tissues of a dental implant. If left untreated, it will result in implant failure in most instances. The most common cause of peri-implantitis is the accumulation of dental plaque and formation of a bacterial biofilm on the implant surface.11-15 Treatment of peri-implantitis will differ depending upon whether it is a case of peri-implant mucositis or peri-implantitis. The management of implant infection should be focused on the control of infection, the detoxification of the implant surface, and regeneration of the alveolar bone. Therefore, adjunctive peri-implant therapies, such as antibiotics, antiseptics, and ultrasonic and laser treatments, have been proposed to improve the non-surgical treatment options of peri-implant mucositis and peri-implantitis. Regenerative procedures using a bone graft substitute in combination with a membrane have been proposed to treat bone defects in advanced cases of peri-implantitis. Sustaining healthy oral micro biome is the fundamental to preventing plaque accumulation that further modulate host immune inflammatory events around the dental implant. Plethora of clinical studies has established that Probiotics can influence oral health through interaction with oral micro biome.
The present study was hence designed to evaluate the efficacy of oral probiotics (Hyperbiotics Pro-Dental, USA) on dental implants along with routine standard plaque control measure in active peri-implantitis patients in 3-month clinical follow up. The significant reduction in Implant plaque index (IPI) and bleeding on probing (BoP) was observed as the clinical outcome of probiotic application in this study. Significant reduction in plaque index and absence of bleeding on probing are the key components to establish the health and longevity of dental implants. The results of this study are consistent with previous studies evaluating the orally administered probiotics for preventing inflammation by affecting host responses in peri-implantitis patients.8,16-17 In this study the orally administered probiotic (Hyperbiotics Pro-Dental, USA) was safely accepted by all the subjects and we didn’t observe any adverse effects in any of the subjects in this study.
This study shows the clinical significance of orally-administered probiotics (Hyperbiotics Pro-Dental, USA) on the implant plaque accumulation and bleeding on probing in patients with dental implants. The long-term effects of oral-administrated probiotics can significantly increase the chances of implant success especially among patients who develop peri-implantitis.