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Year : 2016  |  Volume : 6  |  Issue : 8  |  Page : 153-159
Efficacy of platelet rich fibrin in the treatment of human intrabony defects with or without bone graft: A randomized controlled trial

1 Department of Periodontics, Sree Mookambika Institute of Dental Sciences, Padanilam, Kulasekharam, Kanyakumari, India
2 Department of Periodontics, Sri Hasanamba Dental College and Hospital, Vidyanagar, Hassan, India
3 Sumukha Orofacial and Dental Care, Hassan, Karnataka, India

Date of Submission21-May-2015
Date of Acceptance01-Aug-2016
Date of Web Publication02-Sep-2016

Correspondence Address:
Nikhil D Chandradas
Department of Periodontics, Sree Mookambika Institute of Dental Sciences, Padanilam, Kulasekharam, Kanyakumari, Tamil Nadu
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/2231-0762.189753

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Aim: To evaluate the efficacy of platelet rich fibrin (PRF) with or without bone graft [demineralized bone matrix (DBM) graft] in the treatment of intrabony defects based on clinical and radiographic parameters. Materials and Methods: Thirty six intrabony defects in 36 patients were randomly divided into three different groups and were treated with group A (PRF with DBM) or group B (PRF alone) or group C [open flap debridement (OFD)]. Clinical parameters such as plaque index (PI), gingival index (GI), probing depth (PD), relative attachment level (RAL), and gingival recession (GR) were assessed at baseline and 9 months postoperatively; radiographic parameters such as linear bone growth (LBG) and percentage in bone fill (%BF) were calculated by using the image analysis software. Comparisons of groups were analyzed using Kruskal-Wallis analysis of variance test. Pair-wise comparison of groups was done by Mann-Whitney U test. Results: Mean PD reduction and RAL gain were greater in group A (4.25 ± 1.48, 3.92 ± 0.90) and group B (3.82 ± 0.75, 3.27 ± 0.65) than control (3.00 ± 1.21, 2.25 ± 0.62). Furthermore, statistically significant improvement in LBG and %BF was found in group A (3.47 ± 0.53, 61.53 ± 4.54) compared to group B (2.55 ± 0.61, 49.60 ± 14.08) and group C (1.21 ± 0.80, 24.69 ± 15.59). Conclusions: The study demonstrated that PRF improves clinical and radiological parameters compared to OFD alone in intrabony defects. Addition of DBM enhances the effects of PRF in RAL gain and radiographic defect fill.

Keywords: Chronic periodontitis, clinical trial, periodontal attachment loss, platelet-derived growth factor, regeneration

How to cite this article:
Chandradas ND, Ravindra S, Rangaraju VM, Jain S, Dasappa S. Efficacy of platelet rich fibrin in the treatment of human intrabony defects with or without bone graft: A randomized controlled trial. J Int Soc Prevent Communit Dent 2016;6, Suppl S2:153-9

How to cite this URL:
Chandradas ND, Ravindra S, Rangaraju VM, Jain S, Dasappa S. Efficacy of platelet rich fibrin in the treatment of human intrabony defects with or without bone graft: A randomized controlled trial. J Int Soc Prevent Communit Dent [serial online] 2016 [cited 2022 Dec 5];6, Suppl S2:153-9. Available from: https://www.jispcd.org/text.asp?2016/6/8/153/189753

   Introduction Top

Various biomaterials have been used for the treatment of intrabony defects and have demonstrated variable results. [1] Recently, biological modifiers demonstrated their ability to stimulate cells which are located in periodontal defects and resulted in proliferation and differentiation of periodontal ligament cells. [2] Platelets are considered as a natural source of these growth factors that play a vital role in enhancing wound healing after periodontal treatment. [3] Platelet rich fibrin (PRF), which belongs to second generation platelet concentrate, was first developed in France by Choukroun et al. [4] The natural fibrin clot in PRF seems to be responsible for slow release of growth factors for an extended period. [5] Because of its strict autologous nature, extended growth factor release, and cost-effectiveness, PRF may be considered as a better treatment option compared to platelet rich plasma (PRP) - a first generation platelet concentrate. [6] Even though numerous studies have shown the role of PRF in bone regeneration, the effect of PRF in combination with bone graft is still remaining inconclusive. The purpose of this clinical study was to evaluate the effectiveness of PRF in the treatment of intrabony defects and to assess the ability of bone graft to enhance the regenerative effects of PRF.

   Materials and Methods Top

The present randomized, controlled clinical trial was conducted in the Department of Periodontics, from December 2012 to March 2015. The study was performed according to the Helsinki declaration, and ethical clearance (SHDCH/2012-13/336(4) Dated on 21.11.2012) for the study was obtained from the institutional ethics committee. The participants enrolled for the study were informed verbally, and written consent was obtained before the start of the trial. A total of 38 patients were screened from the outpatient department of periodontics.

Each patient contributed one defect per site. In case of multiple defects, site with deepest probing depth was selected. The sample size was calculated based on the formula. Thirty six intrabony defects were selected (18 males and 18 females, age range: 35-50) based on following inclusion criteria: systemically healthy patients diagnosed with chronic periodontitis based on the international workshop for the classification of periodontal disease, [7] having ≥20 teeth and ≥30% of sites with >4 mm clinical attachment loss (CAL), probing depth (PD) ≥5 mm, and presence of intrabony defect (IBD) ≥3 mm (measured from alveolar crest to the base of the defect on intraoral periapical radiograph). Exclusion criteria were patients with use of tobacco or tobacco-related products; systemic or local application of antibiotics within the previous 6 months; patients with poor oral hygiene (plaque index (PI) ≥3) after the revaluation of cause-related therapy. The present study was conducted for a period of 9 months. After verification of the inclusion criteria, 2 patients were excluded from the screening group as they failed to meet the study protocol. Total 36 patients (sites) were randomly assigned to one of the three treatment regimens, group A, PRF with DBM, group B, PRF alone, and group C, control (OFD) [Figure 1]. Allotment of participants within the groups was performed randomly by creating a randomization list by means of a freeware link (http://www.graphad.com/quickcalcs/randomize1.cfm). The treatment allocation of the patients was prepared and sealed in the numbered opaque envelopes and were opened during surgery immediately after completing the defect debridement. Allocation protocol was unavailable to the periodontal examiner (RS) throughout the study. Patients were masked for allocation to particular group and treatment. All the surgical procedures in three groups were performed by a trained periodontist (NC). The pre and postoperative assessments were performed by another examiner (RS) without knowledge of the nature of intervention.

Clinical parameters

Clinical measurements were performed using the cementoenamel junction (CEJ) or a fixed reference point, when applicable. All measurements were recorded to the nearest millimetre using University of North Carolina no. 15 (UNC-15, Hu-Friedy, Chicago, IL, USA) periodontal probe. Plaque scores were assessed using Silness and Loe [8] PI and gingival condition was assessed with the help of Loe and Silness [9] gingival index (GI). Gingival recession (GR) was measured as the distance from CEJ to the crest of the receded free gingival margin. Probing depth (PD) was measured as the distance from gingival margin to the base of the pocket. An occlusal stent was prepared with cold cure acrylic resin and a groove was made on the stent in relation to each selected tooth to guide the probe position. [10] Relative attachment level (RAL) was measured from apical border of the stent to the base of the pocket. All clinical parameters were assessed by a single examiner. Examiner calibration was conducted in 7 participants with similar clinical situation with an interval of 48 hours. The examiner calibration was found reproducible if measurements were similar to the mm at the ≥90% level.

Radiographic assessment

Intraoral periapical (IOPA) radiographs were obtained by long cone paralleling technique at baseline and 9 months postsurgery using a Flow RAPD right angle positioning device and a size 2 E speed IOPA X-ray film (Kodak intra oral X-ray film, care stream health India private limited, Mumbai) in an X-ray unit (70 kV, 7 mA). Individually customized bite blocks were prepared by asking the patient to bite on putty index along with holder and were used pre and postoperatively to standardize the position of exposure. These radiographs were scanned and computer assisted image analysis of the radiographs was done with the help of AutoCAD image analysis software (2010, Autodesk, India Pvt. Ltd, Mumbai, India) [Figure 2] and [Figure 3]. All radiographic parameters were assessed by the same evaluator who was masked to the surgical intervention performed. The intraexaminer calibration was assessed by performing radiographic measurements in 10 radiographs, not involved in study groups. The anatomical landmarks of the defects were selected based on the criteria set by Schei et al. [11] which include CEJ, alveolar crest (AC), and base of the defect (BD). Defect depth (DD) was assessed by drawing an auxiliary line (AUX 1) parallel to the long axis of the tooth. A second auxiliary line (AUX 2) perpendicular to AUX 1 was drawn from the AC. The DD was measured from the lateral extension of intrabony defect to the point where AUX 2 crossed the root surface to the BD. [12]

The radiographic distance between CEJ to root apex was measured to correct the foreshortening/elongation. If any difference in this measurement existed between baseline and the 9 month radiograph, the measurements were corrected for any distortion. Radiographic parameters evaluated were linear bone growth (LBG) and percentage in bone fill (%BF). LBG was calculated by subtracting the CEJ to the BD value at baseline and 9 months. %BF was calculated by dividing LBG by DD at the baseline.

Surgical therapy

Local anesthesia (2% lidocaine with 1:80000 adrenaline) was administered and bone sounding was done to identify the extension of the defect. Intrasulcuar incisions were given buccally and lingually involving one tooth mesial and distal to the intrabony defect and mucoperiosteal flaps were reflected. Vertical incisions were avoided. After performing meticulous defect debridement, direct measurement of the osseous defect was obtained with UNC-15 periodontal probe.

Plate rich fibrin preparation

The PRF was prepared according to the process protocol developed by Choukroun et al. (2001). [4],[13] Immediately before the surgical procedure, 10 ml intravenous blood was drawn by venipuncturing the antecubital vein. Blood was collected in a sterile glass test tube without any anticoagulant, and centrifuged immediately using a centrifuge (REMI, R-4c, Mumbai, India) at 3000 rpm for 12 min. The fibrin clot (middle) layer was removed along with a small RBC layer at the end of PRF clot to collect as many platelets and leukocytes as possible. [14] In the PRF + DBM group the required amount of DBM with a particle size of 250 microns (Osseograft, advanced biotech, Chennai, India) was mixed with PRF which had been minced into small pieces. The mixture was made into a workable consistency and delivered into the defect. In the PRF group the defects were filled with minced PRF only. The control group defects were treated with OFD only. The flaps were secured with interrupted 3-0 black braided silk sutures (Ethicon, Johnson and Johnson Ltd., Somerville, NJ, USA). The surgical area was protected with a non-eugenol pack (Coe Pack, GC, America Inc. Alsp, IL, USA).

Postoperative treatment

The patients were prescribed systemic antibiotic (Amoxicillin 500 mg) for 5 days and analgesics (Ibuprofen 400 mg + Paracetamol 500 mg) three times per day. Patients were instructed to avoid brushing, flossing and chewing in the surgical area for a period of 2-3 weeks. All the patients were instructed to use 0.2% chlorhexidine rinses twice daily for 2 weeks. Sutures were removed 1 week postoperatively.

Statistical analysis

The sample size was set a priori at 12 patients per group with a power of 80% based on the results of previous randomized controlled study. [15] Clinical and radiographic measurements for each group are presented as mean ± SD. The net difference between each pair of measurements (pre and postoperative) was calculated, followed by computation of the difference among treatment groups. Comparisons of groups were analyzed using Kruskal-Wallis ANOVA test. Pair-wise comparison of groups was done by Mann-Whitney U test. Values of P < 0.05 were considered statistically significant.

   Results Top

All participants were followed up for a period of 9 months. Postoperative healing of all the control and test sites were uneventful. Participant's age, gender, defect characteristics, and location are presented in [Table 1].

Clinical parameters

A statistically significant reduction in the PI, GI [Table 2], and PD [Table 3] were observed in all three groups at 9 months postoperatively (P < 0.05). A mean reduction in PD was higher in group A and B compared to group C, however, the results were not statistically significant [Table 4]. All three groups revealed a significant gain (P < 0.05) in RAL [Table 3]. Intergroup comparison showed a significant gain in RAL in PRF + DBM and PRF group compared to the control group [Table 4]. A significant reduction in mean GR was also observed in PRF + DBM and PRF group compared to the control [Table 4].

Radiographic parameters

All groups showed a significant reduction in DD at 9 months postoperatively (P < 0.05) [Table 3]. Inter-group analysis revealed a statistically significant (P < 0.05) mean DD reduction in group A compared to group B and C [Table 4]. The LBG and %BF were significantly higher in the group A compared to that in the group B and C [Table 5]. The postoperative IOPA radiograph at 9 months represents the changes in radiographic parameters [Figure 3].

   Discussion Top

PRF attracts the attention of researchers and clinicians owing to its dense fibrin matrix, which results in slower and sustained release of growth factors from platelets and leukocytes. [16],[17] The presence of leukocytes in platelet concentrates provide an antibacterial effect in the wound; [18] moreover, PRF acts as a source of vascular endothelial growth factor (VEGF), which is essential for angiogenesis. [19] Previous studies proved that PRF can be used as a sole regenerative material along with OFD, [6],[20],[21],[22] however, a recent systematic review showed lack of evidence regarding the effect of PRF in combination with grafting materials. [23] In vivo and in vitro studies with DBM showed effective healing, radiographic bone fill, and improvement in clinical parameters. [24],[25]

In the present study PD, RAL, and GR were considered to be clinical outcome measures and LBG and %BF as radiographic outcome measures. Improved PD reduction was observed in PRF treated sites (groups A and B) compared to group C. An impressive RAL gain (3.92 ± 0.90), LBG (3.47 ± 0.53) and %BF (61.53 ± 4.54) were observed in PRF + DBM group compared to PRF and control groups. Sites treated with PRF (group A and B) showed less GR compared to control group.

The better PD reduction observed in PRF treated sites (groups A and B) may be related to the elevated concentrations of polypeptide growth factors, which might have enhanced soft tissue healing. The present finding is in accordance with the previous studies by Choukroun et al. [4] and Dohan et al. [5] The significant improvement in RAL, LBG, and %BF in this trial can be attributed to the use of DBM, which maintains the space for tissue formation to occur and osteoconductive property of the graft may act as scaffold for the growth of mineralized tissue. [25] One more positive effect of DBM is the presence of bone morphogenetic protein (BMP), which are released during the demineralization process. [26] It is speculated that BMPs in their active state (osteoinductive) promote the effects of growth factors within the platelets, which provide a synergetic effect on the different cell populations of the surgical wound. [27],[28] The results of the present trial are in accordance with previous study by Lekovic et al. [29] which showed a defect fill of 4.06 ± 0.87mm on buccal and 3.94 ± 0.73 on lingual sites in PRF + BPBM (Bovine porous bone mineral) compared to PRF group (2.21 ± 0.68 mm on buccal and 2.06 ± 0.64 mm on lingual sites). Agarwal et al. [30] reported that PRF + DFDBA (demineralized freeze-dried bone allograft) showed a mean bone fill of 3.50 ± 0.67 mm compared to DFDBA (2.49 ± 0.64 mm). Clinical attachment level (CAL) gain is considered one of the most important parameter reflecting the soft tissue healing, and LBG and %BF were considered as parameters for bone formation. The results of this study clearly show a significant improvement in CAL gain in sites treated with PRF [Table 4]. Similarly, addition of DBM significantly enhanced the bone formation at 9 months. This supports the significance of growth factors in PRF that may improve the soft and hard tissue healing. [6]

GR observed at 3 months was maintained for a period of 9 months in PRF treated sites. This finding may be explained by additional biological properties of PRF. The 3D fibrin matrix in PRF has mechanical adhesive properties and acts like fibrin glue: which hold and maintain the flap in a stable position. Agarwal et al. [31] reported a complete root coverage (100%) in 33.3% sites treated with coronally advanced flap with PRF using microsurgical approach. The improvement in PD, RAL, LBG, and %BF observed in PRF treated sites of present investigation are along the expected lines and in accordance with a recent systematic review. [23] Hence, the results of this trial add to the current evidence regarding the use of PRF with grafting material. The main limitations of our study are less sample size and inability to perform histological analysis due to ethical reason.

   Conclusion Top

Within the limits of this study, it is concluded that treatment of intrabony defect with PRF appears to be associated with improvement in clinical and radiological parameters with uneventful healing. Addition of DBM enhances the clinical effects of PRF, with particular benefits, in terms of %BF in intrabony defects. Considering the autologous nature, minimal cost and time, PRF can be incorporated as a regenerative material in intrabony defects. Further, long-term multicenter randomized, clinical trials with large sample size and histological evaluation of new bone formation are needed to confirm the results of this study.

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Conflicts of interest

There are no conflicts of interest.

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  [Figure 1], [Figure 2], [Figure 3]

  [Table 1], [Table 2], [Table 3], [Table 4], [Table 5]

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