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Meta-Analysis
. 2018 Nov 26;11(11):CD011423.
doi: 10.1002/14651858.CD011423.pub2.

Autologous platelet concentrates for treating periodontal infrabony defects

Affiliations
Meta-Analysis

Autologous platelet concentrates for treating periodontal infrabony defects

Massimo Del Fabbro et al. Cochrane Database Syst Rev. .

Abstract

Background: Periodontal disease is a condition affecting tooth-supporting tissues (gingiva, alveolar bone, periodontal ligament, and cementum), with the potential of introducing severe adverse effects on oral health. It has a complex pathogenesis which involves the combination of specific micro-organisms and a predisposing host response. Infrabony defects are one of the morphological types of alveolar bone defects that can be observed during periodontitis. Recent approaches for the treatment of infrabony defects, combine advanced surgical techniques with platelet-derived growth factors. These are naturally synthesized polypeptides, acting as mediators for various cellular activities during wound healing. It is believed that the adjunctive use of autologous platelet concentrates to periodontal surgical procedures produces a better and more predictable outcome for the treatment of infrabony defects.

Objectives: To assess the effects of autologous platelet concentrates (APC) used as an adjunct to periodontal surgical therapies (open flap debridement (OFD), OFD combined with bone grafting (BG), guided tissue regeneration (GTR), OFD combined with enamel matrix derivative (EMD)) for the treatment of infrabony defects.

Search methods: Cochrane Oral Health's Information Specialist searched the following databases: Cochrane Oral Health's Trials Register (to 27 February 2018); the Cochrane Central Register of Controlled Trials (CENTRAL; 2018, Issue 1) in the Cochrane Library (searched 27 February 2018); MEDLINE Ovid (1946 to 27 February 2018); Embase Ovid (1980 to 27 February 2018); and LILACS BIREME Virtual Health Library (from 1982 to 27 February 2018). The US National Institutes of Health Ongoing Trials Register (ClinicalTrials.gov) and the World Health Organization International Clinical Trials Registry Platform were searched for ongoing trials on 27 February 2018. No restrictions were placed on the language or date of publication when searching the electronic databases.

Selection criteria: We included randomised controlled trials (RCTs) of both parallel and split-mouth design, involving patients with infrabony defects requiring surgical treatment. Studies had to compare treatment outcomes of a specific surgical technique combined with APC, with the same technique when used alone.

Data collection and analysis: Two review authors independently conducted data extraction and risk of bias assessment, and analysed data following Cochrane methods. The primary outcomes assessed were: change in probing pocket depth (PD), change in clinical attachment level (CAL), and change in radiographic bone defect filling (RBF). We organised all data in four groups, each comparing a specific surgical technique when applied with the adjunct of APC or alone: 1. APC + OFD versus OFD, 2. APC + OFD + BG versus OFD + BG, 3. APC + GTR versus GTR, and 4. APC + EMD versus EMD.

Main results: We included 38 RCTs. Twenty-two had a split-mouth design, and 16 had a parallel design. The overall evaluated data included 1402 defects. Two studies were at unclear overall risk of bias, while the remaining 36 studies had a high overall risk of bias.1. APC + OFD versus OFD alone Twelve studies were included in this comparison, with a total of 510 infrabony defects. There is evidence of an advantage in using APC globally from split-mouth and parallel studies for all three primary outcomes: PD (mean difference (MD) 1.29 mm, 95% confidence interval (CI) 1.00 to 1.58 mm; P < 0.001; 12 studies; 510 defects; very low-quality evidence); CAL (MD 1.47 mm, 95% CI 1.11 to 1.82 mm; P < 0.001; 12 studies; 510 defects; very low-quality evidence); and RBF (MD 34.26%, 95% CI 30.07% to 38.46%; P < 0.001; 9 studies; 401 defects; very low-quality evidence).2. APC + OFD + BG versus OFD + BG Seventeen studies were included in this comparison, with a total of 569 infrabony defects. Considering all follow-ups, as well as 3 to 6 months and 9 to 12 months, there is evidence of an advantage in using APC from both split-mouth and parallel studies for all three primary outcomes: PD (MD 0.54 mm, 95% CI 0.33 to 0.75 mm; P < 0.001; 17 studies; 569 defects; very low-quality evidence); CAL (MD 0.72 mm, 95% CI 0.43 to 1.00 mm; P < 0.001; 17 studies; 569 defects; very low-quality evidence); and RBF (MD 8.10%, 95% CI 5.26% to 10.94%; P < 0.001; 11 studies; 420 defects; very low-quality evidence).3. APC + GTR versus GTR alone Seven studies were included in this comparison, with a total of 248 infrabony defects. Considering all follow-ups, there is probably a benefit for APC for both PD (MD 0.92 mm, 95% CI -0.02 to 1.86 mm; P = 0.05; very low-quality evidence) and CAL (MD 0.42 mm, 95% CI -0.02 to 0.86 mm; P = 0.06; very low-quality evidence). However, given the wide confidence intervals, there might be a possibility of a slight benefit for the control. When considering a 3 to 6 months and a 9 to 12 months follow-up there were no benefits evidenced, except for CAL at 3 to 6 months (MD 0.54 mm, 95% CI 0.18 to 0.89 mm; P = 0.003; 3 studies; 134 defects). No RBF data were available.4. APC + EMD versus EMDTwo studies were included in this comparison, with a total of 75 infrabony defects. There is insufficient evidence of an overall advantage of using APC for all three primary outcomes: PD (MD 0.13 mm, 95% CI -0.05 to 0.30 mm; P = 0.16; 2 studies; 75 defects; very low-quality evidence), CAL (MD 0.10 mm, 95% CI -0.13 to 0.32 mm; P = 0.40; 2 studies; 75 defects; very low-quality evidence), and RBF (MD -0.60%, 95% CI -6.21% to 5.01%; P = 0.83; 1 study; 49 defects; very low-quality evidence).All studies in all groups reported a survival rate of 100% for the treated teeth. No complete pocket closure was reported. No quantitative analysis regarding patients' quality of life was possible.

Authors' conclusions: There is very low-quality evidence that the adjunct of APC to OFD or OFD + BG when treating infrabony defects may improve probing pocket depth, clinical attachment level, and radiographic bone defect filling. For GTR or EMD, insufficient evidence of an advantage in using APC was observed.

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Conflict of interest statement

The review authors declare they have no conflicts of interest.

Figures

1
1
Study flow diagram.
2
2
Risk of bias graph: review authors' judgements about each risk of bias item presented as percentages across all included studies.
3
3
Risk of bias summary: review authors' judgements about each risk of bias item for each included study.
4
4
Forest plot of comparison: 1 APC + OFD versus OFD (9‐12 months follow‐up); outcome: 1.1 Probing depth (mm).
5
5
Forest plot of comparison: 2 APC + OFD + BG versus OFD + BG (all follow‐ups); outcome: 2.1 Probing depth (mm).
6
6
Forest plot of comparison: 5 APC + GTR versus GTR (all follow‐ups), outcome: 5.1 Probing depth (mm).
1.1
1.1. Analysis
Comparison 1 APC + OFD versus OFD (9‐12 months), Outcome 1 Probing depth (mm).
1.2
1.2. Analysis
Comparison 1 APC + OFD versus OFD (9‐12 months), Outcome 2 Clinical attachment level (mm).
1.3
1.3. Analysis
Comparison 1 APC + OFD versus OFD (9‐12 months), Outcome 3 Radiographic bone defect filling (%).
2.1
2.1. Analysis
Comparison 2 APC + OFD + BG versus OFD + BG (all follow‐ups), Outcome 1 Probing depth (mm).
2.2
2.2. Analysis
Comparison 2 APC + OFD + BG versus OFD + BG (all follow‐ups), Outcome 2 Clinical attachment level (mm).
2.3
2.3. Analysis
Comparison 2 APC + OFD + BG versus OFD + BG (all follow‐ups), Outcome 3 Radiographic bone defect filling (%).
3.1
3.1. Analysis
Comparison 3 APC + OFD + BG versus OFD + BG (3‐6 months), Outcome 1 Probing depth (mm).
3.2
3.2. Analysis
Comparison 3 APC + OFD + BG versus OFD + BG (3‐6 months), Outcome 2 Clinical attachment level (mm).
3.3
3.3. Analysis
Comparison 3 APC + OFD + BG versus OFD + BG (3‐6 months), Outcome 3 Radiographic bone defect filling (%).
4.1
4.1. Analysis
Comparison 4 APC + OFD + BG versus OFD + BG (9‐12 months), Outcome 1 Probing depth (mm).
4.2
4.2. Analysis
Comparison 4 APC + OFD + BG versus OFD + BG (9‐12 months), Outcome 2 Clinical attachment level (mm).
4.3
4.3. Analysis
Comparison 4 APC + OFD + BG versus OFD + BG (9‐12 months), Outcome 3 Radiographic bone defect filling (%).
5.1
5.1. Analysis
Comparison 5 APC + GTR versus GTR (all follow‐ups), Outcome 1 Probing depth (mm).
5.2
5.2. Analysis
Comparison 5 APC + GTR versus GTR (all follow‐ups), Outcome 2 Clinical attachment level (mm).
6.1
6.1. Analysis
Comparison 6 APC + GTR versus GTR (3‐6 months), Outcome 1 Probing depth (mm).
6.2
6.2. Analysis
Comparison 6 APC + GTR versus GTR (3‐6 months), Outcome 2 Clinical attachment level (mm).
7.1
7.1. Analysis
Comparison 7 APC + GTR versus GTR (9‐12 months), Outcome 1 Probing depth (mm).
7.2
7.2. Analysis
Comparison 7 APC + GTR versus GTR (9‐12 months), Outcome 2 Clinical attachment level (mm).
8.1
8.1. Analysis
Comparison 8 APC + EMD versus EMD (all follow‐ups), Outcome 1 Probing depth (mm).
8.2
8.2. Analysis
Comparison 8 APC + EMD versus EMD (all follow‐ups), Outcome 2 Clinical attachment level (mm).
8.3
8.3. Analysis
Comparison 8 APC + EMD versus EMD (all follow‐ups), Outcome 3 Radiographic bone defect filling (%).

Comment in

References

References to studies included in this review

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Pradeep 2015 {published data only}
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Pradeep 2016 {published data only}
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Ravi 2017 {published data only}
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Sezgin 2017 {published data only}
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References to studies excluded from this review

Agarwal 2017 {published data only}
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Lekovic 2012 {published data only}
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Menezes 2012 {published data only}
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References to other published versions of this review

Del Fabbro 2014
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