Role of Probiotics in Oral Health Maintenance Among Patients Undergoing Fixed Orthodontic Therapy: a Systematic Review o

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Role of Probiotics in Oral Health Maintenance Among Patients Undergoing Fixed Orthodontic Therapy: a Systematic Review of Randomized Controlled Clinical Trials Francesca Katherine Pietri 1

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P. Emile Rossouw 1

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Fawad Javed 1

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Dimitrios Michelogiannakis 1

# Springer Science+Business Media, LLC, part of Springer Nature 2020

Abstract The aim was to assess the role of probiotics in oral health maintenance among patients undergoing fixed orthodontic therapy (OT). An unrestricted search of indexed databases was performed until April 2020 using the following Mesh-terms: (1) probiotic and (2) orthodontic. Randomized controlled clinical trials (RCTs) evaluating the influence of probiotic therapy (PT) towards oral health maintenance/improvement in patients undergoing fixed OT were included. Data screening, selection, and extraction were performed; and the risk of bias was assessed using the Cochrane Collaboration’s tool. All evaluations were performed by 2 independent researchers; and disagreements were resolved via discussion. Nine RCTs were included. Eight studies reported that PT improves oral health in patients undergoing fixed OT. Seven studies showed that PT reduces the counts of oral pathogenic bacteria in the oral biofilm and/or saliva. One study reported that PT reduces halitosis in patients undergoing fixed OT. One study found that PT reduces the scores of plaque index (PI) and gingival index (GI); and one study reported that PT has no significant influence on PI and GI in patients undergoing fixed OT. One study reported that PT does not prevent the formation of white spot lesions during fixed OT. Three and 6 studies had a moderate and low risk of bias, respectively. A power analysis was performed in 4 studies. In conclusion, probiotics exhibit antimicrobial activity against oral pathogenic bacteria; however, due to the limitations of the studies assessed, further well-designed RCTs are needed. Keywords Probiotics . Fixed orthodontic treatment/therapy . Bacteria . Oral health maintenance/improvement . Inflammation

Introduction Orthodontic therapy (OT) is performed for the correction of dental malocclusion and craniofacial skeletal discrepancies. In order to induce tooth movement, appliances such as brackets, orthodontic bands, and wires are fixed to tooth surfaces for prolonged duration. It is however, pertinent to mention that fixed orthodontic appliances may facilitate plaque accumulation on teeth and appliance surfaces [1–3]. Patients undergoing fixed OT are often concerned about their oral hygiene status as it is often challenging to maintain routine oral hygiene during the therapeutic phase [1, 2, 4, 5]. The dental plaque (oral biofilm) harbors microbes including bacteria and fungi, which may turn into pathogens under opportunistic * Dimitrios Michelogiannakis [email protected] 1

Division of Orthodontics and Dentofacial Orthopedics Eastman Institute for Oral Health, University of Rochester, 625 Elmwood Ave, Rochester, NY 14620, USA

conditions such as poor oral hygiene m