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  1. Mulimani P, Abas AB, Karanth L, Colombatti R, Kulkarni P
    Cochrane Database Syst Rev, 2023 Feb 02;2(2):CD012969.
    PMID: 36732291 DOI: 10.1002/14651858.CD012969.pub3
    BACKGROUND: Thalassaemia is a quantitative abnormality of haemoglobin caused by mutations in genes controlling production of alpha or beta globins. Abnormally unpaired globin chains cause membrane damage and cell death within organ systems and destruction of erythroid precursors in the bone marrow, leading to haemolytic anaemia. The life-long management of the general health effects of thalassaemia is highly challenging, and failure to deal with dental and orthodontic complications exacerbates the public health, financial and personal burden of the condition. There is a lack of evidence-based guidelines to help care seekers and providers manage such dental and orthodontic complications. This review aimed to evaluate the available evidence on methods for treating dental and orthodontic complications in people with thalassaemia to inform future recommendations. This is an update of a Cochrane Review first published in 2019.

    OBJECTIVES: To assess different methods for treating dental and orthodontic complications in people with thalassaemia.

    SEARCH METHODS: We searched the Cochrane Cystic Fibrosis and Genetic Disorders Group's Haemoglobinopathies Trials Register in September 2022, and we searched nine online databases and trials registries in January 2022. We searched the reference lists of relevant articles and reviews and contacted haematologists, experts in fields of dentistry, organisations, pharmaceutical companies and researchers working in this field.

    SELECTION CRITERIA: We searched for published or unpublished randomised controlled trials (RCTs) that evaluated treatment of dental and orthodontic complications in individuals diagnosed with thalassaemia, irrespective of phenotype, severity, age, sex and ethnic origin.

    DATA COLLECTION AND ANALYSIS: Two review authors independently screened the 37,242 titles retrieved by the search. After deduplication, we identified two potentially relevant RCTs. On assessing their eligibility against our inclusion and exclusion criteria, we excluded one and included the other.

    MAIN RESULTS: We included one parallel-design RCT conducted in Saudi Arabia and involving 29 participants (19 males, 10 females) with thalassaemia. It aimed to assess the effectiveness of photodynamic therapy as an adjuvant to conventional full-mouth ultrasonic scaling for the treatment of gingivitis. The average age of participants was around 23 years. There is very low-certainty evidence from this trial that full-mouth ultrasonic scaling plus photodynamic therapy compared to full-mouth ultrasonic scaling alone may improve gingival index score and bleeding on probing after 12 weeks in people with thalassaemia. We found no studies that assessed other interventions for the various dental or orthodontic complications of thalassaemia.

    AUTHORS' CONCLUSIONS: Although the included study showed greater reduction in gingivitis in the group treated with full-mouth ultrasonic scaling plus photodynamic therapy, the evidence is of very low certainty. The study had unclear risk of bias, a short follow-up period and no data on safety or adverse effects. We cannot make definitive recommendations for clinical practice based on the limited evidence of a single trial. Future studies will very likely affect the conclusions of this review. This review highlights the need for high-quality RCTs that investigate the effectiveness of various treatment modalities for dental and orthodontic complications in people with thalassaemia. It is crucial that future trials assess adverse effects of interventions.

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