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  • 1.
    Frilund, Erik
    et al.
    Department of Orthodontics, The Institute for Postgraduate Dental Education, Jönköping, Sweden.
    Sonesson, Mikael
    Jönköping University, School of Health and Welfare, HHJ. Centre for Oral Health. Department of Orthodontics, Section 4, University of Malmö, Malmö, Sweden.
    Magnusson, Anders
    Department of Orthodontics, The Institute for Postgraduate Dental Education, Jönköping, Sweden; Department of Orthodontics, The Institute for Postgraduate Dental Education, Jönköping, Sweden.
    Patient compliance with Twin Block appliance during treatment of Class II malocclusion: a randomized controlled trial on two check-up prescriptions2023In: European Journal of Orthodontics, ISSN 0141-5387, E-ISSN 1460-2210, Vol. 45, no 2, p. 142-149Article in journal (Refereed)
    Abstract [en]

    Background

    Compliance is crucial for the treatment outcome with removable appliances. Previous studies on treatment with the Twin Block appliance have focused on effectiveness in relation to other treatment methods or wear-time. Studies on different check-up intervals to improve compliance seem to be lacking.

    Objectives

    To compare the impact of two different check-up prescriptions on patient compliance and treatment outcome during treatment with Twin Block.

    Trial Design

    Two-arm parallel group, single-centre, randomized controlled trial.

    Materials and Methods

    Seventy-three patients, 38 boys, and 35 girls, mean age 11.2 years, were included and block-randomized into two groups treated with a Twin Block appliance. Group 1 was called for check-up visit every sixth week and group 2 every fourth week. Compliance was evaluated with a TheraMon (R) microsensor, moulded into the appliance, measuring wear-time. Overjet, overbite, and molar relationships were assessed on study casts before and after treatment. The treatment outcomes were analysed on an intention-to-treat basis.

    Results

    In group 1, the reduction of overjet was 5.2 mm and the mean wear-time was 6.9 hours. In group 2, the reduction was 4.7 mm and the wear-time was 6.1 hours. Seventy-four per cent of the patients presented an overjet of 4 mm or less. Wear-time did not correlate to age, gender, or severity of malocclusion.

    Harms

    No harm was observed in any patient. Lateral open bites were registered during treatment but were normalized at the end of the treatment.

    Limitations

    The trial was a single-centre study and long-term effects were not evaluated.

    Conclusions

    During treatment with the Twin Block appliance, a 4-week check-up interval did not improve treatment outcome or increase wear-time, compared to a 6-week check-up interval. The mean wear-time was 6.5 hours per day, even if the recommendation was 12 hours.

  • 2.
    Frilund, Erik
    et al.
    Inst Postgrad Dent Educ, Dept Orthodont, Hermansvagen 5,Plan 8, S-55453 Jönköping, Sweden.;Jönköping Univ, Ctr Oral Hlth, Sch Hlth & Welf, Jönköping, Sweden..
    Sonesson, Mikael
    Malmö University, Faculty of Odontology (OD). Jönköping Univ, Ctr Oral Hlth, Sch Hlth & Welf, Jönköping, Sweden..
    Magnusson, Anders
    Inst Postgrad Dent Educ, Dept Orthodont, Hermansvagen 5,Plan 8, S-55453 Jönköping, Sweden.;Jönköping Univ, Ctr Oral Hlth, Sch Hlth & Welf, Jönköping, Sweden.;Linköping Univ, Dept Biomed & Clin Sci, Linköping, Sweden..
    Patient compliance with Twin Block appliance during treatment of Class II malocclusion: a randomized controlled trial on two check-up prescriptions2023In: European Journal of Orthodontics, ISSN 0141-5387, E-ISSN 1460-2210, Vol. 45, no 2, p. 142-149Article in journal (Refereed)
    Abstract [en]

    Background Compliance is crucial for the treatment outcome with removable appliances. Previous studies on treatment with the Twin Block appliance have focused on effectiveness in relation to other treatment methods or wear-time. Studies on different check-up intervals to improve compliance seem to be lacking. Objectives To compare the impact of two different check-up prescriptions on patient compliance and treatment outcome during treatment with Twin Block. Trial Design Two-arm parallel group, single-centre, randomized controlled trial. Materials and Methods Seventy-three patients, 38 boys, and 35 girls, mean age 11.2 years, were included and block-randomized into two groups treated with a Twin Block appliance. Group 1 was called for check-up visit every sixth week and group 2 every fourth week. Compliance was evaluated with a TheraMon (R) microsensor, moulded into the appliance, measuring wear-time. Overjet, overbite, and molar relationships were assessed on study casts before and after treatment. The treatment outcomes were analysed on an intention-to-treat basis. Results In group 1, the reduction of overjet was 5.2 mm and the mean wear-time was 6.9 hours. In group 2, the reduction was 4.7 mm and the wear-time was 6.1 hours. Seventy-four per cent of the patients presented an overjet of 4 mm or less. Wear-time did not correlate to age, gender, or severity of malocclusion. Harms No harm was observed in any patient. Lateral open bites were registered during treatment but were normalized at the end of the treatment. Limitations The trial was a single-centre study and long-term effects were not evaluated. Conclusions During treatment with the Twin Block appliance, a 4-week check-up interval did not improve treatment outcome or increase wear-time, compared to a 6-week check-up interval. The mean wear-time was 6.5 hours per day, even if the recommendation was 12 hours.

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