Incremental versus maximum bite advancement during twin-block therapy: A randomized controlled clinical trial

Phil Banks, Jean Wright, Kevin O'Brien

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    Abstract

    The aim of this study was to evaluate the effectiveness of incremental and maximum bite advancement during treatment of Class II Division 1 malocclusion with the Twin-block appliance in the permanent dentition. It was performed at 3 district general hospitals in the United Kingdom with 4 operators. Two hundred three patients, 10-14 years old, were randomized. Control patients had the initial bite taken edge-to-edge for appliance construction with a standard Twin-block. Experimental patients had 2 mm initial bite advancement and subsequent 2 mm advancements at 6 weekly intervals with a Twin-block appliance incorporating advancement screws. Data were collected at the start and the finish of Twin-block treatment. The use of incremental advancement of the Twin-block did not confer any advantages in terms of process and outcome of the treatment. However, patient compliance was influenced by operator and patient age. The duration of treatment was influenced by operator and initial overjet. Incremental bite advancement produced no advantages over maximum advancement.
    Original languageEnglish
    Pages (from-to)583-588
    Number of pages5
    JournalAmerican Journal of Orthodontics and Dentofacial Orthopedics
    Volume126
    Issue number5
    DOIs
    Publication statusPublished - Nov 2004

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