184.full - European Journal of Orthodontics 31(2009 184188 doi:10.1093\/ejo\/cjn094 Advance Access publication 6 January 2009 The Author 2009 Published by

184.full - European Journal of Orthodontics 31(2009 184188...

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European Journal of Orthodontics 31 (2009) 184–188 © The Author 2009. Published by Oxford University Press on behalf of the European Orthodontic Society. doi:10.1093/ejo/cjn094 All rights reserved. For permissions, please email: [email protected] Advance Access publication 6 January 2009 Introduction In United Kingdom (UK), Norway, The Netherlands, and Sweden, treatment priority indices are commonly used to determine the level of public health payment the patient may be entitled to or to select which patients will be treated free of charge (Shaw et al. , 1995). Deviations from what is considered the ideal occlusion are common; approximately 75 per cent of the population has some type of malocclusion, but not all of them require treatment (Helm, 1970; Prof fi t, 1993). Many indices have been developed to divide malocclusions into different groups according to severity and need for treatment, so that individuals with the greatest need for treatment may then be given priority if resources are limited (Brook and Shaw, 1989). The Index of Orthodontic Treatment Need (IOTN), developed in the UK (Evans and Shaw, 1987; Brook and Shaw, 1989) consists of two parts: estimation of aesthetics [Aesthetic Component, (AC)] and estimation of the severity of the malocclusion [Dental Health Component, (DHC)]. The DHC was developed to reduce the subjectivity in measurement, by using well-de fi ned cut-off points (Figure 1). The malocclusions are divided into fi ve different groups ranging from very great need to no treatment need, to try to establish meaningful values for cut-off points between grades for each occlusal trait that represents a Evaluation of the Dental Health Component, of the Index of Orthodontic Treatment Need, by Swedish orthodontists Anneli M. Johansson and Marie E. Follin Orthodontic Department, Institute of Odontology, the Sahlgrenska Academy at Göteborg University, Sweden SUMMARY The aim of the present study was to evaluate if orthodontists in Sweden agree with the grading in the Dental Health Component (DHC) of the Index of Orthodontic Treatment Need, to analyze if certain malocclusions are graded differently, and to determine if there are any background factors among Swedish orthodontists that could be related to their judgements. Two questionnaires were sent to 272 orthodontists in Sweden. In one questionnaire, they were asked to grade different malocclusions (defined in the DHC) according to the need for orthodontic treatment and in the other to provide details of their background. Eighty-one per cent (219) answered one or both questionnaires and 216 answered the questions concerning the need for orthodontic treatment. The Swedish orthodontists’ judgements were then compared with the gradings in the DHC. Statistical analysis was undertaken using chi-square, likelihood ratio chi-square, phi coefficient, contingency coefficient, and Cramer’s V tests.

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