{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,27]],"date-time":"2026-02-27T04:05:58Z","timestamp":1772165158329,"version":"3.50.1"},"reference-count":104,"publisher":"SAGE Publications","issue":"1","license":[{"start":{"date-parts":[[2019,11,13]],"date-time":"2019-11-13T00:00:00Z","timestamp":1573603200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["J Orthod"],"published-print":{"date-parts":[[2020,3]]},"abstract":"<jats:sec>\n                    <jats:title>Introduction:<\/jats:title>\n                    <jats:p>The purpose of this study was to seek and summarise the Bolton overall index (OI) and anterior index (AI) regarding normal occlusion and Angle\u2019s malocclusion according to gender, and to assess if these indices support Bolton\u2019s standards as general references.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods:<\/jats:title>\n                    <jats:p>PubMed, LILACS, Embase, CENTRAL and Google Scholar databases were searched up to June 2019 (CRD42018088438). Non-randomised clinical studies, published in English and assessing Bolton\u2019s OI and\/or AI in normal occlusion and Angle\u2019s malocclusion groups, were included. OI and AI means, sample size and SDs were collected. The National Heart, Lung, and Blood Institute\u2019s Quality Assessment Tool for Observational Cohort and Cross-Sectional Studies was used to assess the risk of bias. Pairwise random-effects and multilevel Bayesian network meta-analyses were used to synthesise available data.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>\n                      Fifty-three observational studies were included (11,411 participants; 3746 men, 4430 women; 15 studies lacked gender information). For normal occlusion, pooled estimates for OI and AI means were 91.78% (95% confidence interval [CI] = 91.42\u201392.14; I\n                      <jats:sup>2<\/jats:sup>\n                      = 92.87%) and 78.25% (95% CI = 77.87\u201378.62; I\n                      <jats:sup>2<\/jats:sup>\n                      = 90.67%), respectively. We could identify in Angle\u2019s Class III patients meaningful OI and AI mean deviations from normal occlusion (0.76, 95% credible interval [CrI] = 0.55\u20130.98 and 0.61, 95% CrI = 0.35\u20130.87, respectively), while in Class II patients we found a meaningful mean deviation from normal occlusion only for OI (\u22120.28, 95% CrI = \u22120.52\u2013\u22120.05). Concerning gender impact, male patients presented higher OI (0.30, 95% CI = 0.00\u20130.59) and AI (0.41, 95% CI = 0.00\u20130.83) mean values than female patients in Class I.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion:<\/jats:title>\n                    <jats:p>Normal occlusion OI and AI mean values differ from Bolton\u2019s original values. Class II division 2, for OI mean values, and Class III, for both OI and AI, are proportionally larger than normal occlusion patients. Gender had almost no impact on teeth mesiodistal proportion.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/1465312519886322","type":"journal-article","created":{"date-parts":[[2019,11,13]],"date-time":"2019-11-13T10:42:21Z","timestamp":1573641741000},"page":"7-29","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":19,"title":["A systematic review and meta-analysis on Bolton\u2019s ratios: Normal occlusion and malocclusion"],"prefix":"10.1177","volume":"47","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2503-260X","authenticated-orcid":false,"given":"Vanessa","family":"Machado","sequence":"first","affiliation":[{"name":"Clinical Research Unit (CRU), Centro de Investiga\u00e7\u00e3o Interdisciplinar Egas Moniz (CiiEM), Egas Moniz - Cooperativa de Ensino Superior, C.R.L., Monte de Caparica, Almada, Portugal"},{"name":"Orthodontics Department, Clinical Research Unit (CRU), Centro de Investiga\u00e7\u00e3o Interdisciplinar Egas Moniz (CiiEM), Egas Moniz - Cooperativa de Ensino Superior, C.R.L., Monte de Caparica, Almada, Portugal"}]},{"given":"Jo\u00e3o","family":"Botelho","sequence":"additional","affiliation":[{"name":"Clinical Research Unit (CRU), Centro de Investiga\u00e7\u00e3o Interdisciplinar Egas Moniz (CiiEM), Egas Moniz - Cooperativa de Ensino Superior, C.R.L., Monte de Caparica, Almada, Portugal"}]},{"given":"Paulo","family":"Mascarenhas","sequence":"additional","affiliation":[{"name":"Clinical Research Unit (CRU), Centro de Investiga\u00e7\u00e3o Interdisciplinar Egas Moniz (CiiEM), Egas Moniz - Cooperativa de Ensino Superior, C.R.L., Monte de Caparica, Almada, Portugal"}]},{"given":"Jos\u00e9 Jo\u00e3o","family":"Mendes","sequence":"additional","affiliation":[{"name":"Clinical Research Unit (CRU), Centro de Investiga\u00e7\u00e3o Interdisciplinar Egas Moniz (CiiEM), Egas Moniz - Cooperativa de Ensino Superior, C.R.L., Monte de Caparica, Almada, Portugal"}]},{"given":"Ana","family":"Delgado","sequence":"additional","affiliation":[{"name":"Clinical Research Unit (CRU), Centro de Investiga\u00e7\u00e3o Interdisciplinar Egas Moniz (CiiEM), Egas Moniz - Cooperativa de Ensino Superior, C.R.L., Monte de Caparica, Almada, Portugal"},{"name":"Orthodontics Department, Clinical Research Unit (CRU), Centro de Investiga\u00e7\u00e3o Interdisciplinar Egas Moniz (CiiEM), Egas Moniz - Cooperativa de Ensino Superior, C.R.L., Monte de Caparica, Almada, Portugal"}]}],"member":"179","published-online":{"date-parts":[[2019,11,13]]},"reference":[{"key":"bibr1-1465312519886322","doi-asserted-by":"publisher","DOI":"10.12816\/0033232"},{"key":"bibr2-1465312519886322","first-page":"459","volume":"76","author":"Al-Khateeb S","year":"2006","journal-title":"Angle Orthodontist"},{"key":"bibr3-1465312519886322","doi-asserted-by":"publisher","DOI":"10.1093\/ejo\/cjn030"},{"key":"bibr4-1465312519886322","first-page":"1119","volume":"52","author":"Al 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