The relationship between crowding of teeth and gingivitis in mouthbreathers and nosebreathers was studied in a groupof 6‐ to 12‐year‐old children. The material consisted of fifty‐five children with obstructed nosebreathing due to enlarged adenoids. Forty healthy children served as controls. Gingival conditions were registered in accordance with Löe & Silness. Crowding was assessed according to Lundström. The results indicated that in mouthbreathers there was a correlation between crowding and gingivitis, manifested in regions of the dentition most likely subjected to dehydration from mouthbreathing. For nosebreathers, the statistical method used did not reveal a correlation between crowding and gingivitis.
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Jacobson et al. (1972) studied this question.
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