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Patient has a tendency to develop tongue thrust, due to creation of extraction spaces that close gradually; Extraction of posterior teeth may lead to deepening of bite; There is a risk of arch length reduction because of mesial migration of the buccal segment; Minor spaces may exist between canine and second premolar
The removal of only the maxillary first premolars is the second likeliest option, in 14.5% of cases. [10] The practice of premolar extraction developed in the 1940s in the United States, and was initially greatly contested in the orthodontic field, due to the changes to the facial structure caused by the retraction of the arches.
Permanent teeth or adult teeth are the second set of teeth formed in diphyodont mammals.In humans and old world simians, there are thirty-two permanent teeth, consisting of six maxillary and six mandibular molars, four maxillary and four mandibular premolars, two maxillary and two mandibular canines, four maxillary and four mandibular incisors.
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In the universal system of notation, the permanent maxillary lateral incisors are designated by a number. [2] The right permanent maxillary lateral incisor is known as "7", and the left one is known as "10". [2] [4] In the Palmer notation, a number is used in conjunction with a symbol designating in which quadrant the tooth is found. [2]
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Maxillary canines begin to calcify by 4 months of age. The enamel of the tooth is completely formed by around 6 to 7 years of age and the permanent maxillary canines erupt at around 11 to 12 years of age. The root is completely formed by 13 to 15 years of age. The maxillary canine teeth are slightly wider than the mandibular canine teeth.
The canine teeth are able to withstand the tremendous lateral pressures from chewing. There is a single cusp on canines, and they resemble the prehensile teeth found in carnivorous animals. Though relatively the same, there are some minor differences between the deciduous (baby) mandibular canine and that of the permanent mandibular canine.