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      Long-term survival of retained deciduous mandibular second molars and maxillary canine incorporated into final occlusion

      case-report

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          Abstract

          Orthodontic treatment of a complex case that involves retained deciduous mandibular second molars with missing permanent successors is challenging. Usually, congenitally missing teeth are manifested with other dental anomalies that further complicate orthodontic treatment, such as retained deciduous teeth, impactions, transpositions and peg-shaped lateral incisors. Even though the long term prognosis of the retained deciduous tooth is not fully predictable, if the teeth are in good condition, the patient and clinician may incline towards a decision to preserve the deciduous teeth as long as possible. This case report demonstrates that deciduous teeth, in this case the mandibular second molars and maxillary canine, can be incorporated into final occlusion with clinically stable long-term results.

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          Most cited references25

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          A meta-analysis of the prevalence of dental agenesis of permanent teeth.

          To gain more insight into the prevalence of dental agenesis. Data from Caucasian populations in North America, Australia and Europe were included in a meta-analysis. For the prevalence of African American, Chinese and Arab groups only indications could be reported because of a limited number of studies. Agenesis differs by continent and gender: the prevalence for both sexes was higher in Europe (males 4.6%; females 6.3%) and Australia (males 5.5%; females 7.6%) than for North American Caucasians (males 3.2%; females 4.6%). In addition, the prevalence of dental agenesis in females was 1.37 times higher than in males. The mandibular second premolar was the most affected tooth, followed by the maxillary lateral incisor and the maxillary second premolar. The occurrence of dental agenesis was divided into three main groups: common (P2(i) > I2(s) > P2(s)), less common (I1(i) > I2(i) & P1(s) > C(s) & M2(i)) and rare (M2(s) & M1(s) > C(i) > M1(i) & I1(s)). Unilateral occurrence of dental agenesis is more common than bilateral occurrence. However, bilateral agenesis of maxillary lateral incisors is more common than unilateral agenesis. The overall prevalence of agenesis in the maxilla is comparable with that in the mandible, but a marked difference was found between both jaws regarding tooth type. Absence of one or two permanent teeth is found in 83% of the subjects with dental agenesis. A practical application of the results of the meta-analysis is the estimation of dental treatment need. Copyright Blackwell Munksgaard, 2004
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            Radiographic evaluation of skeletal maturation. A clinically oriented method based on hand-wrist films.

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              A controlled study of associated dental anomalies.

              T Baccetti (1998)
              The purpose of this study was to reveal patterns of association among seven types of dental anomalies (aplasia of second premolars, small size of maxillary lateral incisors, infraocclusion of primary molars, enamel hypoplasia, ectopic eruption of first molars, supernumerary teeth, and palatal displacement of maxillary canines) in an untreated orthodontic population, ages 7 to 14. The prevalence of associated tooth anomalies in seven groups of 100 subjects selected according to one primarily diagnosed dental anomaly was compared with the prevalence of the examined dental anomalies in a control group of 1,000 subjects. Significant reciprocal associations (p < 0.005) were found among five of the anomalies (aplasia of second premolars, small size of maxillary lateral incisors, infraocclusion of primary molars, enamel hypoplasia, and palatal displacement of maxillary canines), suggesting a common genetic origin for these conditions. Supernumerary teeth appeared to be a separate etiological entity with respect to all other examined tooth anomalies. The existence of associations between different tooth anomalies is clinically relevant, as the early diagnosis of one anomaly may indicate an increased risk for others.
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                Author and article information

                Journal
                Korean J Orthod
                Korean J Orthod
                KJOD
                Korean Journal of Orthodontics
                Korean Association of Orthodontists
                2234-7518
                2005-372X
                September 2017
                27 July 2017
                : 47
                : 5
                : 323-333
                Affiliations
                [a ]Department of Orthodontics, Gangnam Severance Dental Hospital, Institute of Craniofacial Deformity, College of Dentistry, Yonsei University, Seoul, Korea.
                [b ]Department of Orthodontics, Institute of Craniofacial Deformity, College of Dentistry, Yonsei University, Seoul, Korea.
                Author notes
                Corresponding author: Kyung-Ho Kim. Professor, Department of Orthodontics, Gangnam Severance Dental Hospital, Yonsei University, 211 Eonju-ro, Gangnam-gu, Seoul 06273, Korea. Tel +82-2-2019-3562, khkim@ 123456yuhs.ac
                Article
                10.4041/kjod.2017.47.5.323
                5548713
                45b6a185-856f-4ae4-982b-dceea792fc69
                © 2017 The Korean Association of Orthodontists.

                This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 16 February 2017
                : 27 March 2017
                Categories
                Case Report

                Dentistry
                agenesis,transposition,tooth impaction,stability
                Dentistry
                agenesis, transposition, tooth impaction, stability

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