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International Journal of Morphology

On-line version ISSN 0717-9502


GARCIA-HERNANDEZ, Fernando; TORO YAGUI, Oscar; VEGA VIDAL, Manuel  and  VERDEJO MENESES, Mauricio. Eruption and Retention of Third Molars in Young People between 17 and 20 Years of Age, Antofagasta, Chile. Int. J. Morphol. [online]. 2009, vol.27, n.3, pp.727-736. ISSN 0717-9502.

Intraoseous retention and anomalous eruption position of 3Ms had been widely studied. They are probably produced by reducing the size of jaws by changes in eating habits, reducing the retro molar space, making it difficult normal eruption between 15 and 25 years old, producing pathologies or discomfort by compromising nearly orofacial structures. The above, has promoted the extraction or prophylactic orthodontic, even from the dental germ, with expensives clinical cost, hospital surgery, compromising part of the resources to finance other surgical oral procedures, in addition to risks during surgery, postoperative and iatrogenic injuries temporary or permanent. The sample consisted in 100 young people aged 17 to 20 years of age (50 women and 50 men) of the city of Antofagasta, healthy, without general and maxillofacial malformation, without having submitted infectious diseases that distort odontogenesis and periods of eruption, without extractions of 3M nor orthodontic treatments prior to the examination of the x-ray overview and classifying eruption of 3Ms as tables of Pell-Gregory and Winter. It was determined that 49.1 % of 3Ms were retained, with p<0.05 significant with regard to erupted teeth, predominate maxillary retention, especially in women. In all cases and in maxilla predominate 3Ms with mesiangular position (p<0.05 of significance) and in maxillary vertical retention (p<0.05 of significance). Prevailing 3Ms maxilla with distoangular position, a position that predisposes surgical complications and postoperative extractions. The horizontal retention is apparent only in mandible, being the second type of retention (21.5% in all cases and 30% in men). Without a clinic decision to indicate surgery, we suggest to postpone the prophylactic extraction of 3Ms, awaiting possible late eruption (Hattab, 1997; Ventä et al., 1999, 2004; Kruger et al., 2001). Meta-analyzes show minimum morbidity in 3Ms extractions in patients aged 25 or older, with low incidence of complications and minimum impact on quality of life (Haug et al., 2005).

Keywords : Third molar; Retention; Pell-Gregory classification; Winter classification; Dentistry.

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