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Revista clínica de periodoncia, implantología y rehabilitación oral

On-line version ISSN 0719-0107


BIZCAR, Betty; NAVARRO, Pablo  and  SANDOVAL, Paulo. Unerupted mandibular permanent second molars in Radiographicanalysis. Rev. Clin. Periodoncia Implantol. Rehabil. Oral [online]. 2017, vol.10, n.1, pp.44-48. ISSN 0719-0107.

No eruption of seconds is relatively low, has been increasing in recent years. It relates to long, costly and complex multidisciplinary treatment, so it is important to focus on early diagnosis and early treatment. The aim of this study is to make a comparison of radiographic measurements among a group of patients with mandibular second permanent molar eruption and no possibility of a control group.


A consecutive manual review of 16,835 sheets on which inclusion and exclusion criteria were applied. The data were obtained from panoramic radiographs of which linear and angular measurements were compared between two study groups were obtained. A predictive model was developed using discriminant analysis.


1.5% of patients had unerupted second molars. The averages of the relevant variables were: Angle of the second molar 33.7 °; distance from distal of the first molar to the anterior border of the ramus 15 mm; invasion distal of the first molar the second molar 2.1mm; second molar mesial inclination relative to the occlusal plane 128 ° and 63 ° mandibular plane. The critical discriminant score was 36.7.


Statistically significant differences between cases and controls was found in all variables. The predictive model can identify likely molars with or without natural eruption. It is necessary to have further studies with population samples to establish what would be the normal values to diagnose this condition at an early stage.

Keywords : Tooth, Impacted; Tooth, Unerupted; permanent molars.

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