Etiological factors in second mandibular molar impaction
Objectives: The impaction of the second mandibular molar (MM2) has recently become more prevalent. Several etiological hypothesis have been proposed to investigate the association between skeletal features and impaction of MM2. The aims of this study were to analyze the skeletal features in patients...
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Medicina Oral S.L.
2014
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| Online Access: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4002345/ |
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pubmed-40023452014-04-30 Etiological factors in second mandibular molar impaction Cassetta, Michele Altieri, Federica Calasso, Sabrina Research Objectives: The impaction of the second mandibular molar (MM2) has recently become more prevalent. Several etiological hypothesis have been proposed to investigate the association between skeletal features and impaction of MM2. The aims of this study were to analyze the skeletal features in patients with MM2 impaction and the association between arrested eruption of MM2 and the presence of the third mandibular molar (MM3). Study Design: In this retrospective study 48 subjects from 3,530 Caucasian orthodontic patients with MM2 impaction were included in a study group (SG) and compared to a control group (CG) of 200 subjects without MM2 impaction. Panoramic radiographs evaluated the presence or absence of the MM3 germ. Cephalometric analysis was performed to evaluate linear and angular skeletal values. For the statistical analysis, descriptive statistics, Student’s t-test, χ2 test and odds ratio (OR) were used. Results: The paired comparisons between SG and CG showed in cephalometric analysis both a reduced mandibular gonial angle (ArGoMe) and lowered Jarabak’s polygon value with a statistically significant difference (P≤ 0.05). MM3 was statistically significant associated (P≤ 0.05) with MM2 impaction but it is not a risk factor (OR 0.817). Conclusions: Subjects with MM2 impaction show a vertical condylar growth direction. MM3 is not a risk factor for MM2 impaction. Medicina Oral S.L. 2014-04-01 /pmc/articles/PMC4002345/ /pubmed/24790715 http://dx.doi.org/10.4317/jced.51382 Text en Copyright: © 2014 Medicina Oral S.L. http://creativecommons.org/licenses/by/2.5/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
| repository_type |
Open Access Journal |
| institution_category |
Foreign Institution |
| institution |
US National Center for Biotechnology Information |
| building |
NCBI PubMed |
| collection |
Online Access |
| language |
English |
| format |
Online |
| author |
Cassetta, Michele Altieri, Federica Calasso, Sabrina |
| spellingShingle |
Cassetta, Michele Altieri, Federica Calasso, Sabrina Etiological factors in second mandibular molar impaction |
| author_facet |
Cassetta, Michele Altieri, Federica Calasso, Sabrina |
| author_sort |
Cassetta, Michele |
| title |
Etiological factors in second mandibular molar impaction |
| title_short |
Etiological factors in second mandibular molar impaction |
| title_full |
Etiological factors in second mandibular molar impaction |
| title_fullStr |
Etiological factors in second mandibular molar impaction |
| title_full_unstemmed |
Etiological factors in second mandibular molar impaction |
| title_sort |
etiological factors in second mandibular molar impaction |
| description |
Objectives: The impaction of the second mandibular molar (MM2) has recently become more prevalent. Several etiological hypothesis have been proposed to investigate the association between skeletal features and impaction of MM2. The aims of this study were to analyze the skeletal features in patients with MM2 impaction and the association between arrested eruption of MM2 and the presence of the third mandibular molar (MM3).
Study Design: In this retrospective study 48 subjects from 3,530 Caucasian orthodontic patients with MM2 impaction were included in a study group (SG) and compared to a control group (CG) of 200 subjects without MM2 impaction. Panoramic radiographs evaluated the presence or absence of the MM3 germ. Cephalometric analysis was performed to evaluate linear and angular skeletal values. For the statistical analysis, descriptive statistics, Student’s t-test, χ2 test and odds ratio (OR) were used.
Results: The paired comparisons between SG and CG showed in cephalometric analysis both a reduced mandibular gonial angle (ArGoMe) and lowered Jarabak’s polygon value with a statistically significant difference (P≤ 0.05). MM3 was statistically significant associated (P≤ 0.05) with MM2 impaction but it is not a risk factor (OR 0.817).
Conclusions: Subjects with MM2 impaction show a vertical condylar growth direction. MM3 is not a risk factor for MM2 impaction.
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| publisher |
Medicina Oral S.L. |
| publishDate |
2014 |
| url |
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4002345/ |
| _version_ |
1612083133055762432 |