Ectopic eruption of the maxillary second molar

Predictive factors

Soonshin Hwang, Yoon Jeong Choi, Ji Yeon Lee, Chooryung Judi Chung, Kyungho Kim

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Objective: The purpose of this study was to investigate the diagnostic aspects, contributing conditions, and predictive key factors associated with ectopic eruption of maxillary second molars. Material and Methods: This retrospective study evaluated the study models, lateral cephalographs, and panoramic radiographs of 40 adult subjects (20 men, 20 women) with bilateral ectopic eruption and 40 subjects (20 men, 20 women) with normal eruption of the maxillary second molars. Studied variables were analyzed statistically by independent t-tests, univariate and multivariate logistic regression analysis, followed by receiver-operating characteristic analysis. Results: Tooth widths of bilateral lateral incisors, canines, and premolars were wider in the ectopic group, which resulted in greater arch lengths. The ANB angle and maxillary tuberosity distance (PTV-M1, PTV-M2) were smaller in the ectopic group. The long axes of the maxillary molars showed significant distal inclination in the ectopic group. The multivariate logistic regression analysis showed that three key factors-arch length, ANB angle, and PTV-M1 distance-were significantly associated with ectopic eruption of the second molars. The area under the curve (AUC) was the largest for the combination of the three key factors with an AUC greater than 0.75. PTV-M1 alone was the single factor that showed the strongest association with ectopic eruption (AUC=0.7363). Conclusions: An increase in arch length, decrease in ANB angle, and decrease in maxillary tuberosity distance to the distal aspect of the maxillary first molar (PTV-M1) were the most predictive factors associated with ectopic eruption of maxillary second molars. (Angle Orthod. 2017;87:583-589).

Original languageEnglish
Pages (from-to)583-589
Number of pages7
JournalAngle Orthodontist
Volume87
Issue number4
DOIs
Publication statusPublished - 2017 Jul 1

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Area Under Curve
Logistic Models
Regression Analysis
Bicuspid
Incisor
ROC Curve
Canidae
Tooth
Retrospective Studies

All Science Journal Classification (ASJC) codes

  • Orthodontics

Cite this

Hwang, Soonshin ; Choi, Yoon Jeong ; Lee, Ji Yeon ; Chung, Chooryung Judi ; Kim, Kyungho. / Ectopic eruption of the maxillary second molar : Predictive factors. In: Angle Orthodontist. 2017 ; Vol. 87, No. 4. pp. 583-589.
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Ectopic eruption of the maxillary second molar : Predictive factors. / Hwang, Soonshin; Choi, Yoon Jeong; Lee, Ji Yeon; Chung, Chooryung Judi; Kim, Kyungho.

In: Angle Orthodontist, Vol. 87, No. 4, 01.07.2017, p. 583-589.

Research output: Contribution to journalArticle

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T1 - Ectopic eruption of the maxillary second molar

T2 - Predictive factors

AU - Hwang, Soonshin

AU - Choi, Yoon Jeong

AU - Lee, Ji Yeon

AU - Chung, Chooryung Judi

AU - Kim, Kyungho

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N2 - Objective: The purpose of this study was to investigate the diagnostic aspects, contributing conditions, and predictive key factors associated with ectopic eruption of maxillary second molars. Material and Methods: This retrospective study evaluated the study models, lateral cephalographs, and panoramic radiographs of 40 adult subjects (20 men, 20 women) with bilateral ectopic eruption and 40 subjects (20 men, 20 women) with normal eruption of the maxillary second molars. Studied variables were analyzed statistically by independent t-tests, univariate and multivariate logistic regression analysis, followed by receiver-operating characteristic analysis. Results: Tooth widths of bilateral lateral incisors, canines, and premolars were wider in the ectopic group, which resulted in greater arch lengths. The ANB angle and maxillary tuberosity distance (PTV-M1, PTV-M2) were smaller in the ectopic group. The long axes of the maxillary molars showed significant distal inclination in the ectopic group. The multivariate logistic regression analysis showed that three key factors-arch length, ANB angle, and PTV-M1 distance-were significantly associated with ectopic eruption of the second molars. The area under the curve (AUC) was the largest for the combination of the three key factors with an AUC greater than 0.75. PTV-M1 alone was the single factor that showed the strongest association with ectopic eruption (AUC=0.7363). Conclusions: An increase in arch length, decrease in ANB angle, and decrease in maxillary tuberosity distance to the distal aspect of the maxillary first molar (PTV-M1) were the most predictive factors associated with ectopic eruption of maxillary second molars. (Angle Orthod. 2017;87:583-589).

AB - Objective: The purpose of this study was to investigate the diagnostic aspects, contributing conditions, and predictive key factors associated with ectopic eruption of maxillary second molars. Material and Methods: This retrospective study evaluated the study models, lateral cephalographs, and panoramic radiographs of 40 adult subjects (20 men, 20 women) with bilateral ectopic eruption and 40 subjects (20 men, 20 women) with normal eruption of the maxillary second molars. Studied variables were analyzed statistically by independent t-tests, univariate and multivariate logistic regression analysis, followed by receiver-operating characteristic analysis. Results: Tooth widths of bilateral lateral incisors, canines, and premolars were wider in the ectopic group, which resulted in greater arch lengths. The ANB angle and maxillary tuberosity distance (PTV-M1, PTV-M2) were smaller in the ectopic group. The long axes of the maxillary molars showed significant distal inclination in the ectopic group. The multivariate logistic regression analysis showed that three key factors-arch length, ANB angle, and PTV-M1 distance-were significantly associated with ectopic eruption of the second molars. The area under the curve (AUC) was the largest for the combination of the three key factors with an AUC greater than 0.75. PTV-M1 alone was the single factor that showed the strongest association with ectopic eruption (AUC=0.7363). Conclusions: An increase in arch length, decrease in ANB angle, and decrease in maxillary tuberosity distance to the distal aspect of the maxillary first molar (PTV-M1) were the most predictive factors associated with ectopic eruption of maxillary second molars. (Angle Orthod. 2017;87:583-589).

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DO - 10.2319/020917-95

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