Are Noffel's danger signs pathognomonic of class II division 2? A retrospective comparative study

Fourneron, Manon; Boutin, François

doi:10.1016/j.ortho.2019.03.010

Cited by 3 publications

(1 citation statement)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While the morphological development of the tooth crown is predominantly under genetic control, but the root form appears to be influenced by local environmental factors. 29 The skeletal and the tooth size characteristic appearance in Class II division 2 malocclusion cases is uniquely influenced by genetic component as suggested by Peck et al and Fourneron et al 30,31 Some pathognomonic features of Class II division 2 malocclusion as described by Prasad et al were similar to those observed by Peck et al 32 Some dental anomalies are associated with Class II division 2 malocclusion but it is not common in all types of Class II Division 2 malocclusion as reported by Pereira et al and Basdra et al 33,34 Any alteration in the function during root formation may cause variations in the axis of crown and root because of different sequence of crown and root development. 35 A normal collum angle which is most often seen in the central incisors of Class I and Class II division 1 could be because of physiological pressure from the tongue on the lingual side and lips on the labial side which results in the proper eruptive guidance as reported by Harris et al 17 For torque expression collum angle is critically important when using a straight wire appliance.…”

Section: Discussionmentioning

confidence: 95%

Evaluation of collum angle of maxillary incisors on impacted vs non impacted canine Side: A CBCT analysis

Nazir,

Mushtaq

2023

JCO

View full text Add to dashboard Cite

The angle which is formed between the crown axis and root axis of an upper central incisor is called collum angle and this angle serves as an important morphological feature for normal development of the dentition and plays a vital role during diagnosis and treatment planning and may vary in different malocclusions i.e; skeletal and dental malocclusions. To quantify and compare the collum angle (crown root angulation) of maxillary incisors (central and lateral incisor) in subjects with unilateral permanent maxillary canine impaction between the impacted and non impacted side using Cone Beam Computed Tomography (CBCT). Thirty subjects with unilateral permanent maxillary canine impaction who had to undergo fixed orthodontic treatment were selected and their CBCT images were analysed. The collum angle of maxillary central and lateral incisor on impaction and non impaction side was measured using CBCT imaging. Descriptive statistical analysis was carried out and the mean±standard deviation was calculated and comparison between two sides was made by using paired t-test and a p value of less <0.05 was considered as statistically significant. The collum angle of central and lateral incisor between impacted and non impacted side were averaged. Thus, the mean±standard deviation and standard error of the collum angle (n-30) were calculated for maxillary central incisor and lateral incisor on both sides. The mean±sd of the collum angle of maxillary central incisor on impacted and non impacted side was 1.39±7.16 and 2.33±5.86 respectively with a p value of 0.282, while as the mean±sd of the collum angle of maxillary lateral incisor on impacted and non impacted side was 3.09±6.26 and 5.24±5.28 respectively with a p value of 0.060 which was considered as statistically insignificant between the two sides. A decrease in collum angle was found on impaction side with a more decreased value for lateral incisor when comparison was made with non impaction side, but no statistically significant difference was found.

show abstract