Objectives: To determine the amount of variation in overjet and overbite that may result from changes in upper and lower incisor angulations following upper first premolar extraction treatment in Class II malocclusions. Materials and Methods: Typodonts were set up to simulate a skeletal Class II occlusion treated with upper first premolar extractions. The upper incisor angulation was altered through a range from 100° to 120° to the palatal plane by 2° increments. The overjet and overbite were measured with every 2° of upper incisor angulation change. A regression analysis was performed on the experimental data, and the regression coefficients, slope, and intercept were estimated. Results: Excessive proclination of the lower incisors will result in an abnormal overjet and overbite relationship for any magnitude of upper incisor angulation. A normal lower incisor angulation facilitates the attainment of an optimal occlusion. Excessive palatal root torque of the upper incisors will result in an incr...

Effect of Incisor Angulation on Overjet and Overbite in Class II Camouflage Treatment. A typodont study.

The Collum angle of the maxillary central incisors in patients with different types of malocclusion

https://link.springer.com/content/pdf/10.1186/s40510-019-0272-2.pdf

The crown-root morphology of central incisors in different skeletal malocclusions assessed with cone-beam computed tomography

Variability in tooth morphology is an important consideration in the attainment of an aesthetic, functional and optimal occlusion of teeth. Crown to root angulation of maxillary central incisors may limit the degree to which the roots of these teeth can be torqued lingually when related to the maxillary lingual cortical plate of bone. The angulation of the root to the crown, particularly of the single rooted anterior teeth is known as Collum angle. It is the angle formed by the intersection of the long axis of the crown and root and it is measured using the lateral cephalogram. Gingival recession due to improper movement of tooth during orthodontic treatment may lead to cosmetic defects. The extent of recession is related to the bending angle. Therefore, understanding the crown-root angle in patients with different types of malocclusion is a critical issue. The present study was done to assess the collum angle in Urban population of Karnataka.

https://www.oraljournal.com/pdf/2016/vol2issue3/PartA/2-2-37.pdf

The collum angle of Maxillary Central Incisors in different skeletal malocclusions – A Cephaometric study

Introduction The objectives of coronal restoration in the Endodontically Treated Teeth (ETT) include rehabilitation of aesthetics, function and prevention of coronal leakage. The long axis of root and the coronal segment in the maxillary anterior teeth varies according to the occlusal scheme. The restorative dentist is required to fabricate the post angulation in compatibility to contour of the adjacent teeth. Aim To evaluate the influence of the angle between the long axes of core facial surface and the radicular segment of the post on fracture resistance of ETT. Materials and methods Total of 30 maxillary intact canines was root canal treated, sectioned 2 mm above the CEJ. The custom made nickel-chromium endodontic posts were fabricated using direct method. The samples were divided among three groups of 10 each. The angle between coronal segment and radicular segment of post in Group-I, Group-II, Group-III were 5°, 10° and 15° respectively. The teeth samples were cemented with full veneer metal crown and tested under universal testing machine. The static load at the angle of 130° was applied until the fracture to record the fracture strength. The obtained data was statistically analysed with ANOVA and Tukey post-hoc test. Results The Group-III showed the highest fracture strength with 666.15 N. The Group-II and Group-I recorded the mean fracture strength at 443.37 N and 276.74 N respectively. Conclusion The endodontic post with higher angle between the long axis of facial surface and radicular segment long axis had the positive correlation to the fracture strength in ETT.

Influence of Post Angulation between Coronal and Radicular Segment on the Fracture Resistance of Endodontically Treated Teeth.

The angulation of the maxillary central incisor crown to its root has been measured in 191 patients representing the four classes of incisor malocclusion. Significant differences were only found between Class II Division 1 and Class II Division 2 groups.

The crown to root angle of maxillary central incisors in different incisal classes.

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The crown to root angle of maxillary central incisors in different incisal classes.