Aim: To investigate the application of Bolton’s ratios in the proper diagnosis and treatment planning for Chinese orthodontic patients with congenitally missing mandibular incisor. Materials and Methods: Twenty-seven Chinese cases (males 10, females 17) with congenitally missing mandibular incisor and class I molar relationship were recruited in this study. Guided by the anterior Bolton’s ratio...

PURPOSE The purpose of this study was to examine the patient- and treatment-related etiologic factors of external root resorption. MATERIALS AND METHODS This study consisted of 163 patients who had completed orthodontic treatments and taken the pre- and post-treatment panoramic and lateral cephalometric radiographs. The length of tooth was measured from the tooth apex to the incisal edge or c...

F ollowing extraction of a natal or neonatal tooth, continued growth of the dental papilla may occur and a tooth-like form may develop.'^ This report describes an atypical tooth form (probably the result of continued growth of the retained dental papilla) that abscessed and may have caused delayed eruption of the adjacent primary lateral incisor. A 13-month-old white male presented to the autho...

Enucleation of the incisor germinal center and extraction of molars in the mandibles of young hamsters produced a significant decrease in the size of the mandibular body, loss of normal occlusion, and a shift of the mandibular body medially and cranially. Condylectomies mainly affected the length of the mandible and were closely related to loss of the articular cartilage and impairment of ramal...

This teenage patient presents with pronounced esthetic and functional dental concerns. An anterior frontal view of the patient’s dentition shows virtually total facial blockage of the maxillary right central incisor creating mesial contact of the right lateral incisor with the left central incisor immediately lingual to the blocked out right central incisor. A similar severe misalignment takes ...

OBJECTIVE To evaluate the degree of perception of laypersons, dental professionals, and students with regard to the esthetics of the smile in cases of mandibular incisor extractions with the presence of black spaces between them. MATERIALS AND METHODS Changes were made to a front-view intraoral photograph of occlusion treated by means of a mandibular incisor extraction, simulating various con...

The role of third molars in causing late mandibular incisor crowd ing is controversial. Various studies have been conducted to eva luate their relationshi p. The purpose of this article is to (a) rev iew the studies regarding the mandibular third molars and late mandibular arch crowd ing (b) fi nd out the cause and effect re lat ionship between them (c) eva luate the just ificat ion of prophyla...

Objective: To determine the frequency of patients who require extraction of permanent premolars among those treated with extraction of deciduous teeth for the correction of incisor crowding in the mixed dentition and analyze possible associated variables. Methods: The sample was composed of orthodontic records of 70 patients with permanent dentition whose treatment had begun in the mixed dentit...