Hexacoordinated Co(III) complexes bearing three C,O-bidentate ligands (9a and 9b) were prepared from 1-bromo-2-(p-tolyloxymethyl)benzene (8a) and 1-bromo-2,6-bis(p-tolyloxymethyl)benzene (8b), respectively. Both complexes were stable in air at room temperature. X-ray analyses revealed that the structures of both complexes were essentially the same. According to variable temperature H NMR study,...

Extended Average Level (EAL) Dirac-Fock calculations on atoms and ions agree with earlier work in that a rough shell-filling order for the elements 119-172 is 8s < 5g≤ 8p(1/2) < 6f < 7d < 9s < 9p(1/2) < 8p(3/2). The present Periodic Table develops further that of Fricke, Greiner and Waber [Theor. Chim. Acta 1971, 21, 235] by formally assigning the elements 121-164 to (nlj) slots on the basis of...

Lateral luxation of permanent teeth is a common injury, and the most frequent post-injury complications is Pulp Canal Obliteration (PCO) followed by pulp necrosis and root resorption. This report presents two different prognoses for symmetrical immature maxillary central incisors after lateral luxation in a 7-year-old boy. Both teeth were laterally luxated and the gingiva distal to the left inc...

Odontomas are a common type of odontogenic tumor, usually asymptomatic and mostly detected on routine radiographic examination. An 11-years-old male child with the chief complaint of mobility of deciduous dentition in the upper front region was diagnosed with an odontome with an impacted central incisor, missing lateral incisor and retained deciduous incisors following radiographic analysis. Hi...

A study was performed to examine the correlation between maxillary central incisor tooth form and face form in males and females in an Indian population. The selection of prosthetic teeth for edentulous patients is a primary issue in denture esthetics, especially in the case of maxillary central incisors, which are the most prominent teeth in the arch. Two hundred dental students of Indian orig...

for treating an impacted, dilacerated maxillary central incisor in the mixed dentition. A new fixed appliance promotes proper sagittal and vertical traction of the incisor into the dental arch, while maintaining the patient’s periodontal health and preserving root length. The appliance is an .040" stainless steel fixed lingual arch, soldered to the lingual surfaces of the maxillary first molar ...

OBJECTIVES The aim of this study was to evaluate the effects of damping on stress concentration in an impacted incisor. METHODS Damping ratios of maxillary incisors were tested using an in vivo modal testing method. A finite element model of the upper central incisor was established for dental trauma analysis. To assess the effect of damping properties on induced stresses in the traumatized i...

A 51-year-old woman who worked as a company sales representative was concerned about the deteriorating condition of her anterior teeth. On presentation, the appearance of her anterior teeth was less than ideal, and she requested treatment to improve the situation. Her medical history was noncontributory, but intraoral examination revealed excessive diastema between the maxillary central incisor...

This is a case report of a patient who presented to Wenzhou Medical University--Orthodontic Department at 8 years of age with missing right maxillary central incisor. A detailed clinical and radiographic examination was carried out and treatment plan formulated to surgically expose the impacted incisor and use the modified nance arch (MNA) appliance for orthodontic traction of the tooth in line...

In this study, stress of traumatized incisor and the effect of stress on tooth and alveolar bone was studied with two-dimensional photoelasticity. Two homogeneous two-dimensional maxillary central incisor models were prepared. Loads were applied to the labial side of incisal edge and middle third of the crown at angles of 45 degrees and 90 degrees. It was observed that stress was increased on t...