Rutile titania powders were synthesized via a sol-gel/hydrothermal process using nitric acid as the catalyst. A molar acid to alkoxide ratio of 10 and a water to alkoxide molar ratio of 250 produced 100% rutile powders when precipitated below 45 °C. Higher temperatures yielded initially either anatase or mixtures of anatase and rutile. Spherulitic growth produced cauliflower-shaped agglomerates...

Background & Aims: Before the surgery of lower impacted third molars, it is essential to evaluate the relationship of the roots to mandibular canal using radiographies in order to avoid postoperative complications. The purpose of this study was to evaluate the reliability of panoramic radiographs in assessing this relationship. Methods: This was a prospective study. The study population consist...

Introduction: The objective of this study was to gather information about normal occlusion and arch dimensions in the primary teeth of the children belonging to an Iranian population. Methods: This descriptive cross-sectional study was performed on 68 children from the city of Mashhad in the 3-5 age range. Dental arch dimensions, interrelationships of primary canine and second molars, overbite ...

BACKGROUND Mesial protraction of mandibular posterior teeth requires increased anchorage to avoid undesired tooth movements. Orthodontic mini-implants have become a popular and successful way to increase skeletal anchorage in such cases. However, mini-implants may cause injury to adjacent teeth or anatomical structures and may lead to tissue inflammation. Induced ankylosed primary teeth have be...

AIM Impaction of deciduous teeth is an uncommon event. The purpose of this report is to describe two unusual eruption failures of a second primary molar and their treatment management. CASE REPORT The diagnostic and therapeutic protocol of two cases selected at the Unit of Paediatric Dentistry, Department of Oral and Maxillofacial Science, "Sapienza" University of Rome, Italy, are presented. ...

Primary human fibroblasts and a series of cell lines (A549, BNL CL.2, H225, NIH 3T3 and Rat-1) are efficiently transfected by using positively charged complexes of plasmid DNA and transferrin-polylysine or polylysine in the presence of glycerol (1 molar to 1.8 molar, depending on the cell type). An increase in gene expression of up to several-hundredfold (compared to complexes without glycerol)...

The reaction of 6-amino-1,3-dimethylpyrimidine-2,4(1H,3H)-dione (1) as a binucleophile with primary aromatic or heterocyclic amines and formaldehyde or aromatic (heterocyclic) aldehydes in a molar ratio (1:1:2) gave the pyrimido[4,5-d]pyrimidin-2,4-dione ring systems 2-5. Treatment of 1 with diamines and formalin in molar ratio (2:1:4) gave the bis-pyrimido[4,5-d]pyrimidin-2,4-diones 6-8. Furth...

The purpose of this study was to develop a model describing the sites and patterns of dental caries in the mixed dentition for children with one of five caries experiences in the primary dentition. Dental records were used from 317 children followed an average of 7.8 years in private pediatric dental offices to assess specific caries experiences in children from early primary dentition to middl...

Background. The preferred treatment method of most hydatidiform moles is suction aspiration. In rare circumstances uterine abnormalities may preclude surgical treatment. Case. We report a case of complete molar pregnancy successfully treated with methotrexate followed by EMA/CO. A 38-year-old woman with a complete hydatidiform mole and multiple uterine fibroids underwent a failed attempt at suc...

The reported incidence of ectopic eruption ranges from 2 to 4.3% of the population.^ Treatment modalities have been divided into two categories: interproximal wedging and distal tipping. Interproximal wedging is indicated when there is minimal impaction of the first permanent molar on the distal aspect of the second primary molar. When the impaction is severe, distal tipping techniques are requ...