background and aims. the majority of failures in class ii amalgam restorations occur in the first primary molar teeth; in addition, use of compomer instead of amalgam for primary molar teeth restorations is a matter of concern. the aim of the present study was to compare the success rate of class ii compomer and amalgam restorations in the first primary molars. materials and methods. a total of...

introduction: traumatic injuries to the teeth are among the most serious dental accidents, with the anterior teeth being mostly affected. some consequences of dental trauma include misshaping, speech defects, psychological and social effects. the knowledge of the field can reduce the suffering, cost, and the time for patients, parents, and health care providers. the aim of this study was to inv...

background & aim: regional odonto dysplasia (rod) is an unusual nonhereditary of teeth with significantly clinical and radiographic features. affected teeth usually remain unerupted or semi-erupted with a discolaration and irregular shape. radiographically these teeth have a large pulp chamber and thin layer of enamel and dentin with similar density. this article is introducing a female patient...

congenitally missing of maxillary lateral incisors is one of the most common patterns of hypodontia. this paper presents a nine year old boy with congenital missing of lateral incisors. familial history showed that, his mother, aunts, uncle and grandmother have also congenital absence of lateral incisors.

introduction: comparison of the relationships and distance between maxillary root tips and   the maxillary sinus floor using oral panoramic in the dolichocephalic and brachycephalic compared to mesocephalic individuals. methods: oral panoramic images from 300 individuals were analyzed and the relationships and distance between the maxillary root tips and the sinus floor was assessed by qualitat...

introduction: this study investigated the sealing ability of three different adhesives in primary bovine teeth. methods: facial and lingual class v cavities were prepared half in enamel and half in cementum, in 48 bovine primary mandibular incisors and randomly divided into three groups and each group divided to two subgroups. the tested adhesives were xpbond (xp), clearfils3 bond (s3), and xen...

introduction: nasal teeth eruption is a rare phenomenon. the variability of symptoms and generic history makes the diagnosis difficult. this difficulty is more challenging when the tooth is placed in the depth of septum.   case report: our case is an example of this problem. herein, we present a case of intraseptal tooth with nasal obstruction and septal deviation and recurrent sinusitis. we pr...

New multicomponent domino reactions of arylglyoxals with pyrazol-5-amines have been established, providing selective access to unprecedented pyrazolo-fused 1,7-naphthyridines, 1,3-diazocanes, and pyrroles (up to 52 examples). The unreported dipyrazolo-fused 1,7-naphthyridines were regioselectively synthesized through a special double [3 + 2 + 1] heteroannulation accompanied by direct C-C format...

Common environmental chemicals, drugs, or physical agents can adversely affect human teeth during their embryonic development and after their eruption into the oral cavity. One of the more common elemental toxicants is lead. Teeth are known to accumulate lead during their development. Both animal and human studies have shown that teeth with high lead levels are generally more susceptible to den...