Wurtzite structured ZnS nanoribbons have been synthesized by a catalyst-free solid–vapor deposition technique. The nanoribbon has a saw-teeth shape, and the nanosaw is formed by a two-step process: a fast growth along a-axis forms the body of the saw; a subsequent growth along c-axis creates the teeth. The one-sided teeth structure is suggested to be the self-catalyzed growth of the Znterminate...

Investigating ontogenetic variation and allometry in the mandible can provide valuable insight and aid in addressing questions related to the ontogeny of the skull. Here, patterns of ontogenetic shape change and allometric trajectories were examined in the mandible of 187 sub-adult and adult humans, bonobos, and chimpanzees. Procrustes-based geometric morphometrics was employed to quantify and ...

Newly found fossil shark teeth of a sleeper shark are described. This is probably an undescribed species of the genus Centroselachus belonging to the Family Somniosidae. These fossil teeth were discovered from the Middle Miocene Iseyama Formation(Northern Fossa Magna Region), Ueda City, Nagano Prefecture, central Japan. These teeth indicate the shape of a part of a symphysial tooth row, which b...

A study of 150 extracted maxillary first premolars from citizens of Seville, Andalusía, southern Spain, revealed 60 teeth with one root (40.0%), 85 teeth with two roots (56.7%) and five teeth with three roots (3.3%). The distribution of root canal shapes in the sample showed that all teeth with two or three roots had type I root canals (each canal had one apical foramen). Conversely, most of th...

Clinicians are constantly challenged with matching one or two incisors to the remaining natural teeth because of the multidimensional properties of color and shape. Single-shade restorations will not adequately match the natural tooth structure and, therefore, will not satisfy most patient expectations. This article describes the steps involved in treatment planning, treatment, laboratory commu...

Background and Aim: One of the important characteristics of nickel-titanium (Ni-Ti) rotary files is their dentin removal ability. The purpose of this study was to compare One Shape and F6 SkyTaper files in terms of dentin removal from the mesiobuccal canals of extracted first mandibular molars. Materials and Methods: In this experimental study, 24 mesiobuccal canals of extracted first mandib...

Fusion and gemination are not entirely uncommon dental anomalies that may also be named ‘double teeth’. This is due to their unusual presentation in a twin-like fashion. Teeth with these irregularities appear clinically similar, presenting as large bulbous shape anatomy fissure patterns. The exact aetiology of uncertain, but many potential local or systemic disturbances during the morphodiffere...

Introduction Tooth loss remains a significant health problem even in developed countries such as the United States. Our research focuses on the development of non-synthetic, bioengineered materials for dental and craniofacial tissue engineering. We hypothesize that dental stem cells harvested from extracted teeth provides a potential source for human progenitor cells for tissue engineering. Our...

Ceramic veneers are considered a conservative solution for patients requiring improvement of the shape, color, or position of their anterior teeth. Ceramic veneers have been extensively and successfully used to mask intrinsic staining, to give the appearance of straightening, and to correct minor malformations of anterior teeth without the removal of substantial amounts of sound tooth substance...

The case report presented here is of a 4-year-old girl with severely decayed maxillary anterior teeth. After root canal treatment, the primary maxillary central and lateral incisors were reinforced using polyethylene fiber-reinforced composite resin short posts and restored using celluloid strip crowns. The technique described here offers a simple and effective method for restoring severely dec...