Results 21 to 30 of about 39,673 (219)

Redescription of the Triassic cynodont Cistecynodon parvus and reassessment of its phylogeny

The Anatomical Record, EarlyView.
Abstract Cynodontia is an important subclade of Therapsida that first occurred in the late Permian. It includes extinct subclades which are the non‐mammaliaform cynodonts and Mammaliaformes, with the latter ultimately giving rise to crown mammals. The systematics of non‐mammaliaform cynodonts has been extensively studied and is relatively well‐resolved,
Erin S. Lund, Frederik P. Wolvaardt, Roger M. H. Smith, Jaganmoy Jodder, Julien Benoit   +4 more
wiley   +1 more source

Widespread distribution of large silesaurids evidenced by a new record from the Middle Triassic of southwest Gondwana

The Anatomical Record, EarlyView.
The largest silesaurid known from South America is described here, demonstrating that silesaurids reached large body sizes in southwestern Gondwana. This discovery further underscores the widespread geographic distribution and temporal persistence of large silesaurids across Pangea, despite faunal turnovers and environmental events such as the Carnian ...
Rodrigo Temp Müller
wiley   +1 more source

Deep learning-based tooth axis estimation from 3D tooth crowns using quaternion representation and multi-loss optimization

Scientific Reports
Tooth axis estimation plays a key role in various digital dental workflows, including orthodontic diagnosis and prosthetic design. In clinical practice, tooth axes are typically determined by jointly considering crown morphology and radiographic ...
Geunhye Kim, Sena Lee, Junghun Han, Eun-Hack Andrew Choi, Yongkyu Jin, Chooryung Judi Chung, Sejung Yang   +6 more
doaj   +1 more source

Multidisciplinary Treatment Of Fracture And Luxation Of Immature Permanent Teeth

International Dental Journal
Introduction: The management of anterior tooth luxation with concomitant subgingival root fracture necessitates a multidisciplinary approach that considers biological, functional, and aesthetic factors.
Haojie Yu, Zhu Haihua, Zhu Fudong
doaj   +1 more source

Early stages of tooth development in the harbor porpoise Phocoena phocoena

The Anatomical Record, EarlyView.
Abstract Here we describe the stages of tooth development in toothed whales on the basis of the harbor porpoise (Phocoena phocoena). The aim of the study was to find out whether these stages are identical to those of other mammals analyzed so far although toothed whales are homodont and monophyodont.
Lasse M. Mathes, Lennart Müller‐Thomsen, Stefan Huggenberger   +2 more
wiley   +1 more source

Effect of Adhesive Materials in Re-Attachment of Crown and Crown–Root Fractures of Permanent Maxillary Anterior Tooth: A Computational Study

Mathematical and Computational Applications, 2023
Traumatic dental injuries (TDI) are frequent among individuals of all ages, with a prevalence ranging from 12–22%, with crown and crown–root fractures being the most common. Fragment reattachment using light-cured nanocomposites is the recommended method
Anshika Garg, Shubham Gupta, Nitesh Tewari, Sukeshana Srivastav, Arnab Chanda   +4 more
doaj   +1 more source

Oldest well‐preserved euprimate petrosal, from the early Eocene of India (Vastan Lignite Mine, Gujarat)

The Anatomical Record, EarlyView.
Abstract An exquisitely preserved, isolated partial petrosal with associated fragmentary stapes is described from the Vastan Lignite Mine (Gujarat, India), dated to the early Eocene (~54.5 Ma). Several anatomical traits (e.g., large petrosal plate; posterolateral entry of the internal carotid artery to the tympanic cavity; bony tubes surrounding the ...
Mary T. Silcox, Kenneth D. Rose, Rachel H. Dunn, Kishor Kumar, Rajendra S. Rana, Ashok Sahni, Lachham Singh, Thierry Smith, Jordan W. Crowell   +8 more
wiley   +1 more source

Dental anomalies in Pleistocene African hippopotamuses from Olduvai Bed II

The Anatomical Record, EarlyView.
Abstract Hippopotamuses are key palaeoenvironmental indicators in African Pleistocene ecosystems due to their ecological dependence on permanent water bodies and their frequent representation in the fossil record. This study examines dental anomalies in Hippopotamus cf. gorgops from several localities in Bed II of Olduvai Gorge (Tanzania), dated to ca.
Darío Fidalgo, Faysal Bibi, Jean‐Renaud Boisserie, Jackson K. Njau, Ignacio de la Torre   +4 more
wiley   +1 more source

Errors Measuring and Tracing of Planar Tooth Internal Gear Enveloping Crown Worm Tooth Surface

工程科学与技术, 2016
:As a new worm drive, planar tooth internal gear enveloping crown worm drive is composed of a planar tooth internal gear and a crown worm generated by the planar tooth internal gear surface.
chenyan, 殷国富
doaj  

All-Ceramic Crown Tooth Preparation and Provisional Crown Fabrication

MedEdPORTAL, 2009
This 30-minute instructional video depicts the step-by-step procedures required for the preparation of a maxillary central incisor for an all-ceramic full coverage restoration and the fabrication of a provisional restoration in a mannequin. The recording
Cecilia Aragon
doaj   +1 more source