Catalogue of Etruscan and Roman-era dental appliances
Marshall Joseph Becker, Jean MacIntosh Turfa in The Etruscans and the History of Dentistry, 2017
The right lateral incisor and canine appear to be angled toward the medial area, probably in response to the periodontal conditions that were causing dental loss of the central incisors. Not mentioned in the publication is a flake of burned bone shown lodged within the gold prosthesis against the lingual surface of the right lateral incisor. The right premolars were present at death, but the roots probably became dislodged from their sockets after cremation. The second premolar socket has what appears to be an abscess at its base. The socket for the right first molar is so extensively damaged as to preclude any evaluation. The extent of the post-cremation bone loss suggests that a tooth had been in place at death. Had that tooth been lost, bone formation at the site probably would have survived combustion. The Minozzi et al. (2007) text suggests that the region of the corpus below the second and third molars does not survive, but the illustration in Catalano et al. (2007) reveals that the area below both teeth is present, although extensively damaged.
The Science of Tooth Whitening
Linda Greenwall in Tooth Whitening Techniques, 2017
Studies have shown that the fastest teeth to whiten are the upper lateral incisors. This is because of the anatomy of the lateral incisor teeth. In patients with Class II division 2 malocclusion, when the lateral incisors move forward it is more noticeable that these teeth are whitening more quickly. Upper canines take the longest to whiten because these teeth are situated in the corners of the arch and are responsible for guiding the movement of the rest of the teeth, so they have the longest roots and more and thicker dentin. These upper canines are often much darker and more yellow than the rest of the teeth. Therefore when planning whitening with a patient, it is essential to demonstrate that the upper canines are darker and will take longer to whiten than the adjacent teeth. The central incisors are the baseline to assess the whitening in full; the upper centrals, when whitened, should match each other exactly.
Head, neck and vertebral column
David Heylings, Stephen Carmichael, Samuel Leinster, Janak Saada, Bari M. Logan, Ralph T. Hutchings in McMinn’s Concise Human Anatomy, 2017
The teeth have an interesting history developmentally. Of the statements below, which one is accurate?With regard to the permanent dentition, the first central incisor normally erupts at 6 months of life.With regard to the permanent dentition, the canine teeth erupt first at 7 years of life.With regard to the deciduous dentition, the canine tooth normally starts to erupt at 8 months of life.With regard to the permanent dentition, the first molar tooth normally replaces the first deciduous molar tooth at 12 years of life.With regard to the deciduous dentition, the first molar tooth usually erupts at 12 months
Morphometric analysis for evaluating the relation between incisal guidance angle, occlusal plane angle, and functional temporomandibular joint shape variation
Published in Acta Odontologica Scandinavica, 2018
Seulgi Han, Sang Min Shin, Yong-Seok Choi, So Yeun Kim, Ching-Chang Ko, Yong-Il Kim
From the result, there was a correlation between the incisor guidance angle and the occlusal plane angle. This interaction was reflected in the mandibular movement because the chewing activity is affected by both incisor guidance angle and occlusal plane. Occlusal plane is a functional plane that formed in consequence of tooth and alveolar bone growth and development [23,24]. The complex of intrinsic genetic factors and extrinsic environmental factors are reflected in the occlusal plane by interaction of jaw, muscle and teeth [25,26]. Thus, it has a great clinical importance to analyse an adaptation of tooth and alveolar bone to a craniofacial structure and its dysplasia through occlusal plane [27]. Therefore, it is clinically meaningful to observe the incisal guidance and occlusal plane angle, which was adapted from the facial growth.
Findings in ancient Egyptian mummies from tomb KV64, Valley of the Kings, Luxor, with evidence of a rheumatic disease
Published in Scandinavian Journal of Rheumatology, 2023
LM Öhrström, R Seiler, S Bickel, F Rühli
The dentition is in quite good condition: no teeth were lost during life as a result of caries or periodontitis. However, the antemortem loss of the left upper lateral incisor in the anterior upper jaw led to an aesthetic impairment. Dental wear is pronounced but age appropriate, and a ‘common condition seen in predynastic and dynastic skulls’ (10). In ancient Egypt, massive abrasion was common owing to the widespread consumption of bread, which contained a lot of mineral fragments. Most affected are the earliest erupting first molars (score 4); least affected are the wisdom teeth (score 2–3). The frequency of caries lesions by tooth is low, comparable to that detailed by Buzon and Bombak (11) or McConnan Borstad and Lovell (12). In contrast to the good condition of the teeth, the massive changes in the TMJs are astonishing. There is no lack of support in the posterior dentition by missing molar teeth, which has been discussed as an aetiological factor for osteoarthritis of the TMJ. Furthermore, because of the compensatory mechanisms of the masticatory apparatus (13), dental wear cannot cause such a massive change in the TMJ.
Influence of resin cement rigidity on the stress distribution of resin-bonded fixed partial dentures
Published in Computer Methods in Biomechanics and Biomedical Engineering, 2019
Marcela M. Penteado, João P. M. Tribst, Ana L. B. Jurema, Guilherme S. F. A. Saavedra, Alexandre L. S. Borges
For the finite element modelling, the three-dimensional (3D) model was created based in a stereolitografy file obtained in a previous article (Tribst et al. 2018). The file composed by a complete skull was imported to the computer aided design software (Rhinoceros 6.0, McNeel North America, USA) and a slice performed (using a Boolean split with two normal planes) in the anterior region, between canine and upper central incisor. After that, polylines were used to delimit surfaces and polysurfaces for each geometry of the 3D model. Following this method, the resin-bonded fixed partial dentures was designed to contain an upper central incisor and canine as retainers and lateral incisor as pontic. The final model consisted of enamel, dentin, periodontal ligament, medullar bone, cortical bone, cement and prosthesis (Figure 1). Each geometry presented the same number of contact faces with the adjacent geometry in order to guarantee intimate contact between the bodies and absence of defects. The cortical bone model was 1 mm thick surrounding the dental abutments. The thickness of the periodontal ligament was uniformly distributed along 0.3 mm thick roots (Dal Piva et al. 2017). The curve of Spee and curve of the incisal edges was maintained to ensure real positioning of the dental abutments movement during load incidence.
Related Knowledge Centers
- Deciduous Teeth
- Mandible
- Mandibular Central Incisor
- Maxillary Lateral Incisor
- Tooth
- Premaxilla
- Maxillary Central Incisor
- Mandibular Lateral Incisor
- Permanent Teeth
- Tooth Eruption