Upper molar morphology of the early oligocene egyptian anthropoidQatrania wingi

2015 ◽  
Vol 159 (4) ◽  
pp. 714-721 ◽  
Author(s):  
K. Christopher Beard ◽  
Pauline M. C. Coster
Keyword(s):  
Early Oligocene ◽  
Molar Morphology ◽  
Upper Molar

Uniquely derived upper molar morphology of Eocene Amphipithecidae (Primates: Anthropoidea): Homology and phylogeny

2013 ◽  
Vol 65 (2) ◽  
pp. 143-155 ◽  
Author(s):  
Pauline Coster ◽  
K. Christopher Beard ◽  
Aung Naing Soe ◽  
Chit Sein ◽  
Yaowalak Chaimanee ◽  
...  
Keyword(s):  
Molar Morphology ◽  
Upper Molar

Reassessment of Lower Eocene Seggeurius amourensis: aspects of primitive dental morphology in the mammalian order Hyracoidea

1993 ◽  
Vol 67 (5) ◽  
pp. 889-893 ◽  
Author(s):  
Nicholas Court ◽  
Mohamed Mahboubi
Keyword(s):  
Dental Material ◽  
Dental Morphology ◽  
Crown Height ◽  
Lower Eocene ◽  
Precise Characterization ◽  
Molar Morphology ◽  
Upper Molar ◽  
Lower Molar

New lower dental material of the fossil hyracoid mammal, Seggeurius amourensis Crochet, 1986, from Eocene deposits of the Southern Atlas in Algeria, has prompted a reevaluation of the genus. The dentition as a whole is first described in detail, thus providing a more precise characterization of the genus than has hitherto been available. Peculiarities, particularly in upper molar morphology, are sufficient to uphold a generic distinction. However, based largely on lower molar morphology Seggeurius amourensis is transferred from the subfamily Geniohyinae to Saghatheriinae. In the upper molars, absence of a postmetacrista and the presence of a preprotocrista continuous with the parastyle are interpreted as primitive features in hyracoids. In the lower molars, extreme reduction of the paracristid and the presence of a mesoconid are also considered primitive for hyracoids. These features together with small size, bunodonty, low crown height, and very simple premolar morphology indicate that Seggeurius amourensis is the most primitive hyrax yet recovered.

scholarly journals Upper molar morphology and relationships among higher taxa in bats

2011 ◽  
Vol 92 (2) ◽  
pp. 421-432 ◽  
Author(s):  
Maria Paula Aguiar Fracasso ◽  
Leandro de Oliveira Salles ◽  
Fernando Araújo Perini
Keyword(s):  
Higher Taxa ◽  
Molar Morphology ◽  
Upper Molar

New design for unilateral upper molar distalization with bone anchorage system

2019 ◽  
pp. 1-4
Keyword(s):  
Patient Compliance ◽  
Tooth Movement ◽  
Molar Distalization ◽  
Anchorage System ◽  
Conventional Methods ◽  
Upper Molar ◽  
Bone Anchorage

Molar distalization is considered as a good approach for creating space. Conventional methods were depended on patient compliance but with se of mini screw, tooth movement are done more rapidly, easily and non-compliance. Our design is useful for unilateral upper molar distalization by modified power arm that is connected to mini screw by elastic chain.

scholarly journals Efficiency of the skeletonized Pendulum K appliance for non-compliance maxillary molar distalization

2021 ◽  
Author(s):  
Gero Stefan Michael Kinzinger ◽  
Jan Hourfar ◽  
Jörg Alexander Lisson
Keyword(s):  
Side Effects ◽  
Lower Percentage ◽  
Molar Distalization ◽  
Maxillary Molars ◽  
Maxillary Molar ◽  
Force Moment ◽  
Maxillary Premolars ◽  
Anchorage Loss ◽  
Upper Molar

Abstract Purpose Conventional anchorage with exclusively intraorally anchored appliances for non-compliance molar distalization combines a palatal acrylic button with periodontal anchorage. This type of anchorage is critically discussed because of the temporary hygienic impairment of the palate and the uncertain anchoring quality of the button. A purely dentally/periodontally anchored Pendulum K appliance was developed, which is exclusively anchored via four occlusal rests. The aims of this pilot study were to examine the suitability of the skeletonized Pendulum K for distalization of maxillary molars, and to investigate the quality of this alternative anchoring modality. Patients and methods In all, 10 patients received skeletonized Pendulum K appliances attached to all maxillary premolars for bilateral molar distalization. Supporting anchorage through an acrylic button adjacent to the anterior palate was not used. The pendulum springs were initially activated on both sides with a distalization force of 220 cN each and provided with uprighting and toe-in bends. The specific force/moment system was regularly reactivated intraorally by adjustment of the distal screw. Results The study demonstrates the suitability of the skeletonized Pendulum K appliance for the distalization of maxillary molars (3.28 ± 0.73 mm). Side effects on the molars were slight distal tipping (3.50 ± 2.51°/PP, 3.00 ± 1.41°/SN) and mesial inward rotation (average 2.75 ± 7.50° and 4.50 ± 12.77°). Significant anchorage loss occurred in the form of mesialization of the incisors by 1.40 ± 0.82 mm and of the first premolars by 2.28 ± 0.85 mm. Conclusion The skeletonized Pendulum K appliance allows compliance-free upper molar distalization. Exclusively dental/periodontal anchorage resulted in a lower percentage of molar distalization compared to a conventional anchoring preparation of the Pendulum K with a palatal acrylic button. Anchorage loss had a comparatively stronger effect on the anchoring premolars but less on the incisors. Typical side effects on the molars such as distal tipping and mesial inward rotation were remarkably low.

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