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Alveolar Cleft Bone Grafting (Part II): Secondary Bone Grafting
Published in Niall MH McLeod, Peter A Brennan, 50 Landmark Papers every Oral & Maxillofacial Surgeon Should Know, 2020
John Rowson, David Grimes, Cristina Frezzini
There has been controversy about the timing of ABG for some years.1–3 The current consensus seems to have moved to secondary ABG that is carried out after 2 years old and timed to assist eruption of the secondary maxillary dentition. Commonly this is to accommodate the maxillary canine but surgery may done be earlier to accommodate the lateral incisor in some patients and there are a small number of centres who prefer earlier grafting at about 6 years as a routine. In the United Kingdom the consensus is to coincide with eruption of the canine or, where indicated, the lateral incisor.4 Most sources agree that delay until adulthood is to be avoided if possible although there will be exceptions where this becomes necessary.
Radiosurgical Techniques
Published in Jeffrey A Sherman, Oral Radiosurgery, 2020
A 19-year-old female was seen for cosmetic restoration of the maxillary right lateral incisor. Radiosurgery was used to expose the subgingival decay as well as to reestablish a normal gingival architecture.
Numerical analysis of support structures on an adhesive dental bridge
Published in J. Belinha, R.M. Natal Jorge, J.C. Reis Campos, Mário A.P. Vaz, João Manuel, R.S. Tavares, Biodental Engineering V, 2019
G.A.R. Caldas, J. Belinha, R.M. Natal Jorge
In this work, a 3D model was constructed from CT scans, Figure 1. Using anonymized CT scans, it was possible to obtain the geometric shape of the maxilla of the unknow patient. Then, a section of the maxilla was selected and a model consisting of the maxilla bone, the central incisor and a canine, was obtained. As it is possible to observe in Figure 2, this model simulates the lack of the lateral incisor. The structures considered were: dentin (Patch 3 and 4), cortical bone (Patch 1) and trabecular bone (Patch 2). To perform the numerical analysis of the problem, the biological structures were discretized into an element mesh, as demonstrated in Figure 2. The materials considered have an elastic, homogeneous and isotropic linear behaviour. The material properties of the biological structures presented in the model can be found in Table 1. It was investigated in the literature the ultimate tension stress for each of the materials, so it could then be compare to the maximum von Mises stress obtained with the present analyses. The ultimate tension stress of each of the materials is presented in Table 2.
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.
Associations between Bolton ratio and overjet deviations in a Finnish adult population
Published in Acta Odontologica Scandinavica, 2021
Heini Turtinen, Millamari Sarja, Jussi Hyvärinen, Paavo Pirhonen, Paula Pesonen, Pertti Pirttiniemi, Anna-Sofia Silvola
The results of this study suggest that overjet deviations partly result from variations of teeth width, in particular maxillary anterior teeth widths. The most common sporadic teeth size disharmony is peg-shaped lateral incisor [25]. In the present study, a larger variation of the maxillary right lateral incisor mesiodistal width was found, matching the existence of peg-shaped lateral incisors. It has been suggested that maxillary mesiodistal lateral incisor tooth size is smaller in Angle Class III population, and that partly explains the anterior Bolton tooth size discrepancy [2]. The widths of lower incisors did not differ between the overjet groups, which highlights the importance to evaluate specifically the maxillary incisor and canine widths in clinical practice.
Peri-implant bone resorption risk of anterior maxilla narrow single implants: a finite-element analysis
Published in Biomaterial Investigations in Dentistry, 2022
Ivan Onone Gialain, Leonardo Folmer Rodrigues da Silva, Marlene Kasumi Gantier Takano, Rafael Yagüe Ballester, Marina Guimarães Roscoe, Josete Barbosa Cruz Meira
Eight models of implant supporting lateral incisor crowns in the anterior maxilla were constructed (Figure 1) using Rhino3D software (version 7, Robert McNeel & Associates, Seattle, WA). MSC.Apex and MSC.Marc programs (MSC Software, Santa Ana, CA, USA) were used in the following steps of the finite element analysis. The implant geometries were modeled based on a NeoPoros dental implant (NeoDent, Curitiba, Brazil), combining four different diameters and two lengths (Table 1). The cone-morse abutment (model 114.753, NeoDent, Curitiba, Brazil) and the full-ceramic crown (imported from Brenes tooth library) were adjusted to the implant diameter, maintaining the same position and inclination for all models, but different buccal bone thickness (Figure 1 and Table 1).