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The Influence of Bone Mechanical Properties and Implant Fixation Upon Bone Loading Around Oral Implants
Published in J. Middleton, M. L. Jones, G. N. Pande, Computer Methods in Biomechanics & Biomedical Engineering – 2, 2020
H. Van Oosterwyck, J. Vander Sloten, M. De Cooman, S. Lievens, R. Puers, J. Duyck, I. Naert
Another effect that is examined is the presence of a lamina dura : for implants which have become successfully osseointegrated bone densification at the interface can often be observed. The thin dense layer of bone surrounding the implant is called the lamina dura.
Effectiveness of iodoform-based filling materials in root canal treatment of deciduous teeth: a systematic review and meta-analysis
Published in Biomaterial Investigations in Dentistry, 2022
Manoelito Ferreira Silva Junior, Leticia Maíra Wambier, Mayara Vitorino Gevert, Ana Cláudia Rodrigues Chibinski
The radiographical failure was assessed by: (1) the presence of radiographic lesions [10,17]; (2) absence of reduction in the size of radiolucent area in the intra-radicular [27,36] or inter-radicular region [9,11–13,19,29,30,36–38], including the furcation [14,28,36,37] or periapical region [12,14,15,19,21,28–30]; (3) the absence of continuity of lamina dura [12,14,15,27]; (4) the absence of normal periodontal ligament space [21,37]; (5) the presence of external [12,17,21,27,28,30,38] or internal [12,21,27,28,30,38] root resorption [14,19,37]; (6) the presence of new radiolucency formed after of treatment [10,28]; (7) the presence of radiolucency involving the successor tooth germ [19]; (8) the presence of change in the direction of the successor tooth [17,35,36]; (9) the absence of bone regeneration [9,12,13,15,20,27,30]; (10) the absence of filling material in the root canal [17]; (11) the absence of extruded material extraradicularly [17]; (12) the absence of resorption of extravasated material [13,35,36] with physiologic root resorption [35,36].
Influence of fiber insertion and different material type on stress distribution in endocrown restorations: a 3D-FEA study
Published in Computer Methods in Biomechanics and Biomedical Engineering, 2022
Gulhan Yildirim, Cihan Demir, Melahat Çelik Güven, Osman Koç, Evrim Eligüzeloglu Dalkiliç
A three-dimensional (3D) model of a mandibular first molar tooth was digitized with a micro-CT (Computed Tomography) scanner system (InEos X5, Sirona Dental Systems GmbH, Bensheim, Germany). This blue light lab scanner is accredited to be accurate within 2.1 microns (ISO 12836) (Etemad-Shahidi et al. 2020). The sample size was determined by using a sample size calculation with 95% confidence level and a margin of error of 5%. This has been confirmed by previous studies as acceptable to achieve statistically significant results (Mangano et al. 2017; Kang et al. 2020). Point clouds were obtained from these scans and were exported in stereolithography (STL) format. The file in STL format was processed in the Spaceclaim CAD software program (SpaceClaim Corporation; Canonsburg, PA, USA). The solid tooth model and its sub-components were obtained according to the point density. The periodontal ligament (PDL) and cortical bone were simulated around the models. The FEA models were modeled with 0.2 mm thickness periodontal ligament, 0.3 mm thickness lamina dura, and the cortical and trabecular bone were generated. Cortical bone structure was constructed with a 2 mm thickness (Kraus et al. 1969).
Investigating orthodontic tooth movement: challenges and future directions
Published in Journal of the Royal Society of New Zealand, 2020
Fiona A. Firth, Rachel Farrar, Mauro Farella
There is no distinct lamina dura around rat teeth, the cortical bone is thin; they lack the vasculature and intra-cortical osteons of human jawbones and bone turnover is extremely rapid (Milne et al. 2009; Ibrahim et al. 2017). Despite these differences, they do have similar cellular and molecular changes during OTM so are still considered an appropriate model and are widely used (Ibrahim et al. 2017). Rodent models have been used to investigate mechanotransduction and stress/strain profiles using finite element models (FEM), combining in vitro and in vivo investigations (Kawarizadeh et al. 2004; Viecilli et al. 2009). It is anticipated that the continued development of FEM in OTM research will further aid in increasing our knowledge in this field.