Optimized Orthodontic Palatal Miniscrew Implant Insertion Angulation: A Finite Element Analysis

Abstract

These results showed that, within the limitations of the study, the 30-degree angulation of miniscrew insertion toward the direction of applied force could lower the cortical bone stress and strain.

Individual scoring and mapping of hard and soft tissues of the anterior hard palate for orthodontic miniscrew insertion

“…However, it is also postulated that the cancellous layer, as the initiating point and main part of osseointegration of the orthodontic miniscrew, could play a significant role in the secondary and long‐term stability of miniscrews . As previously shown, when applying a finite element model, different bone qualities with a given constant cortical and cancellous thickness could lead to different transmitted stresses and strains to a miniscrew TAD and its surrounding bone . Subsequently, altered TAD stability is anticipated.…”

“…44 As previously shown, when applying a finite element model, different bone qualities with a given constant cortical and cancellous thickness could lead to different transmitted stresses and strains to a miniscrew TAD and its surrounding bone. 45 Subsequently, altered TAD stability is anticipated. As cited in previously-published studies, the cancellous layer might act as an adjunct stabilizer, or even the primary stabilizer, when the cortical layer is so thin or even absent, which was reflected in the present study where palatal cortical thickness among some of our patients was as low as 0.32 mm (Table 2).…”

“…As cited in previously-published studies, the cancellous layer might act as an adjunct stabilizer, or even the primary stabilizer, when the cortical layer is so thin or even absent, which was reflected in the present study where palatal cortical thickness among some of our patients was as low as 0.32 mm (Table 2). 44,45 We did not assess the possible correlation between the type of malocclusion and hard palate thickness. That could be a future topic of investigation.…”

Monocortical versus bicortical hard palate anchorage with the same total available cortical thickness: a finite element study

“…Thereafter, a miniscrew was modeled using swept cut command (Table and Figure ). This noncommercial miniscrew was designed based on measures of a previous work to depict an average thread profile without any particular specifications such as flute, variable thread design, etc . The miniscrew was inserted in bone block using Boolean subtraction of bone with its full intrabony length in each configuration.…”

“…Many methods are advocated to measure the stability of implanted miniscrews, such as photelasticity, strain gauge, pull/push out strength, resonance frequency, stripping torque, maximum insertion/removing torque, and more recently total reaction force and total strain energy using finite element analysis (FEA) . Finite element method avoids in vitro labor‐intensive and time‐consuming procedures and eliminates the probability of errors by heterogeneity of tested live tissues or samples, while enabling the clinician to test various hypotheses …”