Assessment of pharyngeal airway in Korean adolescents according to skeletal pattern, sex, and cervical vertebral maturation: A cross-sectional CBCT study.

Objective: To investigate airway volumes using cone-beam computed tomography (CBCT) by skeletal patterns, sex, and cervical vertebral maturation (CVM) stages in Korean adolescents.

Methods: The sample consisted of pretreatment CBCT and cephalograms of 95 adolescents (aged 12-19) obtained out of 1,611 patients examined for orthodontic treatment from 2018 to 2020 in Kyungpook National University Dental Hospital. The samples were classified into two sex groups; three skeletal pattern groups, four chronological age groups and four CVM stages.

Alveolar bone thickness and height changes following incisor retraction treatment with microimplants.

Objectives: To evaluate alveolar bone remodeling following incisor retraction treatment with microimplants and to examine the relationship between crown/root distal movement and thickness/height changes of the alveolus.

Materials And Methods: A total of 24 patients (mean age, 19.29 ± 4.

Evaluation of clinical parameters for the stability of 2 types of miniscrews.

Introduction: The purpose of this research was to compare insertion techniques and effects on mechanical and clinical parameters between 2 types of miniscrews.

Methods: Forty-four consecutive patients whose orthodontic treatment involved the use of miniscrews (miniscrew A [MA] and miniscrew B [MB]) for anchorage were included in this study. Miniscrews were placed with predrilling or self-drilling; peak maximum insertion torque (MIT) and Periotest values were measured.

Correlation between insertion torque and peri-implant bone strain during placement of orthodontic mini-implants: A finite element study.

Introduction: Insertion torque is the amount of torque exerted on the implant to tighten into the bone. We investigated whether insertion torque values could be correlated with the strain level in the peri-implant cortical bone resulting from mini-implant insertion.

Methods: The insertion of a standard size mini-implant (φ 1.

Effectiveness of Tongue Crib Combination Treating Severe Skeletal Angle Class III Malocclusion in Mixed Dentition.

Objective: To evaluate the treatment effects of tongue crib combination for treating severe skeletal Angle class III malocclusion in mixed dentition by X-ray cephalometric analysis.

Materials And Methods: A sample of 22 patients with severe skeletal Angle class III malocclusion of deficiency maxilla and overgrown mandible in mixed dentition was prospectively collected and equally divided into two groups. The patients (males 6 and females 5; mean age 8.

Biomechanical analysis for total distalization of the maxillary dentition: A finite element study.

Introduction: This study aimed to identify the tooth movement patterns relative to various force angulations (FAs) when distalizing the total maxillary dentition.

Methods: Long-term orthodontic movement of the maxillary dentition was simulated by accumulating the initial displacement of teeth produced by elastic deflection of the periodontal ligament using a finite element analysis. Distalization forces of 3 N were applied to the archwire between the maxillary canine and first premolar at 5 different FAs (-30°, -15°, 0°, 15°, and 30°) to the occlusal plane.

Stability of immediately loaded 3 mm long miniscrew implants: a feasibility study.

Introduction: Shorter miniscrew implants (MSIs) are needed to make orthodontics more effective and efficient.

Objective: To evaluate the stability, insertion torque, removal torque and pain associated with 3 mm long MSIs placed in humans by a novice clinician.

Methods: 82 MSIs were placed in the buccal maxillae of 26 adults.

Biomechanical analysis for total mesialization of the maxillary dentition: A finite element study.

Introduction: The purpose of this study was to analyze and clarify tooth movement during mesialization of the whole maxillary dentition with various force angulations (FAs).

Methods: A finite element method was used to simulate the long-term orthodontic movement of the maxillary dentition by accumulating the initial displacement of teeth produced by elastic deformation of the periodontal ligament. A mesial force of 3 N was applied to the maxillary second molar at 5 different FAs (-30°, -15°, 0°, 15°, and 30°) to the occlusal plane.

Estimation of the prevalence of malocclusion on the basis of nationwide oral health examinations of pre-adolescent and adolescent students during 2012-2017.

Objective: To investigate the prevalence of malocclusion with respect to grade, sex, and year among Korean pre-adolescent and adolescent students during 2012-2017.

Methods: A total of 165,996 students (first grade [E1, 6-7 years of age], fourth grade [E4, 9-10 years], seventh grade [M1, 12-13 years], and tenth grade [H1, 15-16 years]) were selected by stratified sampling method and underwent the nationwide oral health examination performed by the Ministry of Education, Republic of Korea. The malocclusion assessments based on dentists' judgments were "no malocclusion," "needs orthodontic treatment (N-OTx)," and "under orthodontic treatment (U-OTx).

Comparison of inclination and vertical changes between single-wire and double-wire retraction techniques in lingual orthodontics.

Objective: The Heat Induction Typodont System (HITS), used in some recent studies, has a distinct advantage over previous tooth movement simulation methods. This study aimed to compare inclination and vertical changes between the single-wire and double-wire techniques during retraction with different lengths of lever arms in lingual orthodontics using an upgraded version of the HITS.

Methods: Duet lingual brackets, which have two main slots, were used in this study.

Evaluations of miniscrew type-dependent mechanical stability.

Background: Miniscrew has been widely used as an absolute anchorage in orthodontic treatment. Types of miniscrew with different diameter, length, shape, and thread dimensions may have a substantial effect on mechanical stability of the miniscrew system. Thus, the objective of this study was to evaluate miniscrew type-dependent mechanical stability to assess mechanical properties of miniscrew systems in various thickness of artificial bone block using different measurement tools.

Biomechanical analysis for total mesialization of the mandibular dentition: A finite element study.

Objectives: To clarify the mechanics of tooth movement in mesialization of the whole mandibular dentition when changing the force angulation.

Setting: A finite element method was used to simulate long-term movements of the whole mandibular dentition.

Material And Methods: Tooth movement was simulated by accumulating the initial displacement, which was produced by elastic deformation of the periodontal ligament.

Mechanical and clinical evaluation of the effect of microscrew on root proximity and cortical bone thickness.

Background/objectives: Primary stability is required for successful use of microscrew. This study investigated correlations among biomechanical, morphological, and clinical values in relationship to root contact and different placement locations.

Materials/methods: Thirty-three microscrews were placed between the molars (n = 18) or in the body of the mandible (n = 15) in three pigs.

Biomechanical analysis for total distalization of the mandibular dentition: A finite element study.

Introduction: The aim of this finite element study was to analyze and clarify the mechanics of tooth movement patterns for total distalization of the mandibular dentition based on force angulation.

Methods: Long-term orthodontic movement of the mandibular dentition was simulated by accumulating the initial displacement of teeth produced by elastic deformation of the periodontal ligament.

Results: Displacement of each tooth was caused by movement of the whole dentition, elastic deflection of the archwire, and clearance gap between the archwire and bracket slot.

Identification of eight meta-signature miRNAs as potential biomarkers for oropharyngeal cancers.

Background: Oropharyngeal Cancers (OC) is a commonly-seen disease with a high risk. The earlier studies of miRNAs on this disease were restricted by factors as sequencing platform, filtration conditions, causing the inconformity in the obtained result. We aimed to explore the miRNA biomarkers that can function as the predictive and therapeutic markers.

Long-term changes of the anterior palatal alveolar bone after treatment with bialveolar protrusion, evaluated with computed tomography.

This case report describes the treatment of a 31-year-old woman with a convex profile, protrusive maxilla, retrusive mandible, and gummy smile. Four premolars were extracted, and micro-implant anchorage was used to retract the anterior teeth. Lip protrusion and the gummy smile were improved, but the computed tomography images showed dehiscence on the palatal alveolar bone of the maxillary incisors.

Effects of bracket slot size during retraction of the six maxillary anterior teeth using an induction-heating typodont simulation system.

Objective: To investigate how bracket slot size affects the direction of maxillary anterior tooth movement when retraction is performed in sliding mechanics using an induction-heating typodont simulation system.

Methods: An induction-heating typodont simulation system was designed based on the Calorific Machine system. The typodont included metal anterior and resin posterior teeth embedded in a sticky wax arch.

Incorporation of silver nanoparticles on the surface of orthodontic microimplants to achieve antimicrobial properties.

Objective: Microbial aggregation around dental implants can lead to loss/loosening of the implants. This study was aimed at surface treating titanium microimplants with silver nanoparticles (AgNPs) to achieve antibacterial properties.

Methods: AgNP-modified titanium microimplants (Ti-nAg) were prepared using two methods.

Effect of longitudinal flutes on miniscrew implant stability and 3-dimensional bone formation.

Introduction: The purpose of this study was to evaluate the effects of longitudinal flutes on miniscrew implant (MSI) stability and bone healing.

Methods: Using 11 skeletally mature New Zealand white rabbits, we placed 31 longitudinally fluted and 31 nonfluted, 3-mm-long MSIs in standardized positions in their calvaria and immediately loaded them with 100 g using nickel-titanium coil springs. Insertion torque values were obtained for each MSI placed; removal torque values were obtained for 28 MSIs that had been in place for 6 weeks and 20 MSIs that had been in place for 2 weeks.

Stress Distribution in Obliquely Inserted Orthodontic Miniscrews Evaluated by Three-Dimensional Finite-Element Analysis.

Purpose: The purpose of this study was to evaluate the influence of placement angle and force direction on the initial stability of orthodontic miniscrews using a three-dimensional finite element model that approximates the real interface between the screw and surrounding bone.

Materials And Methods: Three-dimensional finite element models with 6-mm-long and 1.4-mm-diameter titanium miniscrews were used.

Genetic polymorphisms in pattern recognition receptors and risk of periodontitis: Evidence based on 12,793 subjects.

Pattern recognition receptors (PRRs) constitute a pivotal arm of innate immunity. Many studies investigated the association between PRRs polymorphisms and periodontitis risk, which showed inconclusive results. The aim of the meta-analysis was to evaluate the precise association between five widely-evaluated polymorphisms (CD14 -260C/T (rs2569190), Toll-like receptor (TLR) 2 2408G/A (rs5743708), TLR4 896A/G (rs4986790), TLR4 1196C/T (rs4986791), mannose-binding lectin (MBL) codon 54 (rs1800450)) within the PRRs and susceptibility to either chronic (CP) or aggressive periodontitis (AgP).

Increased Zn/Glutathione Levels and Higher Superoxide Dismutase-1 Activity as Biomarkers of Oxidative Stress in Women with Long-Term Dental Amalgam Fillings: Correlation between Mercury/Aluminium Levels (in Hair) and Antioxidant Systems in Plasma.

Background: The induction of oxidative stress by Hg can affect antioxidant enzymes. However, epidemiological studies have failed to establish clear association between dental fillings presence and health problems.

Objectives: To determine whether heavy metals (in hair), antioxidant enzymes (SOD-1) and glutathione levels could be affected by the chronic presence of heavy metals in women who had dental amalgam fillings.

Laser-treated stainless steel mini-screw implants: 3D surface roughness, bone-implant contact, and fracture resistance analysis.

Background/objectives: This study investigated the biomechanical properties and bone-implant intersurface response of machined and laser surface-treated stainless steel (SS) mini-screw implants (MSIs).

Material And Methods: Forty-eight 1.3mm in diameter and 6mm long SS MSIs were divided into two groups.