The purpose of the present study was to evaluate accuracy and reliability airway volume digital measurements cone-beam computed tomography (CBCT) compared with manual an model. An acrylic model constructed attached a human dry skull in natural position passage. total internal volumes, as well most constricted area, were measured manually on CBCTs taken after skull. CBCT images analysed using Dolphin3D (Dolphin Imaging & Management solutions, Chatsworth, California, USA) software. Reliability...

The aim of this study was to assess the reliability and reproducibility angular linear measurements conventional digital cephalometric methods.A total 13 landmarks 16 skeletal dental parameters were defined measured on pre-treatment radiographs 30 patients. tracings performed twice by same examiner with a 6 week interval between measurements. within method determined using Pearson's correlation coefficient (r²). methods calculated paired t-test. level statistical significance set at p <...

ABSTRACT Objectives: The aim of this study was to assess the dimensional accuracy fused deposition modeling (FDM)–, Polyjet-, and stereolithography (SLA)–produced models by comparing them traditional plaster casts. Materials A total 12 maxillary mandibular posttreatment orthodontic casts were selected from archives Orthodontic Department at Indiana University School Dentistry. Plaster scanned, saved as files, printed physical using three different three-dimensional (3D) printers: Makerbot...

Abstract Objectives To use the finite element method (FEM) to investigate effect of various attachment configurations and trimming line designs orthodontic aligners on their biomechanical performance. Method A 3D upper jaw model was imported into design software. The right central incisor tooth (Tooth 11) made mobile, its periodontal ligament (PDL) bone structures were designed. Aligners modelled with three distinct configurations: No attachment, rectangular horizontal, vertical, two...

Structured Abstract Objectives To evaluate and compare the accuracy reliability of 3 different methods three‐dimensional cone‐beam computed tomography scans (3D CBCTs) superimpositions: landmark‐based, surface‐based voxel‐based. Materials Methods Pre‐ post‐orthodontic treatment CBCTs (T1 T2) 20 subjects with a mean age 11 years were obtained. Seven points on zygomatic arch supraorbital region selected to perform landmark‐based superimposition. Surface‐based voxel‐based superimpositions...

ABSTRACT Objectives: To compare changes in upper airway volume after maxillary expansion with bone- and tooth-borne appliances adolescents to evaluate the dentoskeletal effects of each modality. Materials Methods: This retrospective study included 36 who had bilateral crossbite received bone-borne (average age: 14.7 years) or 14.4 years). Subjects two cone beam computed tomography images acquired, one before (T1) a second 3-month retention period (T2). Images were oriented, three-dimensional...

Objectives: To investigate and quantify forces generated by three-dimensional-printed aligners made of shape memory polymers (four-dimensional [4D] aligner). Methods: Clear X v1.1 material was used in this study. On a custom-made typodont model, correction maxillary central incisor (tooth 21) malposition 4D with thicknesses 0.8 1.0 mm measured superimposition subsequent scans. Maximum deflection foil sheet specimens were at different temperatures three-point bending (3-PB) tests. In...

To conduct a physiochemical and mechanical material analysis on 3D printed shape-memory aligners in comparison to thermoformed aligners.

Trisomy 21 (Ts21) affects craniofacial precursors in individuals with Down syndrome (DS). The resultant features all Ts21 may significantly affect breathing, eating and speaking. Using mouse models of DS, we have traced the origin DS-associated abnormalities to deficiencies neural crest cell (NCC) early development. Hypothetically, three copies Dyrk1a (dual-specificity tyrosine-(Y)-phosphorylation regulated kinase 1A), a trisomic gene found most humans DS structure. We hypothesized that...

Recent case reports suggest that amnion-chorion membranes (ACM) and dense polytetrafluoroethylene (dPTFE) can be left exposed during ridge preservation. The aim of this study was to compare the effectiveness these in preservation, particularly when they are intentionally exposed.A split-mouth, single-blind, randomized trial design used treatments with two 22 nonmolar sites on same arch. Ridge dimensions were recorded clinically cone beam computed tomography prior 3 months after Postoperative...

As an innovative approach to overcome the rate-limiting staging of conventional aligners, using shape memory polymers (SMPs) as aligners’ materials was investigated in this vitro study. The ability SMPs recover and consequently move tooth, upon appropriate stimuli, evaluated on a typodont model before clinical application. study design achieve 1.9 mm correction movement upper central incisor by one aligner after multiple steps/activation. A custom-made aligned with movable scanned. Using...

This study aimed to report forces and moments delivered by 3D-printed aligners. Tera Harz TC-85 resin Zendura FLX (ZF) thermoformed sheets (0.76 mm) were used. Rectangular strip specimens (50 × 10 0.6 produced for a three-point bending test (3PB) at different temperatures. Full anatomical aligners 3D force measurements on teeth directions 37 °C, using custom-made device. ZF exhibited flexural between 1.7 2.3 N, while from 0.3 N 2.7 with temperature affecting more significantly. At lower...

Cleft lip and palate (CLP) affects the dentoalveolar nasolabial facial regions. Internal external nasal dysmorphology may persist in individuals born with CLP despite surgical interventions. 7–18 year old unilateral bilateral ( n = 50) were retrospectively assessed using cone beam computed tomography. Anterior, middle, posterior airway volumes measured on each side. Septal deviation was at anterior spine, midpoint between these two locations. Data evaluated principal components analysis...

To evaluate the validity and reliability of three-dimensional (3D) landmark-based palatal superimposition digital dental models using Ortho Mechanics Sequential Analyzer (OMSA). The sample consisted pre- post-treatment maxillary 20 orthodontic cases. For each case, were superimposed surface-based methods utilizing 3dMD Vultus Invivo 5 software as well a method OMSA. same set parameters measured on 3D data by three softwares for comparison. Agreement in outcomes among was evaluated with...

Abstract Objective The purpose of this retrospective study was to assess the airway volume changes associated with use Frankel appliance (FR II) in Class II malocclusion patients using three-dimensional cone beam computed tomography (3D CBCT) imaging. Materials and methods sample consisted 31 (mean age 9.24 ± 1.93 years old, 17 males (54.8%) 14 females (45.2%)) treated FR by same orthodontist for an average 9 months 20 days. CBCT images were taken before after treatment upper measured...

Objectives: To introduce a novel method—an electric typodont model—to evaluate the efficacy of 3D-printed orthodontic aligners in correcting rotations upper right central incisor (Tooth 11). Materials and Methods: An fitted with heat-activated wax blocks was employed to simulate four severities rotation Tooth 11: 22°, 32°, 42°, 52°. Each setup scanned treatment planned Maestro 3D software produce sequential per angulation. In total, 240 were three thicknesses (0.50 mm, 0.75 1.00 mm). After...

Abstract Our study aimed to describe the root and canal morphology of mandibular second molars in Emirati population prevalence types morphological change C-shaped configuration along length an effort as a unit. Cone beam computed tomography (CBCT) scans patients were analyzed multiple plans evaluated. Moreover, specific studied reconstructed using 3D reconstruction software. A total 508 Among non-C-shaped molars, two separate roots most prevalent (78.3%). The mesial root's common was...

Desirable molar distalization by bodily movement is challenging and can be difficult to achieve. This study investigated changes in angulation (mesiodistal tipping), inclination (buccolingual torque) rotation during using clear aligner therapy (CAT).