Evaluation of Mandibular Projection in Class II Division 2 Subjects Following Orthodontic Treatment Using Clear Aligners.

Aim: The purpose of this study was to evaluate the mandibular growth and/or projection following maxillary incisor proclination, overbite correction, and maxillary dentoalveolar expansion without the use of any class II mechanics, in growing class II division 2 patients treated with clear aligners.

Materials And Methods: Before and after treatment cone-beam computed tomographic (CBCT) generated lateral and posteroanterior cephalograms of thirty-two patients with skeletal class II division 2, 16 in the treatment group and 16 in the untreated group, were reviewed to evaluate treatment-related changes. Upper incisors were proclined and protruded, as well as upper arch expansion and overbite correction were performed as part of their regular treatment.

The effect of orthodontic bracket base shape on shear bond strength to human enamel, an study.

The purpose of this study was to evaluate the effect of orthodontic bracket base shape on shear bond strength (SBS) to human enamel and assess the nature of debonding fractures using the Adhesive Remnant Index (ARI). Orthodontic brackets with different-shaped bases (flower, heart, rectangle) were bonded to 120 extracted human third molars. Shear bond strength was measured using a Servohydraulic Test System at 24 h and 2 months after bonding.

Cephalometric effects of Twin-block and van Beek Headgear-Activator in the correction of Class II malocclusion.

Introduction: The Twin-block (TB) and the van Beek Headgear-Activator (vBHGA) are indicated for patients with Class II malocclusion with a retrognathic mandible. Although the former is commonly prescribed for horizontally growing patients, the latter is often recommended for those growing vertically. This study aimed to compare the skeletal, dentoalveolar, and soft-tissue short-term effects of TB and vBHGA, taking growth patterns into account.

Current status of undergraduate orthodontic education in Canada.

Purpose: This study evaluated teaching hours and mode of instruction of undergraduate orthodontic education dental students in Canada receive, changes implemented by each educational dental institution (EDI) in response to the COVID-19 pandemic, and plans for mode of orthodontic education delivery post-COVID-19.

Methods: An electronic survey was administered to the program directors of undergraduate orthodontics at each EDI to reveal details regarding the (i) time and details of didactic, preclinical, and clinical experience provided to students and (ii) perceptions of undergraduate program directors about the adequacy of the current curricula.

Results: All 10 Canadian EDIs participated in the survey during the year 2021.

Adult patient preference for an orthodontic care provider in Canada.

Introduction: This study evaluated the factors influencing potential orthodontic patients' choice between an orthodontist, general dentist (GD), and direct-to-consumer (DTC) aligners for their treatment and their choice of orthodontic appliance type and explored their motivating factors for seeking orthodontic treatment and preference for appliance type.

Methods: An electronic survey was administered to 330 Canadian adults to determine demographic background, choice of the orthodontic treatment provider, the preferred mode of treatment, orthodontic issues they wished to address, and motivation for treatment.

Results: When participants were asked their preference in provider type, 49.

Orthodontists' perceptions of and adaptations to nonspecialist and direct-to-consumer orthodontic service providers.

Objectives: To evaluate orthodontists' perceived impacts on their practices as a result of general practitioners (GPs) and direct-to-consumer (DTC) orthodontic care providers and the adaptational changes implemented in the past 10 years.

Materials And Methods: An electronic survey was administered to 270 orthodontists in Canada and the United States to determine demographic background, perception of perceived impact, and specific changes implemented to improve practice competitiveness.

Results: More experienced orthodontists (P = .

Quality of life in an adolescent orthodontic population.

Objectives: To investigate adolescent orthodontic patient experiences and quality of life with fixed appliances compared to Invisalign.

Materials And Methods: Adolescent patients in active treatment with Invisalign or fixed appliances for a minimum of 6 months were provided with the Child Oral Health Impact Profile-Short Form 19 questionnaire, along with additional items of interest that were assessed separately. Pearson's χ2 test was used to compare responses (P < .

Effect of Low Intensity Pulsed Ultrasound (LIPUS) on Tooth Movement and Root Resorption: A Prospective Multi-Center Randomized Controlled Trial.

The aim of this study was to evaluate the possible effect of low intensity pulsed ultrasound (LIPUS) on tooth movement and root resorption in orthodontic patients. Twenty-one patients were included in a split-mouth study design (group 1). Ten additional patients were included with no LIPUS device being used and this group was used as the negative control group (group 2).

Comparison of AdvanSync and intermaxillary elastics in the correction of Class II malocclusions: A retrospective clinical study.

Introduction: Our objectives were to compare the skeletal, dentoalveolar, and soft tissue effects of the AdvanSync appliance (Ormco, Glendora, Calif) with intermaxillary elastics in the correction of Class II malocclusions in growing patients.

Methods: A retrospective study was conducted using lateral cephalograms of patients taken before and after comprehensive orthodontic treatment; 41 patients consecutively treated with the AdvanSync were compared with 41 similar patients treated with intermaxillary Class II elastics. All patients had significant growth potential during treatment, as assessed by cervical vertebral maturation.

An investigation into bisphenol A leaching from materials used intraorally.

Background: In this study, the authors quantitatively determined the bisphenol A (BPA) leached from intraoral materials during simulated intraoral exposure.

Methods: The authors subjected samples of intraoral materials to simulated abrasion, immersion in artificial saliva, thermal shock via temperature cycling, and simulated intraoral exposure. The authors collected sample aliquots for up to 2 weeks after artificial saliva immersion, derivatized, and then analyzed the aliquots for BPA by gas chromatography and mass spectroscopy.

Changes in mandibular incisor position and arch form resulting from Invisalign correction of the crowded dentition treated nonextraction.

Objective: To investigate changes in mandibular incisor position resulting from Invisalign correction of the crowded dentition without extraction.

Materials And Methods: A retrospective chart review was completed on 61 adult White patients. Patients were categorized into three groups based on the value of pretreatment crowding of the lower dentition: 20 mild (2.

An investigation into bisphenol-A leaching from orthodontic materials.

Objective: To quantitatively determine the bisphenol-A (BPA) leached from orthodontic materials during simulated intraoral exposure.

Materials And Methods: Samples of orthodontic materials were subjected to simulated abrasion, immersion in artificial saliva, thermal shock via temperature cycling, and simulated intraoral exposure. Sample aliquots were collected for up to 2 weeks after artificial saliva immersion, derivatized, then analyzed for BPA by gas chromatography/mass spectroscopy.

Use of cone-beam computed tomography in the diagnosis of sensory nerve paresthesia secondary to orthodontic tooth movement: a clinical report.

In this article, we report an incident of transient neuropathy secondary to tooth movement involving the inferior alveolar nerve. This clinical report reflects the need to thoroughly examine potentially high-risk patients for neuropathy using advanced diagnostic tools such as cone-beam computed tomography when diagnosing and planning treatment.

Differences in the gingival crevicular fluid composition between adults and adolescents undergoing orthodontic treatment.

Objectives: To investigate differences in the gingival crevicular fluid (GCF) composition between adolescent and adult patients undergoing orthodontic treatment with fixed appliances.

Materials And Methods: Ten adolescents (14.4 ± 1.

Graduate orthodontic education in Turkey: the residents' perspective.

The aim of the present study was to explore residents' perceptions of their educational and clinical treatment experiences including the number of clinical cases undertaken, patient completion rates, techniques utilised and the scientific component of Turkish graduate orthodontic programmes. Residents recorded in the list of Turkish Orthodontic Society were sent an e-mail to participate in a survey containing 46 multiple-choice questions and ten one-line answers. An e-mail with a personalised online link was sent to a total of 227 residents throughout the Turkey.

Digital analysis of staining properties of clear aesthetic brackets.

Objective: To analyse the staining properties of clear orthodontic brackets using a digital analysis.

Design: In vitro, laboratory study

Material And Methods: A total of 500 tooth-coloured brackets from 10 brands (five ceramic and five plastic) were investigated. The cumulative discolouring effect of staining agents (tea, coffee, curry and red wine) were analysed at two consumption levels: light and heavy, based on a 6-month period of exposure.

Relapse of orthodontically corrected deepbites in accordance with growth pattern.

Introduction: A common orthodontic problem is a deep overbite malocclusion. Because of its high relapse tendency, it is also one of the most challenging problems to treat. To minimize relapse, the morphologic characteristics of patients need to be considered.

In vitro shearing force testing of two seventh generation self-etching primers.

Objective: The purpose of this study was to evaluate the in vitro shearing force performance of orthodontic attachments using two self-etching primers (SEPs): iBOND and G-Bond.

Design: In vitro, laboratory study.

Material And Methods: One hundred and eighty human molars were randomly divided into four groups and again into three sub-groups with 15 teeth each.

Leadership development for program directors.

Background: Residency program directors have increasingly challenging roles, but they may not be receiving adequate leadership development.

Objective: To assess and facilitate program directors' leadership self-awareness and development at a workshop retreat.

Methods: At our annual program director retreat, program directors and associate program directors from a variety of specialties completed the Thomas-Kilmann Conflict Mode Instrument (TKI), which evaluates an individual's behavior in conflict situations, and the Hersey-Blanchard Situational Leadership (HBSL) model, which measures individuals' preferred leadership style in working with followers.

Effect of tooth bleaching on shear bond strength of a fluoride-releasing sealant.

Objective: To evaluate the effect of an in-office plus at-home bleaching protocol on shear bond strength of orthodontic buttons when using a fluoride-releasing sealant.

Materials And Methods: Extracted human molars (160) were randomly divided into bleached (n  =  80) and unbleached groups (n  =  80). The bleached group was treated with 45% carbamide peroxide for 30 minutes, followed by five applications of 20% carbamide peroxide at 24-hour intervals.

Impact of orthodontic retainers on periodontal health status assessed by biomarkers in gingival crevicular fluid.

Objective: To evaluate whether biomarkers of inflammation and periodontal remodeling are differentially expressed in the gingival crevicular fluid (GCF) of patients wearing different types of orthodontic retainers.

Materials And Methods: Thirty-one adult subjects (17 men and 14 women with an age range of 20 to 35 years) were allocated to three different groups. Group 1 consisted of 10 patients wearing fixed retainers, group 2 included 11 patients using lower removable retainers, and group 3 comprised 10 patients without retainers (control).

Motivations of orthodontic residents in Canada and the United States to treat patients with craniofacial anomalies, cleft lip/palate, and special needs.

Objectives: To determine the motivation of orthodontic residents in Canada and the United States to treat patients with cleft lip/palate (CLP), craniofacial anomalies (CFA), and special needs (SN).

Methods: In March 2009, an e-mail with a link to a 41-item survey was sent to all orthodontic residents in Canada and the United States (n  =  944).

Results: Of 944 residents contacted, 339 viewed and 208 completed the survey (22.

Esthetics and smile characteristics evaluated by laypersons.

Objective: To collect data regarding Canadian laypersons' perceptions of smile esthetics and compare these data to US data in order to evaluate cultural differences.

Materials And Methods: Using Adobe Photoshop 7, a digital image of a posed smile of a sexually ambiguous lower face was prepared so that hard and soft tissue could be manipulated to alter buccal corridor (BC), gingival display (GD), occlusal cant (OC), maxillary midline to face discrepancy (MMFD), and lateral central gingival discrepancy (LCGD). Adult Canadian laypersons (n  =  103) completed an interactive computer-based survey of 29 randomized images to compare smile preferences for these variables.