Journal of Orthodontic Science最新文献

Objectives: To compare lateral cephalometric variables based on McNamara analysis between Indigenous and Chinese-Indonesian ethnic patients with skeletal class I malocclusion from Medan city.

Materials and methods: Simple random sampling of retrospective data from pre-treatment lateral cephalograms of orthodontic adult patients of three successive generations of the Mongoloid race in Medan from 2015 to 2023. Thus, the unpaired t-test and Mann-Whitney test were conducted after the normality test to compare the cephalometric analysis between Indigenous and Chinese-Indonesian ethnicities.

Results: This cross-sectional study analyzed 32 Indigenous and 34 Chinese ethnic lateral cephalograms. There were significant differences (P < 0.05) between Indigenous and Chinese ethnic in the lower pharynx, nasolabial angle, A to N perpendicular, maxillomandibular differential, and Pog to N Perpendicular variables for skeletal parameters. There were also significant differences (P < 0.05) in nasolabial angle for the soft tissue parameter and lower pharynx for the airway parameter. Conversely, there were no significant differences (P > 0.05) between these groups in the Co-A, Co-gnathion, lower anterior facial height (LAFH), facial axis angle, and mandibular plane angle for skeletal parameters. There were also no significant differences (P > 0.05) in upper incisor to A and lower incisor to A-Pog for dental parameters. Furthermore, there were also no significant differences (P > 0.05) in cant of the upper lip for soft tissue parameters and upper pharynx for airway.

Conclusions: It is advisable to consider certain landmarks and reference lines based on McNamara cephalometry parameters that showed a significant difference between Indigenous and Chinese ethnic groups with skeletal class I malocclusion when determining diagnosis and formulating individualized orthodontic treatment plans for multiethnic subpopulation patients in Medan.

Objectives: This study aimed to determine the accuracy of overbite correction in patients with deep bite using the clear aligner therapy (CAT).

Materials and methods: This retrospective study included 31 patients prescribed orthodontic treatment using CAT from January 2020 to January 2024. Clinical information was collected via X-ray results at pre-treatment and post-treatment stages. Treatment outcomes were measured at three stages: pre-treatment, post-treatment (clinical results), and predict treatment (predict results) as programmed in ClinCheck®.

Results: Significant changes were observed in X-ray in both overbite (3.85 ± 1.38 mm to 2.93 ± 1.13 mm) and overjet (5.19 ± 1.79 mm to 3.43 ± 1.14 mm) following CAT. For clinical crown lengthening (CCL) of tooth 31, significant differences were noted between pre-treatment and post-treatment (-0.31 ± 0.66 mm) and between predicted and clinical results (-0.21 ± 0.58 mm). For CCL of tooth 41, significant differences were found between pre-treatment and post-treatment (-0.36 ± 0.66 mm) and between prediction and post-treatment (-0.32 ± 0.65 mm). The percentage of deep bites differed significantly between pre-treatment vs predicted treatment (38.10 ± 14.90%), pre-treatment vs post-treatment (11.80 ± 14.30%), and predicted treatment vs post-treatment (-26.40 ± 12.60%). Similar trends were observed in mean overbite (2.77 ± 1.07 mm, 0.69 ± 0.93 mm, and - 2.08 ± 0.83 mm, respectively).

Conclusions: Our findings support the use of CAT as a reliable and aesthetic option for treating deep bite malocclusions.

Background: Dental maturity assessment is crucial for orthodontic treatment planning, especially in children with cleft lip and palate (CLP), as they often exhibit delayed dental development. The correlation between dental, skeletal, and chronological age remains uncertain, particularly in complex cases like CLP.

Objective: The aim of this study was to compare the development of permanent teeth in children with cleft lip and palate (CLP) to that of normal children without CLP of the same age and gender.

Materials and methods: The study evaluated panoramic radiographs from 240 children with CLP (112 males, 128 females, ages 5-15, mean age 9.28 years) and 350 healthy controls (187 males, 163 females). Dental age was assessed using the Demirjian method, which evaluates the mineralization stages of seven mandibular teeth on the left side. Radiographs were coded to minimize bias, and dental maturity scores were converted to dental age using gender-specific conversion tables.

Results: No significant difference in dental age was observed between children with and without CLP across most age groups. However, at age 9, male CLP patients exhibited significantly delayed dental maturity compared to females. High correlations were noted between dental and chronological ages in both groups.

Conclusion: Dental maturity in Saudi children with CLP is generally comparable to their non-CLP counterparts, except for delayed dental development in males at age 9.

The objectives of this systematic review are to identify the factors influencing the treatment duration to resolve impacted maxillary canines and to evaluate the time duration to resolve maxillary impacted canines considering these factors. A comprehensive electronic database search was conducted within a limited time period (from 01/01/2001 to 31/12/2023). The literature was sought and collected through PubMed, LILACS, Web of Science, Scopus, and EBSCO. The protocol was registered as CRD42024476064 in the PROSPERO database (http://www.crd.york.ac.uk/PROSPERO). The selection criteria were based on PI(E)COS. The searches retrieved 678 unique citations. Titles and abstracts identified 264 full articles, from which 19 remained after the inclusion criteria were applied. Factors such as the patient's age, the position and angulation of the impacted canine relative to the midline and lateral incisor, the side of the impaction, and the technique used to address the impaction have a statistically significant impact on the treatment duration for impacted canines. However, the influence of the patient's sex on treatment duration remains inconclusive.

Background: Retention preserves the optimal esthetic and functional positions of teeth following the termination of active orthodontic treatment. Conventional stainless-steel multistrand fixed retainers have limitations and drawbacks, mainly related to retainer failure.

Objectives: Nano-ceramic hybrid resin (SprintRay OnX) was employed to fabricate new, customized three-dimensional (3D)-printed lingual retainers, and their debonding forces and failure modes were evaluated.

Materials and methods: Pairs of premolars were embedded in acrylic blocks. Fifty acrylic blocks were divided into five groups, including three different cross-sections of customized 3D-printed wires- round (1 mm), oval (1 × 1.5 mm), and semi-elliptical (1 × 1.5 mm)- and comparative stainless steel multistrand retainers (G and H and Respond). Retainers were bonded to the teeth using Transbond™ LR Light Cure Adhesive. The models were stored in distilled water for 24 hours, simulating the wet intraoral conditions. Debonding forces and failure modes were then evaluated. A vertical debonding force was applied to the interdental area of the bonded retainer. Post-retainer debonding failure mode was examined under a stereomicroscope (×10 magnification).

Results: Semi-elliptical 3D-printed retainers yielded the highest debonding forces, followed by oval 3D-printed retainers, twisted G and H retainers, round 3D-printed retainers, and Respond retainers. The debonding forces of oval and semi-elliptical 3D-printed retainers did not differ significantly. The 3D-printed retainer groups presented predominantly cohesive failure due to the strong adhesion between the 3D-printed resin and adhesive.

Conclusion: Oval and semi-elliptical 3D-printed retainers exhibited favorable debonding forces.

Background: On every patient's lateral cephalogram, the frontal and maxillary sinuses are the most often seen paranasal sinuses. Impacted teeth alter the morphology of the frontal and maxillary sinuses. Consequently, it has an impact on the patient's look and occlusion.

Objective: To determine the mean height, width, and index of maxillary and frontal sinuses and compare them among high, average, and low-angle patients underwent orthodontic treatment.

Material and methods: A total of 192 cephalometric radiographs of patients who presented with malalignment of teeth having high, average, and low angles and underwent orthodontic treatment were selected. On radiograph, frontal sinus, maxillary sinus, and cephalometric landmarks were traced. Patients were divided into different classes of skeletal vertical malocclusion. The morphology of maxillary and frontal sinuses on lateral cephalogram was measured. Means ± SDs of the quantitative variable were calculated. ANOVA test was applied to compare maxillary and frontal sinus heights, widths, and indexes between high-angle, average-angle, and low-angle patients.

Results: The mean ± SD of height, width, and index of frontal sinus was 30.41 ± 2.59, 10.81 ± 1.53, and 3.44 ± 0.68, respectively, while these findings for maxillary sinus were 40.09 ± 2.36, 36.33 ± 3.38, and 1.11 ± 0.07, respectively. The mean frontal sinus width was significantly different among profile angles (P < 0.001), while the mean maxillary sinus width, mean maxillary sinus width, and mean maxillary sinus index were significantly different among profile angles with P < 0.001.

Conclusion: In comparison to high- and low-angle profiles, the frontal sinus width was greater in the average angle profile. The average width, breadth, and index in the maxillary sinus varied statistically between different angle profiles. In comparison to high- and low-angle profiles, the height, width, and index of the maxillary sinus were all higher in the average angle profile.

Objective: With good communication and information retention being key aspects of valid consent, this study aimed to assess adult patient information recall immediately after an orthodontic consultation.

Materials and methods: Adults interested in bracket-based or clear aligners were invited to take part at a single private dental practice. A 45-minute consultation with one of three general dental practitioners (GDPs) primarily providing orthodontics took place. A participant self-completed questionnaire tested recall of 20 items from the consultation. Demographics such as gender, age, level of English, education level, previous orthodontic experience and having a close family member or friend who had orthodontic treatment were also recorded.

Results: Forty-two participants completed the questionnaire, and the information recall rate was 75% (mean score = 15). Three of the 42 participants recalled all 20 items. No statistically significant differences (P < 0.05) were found between information recall and any demographic variable, however, older participants (36 years and over) scored less (mean = 13.83) than participants 18-25 years (mean = 15.6).

Conclusions: A quarter of information provided during an orthodontic consultation with a GDP in a private dental practice cannot be recalled immediately afterwards by patients and so it is recommended that any verbal or visual information is always supplemented with written information.

Objective: This retrospective study aimed to investigate the association between orthodontic treatment and development of temporomandibular disorders (TMDs) in pediatric patients.

Methods: This study analyzed 122 pediatric patients (age 10-18 years) who underwent orthodontic treatment. The inclusion criteria included comprehensive orthodontic records and substantial clinical documentation, while the exclusion criteria targeted preexisting TMDs or syndromes affecting the temporomandibular joint. Demographic details, treatment characteristics, and radiographic analyses, including standardized cephalometric measurements, were recorded. Clinical records were systematically reviewed for signs and symptoms of TMD, with categorization based on TMD severity using the Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD).

Results: Demographic characteristics revealed a mean age of 14.2 years, with a sex distribution of 36.9% males and 63.1% females. Pain, clicking/popping sounds, and limited jaw movement were reported by 23.0%, 16.4%, and 12.3% of the patients, respectively. TMD severity classification showed that 73.8% had no symptoms, 20.5% had mild symptoms, 4.1% had moderate symptoms, and 1.6% had severe symptoms. Statistical analyses revealed a significant association between TMD symptoms and sex (P = 0.023). Correlations among TMD severity, treatment duration (P = 0.036), and cephalometric changes were observed. Radiographic findings showed a moderate correlation with the gonial angle (r = 0.42) and a strong correlation with the condylar position (r = 0.58).

Conclusion: This study provides insights into the complex relationship between orthodontic treatment and TMD development in pediatric patients. These findings suggest potential associations between treatment characteristics, cephalometric changes, and TMD symptoms.

Context: Assessing and monitoring treatment quality within graduate courses are vital for maintaining high standards and addressing areas needing improvement. In this study, we evaluated the treatment quality delivered by measuring the total scores obtained from the comprehensive clinical assessment (CCA) index and the objective grading system (OGS) index.

Aims: This study aimed to evaluate the quality of orthodontic treatments administered by graduate students by using the CCA index and OGS index.

Settings and design: The research was carried out at the Orthodontic Department of Mashhad School of Dentistry, focusing on a cross-sectional analysis of orthodontic treatments administered by graduate students.

Methods and material: The study randomly selected 36 cases from the department's archives and evaluated them through pre- and post-treatment analyses, including radiographs, photographs, and dental casts. The evaluation employed the CCA and the OGS indices.

Statistical analysis used: Data analysis was performed using the Spearman and Mann-Whitney tests.

Results: The CCA correlated with the patient's age and gender and was statistically significant (P = 0.007 and P = 0.010, respectively). The CCA index was substantially associated with treatment duration (P = 0.032 a). There was no significant relationship between OGS and CCA (P = 0.223). The mean of post-treatment OGS was 18.97. All criteria of OGS and the overall score were improved significantly (P < 0.001).

Conclusions: The results of this study suggested that orthodontic treatment results provided by the investigated program have high scores and meet high standards of the CCA and OGS indices.

Objectives: This in vitro study aimed to determine how three different energy drink types affected the force decay of three distinct brands of clear, short elastomeric chains over various time intervals.

Materials and methods: In this study, 600 pieces of clear, short elastomeric chains from three brands were examined. The initial force was measured immediately using a digital scale and after 1, 7, 14, 21, and 28 days. These intervals followed immersion in the respective energy drink for 5 minutes twice daily. Using one-way ANOVA and Tukey's HSD tests, the percentage of force decay was computed and compared across the different elastic brands, time intervals, and energy drinks.

Results: The force degradation of various elastic brands immersed in different energy drinks increased over time, following a similar pattern of decay. By the end of the fourth week, there were highly significant differences in the force decay percentage, varying from 68% to 83%.

Conclusions: Considering the effects of brands, duration, and energy drinks, all the evaluated brands exhibited similar patterns of force decay, with highly significant differences noted. The force decay in Coca-Cola Energy and Fire ball drinks is relatively higher than in other beverages.