Wire Appliance Research Articles

Therapeutic effect of Micro-Implant Anchorage in orthodontics.

Micro implant anchorage (MIA), as a new orthodontic treatment technique, has the characteristics of simple operation, light trauma, and high stability, and has been widely used in clinical practice. This study compared the therapeutic effects of MIA and the traditional straight wire appliance (SWA) in orthodontic practice. Clinical data of 119 patients who underwent orthodontic treatment in Yulin First Hospital from January 2022 to January 2023 were retrospectively analyzed. According to the treatment records, 61 patients received MIA orthodontic treatment (MIA group), and 58 patients received traditional straight wire appliance (SWA) orthodontic treatment (SWA group). Treatment effect, periodontal index, and levels of osteoprotegerin (OPG), interleukin-6 (IL6) and high-sensitivity C-reactive protein (hsCRP) of the two groups were compared. The total efficacy of MIA group was significantly higher than that of SWA group (P<0.05). After the treatment, bleeding index (BI), plaque index (PLI), probing depth (PD) and looseness in the MIA group were significantly lower than those in the SWA group (P<0.05). After the treatment, levels of OPG were significantly higher, while IL6 and hsCRP levels were significantly lower in the MIA compared to the SWA group (P<0.05). MIA was associated with significantly lower complication rate compared to the SWA (P<0.05). Compared with SWA, MIA is associated with better orthodontic effect. This mode of treatment can increase OPG levels, reduce inflammation, and lower the risk of complications.

Evaluating anchorage and torque control in adolescent patients with Class II Division 1 malocclusion among 3 appliances

The objective of this study was to compare the differences in anchorage and torque control among the Tweed edgewise, Roth, and physiological anchorage Spee-wire systems (PASS) appliances (Zhejiang Xinya Technology Co, Ltd, Hangzhou, China). A sample of 90 adolescent patients with Angle Class II Division 1 malocclusion (30 Tweed edgewise appliances, 30 Roth appliances, and 30 PASS appliances) with maximum anchorage requirements in the maxilla were collected for this study. The pretreatment baseline levels of the 3 groups were compared initially, and then the differences between the 3 appliances in anchorage and torque control were analyzed after superimposing the pretreatment and posttreatment lateral cephalograms and maxillary 3-dimensional (3D) digital models, respectively. There was no statistical difference in the pretreatment baseline levels of 3 groups, including gender, age, sagittal skeletal types (ANB), vertical skeletal types (SN-GoGn), anchorage requirements, and occlusal plane inclination (SN-OP). After superimposing the pretreatment and posttreatment lateral cephalograms and 3D digital models, respectively, no statistical differences were observed between the measurement results obtained from lateral cephalograms and 3D digital models. Among the measurement variables assessed in this study, statistical differences were observed in the mesial displacement of maxillary first molars, the incisor retraction, and the torque variation of maxillary central incisors among the 3 groups. Specifically, the Tweed group exhibited lower mesial displacement of maxillary first molars compared with the PASS and Roth groups. Furthermore, the Tweed group exhibited the greatest amount of incisor retraction and torque variation of maxillary central incisors, followed by the Roth group and then the PASS group. The remaining measurement variables for the 3 groups showed no statistical differences, including vertical variation of maxillary first molars and central incisors, torque variation of maxillary first molars and canines, mesiodistal inclination variation of maxillary first molars and canines, width variation between maxillary first molars, and width variation between maxillary canines. Compared with contemporary preadjusted straight wire appliances, the Tweed edgewise appliance has superiority in molar anchorage control. In contrast, compared with the Roth appliances, the PASS appliances without any auxiliary anchorage devices could make full use of physiological anchorage to achieve adequate control of molar anchorage. Clinical orthodontists may need to pay extra attention to physiological anchorage. The difference in torque control varies depending on the respective characteristics of bracket designs.

Effect of Aligning Forces by Two Preadjusted Edgewise Techniques on a Buccally Positioned Maxillary Canine at Varying Vertical Displacements: A Finite Element Study.

To evaluate the effect of continuous arch and piggyback mechanics in a straight wire appliance (SWA) for the alignment of buccal and variably vertically positioned maxillary canines. A three-dimensional finite element model with near-normal occlusion and buccal and vertically displaced maxillary canines was used. Two groups were created to simulate two commonly used SWAs techniques, continuous archwire (Group 1) and piggyback models (Group 2). Each group had three subgroups with varying vertical displacement of the canine from 2 to 6 mm from the occlusal plane. The displacement and stress distribution were noted in each group. As the vertical displacement increased in Group 1, the concentration of von Mises stress increased progressively at the incisal third (0.36, 0.41 and 0.44 MPa) at 2, 4, and 6 mm, respectively, with decreased maximum occlusal movement in the vertical plane with respect to the canine. Group 2 exhibited a similar pattern but greater occlusal movement of the canine compared with Group 1. A vertical displacement of 4 mm is the optimal level at which continuous arch mechanics should be considered. For displacements beyond 4 mm, the piggyback wire technique is a suitable alternative.

Early orthodontic treatment after periodontal surgery: a randomized controlled trial

The pathological teeth migrations require correct multidisciplinary treatment which consists of periodontal surgery associated with early or late orthodontic treatment. The aim of this study was to know which of the two orthodontic treatments would have a better periodontal response. Two parameters, radiological (the height of the alveolar bone) and clinical (the depth of the periodontal pocket), were used to meet the objective of this work. Eighteen patients received early orthodontic treatment (straight wire appliance) after periodontal flap debridement surgery and eighteen others late orthodontic treatment (straight wire appliance). The results showed the absence of significant difference between the two early and late orthodontic treatments after periodontal flap debridement surgery. Orthodontic treatment can be started early seven to ten days after periodontal surgery.

Technical specification for orthodontic transmission straight wire technique

Malocclusion is an oral disease with a high prevalence. The goal of orthodontic treatment is health, aesthetics, function and stability. The transmission straight wire appliance and technique is an innovative orthodontic system with independent intellectual property rights invented by Professor Jiuxiang Lin's team based on decades of clinical experience, which provides a new solution for the non-surgical correction of skeletal malocclusions, especially class Ⅲ malocclusion, and it is also a good carrier for the implementation of the concept of healthy orthodontics. Due to the lack of guidelines, how to implement standardized application of transmission straight wire technique remains a problem to be solved. This technical specification was formed by combining the guidance from Professor Jiuxiang Lin and joint revision by a number of authoritative experts from the Orthodontic Special Committee, Chinese Stomatological Association, with reference to relevant literatures, and combined with abundant clinical experience of many experts. This specification aims to provide reference to standardize the clinical application of transmission straight wire technique, so as to reduce the risk and complications, and finally to improve the clinical application level of this technique.

Comparative Assessment of Rate of Enmasse Retraction between Low Friction Self-Ligating Appliance and Conventional Straight Wire Appliance with Low Level Laser Therapy – A Clinical Study

Comparative Assessment of Rate of Enmasse Retraction between Low Friction Self-Ligating Appliance and Conventional Straight Wire Appliance with Low Level Laser Therapy – A Clinical Study

Bracket positioning in orthodontics: Past and present

Bracket positioning is a fundamental aspect of orthodontics, resulting in force delivery in three planes of space using the straight wire appliance. Ideal bracket placement aims to achieve esthetic and functional tooth position, with a consonant smile arc, as well as level marginal ridges and interdigitated buccal segments. Variation in bracket positioning alters the expression of the prescription of the straight wire appliance, and consequently tooth position in three planes of space. A variety of approaches have been proposed for ideal bracket positioning, however, shortcomings are evident and detailed in this paper, which reviews the different positioning methods and identifies their shortcomings. Described is a new method of bracket positioning, Smile Arc and Marginal Ridge Approach (SAMRA), designed to achieve the goals of bracket positioning consistently and reliably.

"Zirconia Straight Wire Appliance Combined with Flat Bite Plate for the Treatment of Lingual Tipping Deep Overbite with Undersized Lateral Incisors"

Patient Jiang, Female,25 years old, came to the clinic for irregular teeth. The case was reported as lingual tipping deep overbite with maxillary undersized lateral incisors, which the patient did not accept to restore the malocclusion morphology by denture, resulting in the selection of extraction of bilateral maxillary lateral incisors and mandibular second premolars, and orthodontic treatment by zirconia straight wire appliances combined with flat bite plate.

Clinical contemplation and management of multiple impacted canines

The impaction of the maxillary canines causes relevant a esthetic and functional problems. The multidisciplinary approach to the proper planning and execution of orthodontic traction of the element in question is essential. Many strategies are cited in the literature among the mis the good biomechanical control in order to avoid possible side effects. The aim of this paper is to present a case report in which a superior canines impacted by palatine was pulled out with the aid of direct traction with the help of elastics and arch wires. A 19-year-old male patient reported with a chief complaint of malaligned teeth and missing some teeth. The proposed treatment prioritized the traction of the upper right canine without changing the occlusion and aesthetics. For this, straight wire appliance with .022 slot was inserted in order to minimize unwanted side effects. The use of cantilever to the traction of the upper right canine has enabled an efficient and predictable outcome, because it is of statically determined mechanics. Comprehensive orthodontic therapy along with surgical exposure of 13, 33 and 43 helped in achieving all the treatment objectives to great satisfaction without any adverse effects on the periodontium or the dentition.

Orthodontic extrusion treatment of intrusive maxillary incisors: Two case reports with either incomplete or complete root formation

Treatment of intrusive dislocation after dental trauma is challenging. There is little evidence on the treatment protocol, outcome, and risks during orthodontic extrusion in tooth repositioning. These two case reports aimed to describe and discuss orthodontic extrusion treatment of the intrusive incisors with or without complete root formation using a technique of straight wire appliances. The treatment started 4 weeks after trauma after a failed attempt at spontaneous reeruption. The orthodontic force was controlled at 100-150 g of force at the beginning and 30-50 g of force afterward. Pulp necrosis was observed, and root canal therapy was performed in the intrusive teeth with complete root formation during orthodontic treatment; however, the roots continued growing in those teeth with incomplete root formation. A fixed lingual retainer was applied during mixed dentition. Follow-up showed the stable condition of the intrusive teeth. Orthodontic extrusion could lead to a satisfactory result in repositioning the intrusive teeth. However, additional clinical evidence is needed for a standardized treatment protocol.

Non-extraction Camouflage Treatment of Skeletal Class III Malocclusion

Class III malocclusion can be defined as a skeletal facial deformity that is characterized by a forward mandibular position with respect to the cranial base and or the maxilla. We present a case of a 15-year-old man with skeletal Class III malocclusion who was treated with non-extraction orthodontic camouflage treatment using an orthodontic conventional technique. A fixed appliance, straight wire appliance (SWA) technique was used with a non-extraction treatment plan. Treatment was accompanied by intermaxillary Class III elastics. The total duration of active treatment was 23 months. There was a significant improvement in his occlusion, smile esthetics, and soft tissue profile pattern. Orthodontic camouflage can be considered an effective therapy for correcting milder cases of skeletal Class III malocclusion.

Apolipoprotein E is an effective biomarker for orthodontic tooth movement in patients treated with transmission straight wire appliances

Orthodontic tooth movement (OTM) is the core component of orthodontic treatment and is increasingly popular for treating malocclusions. In this study, we aimed to investigate the role of apolipoprotein E (ApoE) in OTM.Thirty patients treated with transmission straight wire technology were selected and longitudinally tracked at 2 different stages of orthodontic treatment (initial 2 months and 12 months of orthodontic treatment). Total saliva was collected and analyzed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Western blotting was used to detect the difference in ApoE expression in the saliva samples of the 2 groups. The expression of ApoE was further verified by immunohistochemical staining in a mouse model of tooth movement.The results of matrix-assisted laser desorption/ionization time-of-flight mass spectrometry showed significant differences in the components of the salivary peptides in the 2 groups and peptides with a molecular weight of 2010.7 Da were predicted to be ApoE by database analysis. Western blotting further verified a significant difference in the expression of salivary ApoE in the 2 groups. In addition, an OTM model was successfully constructed in mice. The immunohistochemical staining results showed that ApoE expression significantly increased after force loading in the OTM model.This study indicated that ApoE participated in and played a role during OTM in patients treated with transmission straight wire technology. This relationship might be related to alveolar bone reconstruction and root resorption. The results provide new ideas for research on the mechanism of tooth movement using precision medicine based on saliva detection.

Comparative Study of the Effect of Invisible Bracket Appliance and Straight Wire Appliance in Treating Malocclusion Secondary to Adult Periodontitis

Comparative Study of the Effect of Invisible Bracket Appliance and Straight Wire Appliance in Treating Malocclusion Secondary to Adult Periodontitis

A Comparative Evaluation of Space Closure Rate Between Newer Generation Ceramic Brackets and Conventional Straight Wire Appliances

Background: With the emerging concept of aesthetics in orthodontics, ceramic brackets play a major role especially in the anterior region of the dental arch. However, the duration of the orthodontic treatment is one of the most important issues in treating patients with ceramic brackets. Objectives: This study is conducted to compare space closing rate between conventional MBT and Symetri ClearTM bracket systems. Methods: This study is comprised of 18 subjects who were equally separated into two groups. The first group was treated with conventional MBT pre-adjusted bracket and the second group with Symetri ClearTM brackets. Space closure was performed via 0.019 × 0.025 inch stainless steel wires using 9-mm nickel-titanium Sentalloy coil springs with a constant force of 150 g. The distance between the distal of the first molar buccal tube and the mesial of the canine bracket was measured by a digital caliper. The difference of the first and last values was determined to assess the sheer quantity of space closure. The value was then divided by the number of months during which the space closure was carried out to examine the ratio of space closure in mm per month. For the statistical analysis we used paired t test as well as independent t test and the P-value &gt; 0.05 was deemed significant. Results: The MBT group showed a 0.85 mm/appointment retraction rate while the Symetri ClearTM bracket group had a 0.83 mm/appointment retraction rate. The difference in space closing between MBT and Symetri ClearTM groups was not statistically and clinically significant (P-value &gt; 0.05). Conclusions: As the rate of space closure was almost similar in the two types of brackets, we can use Symetri ClearTM brackets instead of MBT brackets without any concern about the duration of treatment and use the esthetic benefits of these brackets simultaneously.

Clinical efficacy of counterclockwise rotating the functional occlusal plane using micro-implant anchorage.

To evaluate the therapeutic effect of using micro-implant anchorage (MIA) to rotate the functional occlusal plane (FOP) counterclockwise. Forty skeletal class Ⅱ high-angle patients who had completed orthodontic treatment were enrolled, including 20 patients treated with MIA orthodontic system (MIA group) and the other 20 patients treated with traditional sliding straight wire appliance (control group). Cephalometric measurements on the lateral cranial radiographs before and after treatment were performed, all acquired data were statistically analyzed with SPSS 26.0. At the end of treatment, MIA group obtained better effect of FOP and mandibular plane counter-clockwise rotation than the control group. In the MIA group, the average change of FOP-frankfort horizontal plane (FH), FOP-SN and mandibular plane angle (MP-FH) angle was -4.5(-7.3, -3.7)°, (3.3)° and -1.7(-3.0, -0.9)°, respectively. In the control group, the average change of FOP-FH, FOP-SN and MP-FH angle was -0.1(-4.1, 3.0)°, (-0.1±5.1)° and -0.4(-2.4, 0.7)°, respectively. There was significant difference between the change of the two groups (all <0.05). Compared with the traditional sliding straight wire appliance, counterclockwise rotation of FOP can be more effectively reversed by using MIA orthodontic system, and the MP-FH can be reduced as well.

Study on the changes of soft and hard tissue before and after early treatment of ClassIIskeletal malocclusion with Twin-block appliance

PURPOSE To investigate the effect of early correction with Twin-block appliance on soft and hard tissues of patients with Class Ⅱ skeletal malocclusion. METHODS Sixty patients with Angle Class Ⅱ skeletal malocclusion were prospectively selected. The patients were divided into 2 groups, 30 cases in each group, by random number table method. Patients in the experimental group were treated with a Twin-block appliance combined with straight wire appliance, while patients in the control group were treated with a straight wire appliance. The soft and hard tissue indexes(SNA, SNB, ANB, U1-NA angle, U1-NA distance, L1-NB distance, L1-NB angle, U1-L1) before, and 12 months after treatment were measured. Soft tissue measurement indicators included UL-U1, LL-L1, over jet, overbite, E-upper-lip from the upper lip to the E-line, and the lower lip to the E-line, changes in the vertical distance (E-lower-lip), the dip angle of the sulcus, and the thickness of the soft tissue. SPSS 25.0 software package was used for statistical analysis of the data. RESULTS U1-NA, U1-NA, L1-NB, L1-NB, overjet, overbite, E-upper-lip, and E-lower-lip were significantly less than the control group at 12 months and 36 months after treatment in the experimental group(P<0.05). U1-L1, nasolabial angle, sulcus angle, and soft tissue thickness of the experimental group were significantly greater than those of the control group(P<0.05). CONCLUSIONS Twin-block appliance combined with straight wire appliance can significantly improve the relationship between the jaw and the soft and hard tissues of patients with Class Ⅱ skeletal malocclusion, and the long-term effect is good.

Biomechanical influence of anchorages on orthodontic space closing mechanics by sliding method.

This study aims to analyse the stress distributions and initial displacements of teeth during the space closing stage through a three-dimensional finite element method. Computed tomography images of a patient were used to reconstruct the detailed teeth and alveolar bone, and brackets with stainless steel archwire were modelled according to the orthodontic prescriptions. The second premolars and first molars were chosen as the anchorages in the model 6-force, with buccal tubes attached to the second molars in the model 6-force-7, and the second molars as additional anchorages in the model 7-force. The results indicated that a movement of lingual lateral inclination occurred on the incisors during the retraction, and the frictional force between the teeth and the archwire significantly reduced the stress on the teeth and periodontal structures. Graphical abstract Malocclusion is one of the most common issue in dentistry with high prevalence and orthodontic treatment need. The extraction of first premolar teeth was normally needed at the beginning of the treatment. And the straight wire appliance together with the sliding mechanics was used for space closure at the end of the treatment. However, side effects like root resorption also found after the surgery. Biomechanically, the stress distributions and initial displacements of teeth during space closing stage might be a crucial factor contributed to those undesirable side effects. And different selections of anchorages might alter the biomechanical environment during the treatment. Thus, the purpose of the current study was to analyse the stress distributions and initial displacements, with the different anchorage selections, of teeth during space closing stage through 3D finite element method.

Extreme intrusive force affects the expression of c-Fos and matrix metallopeptidase 9 in human dental pulp tissues.

This study aimed to investigate the expression of c-Fos and matrix metallopeptidase 9 (MMP-9) in dental pulp of patients receiving orthodontic treatment via wire appliance.Fifteen patients (30 teeth in total) were randomly assigned to five groups: t = 0, t = 1, t = 4, t = 8 and t = 12 (n = 6). The first maxillary premolars of patients in the t = 0 group were extracted without any orthodontic treatment. An intrusive force of 300 g was applied on first maxillary premolars in the other four groups via wire appliances. This force was maintained for 1 week for t = 1 group, 4 weeks for t = 4 group, 8 weeks for t = 8 group, or 12 weeks for t = 12 group, before the teeth were extracted.The expression of c-Fos and MMP-9 in the pulps of each group was analyzed by immunohistochemical staining and real-time PCR. The relationship in the protein expression between c-Fos and MMP-9 in the dental pulp was analyzed by Pearson correlation analysis.Intrusive force of 300 g increased the expression of both c-Fos and MMP-9 in the dental pulp. The protein expression of MMP-9 in the dental pulp was significantly correlated with the expression of c-Fos (P < .001).Extreme intrusive force upregulates c-Fos and MMP-9 expression in the dental pulp. Moreover, protein expression of c-Fos and MMP-9 is significantly correlated under intrusive force.

Orthodontic Treatment Combined with Miniscrew Anchorage for an Angle Class II Division 1 Case with Severe Crowding and TMDs

The case report describes that the treatment of an Angle Class II and division 1 malocclusion in adult with excessive overjet and high mandibular angle case. The patient has also severe crowding on maxilla and mandible and temporomandibular disorders (TMD). The treatment was performed by use of 0.018×0.025-inch slot straight wire appliances with four first premolars’ extraction. The improvement of excessive overjet was achieved by the proclination of anterior teeth by use of temporary anchorage devices (TADs). After completion of orthodontic treatment, the molar relationships on both sides were almost normalized to Class I and proper overjet and overbite were acquired. Improvement of facial and occlusal problems was acquired. The symptoms of TMDs have been stable due to the continuous care through the treatment period. TADs are considered as a very useful material in terms of the anchorage of molars for the achievement of a large amount of incisor retraction and molar intrusion.

Long-term stability and relapse of deep bite correction:a systematic review

Deep overbite is one of the most common malocclusions and is the most difficult to treat successfully. The real challenge remains the stability of long-term deep overbite correction. A search through the scientific literature revealed only one systematic review on this subject. Given the recent publications on the stability of deep bite correction and the development of new processes designed to avoid relapse of these treatments, this one existing systematic review needs to be updated. The purpose of the present systematic review is to evaluate the long-term stability of deep overbite correction. Electronic databases were searched and nonelectronic journals were manually explored for papers on long-term stability and relapse of deep overbite correction. Articles deemed appropriate for inclusion in this review were selected and analyzed. Their scientific quality was assessed and the data they contained were extracted and summarized. The rate of deep overbite relapse was 47.27%. Patients treated with the straight wire appliance showed a 67.74% relapse rate whereas those treated with the Ricketts biological progressive segmented mechanics appliance displayed a 30.38% rate. Subjects treated towards the end of adolescence presented a 14.3% rate of deep overbite relapse whereas those treated in their early teens or in adulthood had a deep overbite relapse rate of 30% and 30.8%, respectively. Intramuscular injections of botox helped obtain 100% stability in maxillofacial surgery to correct deep bite. Age at initiation of treatment and treatment technique are two factors impacting the long-term stability of deep overbite correction.