The Angle orthodontist最新文献_第9页

Miniscrew anchorage versus Class II elastics for maxillary arch distalization using clear aligners. 使用透明矫治器进行上颌牙弓远端矫治时，微型螺钉锚固与 II 类弹性矫治器的比较。

The Angle orthodontist Pub Date : 2024-07-01 DOI: 10.2319/110723-743.1

Fen Liu, Jian Liu, Mengying Guo, Zhihua Li, Guang Shu, Fanfan Dai

{"title":"Miniscrew anchorage versus Class II elastics for maxillary arch distalization using clear aligners.","authors":"Fen Liu, Jian Liu, Mengying Guo, Zhihua Li, Guang Shu, Fanfan Dai","doi":"10.2319/110723-743.1","DOIUrl":"10.2319/110723-743.1","url":null,"abstract":"Objectives: To identify whether intramaxillary miniscrew anchorage could achieve a better maxillary arch distalization effect in clear aligner treatment compared to Class II elastics.Materials and methods: Thirty adult patients with Class II dentition who were treated with whole maxillary arch distalization using clear aligners were collected. Either intramaxillary miniscrew anchorage (miniscrew group, n = 17) or intermaxillary Class II elastics (Class II elastic group, n = 13) were used to support maxillary arch distalization. Three-dimensional predicted and achieved displacements, and angular changes of maxillary posterior teeth and anterior teeth, were measured and compared.Results: The achieved distalization efficiency was 36.2%-43.9% in the posterior teeth and the retraction efficiency was 36.9%-49.4% in the anterior teeth. No statistically significant differences were found in maxillary arch distalization efficiency between the groups. The miniscrew group achieved less incisor extrusion and posterior tooth distal tipping than the Class II elastic group. Both groups achieved comparable arch expansion, posterior tooth buccal inclination, and anterior tooth lingual inclination.Conclusions: Intramaxillary miniscrew anchorage and intermaxillary Class II elastics achieved comparable efficiency in maxillary arch distalization. However, the miniscrew anchorage showed better vertical control in anterior teeth and mesiodistal tipping control in posterior teeth.","PeriodicalId":94224,"journal":{"name":"The Angle orthodontist","volume":"94 4","pages":"383-391"},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11210513/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142127786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimization of three-dimensional printing parameters for orthodontic applications. 优化正畸应用中的三维打印参数。

The Angle orthodontist Pub Date : 2024-07-01 DOI: 10.2319/102423-722.1

Saro Atam, Cybelle L Pereira, Hammaad R Shah, Wei Hou, Wellington J Rody

{"title":"Optimization of three-dimensional printing parameters for orthodontic applications.","authors":"Saro Atam, Cybelle L Pereira, Hammaad R Shah, Wei Hou, Wellington J Rody","doi":"10.2319/102423-722.1","DOIUrl":"10.2319/102423-722.1","url":null,"abstract":"Objectives: To determine the impact of build orientation, increased layer thickness, and dental crowding on the trueness of three-dimensional (3D)-printed models, and to evaluate how these parameters affect the fit of thermoformed appliances.Materials and methods: Ninety-six dental models were printed horizontally and vertically on the building platform using different 3D-printing technologies: (1) a stereolithography (SLA) printer with layer thicknesses of 160 μm and 300 μm and (2) a digital light processing (DLP) printer with layer thicknesses of 100 μm and 200 μm. Each printed model was digitalized and superimposed on the corresponding source file using 3D rendering software, and deviations were quantified by the root mean square values. Subsequently, a total of 32 thermoformed appliances were fabricated on top of the most accurate 3D-printed models, and their fit was evaluated by digital superimposition and inspection by three blinded orthodontists. Paired t-tests were used to analyze the data.Results: Significant differences (P < .05) between printing technologies used were identified for models printed horizontally, with the SLA system achieving better trueness, especially in crowded dentitions. No significant differences between technology were found when models were printed vertically. The highest values of deviation were recorded in appliances fabricated on top of DLP-printed models. The results of the qualitative evaluation indicated that appliances fabricated on top of SLA models outperformed the DLP-modeled appliances.Conclusions: Three-dimensional printing with increased layer height seems to produce accurate working models for orthodontic applications.","PeriodicalId":94224,"journal":{"name":"The Angle orthodontist","volume":"94 4","pages":"375-382"},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11210519/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142127788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nonsurgical synergistic full-arch vertical intrusion treatment of bimaxillary protruded hyperdivergent skeletal Class II malocclusion using aligners. 使用矫治器对双颌前突超分叉II类错牙合畸形进行非手术协同全牙弓垂直内收治疗。

The Angle orthodontist Pub Date : 2024-07-01 DOI: 10.2319/112923-790.1

Tao Pei, Xueqin Bai

{"title":"Nonsurgical synergistic full-arch vertical intrusion treatment of bimaxillary protruded hyperdivergent skeletal Class II malocclusion using aligners.","authors":"Tao Pei, Xueqin Bai","doi":"10.2319/112923-790.1","DOIUrl":"10.2319/112923-790.1","url":null,"abstract":"A bone-borne full-arch vertical control strategy using miniscrews was deployed with aligners to treat a case of skeletal hyperdivergent Class II malocclusion with bimaxillary protrusion. Miniscrews were inserted in the posterior buccal and palatal regions and the anterior buccal region of the maxilla to distribute vertical intrusive force through the upper arch by anchoring vertical elastics from the miniscrews to the aligners. Synergetic lower anterior intrusion was completed using bilateral posterior miniscrews to counteract the extrusive force generated. Substantial full upper arch and lower anterior vertical intrusion was achieved. In conjunction with en masse anterior-posterior retraction, synergetic posterior and anterior vertical intrusion facilitated counterclockwise rotation of the mandible, creating significant esthetic improvement. Anterior vertical elastics also provided flaring of the anterior teeth, reducing the side effect of lingual tipping from en masse retraction, while successfully controlling overbite and incisor torque during space closure. The bone-borne full-arch vertical intrusion strategy can work well with aligners to address hyperdivergent skeletal Class II malocclusion with bimaxillary protrusion.","PeriodicalId":94224,"journal":{"name":"The Angle orthodontist","volume":"94 4","pages":"462-472"},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11210509/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142127787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reducing the quality of our evidence base by publishing at any cost. 不惜代价出版，降低证据基础的质量。

The Angle orthodontist Pub Date : 2024-05-22 DOI: 10.2319/Editorial_93-4.1

Theodore Eliades, Rolf G Behrents, Steven J Lindauer, David P Rice

引用次数: 0

The second molar dilemma in orthodontics: to bond or not to bond? 正畸中的第二磨牙难题：粘接还是不粘接？

The Angle orthodontist Pub Date : 2024-05-01 DOI: 10.2319/071223-487.1

Fares Alshuraim, Christopher Burns, Darren Morgan, Luay Jabr, Paul Emile Rossouw, Dimitrios Michelogiannakis

{"title":"The second molar dilemma in orthodontics: to bond or not to bond?","authors":"Fares Alshuraim, Christopher Burns, Darren Morgan, Luay Jabr, Paul Emile Rossouw, Dimitrios Michelogiannakis","doi":"10.2319/071223-487.1","DOIUrl":"10.2319/071223-487.1","url":null,"abstract":"Objectives: To compare orthodontic treatment (OT) outcome in adolescents undergoing nonextraction fixed OT with or without bonding of second molars using the score of the American Board of Orthodontics Cast Radiograph Evaluation (C-R-Eval).Materials and methods: This study included healthy adolescents with skeletal Class I or mild Class II/Class III malocclusion, normal or deep overbite (OB), and mild-to-moderate dental crowding (<5 mm) who underwent nonextraction fixed OT with (\"bonded\" group) or without (\"not-bonded\" group) bonding of second molars. Patient treatment records, pre- and posttreatment digital models, lateral cephalograms, and orthopantomograms were assessed. The evaluated outcomes included leveling of the curve of Spee (COS), OB, control of incisor mandibular plane angle (IMPA), number of emergency visits (related to poking wires and/or bracket failure of the terminal molar tubes), treatment duration, and C-R-Eval. Treatment variables were compared across time points and among groups.Results: The sample included 30 patients (mean age 16.07 ± 1.80 years) in the bonded group and 32 patients (mean age 15.69 ± 1.86 years) in the not-bonded group. The mean overall C-R-Eval score was significantly higher (P < .001) in the not-bonded group (25.25 ± 3.98) than in the bonded group (17.70 ± 2.97). There were no significant differences in mean changes of COS, OB, IMPA, or treatment duration among groups. The mean number of emergency visits was significantly higher in the bonded (3.3 ± 0.6) than the not-bonded group (1.9 ± 0.4) (P < .001).Conclusions: Bonding of second molars enhances the outcome of nonextraction fixed OT as demonstrated by the C-R-Eval without increasing treatment duration, irrespective of more emergency visits.","PeriodicalId":94224,"journal":{"name":"The Angle orthodontist","volume":" ","pages":"320-327"},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11050455/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139405741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Content analysis of AI-generated (ChatGPT) responses concerning orthodontic clear aligners. 对人工智能生成的有关正畸透明矫治器的回复（ChatGPT）进行内容分析。

The Angle orthodontist Pub Date : 2024-05-01 DOI: 10.2319/071123-484.1

Sarah Abu Arqub, Dalya Al-Moghrabi, Veerasathpurush Allareddy, Madhur Upadhyay, Nikhilesh Vaid, Sumit Yadav

{"title":"Content analysis of AI-generated (ChatGPT) responses concerning orthodontic clear aligners.","authors":"Sarah Abu Arqub, Dalya Al-Moghrabi, Veerasathpurush Allareddy, Madhur Upadhyay, Nikhilesh Vaid, Sumit Yadav","doi":"10.2319/071123-484.1","DOIUrl":"10.2319/071123-484.1","url":null,"abstract":"Objectives: To assess the accuracy of ChatGPT answers concerning orthodontic clear aligners.Materials and methods: A cross-sectional content analysis of ChatGPT generated responses to queries related to clear aligner treatment (CAT) was undertaken. A total of 111 questions were generated by three orthodontists based on a set of predefined domains and subdomains. The artificial intelligence (AI)-generated (ChatGPT) answers were extracted and their accuracy was determined independently by five orthodontists. The accuracy of answers was assessed using a prepiloted four-point scale scoring rubric. Descriptive statistics were performed.Results: The total mean accuracy score for the entire set was 2.6 ± 1.1. It was noted that 58% of the AI-generated answers were scored as objectively true, 18% were selected facts, 9% were minimal facts, and 15% were false. False claims included the ability of CAT to reduce the need for orthognathic surgery (4.0 ± 0.0), improve airway function (3.8 ± 0.5), achieve root parallelism (3.6 ± 0.5), alleviate sleep apnea (3.8 ± 0.5), and produce more stable results compared to fixed appliances (3.8 ± 0.5).Conclusions: The overall level of accuracy of ChatGPT responses to questions concerning CAT was suboptimal and lacked citations to relevant literature. Ability of the software to offer current and precise information was limited. Therefore, clinicians and patients must be mindful of false claims and relevant facts omitted in the answers generated by ChatGPT.","PeriodicalId":94224,"journal":{"name":"The Angle orthodontist","volume":" ","pages":"263-272"},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11050467/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139405739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Variability associated with maxillary infrazygomatic crest and palatal bone width, height, and angulation in subjects with different vertical facial growth types: a retrospective cone-beam computed tomography study. 面部垂直生长类型不同的受试者上颌骨下颧嵴和腭骨宽度、高度和角度的相关变异性：一项锥形束计算机断层扫描回顾性研究。

The Angle orthodontist Pub Date : 2024-05-01 DOI: 10.2319/062023-430.1

Bhumika Patel, Jessica De Rose, Jansen Nash, Michael Sekula, Carl Gioia, Toru Deguchi, Sudha Gudhimella, Vaibhav Gandhi

{"title":"Variability associated with maxillary infrazygomatic crest and palatal bone width, height, and angulation in subjects with different vertical facial growth types: a retrospective cone-beam computed tomography study.","authors":"Bhumika Patel, Jessica De Rose, Jansen Nash, Michael Sekula, Carl Gioia, Toru Deguchi, Sudha Gudhimella, Vaibhav Gandhi","doi":"10.2319/062023-430.1","DOIUrl":"10.2319/062023-430.1","url":null,"abstract":"Objectives: To assess the infrazygomatic crest (IZC) and palatal bone width, height, and angulation in patients with different vertical facial growth types as potential miniscrew insertion sites.Materials and methods: In this retrospective cone-beam computed tomography study, 162 subjects (81 males and 81 females, mean age 16.05 ± 0.65 years) were included. They were divided into three groups (hypodivergent, normodivergent, and hyperdivergent) based on the Frankfort mandibular plane angle. Ten buccal bone measurements were made at two different coronal sections: maxillary first molar mesiobuccal and distobuccal roots (bilaterally). Six palatal bone measurements were made on a sagittal section at the maxillary central incisors (bilaterally). A total of 32 measurements per subject were considered in the study.Results: No significant difference was observed for the IZC (width and angle) at the maxillary first molar mesiobuccal root. A comparison of normodivergent and hyperdivergent groups for buccal width at the distobuccal root of the first molar showed significant differences. Palatal bone thickness at the level of 2 mm distal to the apex of the central incisor was significantly higher for the hyperdivergent group (10.43 mm) compared with the normodivergent (7.58 mm) and hypodivergent groups (7.83 mm).Conclusions: Hyperdivergent subjects tend to present a longer and deeper IZC and increased palatal bone thickness compared with other groups. The recommended insertion angle for the IZC mini-implant at 3 mm from the alveolar crest should be between 75.5° and 77°.","PeriodicalId":94224,"journal":{"name":"The Angle orthodontist","volume":" ","pages":"313-319"},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11050457/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139405742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An in vitro comparison of the dimensional stability of four 3D-printed models under various storage conditions. 体外比较四种 3D 打印模型在不同储存条件下的尺寸稳定性。

The Angle orthodontist Pub Date : 2024-05-01 DOI: 10.2319/081223-557.1

Vanessa Knode, Björn Ludwig, Sinan Hamadeh, Nikolaos Pandis, Padhraig S Fleming

{"title":"An in vitro comparison of the dimensional stability of four 3D-printed models under various storage conditions.","authors":"Vanessa Knode, Björn Ludwig, Sinan Hamadeh, Nikolaos Pandis, Padhraig S Fleming","doi":"10.2319/081223-557.1","DOIUrl":"https://doi.org/10.2319/081223-557.1","url":null,"abstract":"Objectives: To investigate the dimensional stability of various 3D-printed models derived from resin and plant-based, biodegradable plastics (PLA) under specific storage conditions for a period of up to 21 weeks.Materials and methods: Four different printing materials, including Draft V2, study model 2, and Ortho model OD01 resins as well as PLA mineral, were evaluated over a 21-week period. Eighty 3D-printed models were divided equally into two groups, with one group stored in darkness and the other exposed to daylight. All models were stored at a constant room temperature (20°C). Measurements were taken at 7-week intervals using the Inspect 3D module in OnyxCeph software (Image Instruments GmbH, Chemnitz, Germany).Results: Dimensional change was noted for all of the models with shrinkage of up to 0.26 mm over the study period. Most contraction occured from baseline to T1, although significant further contraction also arose from T1 to T2 (P < .001) and T1 to T3 (P < .001). More shrinkage was observed when exposed to daylight overall and for each resin type (P < .01). The least shrinkage was noted with Ortho model OD01 resin (0.16 mm, SD = 0.06), and the highest level of shrinkage was observed for Draft V2 resin (0.23 mm, SD = 0.06; P < .001).Conclusions: Shrinkage of 3D-printed models is pervasive, arising regardless of the material used (PLA or resin) and being independent of the brand or storage conditions. Consequently, immediate utilization of 3D printing for orthodontic appliance purposes may be preferable, with prolonged storage risking the manufacture of inaccurate orthodontic retainers and appliances.","PeriodicalId":94224,"journal":{"name":"The Angle orthodontist","volume":"94 3","pages":"346-352"},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11050461/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140854804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An evaluation of root resorption associated with the use of photobiomodulation during orthodontic treatment with clear aligners: a retrospective cohort pilot study. 评估透明矫治器正畸治疗过程中使用光生物调节相关的牙根吸收：一项回顾性队列试点研究。

The Angle orthodontist Pub Date : 2024-05-01 DOI: 10.2319/081823-567.1

Antonio Rossi, Manuel Lagravère-Vich, Giseon Heo, Paul W Major, Tarek El-Bialy

{"title":"An evaluation of root resorption associated with the use of photobiomodulation during orthodontic treatment with clear aligners: a retrospective cohort pilot study.","authors":"Antonio Rossi, Manuel Lagravère-Vich, Giseon Heo, Paul W Major, Tarek El-Bialy","doi":"10.2319/081823-567.1","DOIUrl":"10.2319/081823-567.1","url":null,"abstract":"Objectives: To evaluate the change in tooth root volume using cone-beam computed tomography (CBCT) in a group of patients treated concurrently with clear aligners and an adjunctive photobiomodulation (PBM) device.Materials and methods: This retrospective cohort pilot study included the records of 32 consecutively treated clear aligner patients (23 female, 9 male) from the private practice of one orthodontist. The PBM group (n = 16) used the device once per day for 5 minutes per arch and was compared with a matched control group (n = 16). A semiautomated segmentation technique was used to obtain tooth volume of anterior teeth from CBCT imaging prior to (T0) and during or immediately following (T1) orthodontic treatment with clear aligners. The change in root volume between time points was assessed.Results: There was no statistically significant difference between the pre- and posttreatment root volumes of maxillary and mandibular anterior teeth, regardless of which intervention group the patient belonged to (P > .05). There was also no difference in the mean percentage change in root volume between clear aligner patients in this study who were treated with the PBM device compared with a matched control group (P > .05).Conclusions: Clear aligner patients in this study who changed their aligners every 3 to 5 days and used adjunctive photobiomodulation therapy did not experience clinically relevant orthodontically induced external root resorption. Due to the small sample size and measurement error in the root segmentation process, the results should be interpreted with caution.","PeriodicalId":94224,"journal":{"name":"The Angle orthodontist","volume":" ","pages":"294-302"},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11050451/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139984927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Friction and wear behavior of a mechanical oscillating strip system used for interproximal enamel reduction: a quantitative and qualitative scanning electronic microscope evaluation. 用于近端釉质间磨削的机械振荡带系统的摩擦和磨损行为：扫描电子显微镜的定量和定性评估。

The Angle orthodontist Pub Date : 2024-05-01 DOI: 10.2319/083023-590.1

Francesca Gazzani, Denise Bellisario, Laura Fazi, Alessia Balboni, Silvia Licoccia, Chiara Pavoni, Paola Cozza, Roberta Lione

{"title":"Friction and wear behavior of a mechanical oscillating strip system used for interproximal enamel reduction: a quantitative and qualitative scanning electronic microscope evaluation.","authors":"Francesca Gazzani, Denise Bellisario, Laura Fazi, Alessia Balboni, Silvia Licoccia, Chiara Pavoni, Paola Cozza, Roberta Lione","doi":"10.2319/083023-590.1","DOIUrl":"10.2319/083023-590.1","url":null,"abstract":"Objectives: To evaluate wear and friction properties of oscillating strips in order to validate the importance of a standardized interproximal enamel reduction (IPR) sequence to preserve their efficiency and lifetime.Materials and methods: Fifteen complete oscillating IPR sequences were tested by means of tribological tests (Linear Reciprocating Tribometer, C.S.M. Instruments, Peseaux, Switzerland). Fifteen single 0.2-mm metallic strips underwent a long continuous cycle of 240 minutes. Strip surface roughness and waviness measurements were assessed by means of a contact probe surface profiler (TalySurf CLI 2000; Taylor Hobson, Leicester, UK) and TayMap software. Statistical analysis was performed with independent-samples t-test. Significance was at the P < .05 level. Scanning electronic microscopy analysis of strip surfaces was conducted with an FEI Quanta 200 (Hillsboro, Ore) in high vacuum at 30.00 kV.Results: Resin strips revealed a significant reduction in surface roughness (Ra, Rt, RDq) and a significant increase in waviness parameters (Wa, Wt). Rt and RDq values significantly decreased upon use of the metallic strips. Significantly higher values of Wa (+ 2.84 µm) and Wt (+0.1 µm) were observed only for the 0.2-mm metallic strips. Higher friction values were observed when the metallic strips were tested singularly rather than within the entire sequence. Lower Ra and Rt values were revealed when 0.2-mm metallic strips were tested up to 240 minutes.Conclusions: The application of a standardized oscillating sequence allows for more efficient wear performance of the strips with a significant impact on their abrasive power and lifetime.","PeriodicalId":94224,"journal":{"name":"The Angle orthodontist","volume":" ","pages":"336-345"},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11050454/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139992193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0