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Lai WL. [Clear aligner in orthodontic retreatment]. Zhonghua Kou Qiang Yi Xue Za Zhi 2024; 59:400-406. [PMID: 38548599 DOI: 10.3760/cma.j.cn112144-20240109-00017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/13/2024]
Abstract
Improper diagnosis and design, misusing orthodontic technique, relapse after orthodontic treatment, and poor patient compliance may lead to treatment failure, requiring orthodontic retreatment. While in such cases, patients usually have already had their teeth extracted, or are with periodontal, joint, and other dental problems, which often require multidisciplinary treatment. The retreatment of orthodontic patients is difficult, and the treatment options are limited. The characteristics of clear aligner treatment, such as comfortable and beautiful appearance, high degree of digital precision, and personalized tooth arrangement to simulate the final outcome, make it popular in the orthodontic retreatment. This article discusses and summarizes the details of orthodontic design, case monitoring, and the application of clear aligner in orthodontic retreatment of failed cases. Before starting treatment, the difficulty assessment tool (clear aligner treatment complexity assessment tool) can be used to evaluate the difficulty of clear aligner treatment. Orthodontists are recommended to treat orthodontic patients with clear aligners within their ability to avoid treatment failure. The key to the success of the extraction case treatment with clear aligner is to make the correct diagnosis and select the right cases. In the treatment planning, attention should be paid to the restoration of anterior tooth torque, making good use of molar distalization to obtain the space, vertical control, and improving posterior tooth relationship. Proper selection of cases and reasonable design in clear aligner treatment are expected to obtain tooth alignment, good intercuspation, normal overbite and overjet, periodontal health, parallel roots, and to achieve the goal of aesthetic, functional, stable, and healthy orthodontic treatment.
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Affiliation(s)
- W L Lai
- Department of Orthodontics, West China Hospital of Stomatology, Sichuan University & State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases, Chengdu 610041, China
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Lai WL, Saeedipour H, Goh KL. Dataset on mechanical properties of damaged fibre composite laminates with drilled vent-holes for resin-injection repair procedure. Data Brief 2019; 24:103912. [PMID: 31061858 PMCID: PMC6488824 DOI: 10.1016/j.dib.2019.103912] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2019] [Revised: 03/31/2019] [Accepted: 04/03/2019] [Indexed: 10/27/2022] Open
Abstract
This dataset comprises the mechanical properties of pristine and barely visible impact damaged (BVID) carbon fibre reinforced epoxy composite (CFRP) laminates. The mechanical dataset describes the compressive strength, compressive strain at fracture, strain energy density for resilience and strain energy density to fracture of the CFRP laminates with different number of vent holes (namely 4, 5 and 6) in the respective pristine and BVID states. The vent holes were created in the laminate to facilitate the resin-injection repair process. The mechanical properties were determined from in-plane compression test of the CFRP laminates. Structure-related dataset, namely infrared thermographs and ultrasonic C-scan images of BVID and other damage features induced by mechanical drilling, are included for completeness.
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Affiliation(s)
- W L Lai
- Newcastle Research & Innovation Institute (NewRIIS), 80 Jurong East Street 21, #05-04, 609607 Singapore.,Newcastle University, Faculty of Science, Agriculture and Engineering, Newcastle Upon Tyne, NE1 7RU, UK
| | - H Saeedipour
- Republic Polytechnic, School of Engineering, Singapore
| | - K L Goh
- Newcastle Research & Innovation Institute (NewRIIS), 80 Jurong East Street 21, #05-04, 609607 Singapore.,Newcastle University, Faculty of Science, Agriculture and Engineering, Newcastle Upon Tyne, NE1 7RU, UK
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Lai WL, Hung WY, Ching YP. The tumor suppressor, TAX1BP2, is a novel substrate of ATM kinase. Oncogene 2013; 33:5303-9. [PMID: 24240686 DOI: 10.1038/onc.2013.481] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2013] [Revised: 10/04/2013] [Accepted: 10/08/2013] [Indexed: 12/27/2022]
Abstract
DNA damage repair response is a crucial process for cancer prevention. One of the key regulators of this process is ataxia telangiectasia mutated (ATM) kinase, which modulates the p53 level by direct and indirect phosphorylation. Recent data showed that ATM also localizes at the centrosome, but the function remains elusive. TAX1BP2 was initially identified as a novel centrosomal protein that interacts directly with the human T-cell leukemia virus type 1 (HTLV-1)-encoded oncoprotein, Tax, and inhibits centrosome overduplication. Subsequently, TAX1BP2 was found to be a tumor suppressor in hepatocellular carcinoma, and accumulation of TAX1BP2 was observed upon chemotherapeutic drug treatment. Here, we provide evidence that TAX1BP2 is a direct phosphorylation substrate of ATM. The protein level of TAX1BP2 is significantly upregulated in response to DNA damaging agents. Serine-922 of TAX1BP2 is the phosphorylation site of ATM, and such phosphorylation modulates the protein stability, ubiquitination and tumor suppressor activity of TAX1BP2. Taken together, we demonstrate for the first time that TAX1BP2 is a novel effector of ATM in DNA damage response and delineated a new mechanism by which ATM stabilizes the tumor suppressor TAX1BP2.
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Affiliation(s)
- W L Lai
- Department of Anatomy, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - W Y Hung
- Department of Anatomy, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Y P Ching
- 1] Department of Anatomy, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China [2] State Key Laboratory for Liver Research, The University of Hong Kong, Hong Kong, China [3] State Key Laboratory of Brain and Cognitive Sciences, The University of Hong Kong, Hong Kong, China
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Wang J, Jian F, Chen J, Ye NS, Huang YH, Wang S, Huang RH, Pei J, Liu P, Zhang L, Zhao ZH, Chen QM, Lai WL, Lin YF. Cognitive behavioral therapy for orthodontic pain control: a randomized trial. J Dent Res 2012; 91:580-5. [PMID: 22492277 DOI: 10.1177/0022034512444446] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The objective of this study was to evaluate the efficacy of cognitive behavioral therapy intervention for patients who experienced pain during orthodontic treatment. The baseline characteristics were assessed via questionnaires and oral examinations. Four hundred and fifty eligible individuals were recruited and randomized by computer-generated block randomization into three groups: cognitive behavioral therapy intervention (n = 150), ibuprofen intervention (n = 150), and no intervention (control; n = 150). Primary outcomes were the change from baseline in pain intensity measured with 100-mm Visual Analog Scale (VAS) scores at 1, 2, 3, 7, 14, and 30 days after initial archwire placement. Outcomes assessment was blinded and followed the intention-to-treat principle. One hundred forty-three (95.30%), 145 (96.70%), and 141 (94.00%) individuals in the cognitive behavioral therapy, the ibuprofen, and the control groups, respectively, completed the one-month follow-up evaluations. Those in the cognitive behavioral therapy group showed a greater decrease in mean VAS scores than did those in the control group over the previous five time-points (p < 0.001). Cognitive behavioral therapy was shown to be effective in pain control during the initial stage of orthodontic treatment. The study registration number was ChiCTR-TRC-00000556.
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Affiliation(s)
- J Wang
- State Key Laboratory of Oral Diseases, West China School of Stomatology, Sichuan University, Chengdu, P.R. China
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Chen H, Lee WJ, Huang HY, Chiu CM, Tsai YF, Tseng TF, Lu JT, Lai WL, Sun CK. Performance of THz fiber-scanning near-field microscopy to diagnose breast tumors. Opt Express 2011; 19:19523-19531. [PMID: 21996893 DOI: 10.1364/oe.19.019523] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Based on tissues from 20 female patients (mean age: 53 years; rang: 36-72 years), we examine the performance of a room-temperature-operated terahertz (THz) fiber-scanning near-field microscopy to diagnose slices of breast tissues. The specimens were frozen sliced and then measured in a thawed state without dehydration. We performed the imaging at 320 GHz. Our study indicates that images acquired in the THz transmission-illumination mode can all clearly distinguish breast tumor tissues from normal tissues without H&E staining. Due to its capability to perform quantitative analysis and to allow follow-up staining and traditional pathohistological analysis, our study indicates great potential of the THz fiber-scanning near-field microscopy for future automation, which is critical for fast and complete pre-screening on breast tumor pathological examinations and for assisting quick definition of the tumor margins during the surgical procedure such as breast-conserving surgery.
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Affiliation(s)
- Hua Chen
- Department of Electrical Engineering and Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei, 10617, Taiwan
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Sun J, Yu YC, Liu MY, Chen L, Li HW, Zhang L, Zhou Y, Ao D, Tao R, Lai WL. Survival time comparison between Hawley and clear overlay retainers: a randomized trial. J Dent Res 2011; 90:1197-201. [PMID: 21771797 DOI: 10.1177/0022034511415274] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
The objectives of this study were to compare the survival time of the Hawley retainer (HR) and the clear overlay retainer (COR) over one-year follow-up and to analyze risk factors contributing to their breakage. In this randomized, controlled clinical trial, we assigned 120 adolescent patients to receive either the HR or the COR. All specific data on breakage dates, the reasons for breakage, and the broken parts of the retainers were recorded. A survival analysis was used to describe retainer survival over time. No significant differences were observed in survival times between the 2 groups for either the maxillary retainer (p = 0.254) or the mandibular retainer (p = 0.188). Both retainers tended to fracture, but the fracture locations were different. The findings indicate that clinicians should avoid increasing buccal root torque and reinforce the retainer base plates. Breakage rates may not influence the choice of retainer (Trial Registration number is ChiCTR-TRC-00000055).
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Affiliation(s)
- J Sun
- Department of Orthodontics, State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, People's Republic of China
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Lai WL, Chen JJ, Chung CY, Lee CG, Liao SW. The influence of lagoon on neighboring rivers by water and sediment quality. Water Sci Technol 2010; 61:2477-2489. [PMID: 20453320 DOI: 10.2166/wst.2010.840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Canonical discriminant analysis (CDA) was applied in order to distinguish the water-quality and the sediment-quality parameters from neighboring rivers, and to recognize similarities of water and sediment properties between a lagoon and neighboring rivers. Two set of constructed discriminant functions showed a marked contribution to most of the discriminant variables. In water, the significant parameters - the total nitrogen, algae, dissolved oxygen and total phosphate - were combined as the nutrient effect factor. The recognition capacities of the two discriminant functions were 95.6 and 4.4%, respectively; the Kaoping River showed the most similarities with the water quality in Dapeng Bay; in sediment, the significant parameters porosity, Cd, Cr, Al, and Pb were combined as the heavy metal effect factor. The recognition capacities were 82.6 and 17.4%, respectively, but the sediment properties in these three rivers had no significant similarity with the Dapeng Bay.
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Affiliation(s)
- W L Lai
- Department of Environmental Resources Management, Tajen University, Pingtung, Taiwan, China
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Kou SC, Lee G, Poon CS, Lai WL. Properties of lightweight aggregate concrete prepared with PVC granules derived from scraped PVC pipes. Waste Manag 2009; 29:621-628. [PMID: 18691863 DOI: 10.1016/j.wasman.2008.06.014] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2007] [Revised: 04/10/2008] [Accepted: 06/11/2008] [Indexed: 05/26/2023]
Abstract
This paper aims to investigate the fresh and hardened properties of lightweight aggregate concretes that are prepared with the use of recycled plastic waste sourced from scraped PVC pipes to replace river sand as fine aggregates. A number of laboratory prepared concrete mixes were tested, in which river sand was partially replaced by PVC plastic waste granules in percentages of 0%, 5%, 15%, 30% and 45% by volume. Two major findings are identified. The positive side shows that the concrete prepared with a partial replacement by PVC was lighter (lower density), was more ductile (greater Poisson's ratios and reduced modulus of elasticity), and had lower drying shrinkage and higher resistance to chloride ion penetration. The negative side reveals that the workability, compressive strength and tensile splitting strength of the concretes were reduced. The results gathered would form a part of useful information for recycling PVC plastic waste in lightweight concrete mixes.
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Affiliation(s)
- S C Kou
- Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong
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Yang SH, Chen YJ, Tung PY, Lai WL, Chen Y, Jeng CJ, Wang SM. Anti-Thy-1 antibody-induced neurite outgrowth in cultured dorsal root ganglionic neurons is mediated by the c-Src-MEK signaling pathway. J Cell Biochem 2007; 103:67-77. [PMID: 17486586 DOI: 10.1002/jcb.21387] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Our previous study has shown that anti-Thy-1 antibody promotes neurite outgrowth of cultured dorsal root ganglion (DRG) neurons in a protein kinase A (PKA)-dependent manner. The present study provided another intracellular signaling pathway for the neurotrophic effect of anti-Thy-1 antibody. In DMSO-treated control cells, Thy-1 was enriched in microdomain-like structures on cell membranes by immunofluorescence observation. Treatment of DRG neurons with anti-Thy-1 antibody not only stimulated neurite outgrowth, but also increased the branching complexity of the neurites in both small and large neurons. We have previously shown that anti-Thy-1 antibody causes a time-dependent activation of mitogen-activated protein kinase (MEK) and of cyclic AMP response-element binding protein (CREB). Here, anti-Thy-1 antibody elicited a transient activation of c-Src kinase, and the activation of c-Src kinase appeared occurring upstream of the activation of MEK and CREB, since pretreatment with the Src kinase inhibitor, PP2, effectively abolished the anti-Thy-1 antibody-induced neurite outgrowth and the phosphorylation of MEK and CREB. CREB phosphorylation might result in upregulation of certain neurite outgrowth-related proteins. We therefore conclude that anti-Thy-1 antibody activates the c-Src kinase-MEK-CREB cascade and overcomes the inhibitory effect of Thy-1 on neurite outgrowth in DRG neurons.
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Affiliation(s)
- Shih-Hung Yang
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei 10051, Taiwan
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