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Sensors (Basel, Switzerland) May 2023Hyperspectral band selection plays an important role in overcoming the curse of dimensionality. Recently, clustering-based band selection methods have shown promise in...
Hyperspectral band selection plays an important role in overcoming the curse of dimensionality. Recently, clustering-based band selection methods have shown promise in the selection of informative and representative bands from hyperspectral images (HSIs). However, most existing clustering-based band selection methods involve the clustering of original HSIs, limiting their performance because of the high dimensionality of hyperspectral bands. To tackle this problem, a novel hyperspectral band selection method termed joint learning of correlation-constrained fuzzy clustering and discriminative non-negative representation for hyperspectral band selection (CFNR) is presented. In CFNR, graph regularized non-negative matrix factorization (GNMF) and constrained fuzzy C-means (FCM) are integrated into a unified model to perform clustering on the learned feature representation of bands rather than on the original high-dimensional data. Specifically, the proposed CFNR aims to learn the discriminative non-negative representation of each band for clustering by introducing GNMF into the model of the constrained FCM and making full use of the intrinsic manifold structure of HSIs. Moreover, based on the band correlation property of HSIs, a correlation constraint, which enforces the similarity of clustering results between neighboring bands, is imposed on the membership matrix of FCM in the CFNR model to obtain clustering results that meet the needs of band selection. The alternating direction multiplier method is adopted to solve the joint optimization model. Compared with existing methods, CFNR can obtain a more informative and representative band subset, thus can improve the reliability of hyperspectral image classifications. Experimental results on five real hyperspectral datasets demonstrate that CFNR can achieve superior performance compared with several state-of-the-art methods.
PubMed: 37430753
DOI: 10.3390/s23104838 -
Operative Dentistry 2007
Topics: Dental Restoration, Permanent; Humans; Matrix Bands
PubMed: 17695616
DOI: 10.2341/06-150 -
British Dental Journal Sep 2008
Topics: Dental Amalgam; Dental Restoration, Permanent; Humans; Matrix Bands
PubMed: 18791562
DOI: 10.1038/sj.bdj.2008.744 -
International Journal of Clinical... 2021Proximal contacts and their interdigitation through occlusal contact with opposing teeth play a major role in children, for the eruption of permanent teeth into normal...
AIMS AND OBJECTIVES
Proximal contacts and their interdigitation through occlusal contact with opposing teeth play a major role in children, for the eruption of permanent teeth into normal position. Determining the ideal matrix band system for proximal restorations helps in the construction of contacts and contours. This study is designed to determine the most suitable matrix band system for proximal restorations.
MATERIALS AND METHODS
A total of 96 proximal cavities were selected among patients aged 5-9 years and were equally divided into three groups. Group I: T-band, group II: ProMatrix, and group III: FenderMate. Pre- and postoperative radiographs were taken to evaluate carious lesions and restorations. Class II cavity was prepared and glass ionomer restorations were done using matrix systems. The efficacy of matrix bands was evaluated through the operator's questionnaire and postoperative radiographs.
RESULTS
No statistical significance was found between the three matrix bands but FenderMate showed few clinical drawbacks that were statistically significant ( < 0.005).
INTERPRETATION AND CONCLUSION
Matrix systems used in this study showed good results in restoring proximal contacts and contours. FenderMate showed few drawbacks when compared with the other two matrix systems. None of the matrix systems used in the present study were able to create 100% accurate proximal contacts and contours.
HOW TO CITE THIS ARTICLE
Dindukurthi MK, Setty JV, Srinivasan I, Restoration of Proximal Contacts in Decayed Primary Molars Using Three Different Matrix Systems in Children Aged 5-9 Years: An Study. Int J Clin Pediatr Dent 2021;14(1):70-74.
PubMed: 34326587
DOI: 10.5005/jp-journals-10005-1929 -
Operative Dentistry 2006The preparation of an individualized wedge in the gingival embrasure before cavity preparation using photo-cured resin permits rehabilitation of the interproximal space...
The preparation of an individualized wedge in the gingival embrasure before cavity preparation using photo-cured resin permits rehabilitation of the interproximal space and the original contact point position. Because the individualized wedge completely fills the embrasure, the adaptation to the gingival and proximal walls of the molar to be restored is perfect, avoiding any overextension of obturation material during insertion. Furthermore, the original position of the contact point is preserved.
Topics: Composite Resins; Dental Cavity Preparation; Dental Enamel; Dental Restoration, Permanent; Dentin; Equipment Design; Humans; Matrix Bands; Resins, Synthetic; Rubber Dams; Surface Properties
PubMed: 16802649
DOI: 10.2341/05-58 -
Journal of the American Dental... Feb 2006The authors present a technique for placing and reinforcing an amalgam matrix around combined Class II and Class V preparations that connect at the proximal box.
BACKGROUND
The authors present a technique for placing and reinforcing an amalgam matrix around combined Class II and Class V preparations that connect at the proximal box.
OVERVIEW
First, the dentist fills the Class V aspect of the preparation, using a temporary resin-based composite wall at the line angle to support amalgam condensation. The dentist then removes the wall and places a matrix band around the tooth, internally reinforcing the band with smaller pieces of matrix band and resin-saturated cotton balls that are light-polymerized and externally reinforcing the band with fast-polymerizing vinyl polysiloxane. Finally, the dentist condenses the line angle amalgam through the proximal box and condenses the proximal box and occlusal aspects.
CONCLUSION
For connected Class II and Class V preparations, this matrix technique permits controlled amalgam condensation, even at the line angle aspect, where it is difficult to condense amalgam without voids or microleakage.
CLINICAL IMPLICATIONS
This technique allows dentists to provide a stable, inexpensive direct restoration for teeth with connected Class II and Class V preparations, providing an alternative for patients who do not wish to have crowns placed.
Topics: Composite Resins; Cotton Fiber; Dental Amalgam; Dental Cavity Preparation; Dental Materials; Dental Restoration, Permanent; Equipment Design; Humans; Matrix Bands; Polyvinyls; Siloxanes
PubMed: 16521384
DOI: 10.14219/jada.archive.2006.0143 -
The Journal of Prosthetic Dentistry Feb 1986The various methods to accomplish gingival displacement have been described. The techniques have been noted and their relative advantages and disadvantages summarized.... (Review)
Review
The various methods to accomplish gingival displacement have been described. The techniques have been noted and their relative advantages and disadvantages summarized. The practicing dentist can use this review to make better informed decisions regarding the method he or she chooses for the treatment of a particular patient.
Topics: Crowns; Curettage; Dental Impression Technique; Denture, Partial, Fixed; Electrosurgery; Epinephrine; Gingiva; Humans; Matrix Bands
PubMed: 3514852
DOI: 10.1016/0022-3913(86)90336-7 -
General Dentistry 1999A method is proposed of making amalgam build-ups for coronally debilitated teeth through the use of a stable matrix consisting of a disposable tray and polyvinylsiloxane...
A method is proposed of making amalgam build-ups for coronally debilitated teeth through the use of a stable matrix consisting of a disposable tray and polyvinylsiloxane occlusal registration material. For teeth with minimal remaining coronal tooth structure and/or the absence of adjacent teeth, this technique provides proper stabilization of the matrix band to permit adequate condensation of amalgam.
Topics: Dental Amalgam; Dental Impression Materials; Dental Impression Technique; Dental Restoration, Permanent; Humans; Matrix Bands; Polyvinyls; Siloxanes
PubMed: 10687468
DOI: No ID Found -
British Dental Journal Jan 2002The aims of this study were to determine the pattern of use and re-use of matrix bands in general practice in Scotland, to demonstrate which type of matrix band is most...
AIMS
The aims of this study were to determine the pattern of use and re-use of matrix bands in general practice in Scotland, to demonstrate which type of matrix band is most commonly used and to examine infection control measures of relevance to the safe use and re-use of matrix bands.
SUBJECTS
621 of Scotland's 1,849 general dental practitioners were randomly selected.
DATA COLLECTION
A 19-item self-reported questionnaire was mailed in June 1999 with a follow-up mailing sent in August 1999.
ANALYSIS
Data analysis involved descriptive statistics and cross-tabulation. Where appropriate, differences between categories were tested for significance by a Chi-square test.
RESULTS
A total of 479 questionnaires were returned, representing a response rate of 77%. Reported compliance with routine glove wearing was high (91%). Most dentists (92%) provided training on instrument cleaning and sterilisation for their dental nurses. Ultrasonic baths were used by 59% of practitioners; the remainder soaked or manually scrubbed instruments to remove debris before autoclaving. The Siqveland matrix was the matrix of choice for 96% of respondents. 7% provided a new matrix band for each patient. Most (64%) changed bands only when they were bent or damaged; 29% changed them daily or weekly. Deterrents to use of a new band for each patient were cost (39%) and time (52%). A total of 54% of respondents considered matrix band replacement unnecessary between patients.
CONCLUSIONS
The Siqveland matrix band is the most popular among the study group of dental practitioners. Re-use of matrix bands is common. Guidelines for the safe re-use of matrix bands are required.
Topics: Attitude of Health Personnel; Chi-Square Distribution; Dental Assistants; Dentists; Disinfection; Equipment Contamination; Equipment Reuse; Equipment Safety; Female; General Practice, Dental; Gloves, Surgical; Humans; Infection Control, Dental; Inservice Training; Male; Matrix Bands; Scotland; Sterilization; Surveys and Questionnaires
PubMed: 11852897
DOI: 10.1038/sj.bdj.4801286 -
The Journal of Prosthetic Dentistry Feb 1998This article describes the instrumentation, materials, and clinical procedures for the matrix impression system. The matrix impression system uses a custom matrix to...
This article describes the instrumentation, materials, and clinical procedures for the matrix impression system. The matrix impression system uses a custom matrix to control the sulcular environment and to deliver impression material to the subgingival parts to be impressed. It describes the four types of forces involved in gingival displacement during impressions, effective delivery of impression material with simultaneous sulcular cleansing, and simplification of complex impressions with or without segmentation. The application of the matrix impression system is described for making routine impressions and for some atypical problems. The article also provides a detailed description of the formation and design of the matrix.
Topics: Dental Impression Materials; Dental Impression Technique; Dental Stress Analysis; Denture, Partial, Fixed; Elasticity; Equipment Design; Ethers; Gingiva; Humans; Matrix Bands; Polyvinyls; Rubber; Siloxanes; Stress, Mechanical; Viscosity
PubMed: 9513108
DOI: 10.1016/s0022-3913(98)70217-3