-
Journal of Endodontics Jul 1998The effect of the application of a matrix band and the use of cavity varnish on the microleakage of Cavit in endodontic access preparations was investigated. Sixty human...
The effect of the application of a matrix band and the use of cavity varnish on the microleakage of Cavit in endodontic access preparations was investigated. Sixty human upper premolars were divided into six groups of ten specimens each. Access cavities with proximal extensions were prepared and filled with 1, Cavit only; 2, Cavit after application of varnish; 3, Cavit with the use of a matrix band; 4, Cavit with a matrix band and varnish; 5, incremental deposition of Cavit with the use of a matrix band and varnish; and 6, gutta percha stopping. The specimens were placed in 2% methylene blue dye, thermocycled, and evaluated for both proximal and occlusal linear leakage. The experimental group in which Cavit was incrementally deposited in varnish-lined and matrix-supported cavities exhibited significantly (p < 0.05) less proximal microleakage than those groups in which cavities were filled without the application of both a matrix band and a cavity varnish.
Topics: Bicuspid; Calcium Sulfate; Dental Cavity Lining; Dental Cements; Dental Leakage; Dental Materials; Drug Combinations; Humans; Matrix Bands; Paint; Polyvinyls; Resins, Plant; Root Canal Filling Materials; Root Canal Obturation; Statistics, Nonparametric; Zinc Oxide
PubMed: 9693571
DOI: 10.1016/S0099-2399(98)80047-2 -
General Dentistry 2009This study sought to evaluate how the matrix and insertion technique affected microleakage and microhardness of posterior composite restorations. Class II preparations... (Comparative Study)
Comparative Study
This study sought to evaluate how the matrix and insertion technique affected microleakage and microhardness of posterior composite restorations. Class II preparations with the gingival margin in cementum were performed in 60 bovine teeth and divided into two groups: transparent matrix and reflective wedge (Group T) (n=20) and metallic matrix and wood wedge (Group M) (n=40). Cavities were restored and specimens were isolated with nail varnish, immersed in 0.2% Rhodamine B, and sectioned. Microleakage was evaluated under magnification (20x) and data were analyzed with one-way ANOVA. Microhardness was assessed at 1, 2, and 3 mm from the gingival wall and data were analyzed with two-way ANOVA. No significant difference was observed in terms of leakage. Significant differences were observed in terms of hardness for both factors, although no interaction was noted. It was concluded that the insertion technique had no influence on microleakage and that using a metallic matrix with oblique increments provided the highest hardness. There was no correlation between these two variables.
Topics: Acid Etching, Dental; Animals; Cattle; Composite Resins; Dental Cavity Preparation; Dental Cementum; Dental Leakage; Dental Materials; Dental Restoration, Permanent; Equipment Design; Fluorescent Dyes; Hardness; Matrix Bands; Polymethacrylic Acids; Random Allocation; Resin Cements; Rhodamines; Surface Properties; Temperature; Time Factors; Water
PubMed: 19552367
DOI: No ID Found -
The Journal of Prosthetic Dentistry Feb 1987Conventional matrix bands are inappropriate for restoring extensively damaged teeth because of inadequate contact areas, inconsistent gingival margins, and undefined...
Conventional matrix bands are inappropriate for restoring extensively damaged teeth because of inadequate contact areas, inconsistent gingival margins, and undefined occlusal relationships. An extraoral matrix can be fabricated before intraoral reconstruction of the tooth.
Topics: Dental Instruments; Dental Restoration, Permanent; Humans; Matrix Bands; Tooth Fractures
PubMed: 3470507
DOI: 10.1016/0022-3913(87)90136-3 -
Journal of Esthetic and Restorative... 2008
Topics: Bicuspid; Composite Resins; Dental Cavity Lining; Dental Marginal Adaptation; Dental Restoration Failure; Dental Restoration Wear; Dental Restoration, Permanent; Dentin Sensitivity; Humans; Matrix Bands; Molar
PubMed: 18237342
DOI: 10.1111/j.1708-8240.2008.00150.x -
Journal - Oklahoma Dental Association 1981
Topics: Copper; Dental Instruments; Equipment Design; Matrix Bands
PubMed: 6948928
DOI: No ID Found -
The Journal of Chemical Physics Apr 2017Line shape parameters including the half-widths and the off-diagonal elements of the relaxation matrix have been calculated for self-broadened NH lines in the...
Line shape parameters including the half-widths and the off-diagonal elements of the relaxation matrix have been calculated for self-broadened NH lines in the perpendicular ν band. As in the pure rotational and the parallel ν bands, the small inversion splitting in this band causes a complete failure of the isolated line approximation. As a result, one has to use formalisms not relying on this approximation. However, due to differences between parallel and perpendicular bands of NH, the applicability of the formalism used in our previous studies of the ν band and other parallel bands must be carefully verified. We have found that, as long as potential models only contain components with K = K = 0, whose matrix elements require the selection rule Δk = 0, the formalism is applicable for the ν band with some minor adjustments. Based on both theoretical considerations and results from numerical calculations, the non-diagonality of the relaxation matrices in all the P, P, Q, Q, R, and R branches is discussed. Theoretically calculated self-broadened half-widths are compared with measurements and the values listed in HITRAN 2012. With respect to line coupling effects, we have compared our calculated intra-doublet off-diagonal elements of the relaxation matrix with reliable measurements carried out in the P branch where the spectral environment is favorable. The agreement is rather good since our results do well reproduce the observed k and j dependences of these elements, thus validating our formalism.
PubMed: 28390348
DOI: 10.1063/1.4979492 -
Quintessenz Journal Oct 1982
Topics: Dental Instruments; Dentistry, Operative; Matrix Bands
PubMed: 6964410
DOI: No ID Found -
Revue Belge de Medecine Dentaire.... 1975
Topics: Dental Amalgam; Dental Materials; Dental Restoration, Permanent; Humans; Matrix Bands
PubMed: 1061211
DOI: No ID Found -
Annals of Plastic Surgery Jan 2006Thirteen breast reconstructions in 11 patients, averaging 58 years of age, underwent mastectomies. The technique uses a saline implant either totally or partially...
Thirteen breast reconstructions in 11 patients, averaging 58 years of age, underwent mastectomies. The technique uses a saline implant either totally or partially covered with a human acellular dermal matrix. The mean postoperative follow-up time was 14 months. Ninety percent of the patients were considered high risk; the thickness of the human acellular dermal matrix was an average of 1.3 mm, with an average area per breast of 121 cm. There were 12 successful breast reconstructions (92%) that provided stability, increased soft tissue padding, which allowed a greater resemblance to normal breast shape and decreased rippling and implant visibility. The graft was used in an onlay fashion or as an extension of the pectoralis major muscle that covers the implant. A representative histologic cross-section of well-integrated human acellular dermal matrix is presented. The use of a human acellular dermal matrix in breast reconstruction is an alternative protocol in high-risk patients, resulting in a minimal increase in operative time and a decrease in morbidity compared with more extensive procedures.
Topics: Adult; Aged; Breast Implantation; Collagen; Female; Humans; Matrix Bands; Middle Aged; Pectoralis Muscles; Plastic Surgery Procedures
PubMed: 16374090
DOI: 10.1097/01.sap.0000185460.31188.c1 -
The Journal of Prosthetic Dentistry Jul 2010
Topics: Crowns; Dental Amalgam; Dental Bonding; Dental Cements; Dental Prosthesis Design; Dental Restoration, Temporary; Humans; Matrix Bands; Post and Core Technique; Tooth Preparation
PubMed: 20620368
DOI: 10.1016/S0022-3913(10)60091-1