21 research outputs found
Defect Structure Versus Superconductivity in MeB2 Compounds (Me = Refractory Metals) and One-Dimensional Superconductors
Update On Nonsurgical, Ultraconservative Approaches To Treat Effectively Non-cavitated Caries Lesions In Permanent Teeth
Dental caries on tooth surfaces is still a problem in many industrialized countries. For many years, dentistry was influenced by a mechanical approach characterized by the use of high-speed rotary cutting instruments, and dentists predominantly used surgical methods to address caries. This included radical removal of diseased portions of the tooth, along with material-driven geometric extensions to areas that were assumed to be caries-resistant. This concept of extension for prevention was introduced by G. V. Black and influenced dentists for more than 120 years. Recently, a new paradigm of operative conservatism, sometimes referred to as "minimally invasive dentistry," has gained popularity. This paradigm is designed to promote maximum preservation of healthy dental structures over a lifetime. The aim of this review is to discuss the efficacy of current nonsurgical treatments for non-cavitated caries lesions in permanent teeth. Based on results obtained from clinical trials, this review evaluates treatments such as consumption of CPP-ACP added gums, resin infiltration and fissure sealing. Although in a few cases an invasive approach is needed to arrest caries progression, the non-surgical approach generally provides potential benefits that include conserving structure by delaying intervention or minimizing the operative procedure. All current non-invasive methods are effective in treating non-cavitated caries lesions. The adoption of non-invasive approaches in the management of these lesions can preserve dental tissues, thus increasing tooth longevity.52229236Bader, J.D., Shugars, D.A., The evidence supporting alternative management strategies for early occlusal caries and suspected occlusal dentinal caries (2006) J Evid Base Dent Pract, 6, pp. 91-100Beauchamp, J., Caufield, P.W., Crall, J.J., Evidence-based clinical recommendations for the use of pit-and-fissure sealants: a report of the America Dental Association council on scientific affairs (2009) Dent Clin N Am, 53, pp. 131-147Paris, S., Meyer-Lueckel, H., Kielbassa, A.M., Resin infiltration of natural caries lesions (2007) J Dent Res, 86, pp. 662-666Morgan, M.V., Adams, G.G., Bailey, D.L., The anticariogenic effect of sugar-free gum containing CPP-ACP nanocomplexes on approximal caries determined using digital bitewing radiography (2008) Caries Res, 42, pp. 171-184Kuisch, V.K., Dental caries: a new look at an old disease (2009) Inside Dent, 5, pp. 60-65Feacherstone, J.D., Dental caries: a dynamic disease process (2008) Aust Dent J, 53, pp. 286-291Diefenderfer, K.E., Stahl, J., Caries remineralization therapy: implications for dental readiness (2008) Mil Med, 173, pp. 48-50Maltz, M., Jardim, J.J., Alves, L.R., Health promotion and dental caries (2010) Braz Oral Res, 24 (SPEC ISSUE 1), pp. 18-25Sharma, S., Kugel, G., Amorphous calcium phosphate sealants - the potential to remineralize (2009) Inside Dent, 5Bartlett, D.W., Bureau, G.P., Anggiansah, A., Evaluation of the pH of a new carbonated soft drink beverage: an in vivo investigation (2003) J Prosthodont, 12, pp. 21-25Khan, A.A., Jain, S.K., Shrivastav, A., Prevalence of dental caries among the population of Gwalior (India) in relation of different associated factors (2008) Eur J Dent, 2, pp. 81-85Kugel, G., Arsenault, P., Papas, A., Treatment modalities for caries management, including a new resin infiltration system (2009) Compend Contin Educ Dent, 30 (SPEC ISSUE 3), pp. 1-10Kidd, E.A., Fejerskov, O., What Constitutes Dental Caries? Histopathology of carious enamel and dentin related to the action of cariogenic biofilms (2004) J Dent Res, 83 (SPEC ISSUE C), pp. C35-C38Mount, G.J., A new paradigm for operative dentistry (2007), 52, pp. 264-270Black, G.V., Operative Dentistry (1908) Chicago: Medico-Dental Publishing, 121Massler, M., Changing concepts in the treatment of carious lesions (1967) Br Dent J, 123, pp. 547-548ten Cate, J.M., Duijsters, P.P., Alternating demineralization and remineralization of artificial enamel lesions (1982) Caries Res, 16, pp. 201-210Featherstone, J.B., The continuum of dental caries - evidence for a dynamic disease process (2004) J Dent Res, 83 (SPEC ISSUE C), pp. 39-42Featherstone, J.B., Clinical aspects of the de/remineralization of teeth (1995) Adv Dent Res, 9, pp. 1-340. , edBrÀnnström, M., (1982) Dentin and pulp in restorative dentistry, , London: Wolfe Medical Publications LtdReynolds, E.C., Walsh, I.J., Additional aids to the remineralization of tooth structure (2005) Preservation and restoration of tooth structure, pp. 111-118. , Mount GJ, Hume WR, eds., 2 nd edn. Brisbane: Knowledge Books and SoftwareNgo, H.C., Mount, G.J., McIntyre, J., Chemical exchange between glass-ionomer restorations and residual carious dentine in permanent molar: an in vivo study (2006) J Dent, 34, pp. 608-613Pitts, N.B., Modern concepts of caries measurement (2004) J Dent Res, 83 (SPEC ISSUE C), pp. 43-47McComb, D., Systematic review of conservative operative caries management strategies (2001) J Dent Educ, 65, pp. 1154-1161Zero, D.T., Dentifrices, mouthwashes, and remineralization/ caries arrestment strategies (2006) BMC Oral Health, 6, pp. S9Mjör, I.A., Holst, D., Eriksen, H.M., Caries and restoration prevention (2008) J Am Dent Assoc, 139, pp. 565-570Reynolds, E.C., Cain, C.J., Shen, P., Retention in plaque and remineralization of enamel lesions by various forms of calcium in a mouthrinse or sugar-free chewing gum (2003) J Dent Res, 82, pp. 206-211Manton, D.J., Walker, G.D., Cai, F., Cochrane, N.J., Shen, P., Reynolds, E.C., Remineralization of enamel subsurface lesions in situ by the use of three commercially available sugar-free gums (2008) Int J Paediatr Dent, 18, pp. 284-290Walker, G.D., Cai, F., Shen, P., Casein phosphopeptideamorphous calcium phosphate incorporated into sugar confections inhibit the progression of enamel subsurface lesions in situ (2010) Caries Res, 44, pp. 33-40Paris, S., Meyer-Lueckel, H., Inhibition of caries progression by resin infiltration in situ (2010) Caries Res, 44, pp. 47-54Paris, S., Meyer-Lueckel, H., Colfen, H., Resin infiltration of artificial enamel caries lesions with experimental light curing resins (2007) Dent Mater J, 26, pp. 582-588Paris, S., Hopfenmuller, W., Meyer-Lueckel, H., Resin infiltration of caries lesion: an efficacy randomized trial (2010) J Dent Res, , doi: 10. 1177/0022034510369289Martignon, S., Ekstrand, K.R., Ellwood, R., Efficacy of sealing proximal early active lesions: an 18-month clinical study evaluated by conventional and subtraction radiography (2006) Caries Res, 40, pp. 382-388Phark, J.H., Duarte Jr., S., Meyer-Lueckel, H., Caries infiltration with resins: a novel treatment option for interproximal caries (2009) Compend Contin Educ Dent, 30 (SPES ISSUE 3), pp. 13-17ten Cate, J.M., Remineralization of deep enamel dentin caries lesions (2008) Aust Dent J, 53, pp. 281-285Doméjean-Orliaguet, S., Tubert-Jeannin, S., Riordan, P.J., French dentists' restorative treatment decisions (2004) Oral Health Prev Dent, 2, pp. 125-131Traebert, J., Wesoloski, C.I., Lacerda, J.T., Threshold of restorative decision in dental caries treatment among dentists from small Brazilian cities (2007) Oral Health Prev Dent, 5, pp. 131-135Mertz-Fairhurst, E.J., Curtis-Jr., J.W., Ergle, J.W., Ultraconservative and cariostatic sealed restorations: results at year 10 (1998) J Am Dent Assoc, 129, pp. 55-66Alves, L.S., Fontanella, V., Damo, A.C., Qualitative and quantitative radiographic assessment of sealed carious dentin: a 10-year prospective study (2010) Oral Surg Oral Med Oral Pathol Oral Radiol Endod, 109, pp. 135-141Maltz, M., Oliveira, E.F., Fontanella, V., A clinical, microbiologic, and radiographic study of deep lesions, after incomplete caries removal (2002) Quintessence Int, 33, pp. 151-159Weerheijm, K.L., van Amerongen, W.E., Eggink, C.O., The clinical diagnosis of occlusal caries: a problem (1989) ASDC J Dent Child, 56, pp. 196-200Murdoch-Kinck, C., McLean, M., Minimally invasive dentistry (2003) J Am Dent Assoc, 134, pp. 87-95Brostck, A., Early diagnosis and minimally invasive treatment of occlusal caries - a clinical approach (2004) Oral Health Prev Dent, 2 (SUPPL. 1), pp. 313-319Borges, B.C., Campos, G.B., da Silveira, A.D., de Lima, K.C., Pinheiro, I.V., Efficacy of a pit and fissure sealant in arresting dentin non-cavitated caries: a 1-year follow-up, randomized, single-blind, controlled clinical trial (2010) Am J Dent, 23, pp. 311-316Silveira, A.D., Borges, B.C., Varela, H.A., Progression of non-cavitated lesions in dentin through a nonsurgical approach: a preliminary 12-month clinical observation (2010) Eur J Dent, , in pressUysal, T., Amasyali, M., Koyuturk, A.E., Efficiency of amorphous calcium phosphate-containing orthodontic composite and resin modified glass ionomer cement on demineralization evaluated by a new laser fluorescence device (2009) Eur J Dent, 3, pp. 127-13
Superconductivity in the Nb2SnC compound
Nb2SnC is a member of the large family of lamellar materials that crystallize
in the hexagonal structure with space group P63/mmc which are isomorphs with
Cr2AlC, also named H-phase. In spite of the great number of compounds which
belong to this family, the superconductivity has been reported only for two
cases: Mo2GaC and Nb2SC. In this work we show that superconductivity can be
observed in Nb2SnC depending on the synthesis method used. The quality of the
superconductor is strongly dependent of the synthesis method and the optimal
results were reached for samples synthesized at 2.5 GPa and 523 +/- 50oC. This
sample showed a critical temperature close to 7.8K, revealed from magnetization
and transport measurement, the highest critical temperature reported up to now
for an H-phase.Comment: paper with 12 pages and 4 figure
Superconductivity in the ternary ZrVGe compound
We report bulk superconductivity in ZrVGe withTc=6K determined by magnetization, electronic transport and specific heat measurements. From the analysis of magnetization and resistivity data we obtain the thermodynamic critical fieldsΌ0Hc1andΌ0Hc2, respectively. The heat capacity data deviate from conventional BCS theory suggesting possible unconventional superconducting behavior