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1.
J Dent ; 40(2): 95-105, 2012 Feb.
Article in English | MEDLINE | ID: mdl-22079371

ABSTRACT

OBJECTIVES: In 2002, FDI (World Dental Federation) published a policy advocating that caries be treated by minimal intervention (MI). This MI policy has been accepted worldwide and is taught in universities. But acceptance in general dental practice has been slower, especially in Japan where healthcare payment and practice favour drilling and filling. To help disseminate this MI policy into general practice, the Japanese Society of Conservative Dentistry developed an evidence-based clinical guideline for restoring carious permanent teeth in adult patients. METHODS: The guideline was developed by a committee of nine university clinicians and a librarian. The committee selected the most frequent clinical questions in treating caries and used electronic databases to search and assess the best scientific evidence for each. Members then added their clinical experience and discussed to reach consensus on each question on treating caries with MI policy. Graded recommendations and guidance were made for each clinical question. The provisional guideline was strengthened after review and discussion with university researchers and general practitioners. RESULTS: The guideline addresses the 16 most frequent clinical questions in treating adult caries, including restorative methods and how to tackle root caries. Recommendations for treatment using MI policy were developed using the best scientific evidence and consensus of experienced clinicians. CLINICAL SIGNIFICANCE: The guideline offers a practical expert view of treating caries with the MI policy that incorporates the best scientific evidence, the latest techniques, the most preferable materials and the general consensus of expert clinicians.


Subject(s)
Consensus , Dental Caries/therapy , Dental Restoration, Permanent/methods , Evidence-Based Dentistry , Practice Guidelines as Topic , Adult , Composite Resins/chemistry , Databases, Bibliographic , Dental Alloys/chemistry , Dental Caries/diagnosis , Dental Cavity Preparation/methods , Dental Materials/chemistry , Glass Ionomer Cements/chemistry , Humans , Japan , Review Literature as Topic , Root Caries/therapy
2.
Biomaterials ; 22(20): 2713-7, 2001 Oct.
Article in English | MEDLINE | ID: mdl-11545305

ABSTRACT

A new method for treating carious dentine with alpha-tricalcium phosphate (alpha-TCP) dental cement containing antimicrobial agents has been recently introduced. However, the release behavior of antimicrobial agents from this cement has not yet been clarified. The aim of this study is therefore to examine the release profile of the antimicrobial agents from the alpha-TCP cement. Three kinds of antimicrobial agents (metronidazole, cefaclor and ciprofloxacin) were added to two commercially available alpha-TCP cements (new apatite liner type I and type II). The set cements were then immersed in water at 37 degrees C and the released antimicrobial agents and Ca ion were determined at regular intervals for three months. In addition, scanning electron microscopic observations were conducted before and after immersion for three months. The release profile of the cements containing antimicrobial agents varied depending on the types of antimicrobial agents. The incorporation of antimicrobial agents affected the setting reaction of the cements. The release behavior of the drugs also varied depending on the types of the cements. The differences in the release profile between type I and type II cements reflected the structures and compositions of their matrices.


Subject(s)
Anti-Infective Agents/chemistry , Bone Cements/chemistry , Calcium Phosphates/chemistry , Microscopy, Electron, Scanning
3.
J Dent ; 29(1): 7-13, 2001 Jan.
Article in English | MEDLINE | ID: mdl-11137633

ABSTRACT

OBJECTIVES: To analyze the relationship between the cavity depth and liners with postoperative sensitivity of resin composite restorations. METHODS: A clinical follow-up was conducted on 319 resin composite restorations made in the final year of an undergraduate program over a 3-year period. Along with the analyses of cavity type, cavity depth, type of pulpal protection and the materials used, the postoperative sensitivity was also examined on each restoration. RESULTS: Thirty-nine percent of the restorations had no protective layer (Group 1). As the depth of the prepared cavities increased, the restorations received one of the three pulpal protection methods; a calcium hydroxide base (Group 2), glass ionomer cement (Group 3), or protection with a calcium hydroxide base in combination with glass ionomer cement (Group 4). The incidence of postoperative sensitivity showed no significant difference among Groups 1, 2 and 3, but was significantly lower in Group 1 than in Group 4. The restorations made in shallow and medium depth cavities demonstrated significantly less-postoperative sensitivity than those made in deep cavities. The newer generation dentine-bonding agents showed a significantly lower incidence of postoperative sensitivity than the early generation group. CONCLUSIONS: Postoperative sensitivity in resin composite restorations was not related to the absence of protective layers but increased with the depth of cavities restored with the resin composite. The type of dentine-bonding agents could also be responsible for postoperative sensitivity.


Subject(s)
Composite Resins/adverse effects , Dental Cavity Lining/methods , Dental Pulp Capping/methods , Dental Restoration, Permanent/adverse effects , Dentin Sensitivity/etiology , Adolescent , Adult , Aged , Aged, 80 and over , Calcium Hydroxide , Dental Cavity Preparation , Dental Restoration, Permanent/methods , Dentin Sensitivity/prevention & control , Dentin-Bonding Agents/adverse effects , Electric Impedance , Female , Follow-Up Studies , Glass Ionomer Cements , Humans , Male , Middle Aged , Pain, Postoperative/etiology , Pain, Postoperative/prevention & control
4.
Biomaterials ; 20(17): 1573-8, 1999 Sep.
Article in English | MEDLINE | ID: mdl-10482411

ABSTRACT

The purpose of this study is to elucidate the water absorption characteristics of resin-modified glass-ionomer cements and to also investigate the relationship between the characteristics and mechanical strength after long-term water storage. The mechanism of water diffusion in these cements is also discussed. Water absorption was measured using a gravimetric analysis for 12 m, while the diffusion coefficient was calculated using Fick's law of diffusion. Water solubility was determined based on the weight of the residue in the immersed water. The compressive and diametral tensile strength were measured at 1, 2, 6, and 12 m. A correlation was observed between the diffusion coefficient and equilibrium water uptake, which thus suggests the water in the cements to diffuse through micro-voids in accordance with the 'Free volumetric theory'. A correlation was seen between the solubility and diffusion coefficient of the cements. The deterioration ratio, defined as the ratio of the strength at 12 m versus that at 1 m, was also calculated. Finally, a negative correlation was observed between the deterioration ratio of the compressive strength and the diffusion coefficients of the cements.


Subject(s)
Glass Ionomer Cements , Resins, Plant/pharmacology , Water , Absorption/drug effects , Analysis of Variance , Diffusion , Drug Storage , Solubility/drug effects , Tensile Strength/drug effects
5.
Dent Mater J ; 18(4): 337-46, 1999 Dec.
Article in English | MEDLINE | ID: mdl-10786155

ABSTRACT

The effect of buffer agents incorporated in glutaraldehyde disinfectants on the surface quality of dental models was examined by the measurement of surface roughness, X-ray diffraction analysis and SEM observation. Seven experimental glutaraldehyde disinfectants were prepared using two buffer agents, potassium acetate alone or potassium acetate and sodium hydrogen carbonate in combination. Four kinds of sulfate--zinc, calcium, potassium and magnesium sulfate--were added to these disinfectants in order to accelerate the hydration of calcium sulfate hemihydrate. The impressions treated with the experimental disinfectants for 1 h produced stone surfaces which had significantly lower surface roughness values than those treated with the commercial disinfectants (p < 0.05). The X-ray diffraction analysis and SEM observation showed that these superior surfaces were produced as a result of significant reductions in the amount of residual calcium sulfate hemihydrate. Replacement of buffer agents in commercial glutaraldehyde disinfectants with chemicals such as those studied in the present study will improve the surface quality of dental stone.


Subject(s)
Calcium Sulfate/chemistry , Dental Disinfectants/chemistry , Dental Impression Materials/chemistry , Glutaral/chemistry , Models, Dental , Alginates/chemistry , Buffers , Humans , Materials Testing , Microscopy, Electron, Scanning , Surface Properties , Water/chemistry , X-Ray Diffraction
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