Self-curing Resin Research Articles

Studies on dental self-curing resins (27). Adhesion of monomers with aromatic carboxylic group to the metals and alloys

Studies on dental self-curing resins (27). Adhesion of monomers with aromatic carboxylic group to the metals and alloys

Studies on Dental Self-curing Resins(26) : Effect of 4-META and 4-MET Aaddition to the MMA-TBBO Resin

Studies on Dental Self-curing Resins(26) : Effect of 4-META and 4-MET Aaddition to the MMA-TBBO Resin

Studies on Dental Self-curing Resins (25) : Effect of Ferric Chloride or Cupric Chloride on the Polymerization of Methyl Methacrylate

Studies on Dental Self-curing Resins (25) : Effect of Ferric Chloride or Cupric Chloride on the Polymerization of Methyl Methacrylate

Sm-Co 合金磁石を用いた根面アタッチメントの臨床例 : 第 2 報 磁石の被覆法について

Sasaki and Kinouchi (1976) reported on a stud attachment using the Sm-Co alloy magnet and Pd-Co-Ni alloy for casting. Since self-curing resin was used as the coating material for this magnet, magnetism is weakened and exposure of the magnet makes rusting easy. Therefore, 4-META resin was used to make the coating on the magnet thin and uniform. When waxing up a root cap, an acrylic plate was used to make the surface smooth and flat. These modifications assure reliable magnetism and prevention of rusting. The details are described in the text.

Studies on Dental Self-Curing Resins (24) : Adhesion to Dentine by Mechanical Interlocking

Studies on Dental Self-Curing Resins (24) : Adhesion to Dentine by Mechanical Interlocking

Differential accuracy of silicone-body and self-curing resin interocclusal records and associated weight loss

Two types of one brand of silicone-body impression material and two brands of self-curing resin were tested as interocclusal recording materials to evaluate their dimensional stability and associated weight losses due to volatiles. Silicone-body interocclusal records were shown to be more reliable than self-curing resin records. However, all of the materials tested exhibited some degree of weight loss and dimensional change over time.

Pulpal response to an epimine plastic

Pulpal reactions to three dental materials, Scutan, a self-curing resin, and zinc oxide-eugenol cement, were comparable. The pulpal reactions to Scutan appeared to be milder than those to a self-curing resin or to zinc oxide-eugenol cement.

Temperature rise in pulp chamber during fabrication of temporary self-curing resin crowns

Temperature rise in pulp chamber during fabrication of temporary self-curing resin crowns

Studies on dental self‐curing resins. XV. Application of nitrene to reactive adhesive with a tooth

Effectiveness of p-azidobenzoyloxyethyl methacrylate on the adhesion of a tooth was studied. This methacrylate, dissolved in suitable monomer solvents such as 2-hydroxyethyl methacrylate, was painted on ivory- or acid-etched enamel and the surface was irradiated by ultraviolet light. Photolysis of the azide produced a nitrene which was reactive with polypeptides in the tooth. As the treated surface must have affinity with methyl methacrylate (MMA) and pol(methyl methacrylate) (PMMA), it was joined with a PMMA bar by the self-curing resin. The adhesive strength was 100 kg/cm2 with ivory or 65 kg/cm2 with enamel. Graft copolymerization of methyl methacrylate onto collagen may take place by the nitrene prepared in situ by photolysis of the azide. Subject to satisfactory biologic evaluation, this coupler may be useful in the development of adhesive dental filling materials and fissure sealants.

Effect of fluorides on the bonding of resins to phosphoric acid-etched bovine enamel

Various fluorides, such as NaF, SnF 2, acidulated NaF, TiF 4, and ZrF 4 as well as casein and saliva, were applied to acid-conditioned enamel surfaces to study their effect on bonding, resin penetration and wettability of enamel. Topical treatment of ground-etched enamel with these agents, prior to application of Sevriton self-curing resin adhesive, generally resulted in significant reductions in bond strength. It was shown by SEM that fluoride application produced reaction products, or precipitates, which covered the surface and appeared partly to fill inter-prismatic spaces, interfering with resin penetration and tag formation which are considered responsible in large measure for the bonding obtained on enamel surfaces. The formation of fluoride reaction products also reduced the wettability of the surface, a situation also conducive to lower bonding strengths. Titanium tetrafluoride produced an acid-resistant, coherent film which floated off the enamel surface after its decalcification in 5 per cent HCl. The findings support the idea that, in the clinical use of adhesives for sealing pits and fissures against caries, topical fluoride treatments or contact with saliva should be avoided subsequent to acid-conditioning of the enamel surface. Fluoride treatments, however, may be given subsequent to adhesive application.

Self-curing resins in constructing patterns for small castings

The benefits of quick setting cold-curing resins, either alone or in combination with wax, for the construction of patterns have been discussed. Resin patterns should be constructed in the following situations: (1) when difficulties with regard to parallelism exist in the preparation, (2) when undercuts are present on the preparation or on the die, (3) when a try-in of the pattern on the tooth is desirable or necessary, and (4) when danger of deforming or marring the inlay wax is apparent because of the small size, or the shape of the pattern.

Penetration of resin dental materials into enamel surfaces with reference to bonding

The penetration of Bonfil, Sevriton, Addent, Dakor and two experimental adhesives into enamel surfaces was investigated with particular reference to the possibility that mechanical factors due to resin penetration might be involved in the bonding of these materials to acid conditioned enamel surfaces. Radiosulphur 35 as SO 4 and basic fuchsin dye did not penetrate the interface between the Sevriton self-curing resin or the adhesive and the enamel surface to which they were attached even after 6 months to 1 year in physiological saline solution. Enhanced bonding to acid conditioned surfaces compared to unconditioned ones appeared to be associated with the presence of “prism-like” tags presumably formed by penetration of the resin into enamel spaces created by the acid conditioning. When surfaces were not conditioned prior to application of the test materials poor bonding resulted with absences of tags. Differences in bonding strength and/or its longevity among the various materials may be related to differences in their physical and chemical properties.

Histologic Reaction of the Palatal Mucosa to Self-curing Resin

Histologic Reaction of the Palatal Mucosa to Self-curing Resin

Relationship between crazing of acrylic resin fillings and times of finishing and polishing

S ELF-CURING acrylic resin has unique properties as a filling material. Inserted with the brush-on technique, the material is well suited to restore even class V cavity preparations, wedge shaped defects and, by the use of a wire skeleton,lJ more complex preparations. The cumulative result of past investigations has eliminated many disadvantages of the self-cured resins .3-12 Today the clinical results surpass those of silicate cement restorations.13J4

Studies on the self-curing resins for denture base materials

Studies on the self-curing resins for denture base materials

Denture reliners—direct, hard, self-curing resin

A survey of the properties of six brands of direct, hard, self-curing denture re-liners revealed that most such reliners harden with considerable rise in temperature. When cured under clinical conditions, porous resins result. Knoop number, water solubility, recovery values and transverse strength of relined denture base specimens are poorer than those for self-curing denture base resins. Color stability of most brands is unsatisfactory. Detail reproduction of the surface of the tissue appears adequate. No significant war page or dimensional change of relined dentures was noted. The direct reliners are not adequate for long-term serviceability and should be considered as temporary expedients.

Self-curing Resins in Restorative Dentistry

Self-curing Resins in Restorative Dentistry

The Direct Self-curing Resin Restoration

The Direct Self-curing Resin Restoration

即時重合レジンに関する実験 (その1) (その2)

即時重合レジンに関する実験 (その1) (その2)

〓時重合レジンと燐酸セメントの合着力に関する研究

The retaining force of inlays cemented with self-curing resin and zinc phosphate cement was studied, testing itself and the surface adhesion as an element of it. The following results and decisions were obtained.1. The surface adhesions of resin and cement were respectively 1.6 and 7.2 kg/cm2 to dentin, and 8.4 and 18. 8 kg/cm2 to enamel.2. The retaining force of resin was about one third that of cement. However, that of resin will be kept longer because of its excellent chemical stability. The clinical usefulness of the selfcuring resin as a cementing medium for inlays will be decided in further studies.3.The adhesion to dentin was considerably weakened by water, though that of resin to enamel was less weakened and that of cement to enamel was reversely stronger in the wet state. Enamel walls are considered as excellent cementing bases.4. The adhesion to coarser walls was stronger than that to smoother walls. Such a difference was great on enamel but slight on dentin.5. Upon analysing the retaining force of the simple column inlays tested here, the interlocking force took 83% in the case of resin and 87% in that of cement. The surface adhesion took 17% and 13% respectively6. The adhesion of resin is very strong in dry state but very week in wet state. The direct resin filling therefore must be kept perfectly dry during its setting to prevent it from separating from the cavity wall by its curing shrinkage. Besides, the cavity for resin filling must be given round undercuts with definite jaws for mechanical retension.