Effect of the amount of light energy transmitted through CAD/CAM resin block on bonding performance of four types of resin cement adhesive systems.

Resin-ceramic hybrid materials for computer-aided design/computer-aided manufacturing (CAD/CAM resins) have been developed. In this study, the effects of the amount of light energy transmitted through the four types of 1.5-mm-thick CAD/CAM resin blocks on the bond performance of corresponding resin cement adhesive systems consisting of an adhesive and a dual-curable resin cement were examined.

Zirconia surface modification by a novel zirconia bonding system and its adhesion mechanism.

Objective: Bonding to zirconia has been of great interest over the last 10-15 years. The aim of this study was to develop a zirconia bonding system and clarify its adhesion mechanism.

Methods: A zirconia primer was prepared using tetra-n-propoxy zirconium (TPZr) and water.

Evaluation of irradiation effects of near-infrared free-electron-laser of silver alloy for dental application.

In the application of lasers in dentistry, there is a delicate balance between the benefits gained from laser treatment and the heat-related damage arising from laser irradiation. Hence, it is necessary to understand the different processes associated with the irradiation of lasers on dental materials. To obtain insight for the development of a safe and general-purpose laser for dentistry, the present study examines the physical effects associated with the irradiation of a near-infrared free-electron laser (FEL) on the surface of a commonly used silver dental alloy.

Quantitative Evaluation of MDP-Ca Salt and DCPD after Application of an MDP-based One-step Self-etching Adhesive on Enamel and Dentin.

Purpose: To investigate the effects of an experimental 10-methacryloyloxydecyl dihydrogen phosphate (MDP)-based one-step self-etching adhesive (EX adhesive) applied to enamel and dentin on the production of calcium salt of MDP (MDP-Ca salt) and dicalcium phosphate dehydrate (DCPD) at various periods.

Materials And Methods: The EX adhesive was prepared. Bovine enamel and dentin reactants were prepared by varying the application period of the EX adhesive: 0.

Effects of degree of dissociation of acid used on hydrolytic durability of ceramic primer.

In this study, effects of the degree of dissociation of acids on the hydrolysis rate of methoxy group in γ-methacryloxypropyltrimethoxysilane (γ-MPS) and the adsorption characteristics of γ-MPS on ceramic surfaces were studied using acetic, phosphoric, and hydrochloric acids. Hydrolytic stability of γ-MPS adsorption layer at the resin-ceramic interface was thus examined. (29)Si NMR observations of acidactivated γ-MPS and contact angle measurements following ceramic surface silanization were performed.

Development of MDP-based one-step self-etch adhesive--effect of additional 4-META on bonding performance.

We designed three experimental 10-methacryloyloxydecyl dihydrogen phosphate (MDP)-based one-step (EX) adhesives consisting of MDP, urethane dimethacrylate, and triethylene glycol dimethacrylate adhesives with different water contents (98.4, 196.8, and 294.

Ceramic bond durability and degradation mechanism of commercial gamma-methacryloxypropyl trimethoxysilane-based ceramic primers.

Purpose: To investigate the bond durability and degradation mechanism of various commercial ceramic primers that are based on gamma-methacryloxypropyl trimethoxysilane (gamma-MPTS) and contain various organic additives. The null hypotheses tested were that (1) the type of ceramic primer had no effect on the bond strength after thermocycling and (2) the type of ceramic primer had no effect on the water contact angle after rinsing with THF.

Methods: The adherent was a silica-based ceramic block used for computer-aided design/computer-aided manufacturing (CAD-CAM).

A selective medium for Rothia mucilaginosa and its distribution in oral cavities.

A selective medium for Rothia mucilaginosa (RMSM) was developed to examine the population of R. mucilaginosa in oral cavities. The growth recovery of R.

A novel selective medium for the isolation and distribution of Rothia dentocariosa in oral cavities.

Rothia dentocariosa is an indigenous microbial flora of dental plaque. To examine the bacterium population in oral cavities, a novel selective medium, designated RDSM, was developed for the isolation of R. dentocariosa.

Effects from applying adhesive agents onto silanated porcelain surface on the resin bond durability.

This study examined the effects on the bond durability of resins arising from the application of adhesive agent on porcelain surface, silanated by a ceramic primer consisting of gamma-methacryloxypropyltrimethoxysilane (gamma-MPTS), by comparing shear bond strengths before and after thermocycling. When an adhesive agent was applied to a porcelain surface which had been silanated by a ceramic primer for 10 seconds, a significant reduction in resin bonding durability was observed. Extending the silanating period of the ceramic primer to 60 minutes resulted in an increase in resin bonding durability to the porcelain surface.

[Studies evaluating measurement accuracy of CMS-JAW, a jaw motion tracking device with six degrees of freedom using an ultrasonic recording system].

Purpose: For diagnoses of temporomandibular dysfunction, reports indicate the importance of analyzing jaw movements using a jaw motion tracking device with six degrees of freedom. However, such devices are not widely applied in clinical practice, due to difficulty of use. To determine whether CMS-JAW (a newly developed six degrees of freedom jaw motion tracking device that features easy analysis of jaw movements) offers the measurement accuracy required for clinical use, we evaluated the device by measuring condyle translation and rotation during jaw movement.

[Bonding of resin cement to bleached dental enamel].

Purpose: The effects of bleaching times, types of etching agent and storage period of bleached bovine tooth on the shear bond strength of resin cement to the enamel were examined.

Materials And Methods: Bovine teeth were repeatedly bleached 0, 1, 3, and 5 times then stored in 37 degrees C water for 1 week. The effect of bleaching number of the bovine tooth on the bond strength of resin cement to the enamel was investigated using 40% phosphoric acid (EG) etching technique.

NMR study on the adhesion efficacy of experimental phosphonic acid monomers.

Three experimental self-etching primers - consisting of N-methacryloyl-omega-aminoalkyl phosphonic acid (NMomegaP) with different methylene chain lengths and N-methacryloyl glycine (NMGly) - were formulated. The influence of methylene chain length in NMomegaP derivatives on the chemical nature of calcium salts was examined following their application to tooth components. Bond strengths of experimental self-etching primers created with these monomers to enamel and dentin were also investigated.

[Effectiveness of methacrylamide monomer for dentin bonding].

Purpose: In this study, we investigated the conditioning efficacy of a self-etching primer consisting of methacrylamide, N-methacryloyl-omega-amino acid (M omega A) derivatives for enhancing the bond strength of resin to crown and root dentins.

Methods: A series of four M omega A derivatives, with different methylene chain numbers, were synthesized, as follows. 1: N-methacrylole glycine (Gly); 2: N-methacrylole-beta-alanine (beta Ala); 3: N-methacrylole-4-aminobutyric acid (Bu); 4: N-methacrylole-5-aminovaleric acid (Va).

Development of bonding system for resin core construction by MomegaA adhesive.

We designed self-etching primers consisting of a series of four N-methacryloyl-omega-amino acids, MomegaA, of different methylene chain numbers for resin core construction. The interacted amount of MomegaA's carboxylic acid with root or crown dentin apatite was determined, and its effects on dentin bond durability examined. The addition of both dentin particles to the MomegaA solutions caused the carbonyl carbon peak of carboxylic acid in MomegaA to shift to a lower field, chiefly because of an acid-base interaction between carboxylic acid and calcium.

Experimental and computational approach for evaluating the mechanical characteristics of dental composite resins with various filler sizes.

This study aimed to investigate the influence of particle size of fillers on flexural properties of dental composite resins by laboratory testing with computational analysis validation. Four kinds of silica fillers with mean particle sizes of 3.3, 4.

Influence of implant/abutment joint designs on abutment screw loosening in a dental implant system.

The objective of this study was to investigate the influence of implant/abutment joint designs on abutment screw loosening in a dental implant system, using nonlinear dynamic analysis of the finite element method (FEM). This finite element simulation study used two dental implant systems: the Ankylos implant system (Degusa Dental, Hanau, German) with a taper joint (taper joint-type model), and the Bränemark implant system (Nobel Biocare, Gothenburg, Sweden) with an external hex joint (external hex joint-type model). The nonlinear dynamic analysis was performed using three-dimensional finite element analysis.

Influence of cortical bone quality on stress distribution in bone around dental implant.

Using finite element method (FEM), this study sought to investigate how the thickness and Young's modulus of cortical bone influenced stress distribution in bone surrounding a dental implant. The finite element implant-bone model consisted of a titanium abutment, a titanium fixture, a gold alloy retaining screw, cancellous bone, and cortical bone. The results showed that von Mises equivalent stress was at its maximum in the cortical bone surrounding dental implant.

Gas-Liquid Chromatographic Determination of Butylated Hydroxytoluene in Modified Powdered Milk.

A method to determine butylated hydroxytoluene (BHT) in modified powdered milk was established. After solvent extraction of fat from powdered milk, BHT was analyzed by gas chromatography. Recovery of BHT from the sample was 89.