Comparison of different impression techniques for edentulous jaws using three-dimensional analysis.

Purpose: The purpose of this study was to compare two novel impression methods and a conventional impression method for edentulous jaws using 3-dimensional (3D) analysis software.

Materials And Methods: Five edentulous patients (four men and one woman; mean age: 62.7 years) were included.

Effect of ferrule on the fracture resistance of mandibular premolars with prefabricated posts and cores.

Purpose: This study evaluated fracture resistance with regard to ferrule lengths and post reinforcement on endodontically treated mandibular premolars incorporating a prefabricated post and resin core.

Materials And Methods: One hundred extracted mandibular premolars were randomly divided into 5 groups (n=20): intact teeth (NR); endodontically treated teeth (ETT) without post (NP); ETT restored with a prefabricated post with ferrule lengths of either 0 mm (F0), 1 mm (F1), or 2 mm (F2). Prepared teeth were restored with metal crowns.

Analysis of the width ratio and wear rate of maxillary anterior teeth in the Korean population.

Purpose: The purpose of this study was to compare the width ratio of maxillary anterior teeth according to age in the Korean population and to evaluate the maxillary central incisor width-to-length (W/L) ratio, given differences in age and gender.

Materials And Methods: Ninety-three Korean adults were divided into 3 groups (n = 31) by age. Group I was 20 - 39 years old, Group II was 40 - 59 years old, and Group III was over 60 years of age.

A New Fast and Simple Border Molding Process for Complete Dentures Using a Compound Stick Gun.

This article describes the use of a newly invented compound stick gun to take impressions for complete denture. The border molding process involves loading the modeling compound in an electric heating device and applying an even thickness of compound on the flange of a custom tray at a proper temperature without hot water tempering. This method provides a quicker and easier border molding process alternative to conventional techniques.

Analysis of Removal Torque of Injection Molded Zirconia Implants; An Experimental Study on Beagles.

This study compared the removal torque between injection molded zirconia implants and titanium implants with resorbable blast media (RBM) surfaces in beagle humeri. Fifteen screw-shaped implants were classified into 3 groups; titanium implant with RBM surface (Group RT), injection molded zirconia implant (Group Zr) and injection molded zirconia implant with sand-blasted surface (Group ZrS). Implants were inserted into beagle humeri.

Influence of preparation depths on the fracture load of customized zirconia abutments with titanium insert.

Purpose: This study evaluated the fracture load of customized zirconia abutments with titanium insert according to preparation depths, with or without 5-year artificial aging.

Materials And Methods: Thirty-six identical lithium disilicate crowns (IPS e.max press) were fabricated to replace a maxillary right central incisor and cemented to the customized zirconia abutment with titanium insert on a 4.

Cytotoxicity of soft denture lining materials depending on their component types.

Purpose: To evaluate the difference in cytotoxicity of soft denture lining materials depending on their component types.

Materials And Methods: Ten commercially available soft denture lining materials (SDLM) consisting of five silicone-based materials and five acrylic-based materials were evaluated. For the MTT test, cured SDLM samples were extracted in a culture medium for 24 hours, and L-929 cells were incubated in the extracted medium for 24 hours.

Shore hardness and tensile bond strength of long-term soft denture lining materials.

Statement Of Problem: Reduced softness and separation from the denture base are the most significant problems of long-term soft lining materials.

Purpose: The purpose of this study was to evaluate the durometer Shore A hardness and tensile bond strength of long-term soft denture lining materials and to investigate the correlation between these 2 properties.

Material And Methods: A group of 7 soft lining materials, 6 silicone based (Dentusil, GC Reline Soft, GC Reline Ultrasoft, Mucopren Soft, Mucosoft, Sofreliner Tough) and 1 acrylic resin based (Durabase), were evaluated for durometer Shore A hardness and tensile bond strength to heat-polymerized denture base resin (Lucitone 199).

Effect of loading time on marginal bone loss around hydroxyapatite-coated implants.

Objectives: The objective of this study is compare the rate of marginal bone resorption around hydroxyapatite-coated implants given different loading times in order to evaluate their stability.

Materials And Methods: The study was conducted retrospectively for one year, targeting 41 patients whose treatment areas were the posterior maxilla and the mandible. Osstem TS III HA (Osstem Implant Co.

Titanium dioxide nanotube modified implants: an animal study on bone formation.

This study examined the bone response to titanium dioxide nanotube modified implants. A total of 24 implants were placed in the femur of 4 beagles. Before placement, screw-shaped implants were classified into 3 groups; machined surface (group M), titanium dioxide nanotube modification of the machined surface (group MN) and titanium dioxide nanotube modification of the RBM surface (group RN).

A morphometric analysis of maxillary central incisor on the basis of facial appearance in Korea.

Purpose: We aimed to identify a more esthetic width-to-length ratio by analyzing maxillary central incisor of Korean adult population. Information regarding tooth ratio in the Korean population may be useful to clinicians when restoring anterior teeth.

Materials And Methods: A total of 40 men and 40 women were included in this study.

Marginal accuracy and internal fit of machine-milled and cast titanium crowns.

Statement Of Problem: Titanium is an alternative tooth restorative material because of a its biocompatibility and mechanical properties. However, there is little information on the marginal accuracy of a complete titanium crown with different margin configurations.

Purpose: This study examined the effect of fabrication method and margin configuration on the marginal and internal fit of complete titanium crowns.

Fracture load of implant-supported zirconia all-ceramic crowns luted with various cements.

This study compared the fracture load and failure types of implant-supported zirconia all-ceramic crowns cemented with various luting agents. The ceramic frameworks were fabricated from a presintered yttria-stabilized zirconium dioxide block using computer-aided design/computer-assisted manufacturing technology, and were then veneered with feldspathic porcelain. Three luting agents were used.

Shear bond strength and failure types of polymethyl methacrylate denture base resin and titanium treated with surface conditioner.

This study compared the shear bond strength and failure types of a polymethyl methacrylate (PMMA) denture base resin to commercially pure (CP) titanium, Ti-6Al-4V alloy, and cobalt-chromium alloy using a metal surface conditioner. The PMMA denture base resin (5 x 5 x 5 mm(3)) was cured onto disks, 10 mm in diameter and 2.5-mm thick.

Histologic evaluation and removal torque analysis of nano- and microtreated titanium implants in the dogs.

Statement Of Problem: A number of studies about the nano-treated surfaces of implants have been conducting along with micro-treated surfaces of implants.

Purpose: The purpose of this study was to get information for the clinical use of nano-treated surfaces compared with micro-treated surfaces by measuring removal torque and analyzing histological characteristics after the placement of various surface-treated implants on femurs of dogs.

Material And Methods: Machined surface implants were used as a control group.

Shear bond strength of composite resin to titanium according to various surface treatments.

Statement Of Problem: When veneering composite resin-metal restoration is prepared, the fact that bond strength between Ti and composite resin is relatively weak should be considered.

Purpose: The purpose of this study is to evaluate the shear bond strength between the veneering composite resin and commercial pure (CP) Ti / Ti-6Al-4V alloy according to the method of surface treatment.

Material And Methods: The disks were cast by two types of metal.

Cell response to a newly developed Ti-10Ta-10Nb alloy and its sputtered nanoscale coating.

Statement Of Problem: The success of titanium implants is due to osseointegration or the direct contact of the implant surface and bone without a fibrous connective tissue interface.

Purpose: The purpose of this study was to evaluate the osteoblast precursor response to titanium - 10 tantalum - 10 niobium (Ti-Ta-Nb) alloy and its sputtered coating.

Material And Methods: Ti-Ta-Nb coatings were sputtered onto the Ti-Ta-Nb disks.

Comparion of stability in titanium implants with different surface topographies in dogs.

Statement Of Problem: A few of studies which compared and continuously measured the stability of various surface treated implants in the same individual had been performed.

Purpose: We aim to find the clinical significance of surface treatments by observing the differences in the stabilization stages of implant stability.

Material And Methods: Eight different surface topographies of dental implants were especially designed for the present study.

Effect of adhesive primers on bonding strength of heat cure denture base resin to cast titanium and cobalt-chromium alloy.

Statement Of Problem: The poor chemical bonding of a denture base resin to cast titanium framework often introduces adhesive failure and increases microleakage.

Purpose: This study evaluated the shear bond strengths of a heat cure denture base resin to commercially pure titanium, Ti-6Al-4V alloy and a cobalt-chromium alloy using two adhesive primers.

Material And Methods: Disks of commercially pure titanium, Ti-6Al-4V alloy and a cobalt-chromium alloy were cast.

Oral rehabilitation for a patient with oligodontia and maxillary hypoplasia.

An 18 year old female with oligodontia and maxillary hypoplasia was treated using an interdisciplinary team approach involving orthodontists, maxillofacial surgeons and prosthodontists. Full mouth one-piece fixed partial dentures were the final restoration. The fixed partial dentures fabricated for the maxilla and mandible using the concept of a shortened dental arch resulted in improved esthetics and the masticatory function.

Surface characteristics and bioactivity of oxide film on titanium metal formed by thermal oxidation.

In this study, we characterized the surface of oxide film formed on titanium metal through the use of thermal treatment and investigated the effect of surface characteristics on the bioactivity of titanium. The as-received sample group was prepared by polishing and cleaning CP-Ti as a control group, and thermally oxidized sample groups were prepared by heat treating at 530, 600, 700, 800, 900, and 1000 degrees C respectively. Micro-morphology, crystalline structure, chemical composition, and binding state were evaluated using FE-SEM, XRD, and XPS.

Comparison of the fracture strengths of metal-ceramic crowns and three ceromer crowns.

Statement Of Problem: The fracture strength of a number of new ceromer systems for the fabrication of anterior fixed partial dentures is unknown.

Purpose: The purpose of this study was to compare the fracture strengths of metal-ceramic crowns and 3 types of ceromer crowns in a simulated anterior tooth preparation.

Material And Methods: A resin maxillary central incisor analog was prepared with a 5-degree convergence angle and a 90-degree, 1-mm shoulder.