scholarly journals Effect of the use of die spacer on the marginal fit of copings cast in NiCr, NiCrBe and commercially pure titanium

2007 ◽  
Vol 18 (3) ◽  
pp. 225-230 ◽  
Author(s):  
Natércia Carreira Soriani ◽  
Mônica Barbosa Leal ◽  
Silvana Maria Paulino ◽  
Valéria Oliveira Pagnano ◽  
Osvaldo Luiz Bezzon
Keyword(s):  
Metal Matrix ◽  
Pure Titanium ◽  
Optical Microscope ◽  
Commercially Pure Titanium ◽  
Marginal Fit ◽  
Type Iv ◽  
Commercially Pure ◽  
Significant Difference ◽  
Marginal Discrepancy ◽  
Die Spacer

The goal of this study was to evaluate the effect of using die spacers on the marginal fit of NiCr (M1) and NiCrBe (M2) alloys and commercially pure titanium (cpTi) (M3) copings cast by the lost wax technique. Using a metal matrix, 45 resin added extra hard type IV stone models were obtained for the fabrication of wax patterns under the following conditions: no die spacer (A), with one die spacer layer (B) and with two die spacer layers (C), with five repetitions for each condition (alloy x die). Each die was waxed and the wax patterns were invested as per manufacturer's instructions. Three wax patterns were embedded in each casting ring, each corresponding to one of the conditions. Each coping, seated to the metal matrix by a seating pressure standardizing device (SPSD), was taken to an optical microscope for measurement of marginal discrepancy. The obtained data (µm) were analyzed statistically by ANOVA and Tukey' test (a=5%). There was statistically significant difference (p<0.05) among the materials (M1=110.67; M2=130.33 and M3=148.33). Regarding the use of the die spacer, there was a statistically significant difference (p<0.05) among the three conditions (A=162.00; B=131.06 and C=96.67). It was concluded that there is less marginal discrepancy with two die spacer layers.

scholarly journals Evaluation of Mechanical Properties and Marginal Fit of Crowns Fabricated Using Commercially Pure Titanium and FUS-Invest

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Jinshuang Wu ◽  
Xianli Wang ◽  
Helin Xing ◽  
Tianwen Guo ◽  
Chaofang Dong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Testing Machine ◽  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
Marginal Fit ◽  
Commercially Pure ◽  
Universal Testing ◽  
Single Crown ◽  
Significant Difference ◽  
Internal Fit

This study investigated the mechanical properties and single crown accuracy of the tailor-made Fourth University Stomatology investment (FUS-invest) for casting titanium. Background. Current investment for casting titanium is not optimal for obtaining high-quality castings, and the commercially available titanium investment is costly. Methods. Titanium specimens were cast using the tailor-made FUS-invest. The mechanical properties were tested using a universal testing machine. Fractured castings were characterized by energy-dispersive spectroscopy. 19 titanium crowns were produced using FUS-invest and another 19 by Symbion. The accuracy of crowns was evaluated. Results. The mechanical properties of the titanium cast by FUS-invest were elastic modulus 125.6 ± 8.8 GPa, yield strength 567.5 ± 11.1 MPa, tensile strength 671.2 ± 15.6 MPa, and elongation 4.6 ± 0.2%. For marginal fit, no significant difference (P>0.05) was found at four marker points of each group. For internal fit, no significant difference (P>0.05) was found between two groups, whereas significant difference (P<0.01) was found at different mark point of each group. Conclusions. The mechanical properties of titanium casted using FUS-invest fulfilled the ISO 9693 criteria. The marginal and internal fit of the titanium crowns using either the FUS-invest or Symbion were similar.

scholarly journals The influence of mold temperature on the fit of cast crowns with commercially pure titanium

2005 ◽  
Vol 19 (2) ◽  
pp. 139-143 ◽  
Author(s):  
Wagner Sotero Fragoso ◽  
Guilherme Elias Pessanha Henriques ◽  
Edwin Fernando Ruiz Contreras ◽  
Marcelo Ferraz Mesquita
Keyword(s):  
Pure Titanium ◽  
Mold Temperature ◽  
Commercially Pure Titanium ◽  
Mechanical Grinding ◽  
Marginal Fit ◽  
Commercially Pure ◽  
Cp Ti

Commercially pure titanium (CP Ti) has been widely applied to fabricate cast devices because of its favorable properties. However, the mold temperature recommended for the manufacture of casts has been considered relatively low, causing inadequate castability and poor marginal fit of cast crowns. This study evaluated and compared the influence of mold temperature (430°C - as control, 550°C, 670°C) on the marginal discrepancies of cast CP Ti crowns. Eight bovine teeth were prepared on a mechanical grinding device and impressions were used to duplicate each tooth and produce eight master dies. Twenty-four crowns were fabricated using CP Ti in three different groups of mold temperature (n = 8): 430°C (as control), 550°C and 670°C. The gap between the crown and the bovine tooth was measured at 50 X magnification with a traveling microscope. The marginal fit values of the cast CP Ti crowns were submitted to the Kruskal-Wallis test (p = 0.03). The 550°C group (95.0 µm) showed significantly better marginal fit than the crowns of the 430°C group (203.4 µm) and 670°C group (213.8 µm). Better marginal fit for cast CP Ti crowns was observed with the mold temperature of 550°C, differing from the 430°C recommended by the manufacturer.

The effect of commercially pure titanium and alternative dental alloys on the marginal fit of one-piece cast implant frameworks

2007 ◽  
Vol 35 (10) ◽  
pp. 800-805 ◽  
Author(s):  
Érica Miranda de Torres ◽  
Renata Cristina Silveira Rodrigues ◽  
Maria da Gloria Chiarello de Mattos ◽  
Ricardo Faria Ribeiro
Keyword(s):  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
Dental Alloys ◽  
Marginal Fit ◽  
Commercially Pure

scholarly journals Effect of fluoride sodium mouthwash solutions on cpTI: evaluation of physicochemical properties

2012 ◽  
Vol 23 (5) ◽  
pp. 496-501 ◽  
Author(s):  
Marcelo Bighetti Toniollo ◽  
Rodrigo Galo ◽  
Ana Paula Macedo ◽  
Renata Cristina Silveira Rodrigues ◽  
Ricardo Faria Ribeiro ◽  
...  
Keyword(s):  
Anodic Polarization ◽  
Titanium Surface ◽  
Pure Titanium ◽  
Distilled Water ◽  
Commercially Pure Titanium ◽  
Time Intervals ◽  
Commercially Pure ◽  
Significant Difference ◽  
Scanning Electron ◽  
Corrosion Data

The effects of fluoride, which is present in different oral hygiene products, deserve more investigation because little is known about their impact on the surface of titanium, which is largely used in Implantology. This study evaluated the surface of commercially pure titanium (cpTi) after exposure to different concentrations of sodium fluoride (NaF). The hypothesis tested in this study was that different concentrations of NaF applied at different time intervals can affect the titanium surface in different ways. The treatments resulted in the following groups: GA (control): immersion in distilled water; GB: immersion in 0.05% NaF for 3 min daily; GC: immersion in 0.2% NaF for 3 min daily; GD: immersion in 0.05% NaF for 3 min every 2 weeks; and GE: immersion in 0.2% NaF for 3 min every 2 weeks. The experiment lasted 60 days. Roughness was measured initially and every 15 days subsequently up to 60 days. After 60 days, corrosion analysis and anodic polarization were done. The samples were examined by scanning electron microscopy (SEM). The roughness data were analyzed by ANOVA and there was no significant difference among groups and among time intervals. The corrosion data (i corr) were analyzed by the Mann-Whitney test, and significant differences were found between GA and GC, GB and GC, GC and GD, GC and GE. SEM micrographs showed that the titanium surface exposed to NaF presented corrosion that varied with the different concentrations. This study suggests that the use of 0.05% NaF solution on cpTi is safe, whereas the 0.2% NaF solution should be carefully evaluated with regard to its daily use.

scholarly journals Retention Strength of Cobalt-Chromium vs Nickel-Chromium Titanium vs CP Titanium in a Cast Framework Association of Removable Partial Overdenture

2011 ◽  
Vol 12 (3) ◽  
pp. 179-186
Author(s):  
Adriana Cristina Zavanelli ◽  
Recardo Alexandre Zavanelli ◽  
José Everaldo de Aquino Souza ◽  
Nelson Renato França Alves da Silva ◽  
Paulo Guilherme Coelho ◽  
...  
Keyword(s):  
Potential Risk ◽  
Artificial Saliva ◽  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
Cobalt Chromium ◽  
Nickel Chromium ◽  
Commercially Pure ◽  
Significant Difference ◽  
Retention Strength

ABSTRACT Aim There is little information considering the framework association between cast clasps and attachments. The aim of this study was to evaluate the retention strength of frameworks match circumferential clasps and extra resilient attachment cast in three different alloys (cobalt-chromium, nickel-chromium titanium and commercially pure titanium), using two undercut (0.25 and 0.75 mm) and considering different period of time (0, 1/2, 1, 2, 3, 4 and 5 years). Methods Using two metallic matrices, representing a partially edentulous mandibular right hemiarch with the first molar crown, canine root and without premolars, 60 frameworks were fabricated. Three groups (n = 20) of each metal were cast and each group was divided into two subgroups (n = 10), corresponding the molar undercut of 0.25 mm and 0.75 mm. The nylon male was positioned at the matrix and attached to the acrylic resin of the prosthetic base. The samples were subjected to an insertion and removal test under artificial saliva environment. Results The data were analyzed and compared with ANOVAs and Tukey's test at 95% of probability. The groups cast in cobaltchromium and nickel-chromium-titanium had the highest mean retention strength (5.58 N and 6.36 N respectively) without significant difference between them, but statistically different from the group cast in commercially pure titanium, which had the lowest mean retention strength in all the periods (3.46 N). The association frameworks using nickel-chromium- titanium and cobalt-chromium could be used with 0.25 mm and 0.75 mm of undercut, but the titanium samples seems to decrease the retention strength, mainly in the 0.75 mm undercut. The circumferential clasps cast in commercially pure titanium used in 0.75 mm undercuts have a potential risk of fractures, especially after the 2nd year of use. Conclusion This in vitro study showed that the framework association between cast clasp and an extra resilient attachment are suitable to the three metals evaluated, but strongly suggest extra care with commercially pure titanium in undercut of 0.75 mm. Clinical significance Frameworks fabricated in Cp Ti tend to decrease in retentive strength over time and have a potential risk of fracture in less than 0.75 mm of undercut. How to cite this article Souza JEdA, da Silva NRFA, Coelho PG, Zavanelli AC, Ferracioli RCSR, Zavanelli RA. Retention Strength of Cobalt-Chromium vs Nickel-Chromium Titanium vs CP Titanium in a Cast Framework Association of Removable Partial Overdenture. J Contemp Dent Pract 2011;12(3):179-186.

Stress-relieving and porcelain firing cycle influence on marginal fit of commercially pure titanium and titanium–aluminum–vanadium copings

2003 ◽  
Vol 19 (7) ◽  
pp. 686-691 ◽  
Author(s):  
Johnson Campideli Fonseca ◽  
Guilherme Elias Pessanha Henriques ◽  
Lourenço Correr Sobrinho ◽  
Mário Fernando de Góes
Keyword(s):  
Pure Titanium ◽  
Firing Cycle ◽  
Commercially Pure Titanium ◽  
Marginal Fit ◽  
Porcelain Firing ◽  
Commercially Pure ◽  
Stress Relieving ◽  
Titanium Aluminum ◽  
Titanium Aluminum Vanadium

Histological and Histomorphometric Studies of the Effects of Hyaluronic Acid on Osseointegration of Titanium Implant in Rabbits

2018 ◽  
Vol 30 (2) ◽  
pp. 10-16
Author(s):  
Mohammad Hasan Mohammad ◽  
Nada M. H. Al-Ghaban
Keyword(s):  
Hyaluronic Acid ◽  
Bone Formation ◽  
Healing Process ◽  
Pure Titanium ◽  
Titanium Implant ◽  
Commercially Pure Titanium ◽  
Histomorphometric Analysis ◽  
Natural Polymers ◽  
Commercially Pure ◽  
Significant Difference

Background: One of the unique prosthesis for tooth or teeth replacement is the dental implant. Our attempt is using a biomaterial system that is easily obtained and applicable and has the ability to provoke osteoinductive growth factor to enhance bone formation at the site of application. One of these natural polymers is hyaluronic acid. Material and methods: Sixty machined surface implants from commercially pure titanium rod inserted in thirty NewZealand rabbits. Two implants placed in both tibia of each rabbit. The animals scarified at 1, 2 and 4 weeks after implantation (10 rabbits for each interval). For all of animals the right tibia’s implant was control (uncoated) and the left one was experimental (coated with 0.1ml Hyaluronic acid gel). All sections have been stained with Haematoxylin and Eosin then they were histologically examined and assessed for histomorphometric analysis for counting of bone cells (osteoblast, osteocyte and osteoclast), cortical bone thickness, trabecular width, thread width and marrow space star volume (V*). Results: Histological findings for hyaluronic acid- coated titanium implant revealed an earlier bone formation, mineralization and maturation than that in control groups. Histomorphometric analysis for all bone parameters that examined in this study, showed highly significant difference between control and experimental groups in all healing intervals. Conclusion: Commercially pure titanium endosseous implants coated with hyaluronic acid may be osteocoductive thus accelerating healing process and enhancing osseointegration.

scholarly journals Effect of fluoride-containing solutions on the surface of cast commercially pure titanium

2009 ◽  
Vol 20 (3) ◽  
pp. 201-204 ◽  
Author(s):  
Marcelo Bighetti Toniollo ◽  
Rodrigo Tiossi ◽  
Ana Paula Macedo ◽  
Renata Cristina Silveira Rodrigues ◽  
Ricardo Faria Ribeiro ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Pure Titanium ◽  
Distilled Water ◽  
Commercially Pure Titanium ◽  
Group 4 ◽  
Commercially Pure ◽  
Significant Difference ◽  
Group 5 ◽  
Group 2 ◽  
Cp Ti

This study evaluated the effects of fluoride-containing solutions on the surface of commercially pure titanium (CP Ti) obtained by casting. CP Ti specimens were fabricated and randomly assigned to 5 groups (n=10): group 1: stored in distilled water at 37 ± 1ºC; group 2: stored in distilled water at 37 ± 1ºC and daily immersed in 0.05% NaF for 3 min; group 3: stored in distilled water at 37 ± 1ºC and daily immersed in 0.2% NaF for 3 min; group 4: stored in distilled water at 37 ± 1ºC; and immersed in 0.05% NaF every 15 days for 3 min; and group 5: stored in distilled water at 37 ± 1ºC and immersed in 0.2% NaF every 15 days for 3 min. Surface roughness was measured with a profilometer immediately after metallographic polishing of the specimens (T0) and at 15-day intervals until completing 60 days of experiment (T15, T30, T45, T60). Data were analyzed statistically by ANOVA and Tukey's test (α=0.05). There was no statistically significant difference (p>0.05) in surface roughness among the solutions. In conclusion, fluoride-containing solutions (pH 7.0) used as mouthwashes do not damage the surface of cast CP Ti and can be used by patients with titanium-based restorations.

Histological and histomorphometric studies of the effects of hyaluronic acid on osseointegration of titanium implant in rabbits

2018 ◽  
Vol 30 (2) ◽  
pp. 10-16
Author(s):  
Mohammad H. Mohammad ◽  
Nada M.H. Al Ghaban
Keyword(s):  
Hyaluronic Acid ◽  
Bone Formation ◽  
Healing Process ◽  
Pure Titanium ◽  
Titanium Implant ◽  
Commercially Pure Titanium ◽  
Histomorphometric Analysis ◽  
Natural Polymers ◽  
Commercially Pure ◽  
Significant Difference

Background: One of the unique prosthesis for tooth or teeth replacement is the dental implant. Our attempt is using a biomaterial system that is easily obtained and applicable and has the ability to provoke osteoinductive growth factor to enhance bone formation at the site of application. One of these natural polymers is hyaluronic acid. Material and methods: Sixty machined surface implants from commercially pure titanium rod inserted in thirty NewZealand rabbits. Two implants placed in both tibia of each rabbit. The animals scarified at 1, 2 and 4 weeks after implantation (10 rabbits for each interval). For all of animals the right tibia’s implant was control (uncoated) and the left one was experimental (coated with 0.1ml Hyaluronic acid gel). All sections have been stained with Haematoxylin and Eosin then they were histologically examined and assessed for histomorphometric analysis for counting of bone cells (osteoblast, osteocyte and osteoclast), cortical bone thickness, trabecular width, thread width and marrow space star volume (V*). Results: Histological findings for hyaluronic acid- coated titanium implant revealed an earlier bone formation, mineralization and maturation than that in control groups. Histomorphometric analysis for all bone parameters that examined in this study, showed highly significant difference between control and experimental groups in all healing intervals. Conclusion: Commercially pure titanium endosseous implants coated with hyaluronic acid may be osteocoductive thus accelerating healing process and enhancing osseointegration.

An Inverted Observation Technique for Interactions Between Titanium Oxide and Cells on Commercially Pure Titanium

2006 ◽  
Vol 309-311 ◽  
pp. 363-366 ◽  
Author(s):  
Akira Watazu ◽  
Kay Teraoka ◽  
Hirofumi Kido ◽  
Kae Okamatsu ◽  
Yoshiyuki Nagashima ◽  
...  
Keyword(s):  
Thin Films ◽  
Tissue Culture ◽  
Titanium Oxide ◽  
Pure Titanium ◽  
Optical Microscope ◽  
Commercially Pure Titanium ◽  
Titanium Film ◽  
Dc Sputtering ◽  
Commercially Pure ◽  
Titanium Thin Films

Commercially pure titanium thin films were uniformly formed on inner surfaces of tissue culture dishes by DC sputtering method. Then, the thickness of the film was about 30nm and the films were thin titanium oxide layer on commercially pure titanium. MC3T3-E1 cells were normally cultured on the dishes. Then, The films on the dishes were not broken and did not decompose. After 24 hours, observations of the sample from the direction of the cells' bottom surfaces adhered the titanium oxide on the commercially pure titanium film by an inverted optical microscope succeeded. Therefore, the new technique is useful for observations the interactions between titanium oxide and cells.

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