- Email: [email protected]
CAM composite resin blocks
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d e n t a l m a t e r i a l s 3 2 S ( 2 0 1 6 ) e1–e103
and by two methods: incremental or bulk filling technique. The specimens were measured for cavity wall compliance and micro-tensile bond strength (-TBS) to the cavity floor. The polymerization stresses of the composites (TB and VB) were gauged with a custom-made device. The results were statistically analyzed using a Kruskal–Wallis test followed by Mann–Whitney U test. The -TBS data were also analyzed by Weibull analysis. Results: In group I, the -TBS by incremental technique was significantly higher than that by bulk fill technique (p < 0.05). In group II and III, there was no difference by the two techniques. The -TBS measured in group I turned out to be lower than that in group II or III (p < 0.05). The polymerization stress of TB and VB was different, however, no statistical difference was found in -TBS when it was filled with either TB or VB (p > 0.05). Conclusions: In high the C-factor cavity, there was a difference between the incremental and bulk-filling technique in bonding strength on the cavity floor. In the low C-factor cavity, there was no difference between them. The bond strength in the high C-factor cavity was significantly lower than that in the low C-factor cavity.
was determined using an aluminum thickness-radiopacity plot. The sizes of artifact and aluminum equivalent thickness were analyzed with one-way ANOVA and Tukey’s multiple comparisons. Results: The size of MRI artifacts at the crown top portion of CAD/CAM blocks and CRCB were 10.1–10.7 mm and 9.9–13.1 mm, respectively; those at the axial portion of CAD/CAM blocks and CRCB were 9.7–9.8 mm and 9.5–9.8 mm, respectively. One-way ANOVA revealed that the sizes of MRI artifacts at the crown top were not significantly different but those at the axial portion were not. The MRI artifacts of CAD/CAM blocks did not cause severe problem, but those of CRCB did show a slight disturbance. The aluminum equivalent thicknesses of CAD/CAM blocks and CRCB components were 0.01–2.11 mm and −0.05 to 2.95 mm, respectively. The radiopacities of CAD/CAM composite resin blocks were significantly different among products. The products with greater radiopacity did not show a greater MRI artifact. Conclusions: Comparing CBCR, CAD/CAM composite resin blocks did not show severe MRI artifact, but their radiopacities varied among products.
http://dx.doi.org/10.1016/j.dental.2016.08.046
http://dx.doi.org/10.1016/j.dental.2016.08.047
46
47
MRI artifacts and radiopacity of CAD/CAM composite resin blocks
Effect of CAD/CAM fabricated framework on complete denture deformation
Y. Nakajima 1,∗ , N. Iwasaki 1 , H. Takahashi 1 , M. Yoshida 2 , E. Honda 2 , T. Kurabayashi 1
T. Hada 1,∗ , H. Takahashi 1 , S. Kamijo 1 , M. Ikeda 1 , T. Kitamura 2 , S. Higuchi 3 , T. Suzuki 1
1
1
2
Tokyo Medical and Dental University, Japan Tokushima University, Japan
Purpose/Aim: Recently several CAD/CAM composite resin block have been introduced. However, MRI artifacts and radiopacity of CAD/CAM composite resin blocks have not been clearly elucidated. The aim of the present study was to evaluate MRI artifacts and radiopacity of CAD/CAM composite resin blocks comparing composite resin for fabrication of crown and bridge (CRCB). Materials and methods: Four CAD/CAM composite resin blocks (Cerasmart, GC; Estelite Block, Tokuyama Dental; Katana Avencia, Kuraray Noritake Dental; KZR HR2, Yamamoto Precious Metal) and 4 composite resin systems for fabrication of crown and bridge. (Estenia, Kuraray Noritake Dental; Gradia Fort, GC; Pearl Este, Tokuyama Dental; Symphony, 3 M ESPE) were examined. Six crown-shaped specimen (8.0 mm in outer diameter, 8.0 mm in height, 5.0 mm in inner diameter, 6.0 mm in inner depth) of each material were prepared according manufacturer’s instructions. Specimens were placed in water tank and transverse images with a 2.5-mm slice thickness were acquired using 3T MRI scanner. The artifacts of images by turbo-spin echo and gradient echo sequences were determined using image process and analyzing software (Image J). Five disc-shaped specimens, 5.0 mm in diameter and 1.0 mm in thickness of each component of each system were prepared. An x-ray image of each specimen with an aluminum step wedge from 0.5 to 6.0 mm in steps of 0.5 mm was obtained by intraoral X-ray apparatus and imaging plate. An aluminum equivalent thickness
Tokyo Medical and Dental University, Japan Shofu Inc., Japan 3 Wada Precision Dental Lab. Co., Ltd., Japan 2
Purpose/Aim: Recently several CAD/CAM systems have been available to fabricate a denture framework using various materials, however, their efficiencies of these framework have not been clearly elucidated. In this study, effects of CAD/CAM fabricated framework on the complete denture deformation during loading were evaluated. Materials and methods: Four types of the maxillary denture were prepared with and without a denture framework (0.5-mm thickness). Group 1: conventional denture with a palatal plate thickness of 1 mm (without denture framework) (Cont), Group 2: denture with a milled fiberglass reinforced plastic (FRP) (TRINIA, Bicon) framework, Group 3: denture with a milled zirconia (C-Pro Nano-Zr, Panasonic Healthcare) framework, Group 4: denture with laser sintered Co-Cr (SP2, EOS) framework. These frameworks were fabricated with corresponding CAD/CAM system using the same STL files. The framework was located not to cover incisive papilla and upper lip frenulum. The complete denture was processed using an injection molding technique (Fit denture system, Shofu). Three strain gauges were cemented onto the mid-line of oral surface in each denture; incisive papilla (IP), end point of the denture (EP) and middle point (MP) between IP and EP. An occlusal load was applied by a universal-testing machine at a loading rate of 20 N/s to 200 N. The load and strain were recorded through sensor interface to a personal computer, and the maximum principle stress (MPS) was calculated. The MPSs at 200-N load
d e n t a l m a t e r i a l s 3 2 S ( 2 0 1 6 ) e1–e103
and by two methods: incremental or bulk filling technique. The specimens were measured for cavity wall compliance and micro-tensile bond strength (-TBS) to the cavity floor. The polymerization stresses of the composites (TB and VB) were gauged with a custom-made device. The results were statistically analyzed using a Kruskal–Wallis test followed by Mann–Whitney U test. The -TBS data were also analyzed by Weibull analysis. Results: In group I, the -TBS by incremental technique was significantly higher than that by bulk fill technique (p < 0.05). In group II and III, there was no difference by the two techniques. The -TBS measured in group I turned out to be lower than that in group II or III (p < 0.05). The polymerization stress of TB and VB was different, however, no statistical difference was found in -TBS when it was filled with either TB or VB (p > 0.05). Conclusions: In high the C-factor cavity, there was a difference between the incremental and bulk-filling technique in bonding strength on the cavity floor. In the low C-factor cavity, there was no difference between them. The bond strength in the high C-factor cavity was significantly lower than that in the low C-factor cavity.
was determined using an aluminum thickness-radiopacity plot. The sizes of artifact and aluminum equivalent thickness were analyzed with one-way ANOVA and Tukey’s multiple comparisons. Results: The size of MRI artifacts at the crown top portion of CAD/CAM blocks and CRCB were 10.1–10.7 mm and 9.9–13.1 mm, respectively; those at the axial portion of CAD/CAM blocks and CRCB were 9.7–9.8 mm and 9.5–9.8 mm, respectively. One-way ANOVA revealed that the sizes of MRI artifacts at the crown top were not significantly different but those at the axial portion were not. The MRI artifacts of CAD/CAM blocks did not cause severe problem, but those of CRCB did show a slight disturbance. The aluminum equivalent thicknesses of CAD/CAM blocks and CRCB components were 0.01–2.11 mm and −0.05 to 2.95 mm, respectively. The radiopacities of CAD/CAM composite resin blocks were significantly different among products. The products with greater radiopacity did not show a greater MRI artifact. Conclusions: Comparing CBCR, CAD/CAM composite resin blocks did not show severe MRI artifact, but their radiopacities varied among products.
http://dx.doi.org/10.1016/j.dental.2016.08.046
http://dx.doi.org/10.1016/j.dental.2016.08.047
46
47
MRI artifacts and radiopacity of CAD/CAM composite resin blocks
Effect of CAD/CAM fabricated framework on complete denture deformation
Y. Nakajima 1,∗ , N. Iwasaki 1 , H. Takahashi 1 , M. Yoshida 2 , E. Honda 2 , T. Kurabayashi 1
T. Hada 1,∗ , H. Takahashi 1 , S. Kamijo 1 , M. Ikeda 1 , T. Kitamura 2 , S. Higuchi 3 , T. Suzuki 1
1
1
2
Tokyo Medical and Dental University, Japan Tokushima University, Japan
Purpose/Aim: Recently several CAD/CAM composite resin block have been introduced. However, MRI artifacts and radiopacity of CAD/CAM composite resin blocks have not been clearly elucidated. The aim of the present study was to evaluate MRI artifacts and radiopacity of CAD/CAM composite resin blocks comparing composite resin for fabrication of crown and bridge (CRCB). Materials and methods: Four CAD/CAM composite resin blocks (Cerasmart, GC; Estelite Block, Tokuyama Dental; Katana Avencia, Kuraray Noritake Dental; KZR HR2, Yamamoto Precious Metal) and 4 composite resin systems for fabrication of crown and bridge. (Estenia, Kuraray Noritake Dental; Gradia Fort, GC; Pearl Este, Tokuyama Dental; Symphony, 3 M ESPE) were examined. Six crown-shaped specimen (8.0 mm in outer diameter, 8.0 mm in height, 5.0 mm in inner diameter, 6.0 mm in inner depth) of each material were prepared according manufacturer’s instructions. Specimens were placed in water tank and transverse images with a 2.5-mm slice thickness were acquired using 3T MRI scanner. The artifacts of images by turbo-spin echo and gradient echo sequences were determined using image process and analyzing software (Image J). Five disc-shaped specimens, 5.0 mm in diameter and 1.0 mm in thickness of each component of each system were prepared. An x-ray image of each specimen with an aluminum step wedge from 0.5 to 6.0 mm in steps of 0.5 mm was obtained by intraoral X-ray apparatus and imaging plate. An aluminum equivalent thickness
Tokyo Medical and Dental University, Japan Shofu Inc., Japan 3 Wada Precision Dental Lab. Co., Ltd., Japan 2
Purpose/Aim: Recently several CAD/CAM systems have been available to fabricate a denture framework using various materials, however, their efficiencies of these framework have not been clearly elucidated. In this study, effects of CAD/CAM fabricated framework on the complete denture deformation during loading were evaluated. Materials and methods: Four types of the maxillary denture were prepared with and without a denture framework (0.5-mm thickness). Group 1: conventional denture with a palatal plate thickness of 1 mm (without denture framework) (Cont), Group 2: denture with a milled fiberglass reinforced plastic (FRP) (TRINIA, Bicon) framework, Group 3: denture with a milled zirconia (C-Pro Nano-Zr, Panasonic Healthcare) framework, Group 4: denture with laser sintered Co-Cr (SP2, EOS) framework. These frameworks were fabricated with corresponding CAD/CAM system using the same STL files. The framework was located not to cover incisive papilla and upper lip frenulum. The complete denture was processed using an injection molding technique (Fit denture system, Shofu). Three strain gauges were cemented onto the mid-line of oral surface in each denture; incisive papilla (IP), end point of the denture (EP) and middle point (MP) between IP and EP. An occlusal load was applied by a universal-testing machine at a loading rate of 20 N/s to 200 N. The load and strain were recorded through sensor interface to a personal computer, and the maximum principle stress (MPS) was calculated. The MPSs at 200-N load