Measurement of Load in Tooth-grindig

Yuzuriha, Masayuki; Itoh, Akihiko; Satoh, Yoshiteru; Murakami, Shigeki; Uchida, Yasunari

doi:10.2504/kds.41.555

Cited by 3 publications

(2 citation statements)

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“…One earlier study evaluating cutting resistance determined a combined load of approximately 60 to 100 g for the three directions applied during grinding using a 3-D measuring load 18) , while another report noted a mean cutting pressure in the vertical direction of 30.4±12.9 g and a maximum cutting pressure of ≤100 g 22) .…”

Section: Load and Feed Ratementioning

confidence: 99%

Grinding Efficiency of Abutment Tooth with Both Dentin and Core Composite Resin on Axial Plane

Miho

Satô

Mutoh

2015

Bull. Tokyo Dent. Coll.

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The purpose of this study was to evaluate grinding efficiency in abutment teeth comprising both dentin and core composite resin in the axial plane. Grinding was performed over 5 runs at two loads (0.5 or 0.25 N) and two feed rates (1 or 2 mm/sec). The grinding surface was observed with a 3-D laser microscope. Tomographic images of the grinding surfaces captured perpendicular to the feed direction were also analyzed. Using a non-ground surface as a reference, areas comprising only dentin, both dentin and core composite resin, or only core composite resin were analyzed to determine the angle of the grinding surface. Composite resins were subjected to the Vickers hardness test and scanning electron microscopy. Data were statistically analyzed using a one-way analysis of variance and multiple comparison tests. Multiple regression analysis was performed for load, feed rate, and Vickers hardness of the build-up material depending on number of runs. When grinding was performed at a constant load and feed rate, a greater grinding angle was observed in areas comprising both dentin and composite resin or only composite resin than in areas consisting of dentin alone. A correlation was found between machinability and load or feed rate in areas comprising both dentin and composite resin or composite resin alone, with a particularly high correlation being observed between machinability and load. These results suggest that great caution should be exercised in a clinical setting when the boundary between the dentin and composite resin is to be ground, as the angle of the grinding surface changes when the rotating diamond point begins grinding the composite resin.

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Section: Load and Feed Ratementioning

confidence: 99%

Grinding Efficiency of Abutment Tooth with Both Dentin and Core Composite Resin on Axial Plane

Miho

Satô

Mutoh

2015

Bull. Tokyo Dent. Coll.

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“…The prosthodontist was trained to grind with a contact pressure of 0.49–0.69 N, which was the average contact pressure applied by three prosthodontists (average relevant work experience: 10.3 years) in the free grinding of the metal crown's approximal surface without notice in a preliminary experiment. Furthermore, previous reports did not identify the force applied when adjusting the metal crown's approximal surface, and the grinding contact pressure was determined with reference to reports showing that the formation of living teeth by skilled dentists ranged from 0.49 N to 0.98 N. 21 A laser particle counter (suction flow rate: 2.83 L/min; MODEL 3889, KANOMAX) was used to measure PMNs of six different sizes (0.3, 0.5, 1.0, 3.0, 5.0, and 10.0 μm in diameter). Although the particles had diameters of ≥5 μm, which are widely distributed over the long term, we focused on the smaller particle diameters of 0.3, 0.5, 1.0, and 3.0 μm, which are considered more harmful to the human body.…”

Section: Methodsmentioning

confidence: 99%

Effective use of an extraoral vacuum in preventing the dispersal of particulate matter from metal dental materials

Suito

Fujimoto

Goto

et al. 2023

Journal of Occupational Health

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ObjectivesWhen dentists adjust prostheses at the dental chairside, particulate matter (PM) from the dental material is dispersed. Little is known about the effective use of an extraoral vacuum (EOV) in preventing PM dispersal. This study aimed to evaluate the effective use of an EOV in preventing the dispersal of metal PM in dental offices.MethodsThe following experimental conditions were planned: the distance from the EOV to the metallic materials (50, 100, 150, and 200 mm), the horizontal angle between the long axis of the micromotor handpiece and EOV (0°, 45°, and 90°), and the operating time of the EOV (during grinding, during grinding and 1 min thereafter, during grinding and the preceding 1 min, 1 min before and after grinding, and during grinding). Carborundum and silicone points were used for grinding and PM dispersal. Diameters (0.3, 0.5, 1.0, and 3.0 μm) were measured using a laser particle counter.ResultsDepending on the instrument used to grind, there were undetectable PMs of different diameters (Carborundum point: 0.3 and 0.5 μm, Silicone point: 0.3 μm). PMNs were reduced as the distance from the EOV to metal materials decreased. Operating the EOV before grinding along the long axis of the micromotor handpiece was effective in reducing the PMNs.ConclusionPMNs dispersed when grinding metals were effectively reduced by positioning the EOV closer to the grinding surface (within 150 mm) along the long axis of the micromotor handpiece and operating the EOV before grinding.

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Effects of the Time of Abutment Preparation on the Pull-out Strength of Post and Core

Murata¹,

Uno²,

Tawada³

et al. 2010

Nihon Hotetsu Shika Gakkaishi

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The purpose of this study was to investigate the effects that the time of preparation within a range of four weeks had on the pull-out resistance strength after cementation. Materials and Methods: Abutments milled from SUS steel were placed and cemented into the cavities of extracted bovine roots with resin-modifi ed glass ionomer cement, and the pull-out resistance strength was measured up to 4 weeks. The examination periods were 0 minute, 30 minutes, 24 hours, 1 week, 2 weeks, 3 weeks, and 4 weeks. Preparation was conducted immediately after cementation as condition 1, and after each time period as condition 2. The pull-out resistance strength was measured after each time period following preparation as condition 1 IP , immediately after preparation at each time period as condition 2 BT , and after each time period following no preparation as a control NP. All the data obtained were subjected to statistical analysis. Results: While the pull-out resistance strength increased up to 4 weeks, the mean value at one week reached 95 of that at 4 weeks. The mean value of Group IP did not show signifi cant differences with Group NP by applying the conditions of various durations from cementation to preparation. There were signifi cant differences between Group BT and IP at all periods except for immediately, 30 minutes, and 4 weeks. Conclusion: To obtain satisfactory results for prosthodontic restorations with metal abutments, it is considered preferable that cementation and preparation be completed at the same visit, and that excessive stress on abutment teeth should be avoided as much as possible.

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Measurement of Load in Tooth-grindig

Cited by 3 publications

References 0 publications

Grinding Efficiency of Abutment Tooth with Both Dentin and Core Composite Resin on Axial Plane

Grinding Efficiency of Abutment Tooth with Both Dentin and Core Composite Resin on Axial Plane

Effective use of an extraoral vacuum in preventing the dispersal of particulate matter from metal dental materials

Effects of the Time of Abutment Preparation on the Pull-out Strength of Post and Core

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