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Start Over Descriptor "Typodont" Publisher biomed central
3 results on '"Typodont"'

2. Robot and mechanical testing of a specialist manual toothbrush for cleaning efficacy and improved force control.

Author

Acherkouk, Amina, Götze, Marco, Kiesow, Andreas, Ramakrishnan, Anantha, Sarembe, Sandra, Lang, Tomas, and Gaengler, Peter

Subjects
TOOTHBRUSHES, ORAL hygiene, DENTAL plaque, PHYSICAL therapy, ROBOTICS, PRODUCT design, COMPARATIVE studies, DENTAL casting, COMMERCIAL product evaluation, ELECTRIC stimulation, DESCRIPTIVE statistics, MOUTH
Abstract

Background: Toothbrushes require flexibility to access all dental surfaces and remove plaque effectively, but they should also aim to prevent or limit overbrushing and consequent damage to teeth and gums. In two studies, the physical properties and cleaning performance of specialist test toothbrushes with flexible necks were compared to a reference rigid-necked toothbrush. Methods: In Study 1, a universal testing machine (Instron E 10,000) with a specially designed setup was used to test the deflection behaviour of toothbrush head and neck. Untufted toothbrushes were fixed in a custom holder and force was applied to the head while the deflection was measured. In Study 2, one control and five test toothbrushes were assessed using a robot system to simulate the cleaning of artificial plaque from defined surfaces of artificial replicated human teeth in a model oral cavity (typodonts). Results: Study 1 showed that the flexible-neck toothbrush deflected 2 to 2.5 times more than the rigid-neck reference toothbrush when same force was applied to the toothbrush head. Study 2 revealed that all five test toothbrushes showed statistically superior simulated plaque removal to the reference toothbrush. This superiority was observed for all test toothbrushes employing horizontal and rotating brushing action (all p = 0.001) but only three of the five toothbrushes when vertical brushing was employed (all p = 0.001). Cleaning efficacy of the test toothbrushes was demonstrated both interdentally and at the gumline locations. The Complete Protection toothbrush showed the most effective cleaning performance followed by the Repair and Protect and Rapid Relief toothbrushes. Conclusion: The addition of a flexible-neck component to the toothbrush designs helped to reduce stiffness and may allow more effective cleaning compared to rigid designs with controlled force distribution on the teeth and gums. This may help to provide plaque control at all potential risk areas in an in vitro robot model and could support good oral hygiene in-use. [ABSTRACT FROM AUTHOR]

Published
2022
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3. Comparison of marginal fit of cemented zirconia copings manufactured after digital impression with lava™ C.O.S and conventional impression technique

Author

Andreas Moritz, Tina Rybaczek, Alexander Franz, Rinet Dauti, Uwe Yacine Schwarze, Bledar Lilaj, and Barbara Cvikl

Subjects
Dental Impression Technique, Scanning electron microscope, Digital impression, 610 Medicine & health, law.invention, Marginal gap, 03 medical and health sciences, Random Allocation, 0302 clinical medicine, Optical microscope, law, Medicine, Humans, 030212 general & internal medicine, Composite material, General Dentistry, Orthodontics, Typodont, Coping (architecture), Crowns, Dentistry(all), business.industry, 030206 dentistry, Dental Marginal Adaptation, Zirconia copings, Lava C.O.S, Impression, Polyvinyl siloxane, Dental Prosthesis Design, Computer-Aided Design, Zirconium, business, Research Article
Abstract

Background Evaluation of the marginal fit of cemented zirconia copings manufactured after digital impression with Lava™ Chairside Oral Scanner in comparison to that of zirconia copings manufactured after conventional impressions with polyvinyl siloxane. Methods A prepared typodont tooth #36, was replicated 40 times with a vinyl silicone and precise model resin. The dies were randomly divided into two groups according to the impression taking technique. Digital impressions with Lava™ C.O.S. and conventional impressions were taken according to the group. Subsequently zirconia copings were manufactured and cemented on their respective dies with zinc oxide phosphate cement. After embedding in resin, mesio-distal section of each coping was performed with a diamond saw in order to obtain two slices. One half of the specimen was used for evaluation with an optical microscope (OM) and the other half for evaluation with a scanning electron microscope (SEM). Marginal gap (MG) and absolute marginal discrepancy (AMD) were measured mesial and distal on each slice. Results No significant difference of the marginal parameters between the digital and the conventional group was found. The mean values for MG in the digital group were 96.28 μm (+/−43.21 μm) measured with the OM and 99.26 μm (+/−48.73 μm) measured with the SEM, respectively. AMD mean values were 191.54 μm (+/−85.42 μm) measured with the optical microscope and 211.6 μm (+/−96.55 μm) with the SEM. For the conventional group the mean MG values were 94.84 μm (+/−50.77 μm) measured with the OM and 83.37 μm (+/−44.38 μm) measured with the SEM, respectively. AMD mean values were 158.60 μm (+/−69.14 μm) for the OM and 152.72 μm (+/−72.36) for the SEM. Conclusions Copings manufactured after digital impression with Lava™ C.O.S. show comparable marginal parameters with the copings manufactured after conventional impression with polyvinyl syloxane. The mean MG values of both groups fit in the clinically acceptable range. Electronic supplementary material The online version of this article (doi:10.1186/s12903-016-0323-8) contains supplementary material, which is available to authorized users.

Published
2016
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