Evaluation of material waste, dimensional stability, and detail reproduction of polyvinyl siloxane impression materials mixed with different mixing tips

Maluly-Proni, Ana Teresa; Délben, Juliana Aparecida; Briso, André Luiz Fraga; Marson, Fabiano Carlos; Santos, Paulo Henrique dos

doi:10.1016/j.prosdent.2020.11.024

Cited by 3 publications

(9 citation statements)

References 10 publications

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“…In that study, when the T-Mixer mixing tip was used, the amount of waste material was, on average, 27% lower than when the conventional Helical mixing tip was used. 19 Regarding the color change, no significant differences were observed when comparing both mixing tips. This observation can be attributed to the fact that the entire bleaching procedure was conducted by one calibrated and experienced operator, ensuring that the same amount of gel was used for both mixing tips during the process, thereby explaining the similar color change achieved regardless of the mixing tip used.…”

Section: Discussionmentioning

confidence: 91%

“…On the other hand, the T‐mixer mixing tip, although shorter in length (Figure 1), allows for a permanent compressing and elongating of the fluid elements due to the shear stresses caused by radial velocity gradients. Additionally, the flow in the T‐mixer is divided into halves between two alternating elements 17–19 …”

Section: Discussionmentioning

confidence: 99%

“…Additionally, the flow in the T-mixer is divided into halves between two alternating elements. [17][18][19] Taking these differences into account, it appears that the Helical mixing tip produces a bleaching gel with higher oscillations of viscosity, resulting in a bleaching gel with heterogeneous behavior. This increased fluidity of the PO+ gel during application negatively impacts the higher amount of hydrogen peroxide that enters the pulp chamber, as observed in the present study.…”

Section: Discussionmentioning

confidence: 99%

“…The commonly used Helical mixing tip (Figure 1) has its limitations due to its length and potential waste during manipulation. A novel internal design, the T‐mixer mixing tip (Figure 1), 17,18 was recently developed and has already been employed in polyvinyl siloxane impression materials 19 . This design optimizes fluid element rearrangement within the mixer geometry, 17,18 resulting in a more efficient mixing process, despite having the same number of elements as the Helical mixing tip but with a considerably shorter length 19 …”

Section: Introductionmentioning

confidence: 99%

“…19 This design optimizes fluid element rearrangement within the mixer geometry, 17,18 resulting in a more efficient mixing process, despite having the same number of elements as the Helical mixing tip but with a considerably shorter length. 19 The efficiency of the T-mixer mixing tip suggests a potential reduction in the gel's required amount. A recent study demonstrated that inoffice bleaching gels used with an applicator brush in combination with a Helical mixing tip reduce hydrogen peroxide reaching the pulp chamber.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of hydrogen peroxide permeability, color change, and physical–chemical properties on the in‐office dental bleaching with different mixing tip

Favoreto,

Parreiras,

Wendlinger

et al. 2023

J Esthet Restor Dent

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ObjectiveThis study aims to assess hydrogen peroxide (HP) penetration into the pulp chamber, color change (CC), physical–chemical properties, and material wastage (MW) and material used (MU) in mixing tips when using in‐office bleaching gels with two different mixing tips.Materials and MethodsForty teeth were divided into five groups (n = 8) based on the bleaching gels used (Pola Office +37.5% [PO+] and Whiteness HP Automixx Plus 35% [AM+]) and the mixing tip types (T‐Mixer and Helical). A negative control group was treated with ultra‐purified water. HP concentration was measured using UV–Vis, and CC was evaluated with a digital spectrophotometer. Initial concentration, pH, and viscosity were measured through Titration, a Digital pH meter, and Rheometer, respectively. MW and MU were measured using a precise analytical balance. Statistical analysis included two‐way ANOVA, Tukey's, and Dunnett's test (α = 0.05).ResultsA higher HP concentration was observed with PO+ with the Helical mixing tip in comparison with AM+ (p = 0.01). No significant differences in CC or MU were found for different mixing tips (p = 0.001). The T‐mixer mixing tip resulted in significantly less MW (p < 0.00001) and improved mixture homogeneity and viscosity.ConclusionsUtilizing a T‐mixer with self‐mixing bleaching gels achieves comparable CC while reducing MW. Moreover, it decreases HP penetration when using PO+.Clinical SignificanceFor the application of a self‐mixing in‐office bleaching gel, a T‐mixer mixing tip should be recommended, as it reduces the penetration of hydrogen peroxide into the pulp chamber when using PO+, while also minimizing gel wastage.

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Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Evaluation of hydrogen peroxide permeability, color change, and physical–chemical properties on the in‐office dental bleaching with different mixing tip

Favoreto,

Parreiras,

Wendlinger

et al. 2023

J Esthet Restor Dent

View full text Add to dashboard Cite

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Die erfolgreiche Präzisionsabformung – ein Überblick

Boehm,

Bömicke

2024

wissen kompakt

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A Methodological Approach for Motor Selection in Dental Impression Material Dispensers Using Experimental and Image Analysis Techniques

Hwang,

Park,

Jeong

et al. 2024

Materials

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This study presents a methodology to prevent the overdesign of electric dispensers for dental impression materials by analyzing the necessary load and determining the appropriate pressurization speed and drive motor capacity. We derived an equation to calculate the required torque and rotational speed of the motor based on the extrusion load and the speed of the impression material. A specialized load measurement system was developed to measure the load necessary to extrude the impression material. Through experiments and image processing, we measured the radius of curvature of the trajectory of the impression material and correlated it with the pressurization speed. Techniques such as position coordinate plotting, curve fitting, and circle fitting were employed to determine the pressurization speed that aligns with the manufacturer’s recommended curvature radius. These findings led to a substantial decrease in the necessary motor torque and rotational speed compared with the current standards. This research provides a systematic approach to sizing drive motors using extrusion load and pressurization speed, aiming to reduce overdesign, power consumption, and the weight and size of the motor and battery, thereby contributing to the development of more efficient and compact dental impression material dispensers.

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Evaluation of material waste, dimensional stability, and detail reproduction of polyvinyl siloxane impression materials mixed with different mixing tips

Cited by 3 publications

References 10 publications

Evaluation of hydrogen peroxide permeability, color change, and physical–chemical properties on the in‐office dental bleaching with different mixing tip

Evaluation of hydrogen peroxide permeability, color change, and physical–chemical properties on the in‐office dental bleaching with different mixing tip

Die erfolgreiche Präzisionsabformung – ein Überblick

A Methodological Approach for Motor Selection in Dental Impression Material Dispensers Using Experimental and Image Analysis Techniques

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