In vitro investigations on retention force behavior of conventional and modern double crown systems

The retention force of cemented crowns on implant abutments with various luting materials was evaluated. Cobalt–chromium crowns were cemented onto tapered titanium abutments (Camlog) with eugenol-free temporary cement (RelyX TempBond NE), composite-based temporary cement (Bifix Temp), zinc phosphate cement (Harvard Cement), glass-ionomer cements (Meron, Fuji I), and resin-modified glass-ionomer cements (Fuji II, Fuji Plus, Ketac Cem Plus). Specimen aging via hydrostress was performed in artificial saliva at 37 °C for 14 days (S1), followed by hydrothermal stress with thermocycling (S2). The crowns were removed, and the force was recorded (T1). Subsequently, the crowns were recemented, aged, and removed, and the force was recorded (T2, T3). The retention forces differences were statistically significant according to the storage conditions at T1 (p = 0.002) and T3 (p = 0.0002). After aging (S1), Ketac Cem Plus had the highest retention force median value difference (T3 versus T1) (−773 N), whereas RelyX TempBond NE had the lowest (−146 N). After aging (S2), Meron had the highest retention force median value difference (−783 N), whereas RelyX TempBond NE had the lowest (−168 N). Recementation decreased the retention force of the implant-supported cobalt–chromium crowns cemented and recemented with the same luting materials. Luting materials (at T1) and aging conditions significantly impacted the retention force.

Download Full-text

Retention Forces of Prosthetic Clasps over a Simulated Wearing Period of Six Years In-Vitro: Direct Metal Laser Melting Versus Dental Casting

Materials ◽

10.3390/ma13235339 ◽

2020 ◽

Vol 13 (23) ◽

pp. 5339

Author(s):

Moritz Mutschler ◽

Florian Schweitzer ◽

Sebastian Spintzyk ◽

Jürgen Geis-Gerstorfer ◽

Fabian Huettig

Keyword(s):

Clinical Relevance ◽

Fatigue Behavior ◽

Molar Tooth ◽

Tooth Crown ◽

Laser Melting ◽

Dental Casting ◽

Retention Force ◽

Computer Aided ◽

Dental Application

This study determinates the persistence of retention force in Akers-clasps for removable partial dentures made from Co-Cr alloy. Therefore, standardized computer-aided designed (CAD) clasp #1 specimens were made by direct metal laser melting (DMLM, n = 10) and by lost-wax dental casting (DC) of computer-aided manufactured (CAM) replicas (n = 10, DC) from two comparable Co-Cr alloys. The retention force was tested after manufacturing for 9000 cycles of setting and removal from a molar tooth crown analog made from zirconia; simulating in-vitro a duration of six years in service. The first and last 360 cycles (T0 and T1, 3 months each) of all specimens were selected for comparison of retention forces between the materials. A constant decrease of 6% from the initial retention force (T0 = 4.86 N, SD = 0.077; T1 = 4.57 N, SD = 0.037) was detected at the DC specimens, and an increase of 4% in DMLM specimens (T0 = 5.69 N, SD = 0.078; T1 = 5.92 N, SD = 0.077); all differences were statistically significant (p < 0.0001). Even if these deviations are not of clinical relevance, further studies and applications should investigate the fatigue behavior of laser melted Co-Cr-alloys for dental application.

Download Full-text

Effect of clasp type and pullout location on clasp retention in different environment: In vitro study

European Journal of Dentistry ◽

10.4103/ejd.ejd_70_17 ◽

2017 ◽

Vol 11 (02) ◽

pp. 216-220 ◽

Cited By ~ 1

Author(s):

Bilal Mourshed ◽

Fuad Abdo Al-Sabri ◽

Nashwan Ahmed Qaed ◽

Nader Alaizari ◽

Hashem Motahir Al-Shamiri ◽

...

Keyword(s):

Statistical Analysis ◽

In Vitro Study ◽

Retentive Force ◽

Crosshead Speed ◽

Tukey Test ◽

Retention Force ◽

Test Models ◽

Molar Teeth ◽

One Way Anova

ABSTRACT Objective: The purpose of this study was to investigate the importance of pullout location and clasp types in two different environments to dislodge the clasp. Materials and Methods: Mandibular test models with natural premolars and molar teeth were used to test four types of clasp (each 12) (Akers, Rest plate Akers, Half and Half, and Ring clasp) with three different pullout location for each type (ring on the rest, loop on the saddle, and wax arising from both rests) in dry and natural fresh saliva environment. Each clasp was pulled out 10 times with a crosshead speed of 10 mm/min, and the force required to withdraw each was measured. Statistical Analysis Used: A one-way ANOVA and Tukey test were used. Results: The ring on the saddle pullout location has the highest retention force while ring on the rest was the lowest. In addition, ring clasp has the highest retention force. Conclusion: Clasp type and pullout location had a significant effect on the retentive force.

Download Full-text

Telescopic crowns: extra-oral and intra-oral retention force measurement -in vitro/in vivo correlation

Gerodontology ◽

10.1111/j.1741-2358.2011.00477.x ◽

2011 ◽

Vol 29 (2) ◽

pp. e340-e347 ◽

Cited By ~ 4

Author(s):

Stefan Bayer ◽

Helmut Stark ◽

Lina Gölz ◽

Ludger Keilig ◽

Dominik Kraus ◽

...

Keyword(s):

Force Measurement ◽

Retention Force

Download Full-text

An In Vitro Assessment of Retention Force for Implant‑Retained Overdentures Using All‑Polyetheretherketone, Zirconia, and Titanium Attachments

International Journal of Current Research and Review ◽

10.31782/ijcrr.2021.131428 ◽

2021 ◽

Vol 13 (14) ◽

pp. 75-78

Author(s):

Mahalakshmi Gujjalapudi ◽

Amit Kumar Verma ◽

Swaroopkumar M Magar ◽

Doddy Lokanathan Balaji ◽

Gagandeep Singh Dang ◽

...

Keyword(s):

Retention Force ◽

In Vitro Assessment

Download Full-text

In Vitro Evaluation of the Relationship between the Surface Properties and Retention Force of Resilient Liners and Conventional Liners

International Journal of Oral-Medical Sciences ◽

10.5466/ijoms.19.269 ◽

2021 ◽

Vol 19 (4) ◽

pp. 269-277

Author(s):

Shunsuke Nagata ◽

Hiroyuki Saeki ◽

Aya Kitamura ◽

Asako Suzuki ◽

Masayuki Kamada ◽

...

Keyword(s):

Surface Properties ◽

In Vitro Evaluation ◽

Retention Force ◽

The Relationship

Download Full-text

In vitro Retention Loss of Attachment-retained Removable Partial Denture

The Journal of Contemporary Dental Practice ◽

10.5005/jp-journals-10024-1449 ◽

2013 ◽

Vol 14 (6) ◽

pp. 1049-1053

Author(s):

Gülsen Can ◽

Baransel Özmumcu ◽

Pinar Altinci

Keyword(s):

Test Machine ◽

Clinical Use ◽

Removable Partial Denture ◽

Partial Denture ◽

Retention Force ◽

Retention Loss ◽

Custom Made ◽

Slide Type ◽

Over Time

ABSTRACT Aim To investigate the importance of attachment types on the retention loss of extracoronal attachment-retained removable partial dentures depending on the usage period. Materials and methods In order to observe the retention loss of 5 different attachments (OT Strategy, OT Strategy-metal protected, Vario-stud-snap and Vario-soft 3 and ERA-RV) over time, attachment-retained partial dentures representing Kennedy II mod. I case were placed in a custom-made, retention test machine. For each minute, eight separating and joining movements were performed and retention values (Newton) of the attachments were recorded by computer. The retention tests implemented in 540,1080 and 2160 cycles. The data were evaluated statistically according to the two-way ANOVA and Tukey parametrical tests. Results The slide type attachment providing the best retention force was observed to be the most worn out by this process (p < 0.01) while the ball type attachments, which typically have the lesser retention force, showed less retention loss (p < 0.01). Conclusion It can be concluded that the retention attributes of the attachment-retained dentures were affected by the specific type of precision attachment as well as the usage period. Clinical significance Precision attachments with ball-type plastic matrices may be recommended for the clinical use due to their retention stability over time. How to cite this article Can G, Özmumcu B, Altinci P. In vitro Retention Loss of Attachment-retained Removable Partial Denture. J Contemp Dent Pract 2013;14(6):1049-1053.

Download Full-text

Investigation of the retention forces of secondary telescopic crowns made from Pekkton® ivory in combination with primary crowns made from four different dental alloys: an in vitro study

Biomedical Engineering / Biomedizinische Technik ◽

10.1515/bmt-2018-0167 ◽

2019 ◽

Vol 64 (5) ◽

pp. 555-562 ◽

Cited By ~ 1

Author(s):

Marie Kotthaus ◽

Istabrak Hasan ◽

Ludger Keilig ◽

Manfred Grüner ◽

Christoph Bourauel ◽

...

Keyword(s):

Precious Metal ◽

In Vitro Study ◽

Dental Alloys ◽

Retention Force ◽

Group 4 ◽

Force Transducers ◽

Group 3 ◽

Group 2 ◽

Group 1

Abstract The aim of this study was to investigate the retention forces of secondary telescopic crowns made of polyetherketoneketone (PEKK) in combination with primary crowns made of four different dental alloys and to determine whether the retention forces change in the course of up to 5000 simulated wear cycles. A total of four groups of telescopic crowns were investigated: group 1: 10 primary crowns made of a gold alloy (NEOCAST®3), group 2: 10 primary crowns made of a non-precious metal alloy (Girobond NB), group 3: 10 primary crowns made of zirconium (Cercon®base) and group 4: 10 primary crowns made from PEKK (Pekkton®ivory). The corresponding secondary crowns were made from PEKK in all the four groups. Each pair was fixed axially in a wear simulator specifically designed for the study. Overall, 10,000 joining and separating cycles were performed for each group. To simulate intraoral conditions, a saliva substitute served as a lubricant. Force transducers were used to record the retention forces and after completing 10,000 cycles, the surface of each primary crown was examined using a scanning electron microscope (SEM). All groups showed an increase in the retention force for the first 2000 cycles which stayed constant for the remaining 8000 cycles. The Pekkton®ivory/Pekkton®ivory and NEOCAST®3/Pekkton®ivory combinations displayed mean retention force values of 16 N after a slight increase in the retention force. The Cercon®base/Pekkton®ivory and Girobond NB/Pekkton®ivory combinations displayed an initially high increase in the retention force and then showed a mean retention force of up to 29 N. All primary crowns displayed surface wear. Zirconium primary crowns showed the least wear compared to PEKK and the gold and non-precious metal alloys.

Download Full-text

In vitro retention force changes during cyclic dislodging of three novel attachment systems for implant overdentures with different implant angulations

Clinical Oral Implants Research ◽

10.1111/clr.13567 ◽

2020 ◽

Vol 31 (4) ◽

pp. 315-327

Author(s):

Sabrina Maniewicz ◽

Isabelle Badoud ◽

François R. Herrmann ◽

Najla Chebib ◽

Patrick Ammann ◽

...

Keyword(s):

Retention Force

Download Full-text

In Vitro Effect of Gallium-Doped Bioactive Glass on Enamel Anti-Demineralization and Bond Strength of Orthodontic Resins

Applied Sciences ◽

10.3390/app9224918 ◽

2019 ◽

Vol 9 (22) ◽

pp. 4918 ◽

Cited By ~ 2

Author(s):

Hyo-Kyung Song ◽

Kyung-Hyeon Yoo ◽

Seog-Young Yoon ◽

Hee Sam Na ◽

Jin Chung ◽

...

Keyword(s):

Antibacterial Activity ◽

Cell Viability ◽

Bioactive Glass ◽

Orthodontic Appliances ◽

Ion Release ◽

X Ray ◽

Retention Force ◽

Orthodontic Adhesives ◽

Vitro Effect

White spot lesions (WSL) that occur on teeth after orthodontic appliances have been attached are caused by bacterial demineralization of the enamel surface. This study investigated the anti-demineralization effect of orthodontic resins containing mesoporous bioactive glass nanoparticles (MBN) doped with gallium, which has antibacterial activity, as well as MBN with increased calcium and phosphate contents as these ions can remineralize enamel. Resins (CF, CharmFill Flow, Dentkist, Seoul, South Korea) containing 1%, 3%, and 5% Ga-doped MBN (GaMBN) were characterized using scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and isothermal tests, and their physical properties were measured in terms of Vickers microhardness, bracket retention force, and adhesive remnant index (ARI). Cell viability in the resins was confirmed by testing human dental pulp stem cells (hDPSCs), and ion release tests were performed after 1, 7, and 14 days to determine whether the resins released Ga3+, Ca2+, and PO43–. After 14 days, antibacterial activity was determined using Streptococcus mutans (S. mutans)—the bacteria that causes tooth decay—and the chemical remineralization effect was investigated using a cycle of acid–base solutions. The microhardness of the resins increased with GaMBN concentration whereas their bracket retention force, ARI, and cell viability remained unchanged. The bacterial activity of the 5%-GaMBN resin decreased after 24 and 48 h; however, the change in activity was not statistically significant. Anti-demineralization testing demonstrated that the degree of enamel demineralization decreased as the GaMBN concentration increased, which indicates that resins containing 5%-GaMBN may be viable orthodontic adhesives for preventing WSLs.

Download Full-text