Magnetic Attachment Research Articles

Magnetically coupled tooth arrangement for an implant-supported fixed complete denture: A dental technique

Magnets have been used to help position dental components, including magnetic mounting plates for articulators and magnetic attachments for implant surgical guides. A magnetically coupled tooth arrangement technique used the fixed reference point of integrated implants to determine maxillomandibular relations and the tooth arrangement, thus improving the efficiency of the clinical appointment. The magnetic framework was screwed into the implants only once for the duration of a clinical appointment. The base was used to complete the tooth arrangement and determine the maxillomandibular jaw relationship.

Influence of implant number on the retention and support of mandibular overdentures

Background: There are two distinct categories of attachments—magnetic attachments and positioner attachments—currently in use for dental implants. Many implants required for implant-retained overdentures need support from implant-retained overdentures. Purpose: The aim of this study is to evaluate the effect of different implant numbers and attachment types on the retention and support of implant-retained overdentures. Methods: This experimental work involved the utilization of a model that replicated a mandibular edentulous arch, a total of five models. Within this model, seven dental implant analogues were implanted to mimic the tooth positioning observed in the natural dentition. Thirty-five titanium dental implant analogues (Dentium, South Korea) were employed in this study. A total of ten overdenture housings were fabricated using 3D printer acrylic resin, with each housing including a specific type of attachment (magnetic and positioner attachment). These attachments were equipped with three loops that were affixed to the occlusal surface of the housing. Subsequently, three chains were connected between the loops and a force gauge testing equipment. Results: The positioner was found to be more retentive and supportive than the magnetic one in the three directions of the dislodgement test as well as under unilateral and bilateral load, according to an independent t-test comparing magnetic and positioner attachment (p<0.05). Conclusion: Depending on the method of attachment that is used, variations in implant number have varying effects on the retention and support of an implant-held overdenture.

Magnetic Attachment For Tooth Supported Mandibular Overdenture: A Case Report

The goal of preventive prosthodontics is to highlight the significance of any surgery that can postpone or completely prevent future prosthodontic issues. In terms of preventive prosthodontics, the overdenture is a therapeutic option that is supported by science. Overdentures have been fitted with a variety of attachments to improve retention. Because rare earth magnets like Sm-Co and Nd-Fe-B may be produced in small sizes as retentive devices for complete dentures, detachable partial dentures, obturators, and maxillofacial prosthesis, their application for increasing retention has been widely used in the field of prosthodontics. This article presents a simple method of fabricating mandibular over denture retained by magnets in a patient whose mandibular residual ridge was severely resorbed with few remaining teeth and opposed by maxillary complete denture

Intraindividual Comparison of Image Artifacts of Two Generations of Rotatable Cochlear Implant Magnets.

In cochlear implant recipients, the diagnostic value of magnetic resonance imaging (MRI) scans is reduced by image artifacts. The static magnetic field of a 3.0T scanner is associated with the risk of implant demagnetization. The development of rotatable implant magnets aimed to support the advancement of 3.0T MRI scanners and eliminate the risk of demagnetization of cochlear implant magnets. This study aimed to compare the image artifacts caused by first-t and second-generation rotatable cochlear implant magnets in 3.0T MRI. Three Tesla MRI T2W TSE sequences were performed on 3 subjects with first- and second-generation rotatable cochlear implant magnets. The cochlear implant was fixed to the head at the implantation position by a swim cap. The size of the image artifact was determined in the transverse plane. Intraindividual comparative analyses showed that within the margin of combined uncertainty of 5 mm at a resolution of 2 mm, the cochlear implant-induced image artifacts in all subjects showed for both (first- and second-generation rotatable cochlear implant magnets), the same maximum image artifact dimension of 125 mm. We could show that no difference in image artifact size was detected within the margin of error determined by resolution, localized induced shift of the scan, and reproducibility of the tilt angle of the head relative to the chest in a living subject. Assumed improved magnet attachment can be reached without compromising of the magnet artifact size.

Magnum of magnet: Rehabilitation of surgical defect post rhinocerebral mucormycosis with hybrid prosthesis

Midfacial defects are defined as ones limited to the middle one-third of the face in the horizontal axis which communes with intraoral maxillary defects. They affect patient’s phonation, chewing capacity, quality of life, and social and community behavior. Surgical reconstruction alone is inadequate to rehabilitate these large midfacial defects, thereby necessitating use of a maxillofacial prosthesis to restore form, function, esthetics and comfort. The present case report presents the prosthetic restoration of a surgical defect secondary to treatment of rhinocerebral mucormycosis with an extraoral (exenteration) and intraoral (Armany Class IV) defect connected with magnetic attachment.

Oral Rehabilization of CSC Telescopic Denture with Magnetic Attachments in Treating Bilateral Molars Missing of Mandibular Arch

Oral Rehabilization of CSC Telescopic Denture with Magnetic Attachments in Treating Bilateral Molars Missing of Mandibular Arch

Influence of Coating Material Thickness on the Attraction Force of Dental Magnetic Attachment: An In Vitro Study.

This study aimed to determine the influence of coating material thickness on the attraction force of dental magnetic attachment (DMA). An in vitro experimental design was implemented using DMA as samples coated with different material types including polytetrafluoroethylene (PTFE) and glass ionomer varnish. DMA consists of keeper and assembly. The coating material was applied to DMA in two ways, on the assembly only and both the keeper and assembly. The thickness of each coated DMA was measured with a digital micrometer, and analysis was subsequently conducted with a universal testing machine to evaluate potential alterations in magnetic attraction force. Comparison was made between the attraction force of both the coated and uncoated DMA serving as a control specimen. The thickness of the coating material applied to both the keeper and assembly was 25 μm, while PTFE and varnish coating on the assembly alone was estimated as 12 and 10 μm, respectively. The magnetic attraction force of the uncoated DMA was 613.63 gf. Following coating, the magnetic attraction force decreased by 34.02-79.45 gf. The ANOVA test indicated that the decrease in magnetic attraction observed across both types of coating material and technique did not show significant differences. The thickness and type of coating material had no significant effect on magnetic attraction.

Assessment of Retention of Implant Bearing Mandibular Overdentures with Various Attachments: A Three-Year Follow-Up.

Mandibular dentures are considered dubious in terms of retention in resorbed ridges. Implant bearing overdentures can be a solution to the abovesaid issue. Various attachments in use offer variations in retention and maintenance. The aim was to assess long term durability and retention of implant supported overdenture attachments. Two implant bearing overdentures were placed in 20 patients. Magnet and ball attachment were used and dentures were evaluated over a period of three years at different time intervals. Difference of attachments' performance between intervals was assessed with ANOVA test and Tukey HSD post hoc test and the level of significance was set at p<0.05. There was a decline in retention throughout research period in both categories; the ball and socket batch showed statistically significant (P<0.05) better retention force compared to that of magnet group. There was lesser decline in mean retention force of 10.97N±0.82 to 7.24N±0.903 from one month to three years in magnet attachment retained overdentures. Ball attachments offer better retentive forces than magnet category. Magnet bearing overdentures offer more durability in terms of retention.

Finite Element Analysis of Stress Distributions for Mandibular Dental Implant-Supported Overdentures with Magnetic Attachments in Osteoporotic and Normal Bone.

To compare the biomechanical responses of a normal mandible to an osteoporotic mandible with two-implant-supported magnetic attachments. A 3D finite-element model of a two-implant-supported mandibular overdenture with magnetic attachments was developed, and normal and osteoporotic bone samples were prepared. Four types of load were applied to the overdenture in each model: 100 N vertical and oblique loads on the right first molar, and a 100 N vertical load on the right canine and incisors. Biomechanical behaviors of the peri-implant bone, implant, and mucosa were recorded. Maximum equivalent stresses and elastic strains were analyzed. Equivalent elastic strain in osteoporotic cortical and cancellous bone was 9% to 71% and was 142% and 207% greater than in normal cortical bone, respectively. Equivalent elastic strain in the first molar oblique loading condition was 101% to 190% greater than in the first molar vertical loading condition. Osteoporotic cancellous bone was weaker and less resistant to deformation than normal bone, and oblique loading was more harmful than vertical loading.

Quantum statistics transmutation via magnetic flux attachment

Quantum statistics transmutation via magnetic flux attachment

Single maxillary complete overdenture using novel magnetic attachment

Overdenture magnetic attachments are designed to treat patients experiencing complications from tooth loss due to aging, with issues like alveolar ridge resorption and reduced oral function. The novel Magteeth™ magnetic attachment system has undergone innovation compared to previous magnet attachment describing an improved efficiency in denture magnetic attraction. A 76-year-old female patient came to Department of Prosthodontic Clinic, Universitas Airlangga Dental Hospital to restore masticatory function and improve smile aesthetics. The clinical and radiographic evaluation revealed multiple missing teeth, specifically tooth numbers 18, 17, 15, 12, 11, 21, 22, 24, 26, 28, 37, 36, 35, 46, 47, and 48. Furthermore, there were chronic apical periodontitis, specifically gangrene radix, noted on teeth 16, 14, 13, 23, 27, 34, 38, and 44, and resorbed alveolar ridge on the missing tooth region. We use the Magteeth™ novel magnetic attachment in this case for the maxillary complete overdenture on tooth 25 to improve retention, and mandibular metal frame partial denture to ensure optimal function and patient satisfaction throughout the treatment process. Surface treatment on Magteeth™ root keeper and magnet is essential in denture and magnet integration. The novel Magteeth™ magnetic attachment is manage to overcome loss of retention problem during slight denture movements caused by chewing conventional attachments, which was the major disadvantage from the predecessor. Overall, the patient expresses satisfaction with the treatment in terms of both functionality and aesthetics.

Immediate Versus Conventional Loading of Two-Implant Overdenture with Magnetic Attachments: A 5-Year Follow-Up on Patient-Reported Outcomes

Comprehensive, long-term studies on patient-reported outcomes for two-implant overdentures with magnetic attachments using immediate or conventional loading methods are lacking. This study aimed to provide 5-year follow-up data comparing patient-reported outcomes for mandibular overdentures supported by two implants with magnetic attachments under immediate or conventional loading. Nineteen edentulous mandible patients were randomly assigned to immediate (IG) or conventional loading groups (CG). Two implants were placed with prostheses, loaded on the same day (immediate) or three months later (conventional). Participants completed questionnaires (oral health-related quality of life (OHRQoL), patient general satisfaction, and patient’s denture assessment (PDA)) at baseline and yearly intervals for 5 years. Results showed no significant differences between IG and CG throughout the study. However, the within-group analysis revealed significant improvements in OHRQoL, patient satisfaction, and all PDA domains from the baseline to years 1–5. Regarding patient satisfaction, significant differences were observed between T1, T2, and T3 when compared with T0 of IG and T1-T0 of CG. Regarding PDA results of T4-T5, IG exhibited several significant differences compared to CG. In conclusion, this study suggests that two-implant overdentures with magnetic attachments, whether immediately or conventionally loaded, improve patient-reported outcomes. Immediate loading may have prolonged effects on the improvement of patient-reported outcomes.

Single-drop electrochemical immunosensor with 3D-printed magnetic attachment for onsite smartphone detection of amoxicillin in raw milk

Amoxicillin is a beta-lactam group of antibiotics used against bacterial infections. The growth of the antibiotic market and abuse of amoxicillin led to its accumulation in nature, especially in foods. Thus, rapid amoxicillin tests are needed to protect human health and increase food safety. In this study, a single drop, mobile electrochemical amoxicillin immunosensor was developed for the first time. The immunosensor platform is based on amoxicillin antibodies conjugated magnetic nanoparticles. A 3-Dimensional (3D) cell capable of accumulating amoxicillin molecules, which interact with antibody-conjugated magnetic nanoparticles on the electrode surface was designed and 3D-printed. A small potentiostat connected to an Android mobile phone was used to detect amoxicillin in a single-drop raw milk sample in a 3D-printed cell. Results demonstrated linearity between 0.5 and 100 µM with an LOD of 0.44 µM. Due to its rapid and portable application, the designed immunosensor shows good potential in on-site amoxicillin detection from milk samples.

Magnetic attachment for complete overdenture: A case report

Background: Overdenture is a partial or complete denture that has support from natural tooth roots that have been treated with endodontic treatment. Retain the remaining teeth prevent resorption of alveolar ridge. An overdenture with a magnetic attachment can be used to increase the retention of the denture. The magnets transfer the occlusal load to the bone through the periodontal ligament of retained roots that are attached with remaining root structure Objectives: This case report is aimed to report the step-by-step treatment of complete denture mandibula and complete overdenture maxilla with magnetic attachment retained design Case Report: A 62-year-old female visited the Prosthodontic Clinic of Dentistry Faculty, Airlangga University with a chief complaint of difficulty in eating. Clinical examination shown partial edentulous in the mandibula. The remaining teeth were 18, 14, 23, 25 and 43. Case management: After thorough observation from the clinical presentation and radiographic, magnetic attachment was planned on 14 in order to retain the remaining tooth and improving retention and stabilization of the maxillary denture. Conclusion: Magnetic maxilla overdenture is able to provide support, stability and retention.

Effect of spatial arrangement and clinical service lifetime simulation on the retention of magnetic units used in implant-anchored orbital prostheses

Statement of problemEvidence for the optimal spatial arrangement of magnetic attachments in implant-supported orbital prostheses is lacking. PurposeThe purpose of this in vitro study was to assess the effect of 6 different spatial arrangements on the retentive force of magnetic attachments following the in vitro simulation of clinical service by insertion-removal test cycles and the contribution of artificial aging to the morphological alterations induced on the magnetic surfaces. Material and methodsNi-Cu-Ni plated disk-shaped neodymium (Nd) magnetic units (d=5 mm, h=1.6 mm) were secured on leveled (50×50×5 mm, n=3) and angled (40×45×40 mm, interior angle=90 degrees, n=3) pairs of test panels in 6 different spatial arrangements: triangular_leveled (TL), triangular_angled (TA), square_leveled (SL), square_angled (SA), circular_leveled (CL), and circular_angled (CA) generating corresponding test assemblies (N=6). TL and TA arrangements included 3 magnetic units (3-magnet groups) and SL, SA, CL, and CA 4 (4-magnet groups). The retentive force (N) was measured at a mean crosshead speed of 10 mm/min (n=10). Each test assembly was subjected to insertion-removal test cycles with a 9-mm amplitude, ν=0.1 Hz, and n=10 consequent retentive force measurements at a crosshead speed of 10 mm/min at 540, 1080, 1620, and 2160 test cycles. Surface roughness alterations following the 2160 test cycles were measured by calculating the Sa, Sz, Sq, Sdr, Sc, and Sv parameters with an optical interferometric profiler with 5 new magnetic units used as a control group. Data were analyzed with 1-way ANOVA and Tukey HSD post hoc tests (α=.05). ResultsThe 4-magnet groups had statistically significantly higher retentive force than the 3-magnet ones at baseline and following the 2160 test cycles (P<.05). In the 4-magnet group, the ranking at baseline was SA<CA<CL<SL (P<.05) and following the test cycles SA=CA<CL<SL (P<.05). No statistically significant differences were found in the surface roughness parameters (Sa, Sz, Sq, Sdr, Sc, and Sv) following the 2160 test cycles among the experimental groups tested (P>.05). ConclusionsFour magnetic attachments placed on an SL spatial arrangement resulted in the highest retention force but presented with the highest force reduction following the in vitro simulation of clinical service by insertion-removal test cycles.

Total and partial magnetic retained overdenture. A clinical report.

Abstract An overdenture is a denture supported partly by soft tissues and partly by retained teeth or implants. Magnetic tooth-retained overdentures are used to increase support, retention, and stability but also prevent alveolar ridge resorption. Magnetic attachments increase the retention of partial or complete dentures regardless of the path of the insertion and, in addition, can be used for abutment teeth with periodontal disease. This paper discusses two oral rehabilitation cases with total and partial tooth-retained overdenture.

Magnetic attachments and taping method for nipple-areolar prostheses retention: development of a method and case series

Magnetic attachments and taping method for nipple-areolar prostheses retention: development of a method and case series

Rehabilitation of Anterior Maxillectomy Patient with Dyna Magnets Retained Hollow Obturator: A Case Report

Prosthetic rehabilitation of midfacial defects has always been a challenging treatment plan in prosthodontics. These defects lead to functional and aesthetic deficiencies. These defects are less commonly rehabilitated by surgical construction alone. Typically, a prosthesis is required to restore both function and aesthetics. In the present study, the authors present the case of a 54-yearold male patient who had undergone partial maxillectomy for a verrucous lesion and complains of difficulty in mastication and speech. The objective of the treatment was to fabricate a 2-piece obturator with magnet attachments, facilitating easy insertion and removal. The final prosthesis demonstrated satisfactory retention, stability, and functional efficiency for the patient.

Silicone orbital prosthesis retained by a solitary dental implant placed in the inferior lateral orbital rim with a unique magnetic attachment framework

ABSTRACT Maxillofacial trauma is an excruciatingly painful condition for the patient both physically and psychologically. In clinical scenarios, wherein reconstructive surgeries fail to rehabilitate the patient, maxillofacial prosthesis comes to the rescue. Presented here is a clinical report of prosthetic rehabilitation of an orbital deformity for a patient who had an accident. A solitary intraoral dental implant was placed in the inferior lateral orbital rim. The patient was rehabilitated using a silicone orbital prosthesis retained by a unique metal framework housed with Dyna magnetic keepers and magnets embedded in a prosthesis. The framework was cemented on the implant abutment.

Oral function of implant-assisted removable partial dentures with magnetic attachments using short implants: A prospective study.

This prospective study aimed to compare the oral functions of removable partial dentures (RPDs) with those of implant-assisted removable partial dentures (IARPDs) with short implants and magnetic attachments in patients with mandibular Kennedy class I and II. Thirty participants with mandibular Kennedy class I or II and at least three distal missing teeth were recruited. Oral functions, including mixing ability, comminuting ability, maximum bite force, and occlusal contact area, were assessed for RPDs (stage 0), IARPDs with healing caps (stage 1), and IARPDs with magnetic attachments (stage 2). The implants were loaded with occlusal force in stages 1 and 2. Finally, the data of the 27 participants who completed the evaluation at stage 2 were analyzed. The Wilcoxon signed-rank test with Bonferroni correction was used to assess the differences in the oral functions among the different stages. The implant survival rate was 93.8%. There were significant differences in the comminuting ability and occlusal contact area between stages 0 and 2 (p< .001 and p= .036, respectively) and stages 1 and 2 (p= .003 and p= .015, respectively). Regarding the maximum bite force, there was a significant difference between stages 1 and 2 (p= .018). However, there was no significant difference in the mixing ability between the three stages. Within the limitations of this study, it was concluded that IARPDs in the mandible with short implants and magnetic attachments may improve oral functions.