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Alternative Therapies in Health and... May 2024To investigate the impact of the restoration of non-bracket invisible orthodontic titanium alloy implant on individuals with dental malocclusion and arch deficiency...
The Impact of the Restoration of Invisible Orthodontic Titanium Alloy Implant Without Bracket on Individuals Afflicted with Dental Malocclusion and Arch Deficiency Accompanied by Periodontitis and a Local Periodontal Inflammation.
OBJECTIVE
To investigate the impact of the restoration of non-bracket invisible orthodontic titanium alloy implant on individuals with dental malocclusion and arch deficiency accompanied by periodontitis and local periodontal Inflammation.
METHOD
A cohort of 120 patients presenting with dental malocclusion and defects compounded by periodontitis, were treated at our institution between January 2021 and January 2022; these patients were enrolled in a randomized controlled trial.. These patients were allocated into two groups. The control group (comprising 60 cases) underwent titanium alloy implant restoration, while the research group (also with 60 cases) received titanium alloy implant restoration following invisible orthodontic treatment without brackets. A one-year post-treatment follow-up was conducted, during which various parameters, including pain levels, aesthetic improvement, inflammatory response, dental function, oral hygiene, and the incidence of adverse events, were evaluated and compared before and after treatment between the two groups.
RESULTS
After six months of treatment, the visual analog scale (VAS) in the study group was lower than that in the control group (P < .05). After 6 months of treatment, the research team observed the changes in gingival crevicular interleukin-6 (IL-6), tumor necrosis factor-α (TNF-α), Interleuckin-1 (IL-1), plaque index (PLI), and soft dirt index (DI) were all lower than those in the control group (P < .05). After 6 months of treatment, the research group had higher scores for tooth functions such as chewing, swallowing, speech expression, and occlusion than the control group, as well as higher pink and white aesthetics indexes (P < .05). The difference in the incidence rate of adverse outcomes between the research and control group was not distinct (P > .05).
CONCLUSION
In case of dental malocclusion accompanied by periodontal disease, the utilization of titanium implants for rectifying dental arch deformities without the use of orthodontic brackets, devoid of orthodontic brackets, has demonstrated notable efficacy in alleviating patients' periodontal discomfort, their oral hygiene, and dental functionality. This modality is conducive to augmenting dental aesthetics without incurring heightened rates of unfavorable consequences, thereby enhancing treatment outcomes.
PubMed: 38702170
DOI: No ID Found -
Acta Odontologica Scandinavica May 2024Health complaints attributed to dental amalgam fillings comprise both intraoral and general health complaints. There are data suggesting that patients with medically...
OBJECTIVE
Health complaints attributed to dental amalgam fillings comprise both intraoral and general health complaints. There are data suggesting that patients with medically unexplained physical symptoms (MUPS) attributed to amalgam fillings show improvement in symptoms after removal of all amalgam fillings. However, data indicating changes of specific health complaints are limited. This study evaluated the changes of health complaints after removal of amalgam restorations in patients with health complaints attributed to dental amalgam fillings.
METHOD
Patients with MUPS attributed to dental amalgam (Amalgam cohort) had all their amalgam fillings removed. The participants indicated an intensity of 11 local and 12 general health complaints on numeric rating scales before the treatment and at follow-up after 1 and 5 years. The comparison groups comprising a group of healthy individuals and a group of patients with MUPS without symptom attribution to dental amalgam did not have their amalgam restorations removed.
RESULTS
In the Amalgam cohort, mean symptom intensity was lower for all 23 health complaints at follow-up at 1 year compared to baseline. Statistically significant changes were observed for specific health complaints with effect sizes between 0.36 and 0.68. At the 5-year follow-up, the intensity of symptoms remained consistently lower compared to before the amalgam removal. In the comparison groups, no significant changes of intensity of symptoms of health complaints were observed.
CONCLUSION
After removal of all amalgam restorations, both local and general health complaints were reduced. Since blinding of the treatment was not possible, specific and non-specific treatment effects cannot be separated.
Topics: Humans; Dental Amalgam; Norway; Female; Male; Prospective Studies; Middle Aged; Adult; Dental Restoration, Permanent; Cohort Studies
PubMed: 38699922
DOI: 10.2340/aos.v83.40260 -
Dental and Medical Problems 2024Nickel-titanium (NiTi) file separation during endodontic treatment is an undesirable event. This phenomenon needs to be understood by knowing the factors influencing... (Review)
Review
Nickel-titanium (NiTi) file separation during endodontic treatment is an undesirable event. This phenomenon needs to be understood by knowing the factors influencing fracture in endodontic files. There is a large amount of literature where these factors and their influence have been studied, increasing the knowledge about the mechanisms involved, mainly related to wire technology, file shapes and geometry, operator manipulation, the anatomy of the root canal, and the irrigation and sterilization processes. As many factors are involved, the complexity of the fracture phenomena increases and the isolated correlation of one factor with the file fracture becomes a small part of comprehending the separation phenomena. This thematic review aims to compile important reports from 2014 to 2022 on the factors influencing NiTi file separation. The information obtained was classified into wire technology, file geometry, operational aspects, irrigation and sterilization, and anatomy. For this purpose, the Scopus, Web of Science and ScienceDirect databases were consulted using a search string. Filters were applied to consolidate the final set of relevant papers covering the subject of factors influencing endodontic file separation. It was found that the fracture of NiTi files incorporates different mechanisms that operate simultaneously during the endodontic procedure and strongly affect the instrument performance. The collected information promotes good practices to prevent file separation.
Topics: Nickel; Titanium; Humans; Root Canal Preparation; Equipment Failure; Equipment Design; Sterilization; Dental Instruments
PubMed: 38686969
DOI: 10.17219/dmp/156805 -
Medicine Apr 2024This paper demonstrates a digital manufacturing technique of a removable orthodontic appliance from an intraoral scan. An intraoral scan was made for the maxillary and...
This paper demonstrates a digital manufacturing technique of a removable orthodontic appliance from an intraoral scan. An intraoral scan was made for the maxillary and mandibular arches. 3Shape Orthodontics Appliance Designer produced the virtual Hawley retainer, consisting of alloy components (Adam Clasps and Fitted Labial bow) and a base plate. The base plate design was modified to adapt to inserting the alloy components, which were combined using cold-cured acrylic. The finished Hawley retainer was assessed intraorally. The described technique emphasizes the design specifications of digitally designed and manufactured removable orthodontic appliances. A combination of additive and subtractive techniques was successfully employed to manufacture the alloy components and base plate. This novel method provides an alternative approach to manufacturing removable appliances with computer-aided design (CAD)/computer-aided manufacturing (CAM) technologies. The described process offers a precursor to digital manufacturing of other developed designs of dental appliances.
Topics: Humans; Printing, Three-Dimensional; Computer-Aided Design; Orthodontic Appliance Design; Polymers; Benzophenones; Polyethylene Terephthalates; Ketones; Alloys; Orthodontic Appliances, Removable
PubMed: 38669369
DOI: 10.1097/MD.0000000000038004 -
Dentistry Journal Apr 2024Orthodontic mini-implants are devices used for anchorage in various orthodontic treatments. We conducted a pilot study which aimed to observe preliminary trends...
UNLABELLED
Orthodontic mini-implants are devices used for anchorage in various orthodontic treatments. We conducted a pilot study which aimed to observe preliminary trends regarding the impact of heat treatment on the elastic modulus of Ti6Al4V alloy and stainless steel 316L mini-implants. The initial phase involved testing the impact of heat treatment on the mechanical properties of Ti6Al4V alloy and stainless steel 316L mini-implants.
MATERIAL AND METHODS
Ten self-drilling mini-implants sourced from two distinct manufacturers (Jeil Medical Corporation and Leone) with dimensions of 2.0 mm diameter and 10 mm length were tested. They were separated into two material groups: Ti6Al4V and 316L. Using the CETRUMT-2 microtribometer equipment, indentation testing was conducted employing a diamond-tipped Rockwell penetrator at a constant force of 4.5 N.
RESULTS
Slight differences were observed in the elastic modulus of the Ti6Al4V alloy (103.99 GPa) and stainless steel 316L (203.20 GPa) compared to natural bone. The higher elastic moduli of these materials indicate that they are stiffer, which could potentially lead to stress-shielding phenomena and bone resorption. Heat treatment resulted in significant changes in mechanical properties, including elastic modulus reductions of approximately 26.14% for Ti6Al4V and 24.82% for 316L, impacting their performance in orthodontic applications.
CONCLUSION
Understanding the effects of heat treatment on these alloys is crucial for optimizing their biomechanical compatibility and longevity in orthodontic treatment. To fully evaluate the effects of heat treatment on mini-implants and to refine their design and efficacy in clinical practice, further research is needed.
PubMed: 38668015
DOI: 10.3390/dj12040103 -
Journal of Functional Biomaterials Apr 2024Re-tightening the loosened dental implant abutment screw is an accepted procedure, however the evidence that such screw will hold sufficiently is weak. The purpose of...
Re-tightening the loosened dental implant abutment screw is an accepted procedure, however the evidence that such screw will hold sufficiently is weak. The purpose of this study was material analysis of lost dental implant abutment screws made of the TiAlV alloy from various manufacturers, which became lost due to unscrewing or damaged when checking if unscrewed; undamaged screws could be safely re-tightened. Among 13 failed screws retrieved from 10 cases, 10 screws were removed due to untightening and 3 were broken but without mechanical damage at the threads. Advanced corrosion was found on nine screws after 2 years of working time on all surfaces, also not mechanically loaded. Sediments observed especially in the thread area did not affect the corrosion process because of no pit densification around sediments. Pitting corrosion visible in all long-used screws raises the question of whether the screws should be replaced after a certain period during service, even if they are well-tightened. This requires further research on the influence of the degree of corrosion on the loss of the load-bearing ability of the screw.
PubMed: 38667553
DOI: 10.3390/jfb15040096 -
Journal of Functional Biomaterials Mar 2024This in vitro study aims to assess the cyclic fatigue resistance of the Protaper Ultimate (PTU) files compared to the Protaper Gold (PTG) and the M3 UDG (M3) files using...
This in vitro study aims to assess the cyclic fatigue resistance of the Protaper Ultimate (PTU) files compared to the Protaper Gold (PTG) and the M3 UDG (M3) files using various motion kinematics in simulated canals. As far as the authors are aware, no study has previously compared the three file systems before this current investigation. Therefore, closing this information gap is the goal of the current research. Methods: A total of (60 new endodontic files were randomly divided into 6 groups (10 files per group); groups 1, 3, and 5 used continuous rotation (CR), while groups 2, 4, and 6 used forward reciprocating motion (FRM). A manufactured stainless-steel artificial canal was used to perform the cyclic fatigue testing. The results were analyzed using Student's -test and two-way ANOVA. All pairwise comparisons revealed statistically significant differences in the time to failure (TTF) for every study group ( < 0.001), with the exception of the PTG and M3 files, which performed similarly using both CR and FRM. Conclusions: The PTU files performed better than the PTG and M3 files in terms of the TTF and number of cycles to failure (NCF) using both CR and FRM.
PubMed: 38667542
DOI: 10.3390/jfb15040085 -
Clinical, Cosmetic and Investigational... 2024The aim of this work is to conduct a literature review to highlight all the parameters involved in sub-prosthetic radicular fractures of teeth supported by metallic... (Review)
Review
PURPOSE
The aim of this work is to conduct a literature review to highlight all the parameters involved in sub-prosthetic radicular fractures of teeth supported by metallic dental core.
MATERIALS AND METHODS
The following research was performed among published studies over the last 10 years in two PubMed/Medline and Scopus and supplemented by manual searching within the bibliographies. The search was restricted to publications in English and French.
RESULTS
Out of the 1464 articles initially identified, 18 studies met our inclusion criteria and were subsequently included in the literature review. These consisted of eight Finite Element Analysis Studies, two Retrospective Studies and one Randomized Controlled Trial. The results of this review show that radicular fractures are influenced by several variables, including predisposition, with maxillary premolars and mandibular molars being the most commonly affected teeth. Intracanal preparation can induce crack formation, leading to localized high stress concentrations. Increased ferrule height to 2 mm significantly enhances dental fracture resistance. Using high modulus of elasticity alloys results in nearly complete stress transmission to dentin due to their limited deformability and absorption capacity. The highest fracture resistance is achieved when posts are sealed using resin-modified glass-ionomer cement. Longer posts may be preferable to prevent vertical fractures. Additionally, occlusal factors, through repetitive stresses, contribute to crack propagation from surface defects, a phenomenon termed fatigue fracture.
CONCLUSION
These findings have significant implications. Practitioners should be aware of the predisposition of certain teeth, the importance of preserving the ferrule effect, the choice of root post materials, post Cement Material and the role of occlusal forces in managing and preventing vertical root fractures.
PubMed: 38665472
DOI: 10.2147/CCIDE.S458697 -
Journal of Indian Prosthodontic Society Apr 2024The objectives of the study were to compare the adaptation of presintered zirconia and cobalt- chromium prostheses using microcomputed tomography (μCT), scanning... (Comparative Study)
Comparative Study
AIMS
The objectives of the study were to compare the adaptation of presintered zirconia and cobalt- chromium prostheses using microcomputed tomography (μCT), scanning electron microscopy (SEM), and stereomicroscope (SM).
MATERIALS AND METHODS
Twenty-four fixed dental prostheses (FDPs) were fabricated on metal abutments, duplicated from maxillary first premolar and first molar prepared on a typodont model. Teeth were reduced to obtain chamfer of 1.2 mm and reduction occlusaly of 2 mm occlusal. Scanning of the abutments was done with random assignment to two groups receiving the FDPs made from soft-milled Co-Cr (n = 12) and zirconia (n = 12). Marginal and internal gaps were assessed using three evaluation techniques (X-ray microcomputer tomography, SEM, and stereomicroscopy).
STATISTICAL ANALYSIS USED
Comparison of the results was made using Levene and analysis of variance tests (α =0.05).
RESULTS
Irrespective of the material tested, statistical differences were found between the measuring techniques (P = 0.001 overall); the obtained mean gaps were for CT scan (92.60 ± 13.31), for SEM (101.92 ± 23.03), and for SM (113.44 ± 14.68): the multiple comparisons between techniques found a significant difference between CT and SM (P < 0.001), and SEM and SM (P = 0.025). When materials were compared within each measuring technique, Co-Cr showed lower values compared to zirconia in SEM (P < 0.001) and Stereo (P = 0.049); similar results were found in CT.
CONCLUSIONS
Results values differed with the chosen measuring technique. Co-Cr prostheses had a better fit than zirconia prostheses in SEM and Stereo. µCT showed comparable results to SEM, smaller than SM results.
Topics: Zirconium; X-Ray Microtomography; Chromium Alloys; Microscopy, Electron, Scanning; Humans; Dental Prosthesis Design
PubMed: 38650346
DOI: 10.4103/jips.jips_429_23 -
Journal of Indian Prosthodontic Society Apr 2024(1) The aim of this study was to evaluate the effect of a ceramic bonder at the metal ceramic interface in sintered and casted cobalt–chromium (Co–Cr) alloy. (2) To...
AIM:
(1) The aim of this study was to evaluate the effect of a ceramic bonder at the metal ceramic interface in sintered and casted cobalt–chromium (Co–Cr) alloy. (2) To compare the shear bond strength between the different manufacturing techniques: Casting and direct metal laser sintering (DMLS).
SETTING AND DESIGN:
comparative study.
MATERIALS AND METHODS:
For the casting group, 40 clear acrylic patterns with dimensions of 20 mm × 10 mm × 2.5 mm were designed in a software and casted with Co–Cr alloy. For DMLS samples, a standard tessellation language file with the abovementioned dimensions was created through a software to fabricate 40 samples. All the samples were equally distributed into the following four groups: Group A – Casted samples with the application of Cerambond ( = 20). Group B – Casted samples without application of Cerambond ( = 20). Group C – DMLS samples with application of Cerambond ( = 20). Group D – DMLS without application of Cerambond ( = 20). Ceramic buildup was done on all 80 samples, followed by firing up to a temperature of 920°C in a ceramic furnace. SBS was evaluated using a universal testing machine and failure modes were examined under the electron microscope.
STATISTICAL ANALYSIS USED:
ANOVA test and Tukey’s honestly significance difference post hoc test for multiple comparisons.
RESULTS:
One-way analysis of variance test revealed that the shear load and bond strength values of all four groups were statistically different with < 0.001. Tukey’s test showed statistically significant difference among the four groups. The mean shear strength of Group C was significantly greater when compared to other groups, respectively.
CONCLUSIONS:
Within the limitations of this study, the application of Cerambond to both casted and sintered samples showed significantly increased SBS values and it was also observed that sintered samples had higher strength than casted samples. Altogether, the results indicate that the use of Cerambond increased the shear strength between cobalt Cr alloy and ceramics, thereby prolonging the longevity of the restorations.
Topics: Chromium Alloys; Shear Strength; Dental Bonding; Lasers; Humans; Metal Ceramic Alloys; Materials Testing; Ceramics; Dental Stress Analysis
PubMed: 38650341
DOI: 10.4103/jips.jips_476_23