1
|
Alansari RA, Zawawi KH, Vaiid N, Natto Z, Adel SM, Alshihri MR, Alsadat M, Dause R, Agou S, Hassan AH. Is motor-driven insertion of orthodontic miniscrews more advantageous than manual insertion? A micro-CT evaluation of bone miniscrew contact surface area and cortical microcracks in rabbits. Orthod Craniofac Res 2024. [PMID: 38881173 DOI: 10.1111/ocr.12824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/05/2024] [Indexed: 06/18/2024]
Abstract
AIM This in vitro study aimed to evaluate and compare the bone-miniscrew contact surface area (BMC) and the cortical bone microcracks (CM) resulting from manual (hand-driven) and automated (motor-driven) orthodontic miniscrew (OM) insertion methods. METHODS Thirty-three OM were inserted in the femurs of nine New Zealand rabbits using manual (n = 16) and automated (n = 17) insertions. After euthanizing the rabbits, bone blocks, each including one OM, were sawed. Micro-CT scanning was performed, and data analysis included reconstruction, binarization and quantification of morphometric parameters of BMC and the number and length of CM. Means and standard deviations for complete BMC, complete BMC proportion, cortical BMC, cortical BMC proportion, and length and number of CM were calculated. Mixed model analysis was used to adjust for more than one sample/CM per animal. A paired t-test was used to compare the number of CM between the two groups. RESULTS Compared to the automated insertion, manually inserted miniscrews had significantly lower complete BMC (7.54 ± 1.80 mm2 vs. 11.99 ± 3.64 mm2), cortical BMC (5.91 ± 1.48 mm2 vs. 8.48 ± 1.90 mm2) and cortical BMC proportion (79.44 ± 5.84% vs. 87.94 ± 3.66%). However, it was not statistically significant in complete BMC proportion (p = .052). The automated insertion also resulted in a significantly lower mean number of CM than the manual method (p = .012). However, the length of the cracks was shorter in the manual group but with no significant difference (p = 0.256). CONCLUSION Motor-driven OM insertion results in superior BMC and reduction in the number of CM, which may lead to better miniscrew stability.
Collapse
Affiliation(s)
- Reem A Alansari
- Department of Orthodontics, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Khaled H Zawawi
- Department of Orthodontics, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Nikhillesh Vaiid
- Faculty of Dentistry, National University of Singapore, Singapore, Singapore
- Department of Orthodontics, Saveetha Dental College, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, India
| | - Zuhair Natto
- Department of Dental Public Health, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Samar M Adel
- Department of Orthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
| | - Maha R Alshihri
- Department of Pedodontics, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Mohammed Alsadat
- University Dental Hospital, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Rania Dause
- Department of Orthodontics, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Shoroog Agou
- Department of Orthodontics, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Ali H Hassan
- Faculty of Dentistry, National University of Singapore, Singapore, Singapore
| |
Collapse
|
2
|
Duske K, Turan B, Prinz C, Lenz JH, Stahl F, Warkentin M. Functionality testing of an innovative biomechanically optimized and surface-modified orthodontic mini-screw-a comparative study. J Orofac Orthop 2024:10.1007/s00056-023-00508-9. [PMID: 38224419 DOI: 10.1007/s00056-023-00508-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Accepted: 10/09/2023] [Indexed: 01/16/2024]
Abstract
PURPOSE The failure rate of orthodontic mini-screws depends strongly on primary stability and, thus, on insertion torque. Further improvement regarding the failure rate might be achieved by modifying the surface coating. Therefore, the aim of the study was to investigate the stability of a newly designed and surface-modified orthodontic mini-screw in beagle dogs. METHODS Newly designed mini-screws coated either with DOTIZE® or DOTIZE®-copper (DOT GmbH, Rostock, Germany; each: n = 24) were inserted in the mandibles of eight beagle dogs for a duration of 8 months. Insertion and removal torque were measured. These data were compared to values generated by using the artificial bone material Sawbones® (Sawbones Europe AB, Malmö, Sweden). Experiments with and without torque limitation (each: n = 5) were run. The bone-to-implant contact rate and the amount of bone between the threads were examined. Statistical significance was set at P < 0.05. RESULTS The success rates of the in vivo study reached high levels with 95.3% for the DOTIZE-coated and 90.5% for the DOTIZE-copper-coated screws, whereas the insertion and removal torque did not differ between the coatings. During insertion, a torque limitation of 20 Ncm was necessary to ensure that the recommended limit was not exceeded. The insertion in Sawbones without torque limitation revealed a significantly higher torque compared to torque-limited insertion (18.2 ± 1.3 Ncm, 23.6 ± 1.3 Ncm). Bending occurred (n = 5) in the thread-free part of the mini-screw. CONCLUSIONS Surface coating might be able to improve the performance of orthodontic mini-screws. The study showed high success rates and stable mini-screws until the end of observation. Further investigations are necessary.
Collapse
Affiliation(s)
- Kathrin Duske
- Department of Orthodontics, University Dental School, Rostock University Medical Center, Strempelstr. 13, 18057, Rostock, Germany.
| | - Billan Turan
- Department of Orthodontics, University Dental School, Rostock University Medical Center, Strempelstr. 13, 18057, Rostock, Germany
| | | | - Jan Hendrik Lenz
- Department of Oral and Maxillofacial Surgery, Rostock University Medical Center, Rostock, Germany
| | - Franka Stahl
- Department of Orthodontics, University Dental School, Rostock University Medical Center, Strempelstr. 13, 18057, Rostock, Germany
| | - Mareike Warkentin
- Working Group for Implant Materials, Faculty of Mechanical Engineering and Marine Technologies, University of Rostock, Rostock, Germany
| |
Collapse
|
3
|
Inchingolo AM, Malcangi G, Costa S, Fatone MC, Avantario P, Campanelli M, Piras F, Patano A, Ferrara I, Di Pede C, Netti A, de Ruvo E, Palmieri G, Settanni V, Carpentiere V, Tartaglia GM, Bordea IR, Lorusso F, Sauro S, Di Venere D, Inchingolo F, Inchingolo AD, Dipalma G. Tooth Complications after Orthodontic Miniscrews Insertion. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:1562. [PMID: 36674316 PMCID: PMC9867269 DOI: 10.3390/ijerph20021562] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Revised: 01/05/2023] [Accepted: 01/11/2023] [Indexed: 05/13/2023]
Abstract
Orthodontic miniscrews (OM) are widely used in modern orthodontic clinical practice to improve skeletal anchorage and have a high safety profile. A complication at the time of OM insertion is tooth root perforation or periodontal ligament trauma. Rarely, OM injury can cause permanent damage, such as ankylosis, osteosclerosis, and loss of tooth vitality. The aim of this work was to analyze potential risks and dental complications associated with the use of OMs. A search of the PubMed, Cochrane, Web of Science, and Scopus databases was conducted without a time limit using the keywords "orthodontic mini-screw" and "dental damage", resulting in 99 studies. After screening and eligibility, including articles obtained through a citation search, 13 articles were selected. Four studies revealed accidental injuries caused by OM. Most of the damage was localized at the root level and resolved spontaneously with restorative cement formation after prompt removal of the OM, while the pain disappeared. In some cases, irreversible nerve damage, extensive lesions to the dentin-pulp complex, and refractory periapical periodontitis occurred, requiring endodontic and/or surgical treatment. The choice of insertion site was the most important element to be evaluated during the application of OMs.
Collapse
Affiliation(s)
| | - Giuseppina Malcangi
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70124 Bari, Italy
| | - Stefania Costa
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70124 Bari, Italy
| | | | - Pasquale Avantario
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70124 Bari, Italy
| | - Merigrazia Campanelli
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70124 Bari, Italy
| | - Fabio Piras
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70124 Bari, Italy
| | - Assunta Patano
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70124 Bari, Italy
| | - Irene Ferrara
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70124 Bari, Italy
| | - Chiara Di Pede
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70124 Bari, Italy
| | - Anna Netti
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70124 Bari, Italy
| | - Elisabetta de Ruvo
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70124 Bari, Italy
| | - Giulia Palmieri
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70124 Bari, Italy
| | - Vito Settanni
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70124 Bari, Italy
| | - Vincenzo Carpentiere
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70124 Bari, Italy
| | - Gianluca Martino Tartaglia
- UOC Maxillo-Facial Surgery and Dentistry, Department of Biomedical, Surgical and Dental Sciences, School of Dentistry, Fondazione IRCCS Ca’ Granda, Ospedale Maggiore Policlinico, University of Milan, 20100 Milan, Italy
| | - Ioana Roxana Bordea
- Department of Oral Rehabilitation, Faculty of Dentistry, Iuliu Hațieganu University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania
| | - Felice Lorusso
- Department of Innovative Technologies in Medicine and Dentistry, University of Chieti-Pescara, 66100 Chieti, Italy
| | - Salvatore Sauro
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70124 Bari, Italy
- Dental Biomaterials and Minimally Invasive Dentistry, Department of Dentistry, University CEU Cardenal Herrera, CEU Universities, C/Santiago Ramón y Cajal, s/n., Alfara del Patriarca, 46115 Valencia, Spain
| | - Daniela Di Venere
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70124 Bari, Italy
| | - Francesco Inchingolo
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70124 Bari, Italy
| | | | - Gianna Dipalma
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70124 Bari, Italy
| |
Collapse
|
4
|
Budsabong C, Trachoo V, Pittayapat P, Chantarawaratit PO. The association between thread pitch and cortical bone thickness influences the primary stability of orthodontic miniscrew implants: a study in human cadaver palates. J World Fed Orthod 2022; 11:68-73. [PMID: 35000882 DOI: 10.1016/j.ejwf.2021.12.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Revised: 11/27/2021] [Accepted: 12/14/2021] [Indexed: 11/18/2022]
Abstract
OBJECTIVE The purpose of this study was to mathematically evaluate the influence of variations in thread pitch and cortical bone thickness on the maximum insertion torque (MIT) and implant stability (IS) of miniscrew implants (MIs). METHODS Sixty custom made MIs with a 0.4-, 0.6-, 0.8-, 1.0-, or 1.2-mm thread pitch,12 for each pitch, were randomly placed into the palates of 10 embalmed human maxillae. The MIT was measured with a hand-operated digital torque reader screwdriver with a holding guide, and the IS test was performed using Anycheck. Conebeam computerized tomography was used to measure the cortical bone thickness(CBT) at each MI site. One-way ANOVA, Tukey post hoc test, Pearson's correlation,and multiple linear regression models were performed using the SPSS program. RESULTS The MIT and IS tests demonstrated a pitch-dependent decrease. The pitch had a strong negative correlation with MIT and IS, while the CBT had a strong positive correlation with those outcomes. The association between pitch and CBT significantly influenced MI primary stability. Moreover, a strong correlation was found between MIT and IS. CONCLUSIONS The MI primary stability, MIT, and IS are strongly influenced by theassociation between MI thread pitch and CBT.
Collapse
Affiliation(s)
- Chalermporn Budsabong
- Post-graduate student in rescidency program, Department of Orthodontics, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Vorapat Trachoo
- Lecturer, Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Pisha Pittayapat
- Assistant Professor, Department of Radiology, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Pintu-On Chantarawaratit
- Assistant Professor, Department of Orthodontics, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand.
| |
Collapse
|
5
|
Nenen F, Garnica N, Rojas V, Oyonarte R. Comparison of the primary stability of orthodontic miniscrews after repeated insertion cycles. Angle Orthod 2021; 91:336-342. [PMID: 33378455 DOI: 10.2319/050120-375.1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Accepted: 10/01/2020] [Indexed: 12/26/2022] Open
Abstract
OBJECTIVES To compare the primary stability of miniscrews after repeated cycles of insertion through insertion torque (IT) measurements and resonance frequency analysis (RFA). MATERIALS AND METHODS Sixty titanium miniscrews were divided into two groups according to the insertion protocol: one with predrilled sites and the other self-drilled into porcine iliac crest bone specimens. Each group had three cycles of reinsertion. After each insertion, the IT and RFA were measured. The IT was measured by using a torque meter, and the RFA was measured using the Osstell ISQ device. A total of five miniscrews of each group were selected for sequential assessment of the morphology of their tip and threads using scanning electron microscopy after each insertion cycle. RESULTS No statistically significant differences were found in the IT values of miniscrews reinserted up to three times in the group with predrilled surgical sites. The IT value increased significantly with the number of reinsertions in the self-drilled group. The RFA value decreased as the number of insertions increased in both groups. CONCLUSIONS Under the conditions of this in vitro study, reinserting miniscrews deteriorates the integrity of their tip and thread. Reinsertion should be discouraged particularly when insertion sites are not predrilled.
Collapse
|
6
|
Evaluation of Cortical Bone Microdamage and Primary Stability of Orthodontic Miniscrew Using a Human Bone Analogue. MATERIALS 2021; 14:ma14081825. [PMID: 33917087 PMCID: PMC8067727 DOI: 10.3390/ma14081825] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 03/27/2021] [Accepted: 04/02/2021] [Indexed: 11/17/2022]
Abstract
Orthodontic miniscrews have gained popularity; however, they have some drawbacks, including screw loosening that results from bone resorption caused by excess microdamage created during screw insertion. Pilot hole preparation through the cortical bone is considered beneficial to avoid such microdamage, while an overly large pilot hole impairs primary stability. Hence, we used a human bone analogue to evaluate the microdamage and primary stability to estimate the optimal pilot hole size that would minimize the screw loosening risk. Ti6Al4V orthodontic miniscrews and 1.0-mm-thick synthetic cortical bone pieces were prepared. Various compressive loads were applied in indentation tests to test pieces' surfaces, and the microdamaged areas were confirmed as stress-whitening zones. Screw insertion tests were performed in which a miniscrew was inserted into the test pieces' pilot hole with a diameter of 0.7-1.2 mm in 0.1-mm intervals, and the stress-whitening area was measured. The insertion and removal torque were also measured to evaluate primary stability. The stress-whitening areas of the 1.0-1.2 mm pilot hole diameter groups were significantly smaller than those of the other groups (p < 0.05), whereas the 0.9 and 1.0 mm pilot hole diameter groups showed higher primary stability than other groups. In conclusion, the bone analogue could be utilized to evaluate microdamage in cortical bones and the primary stability of miniscrews.
Collapse
|
7
|
Popova NV, Arsenina OI, Lebedenko IY, Rusanov FS, Khvorostenko EA, Glukhova NV. [The experimental study of a Russian orthodontic mini-screw]. STOMATOLOGIIA 2021; 100:7-12. [PMID: 34180618 DOI: 10.17116/stomat20211000317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
BACKGROUND The aim of this research is the experimental study measuring stability of the orthodontic miniscrews «Turbo» designed in Russia in comparison with its foreign analogues, namely, «Vector Tas» (USA) and «BioRay» (Taiwan). MATERIAL AND METHODS Four self-drilling orthodontic miniscrews of each manufacturer, i.e. «Vector Tas», USA, (10-mm length, 2-mm diameter), «BioRay», Taiwan, (10-mm length, 2-mm diameter), «Turbo», Russia, (9-mm length, 2-mm diameter), a total of 12 items, were inserted into native pig mandible sample. Their stability was estimated by torques using a dynamometer (Zahoransky AG, Germany) and «Periotest» device («Periotest M», Germany). This experiment was conducted in native pig mandible sample immediately after the screws' placement and in 7 days after loading at an angle 70°. RESULTS After application of a load, the decreased torque values and increased Periotest values were registered in all orthodontic miniscrews. CONCLUSION Orthodontic miniscrews «Turbo» designed in Russia are slightly inferior to «VectorTas» miniscrews and superior to «BioRay» miniscrews in primary stability and stability after 7 days under loading.
Collapse
Affiliation(s)
- N V Popova
- Central Research Institute of Dentistry and Maxillofacial Surgery, Moscow, Russia
| | - O I Arsenina
- Central Research Institute of Dentistry and Maxillofacial Surgery, Moscow, Russia
- Peoples' Friendship University of Russia, Moscow, Russia
| | - I Yu Lebedenko
- Central Research Institute of Dentistry and Maxillofacial Surgery, Moscow, Russia
- Peoples' Friendship University of Russia, Moscow, Russia
| | - F S Rusanov
- Central Research Institute of Dentistry and Maxillofacial Surgery, Moscow, Russia
| | - E A Khvorostenko
- Central Research Institute of Dentistry and Maxillofacial Surgery, Moscow, Russia
| | - N V Glukhova
- Central Research Institute of Dentistry and Maxillofacial Surgery, Moscow, Russia
| |
Collapse
|
8
|
Marchi A, Camporesi M, Festa M, Salvatierra L, Izadi S, Farronato G. Drilling Capability of Orthodontic Miniscrews: In Vitro Study. Dent J (Basel) 2020; 8:138. [PMID: 33371233 PMCID: PMC7766744 DOI: 10.3390/dj8040138] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 12/14/2020] [Accepted: 12/15/2020] [Indexed: 11/17/2022] Open
Abstract
The aims of this study were to assess the values and mechanical properties of insertion torque (IT) of steel miniscrews inserted in artificial bone blocks (Sawbones, Pacific Research Laboratories, Vashon, WA, USA) with different bone densities and to detect any scratches on the surface of the miniscrews after insertion. Forty self-drilling miniscrews (Leone S.p.A. ø 1.75 mm, L 8 mm) have been inserted into bone blocks that mimic different stability conditions (density: 20 PCF-pounds per cubic foot, 40 PCF, and 30 + 50 PCF with 2 mm and 4 mm of cortical bone). Before insertion and after removal, all miniscrews were inspected with a stereomicroscope 5x and a SEM to detect potential microscopic cracks. Using an electronic surgical motor (W&H Dentalwerk Bürmoos GmbH, Werner Bader Str. 1, 5111 Bürmoos, Austria), the maximum insertion torque value was registered. Stereomicroscope and SEM examination did not indicate any morphological and surface structural changes to the miniscrews, irrespective of the bone density they were inserted into. The findings showed that IT increased significantly with increasing bone density. In each artificial bone block, morphostructural analysis demonstrated the adequate mechanical properties of the self-drilling miniscrews. IT measurements indicated torque values between 6 and 10 Ncm for blocks with a density of 30 + 50 PCF, whereas the suggested values are between 5 and 10 Ncm.
Collapse
Affiliation(s)
- Alessandra Marchi
- Department of Orthodontics, Fondazione IRCCS Cà Granda, University of Milan, 20122 Milan, Italy; (M.C.); (M.F.); (L.S.); (S.I.); (G.F.)
| | | | | | | | | | | |
Collapse
|
9
|
Ahn HW, Kang YG, Jeong HJ, Park YG. Palatal temporary skeletal anchorage devices (TSADs): What to know and how to do? Orthod Craniofac Res 2020; 24 Suppl 1:66-74. [PMID: 33278057 DOI: 10.1111/ocr.12451] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 11/09/2020] [Accepted: 11/29/2020] [Indexed: 12/30/2022]
Abstract
OBJECTIVES Since palatal temporary skeletal anchorage devices (TSADs) have become important tools for orthodontic treatment, this narrative review was aimed to provide an updated and integrated guidelines for the clinical application of palatal TSADs. SETTING AND SAMPLE POPULATION A narrative review article including researches on palatal TSADs in orthodontics related to anatomy, success rate and clinical application. MATERIALS AND METHODS The anatomical characteristics, success rate and its consideration factors and clinical application of palatal TSADs based on the direction of tooth movement were evaluated. RESULTS To improve the stability of TSADs, hard tissue factors such as bone depth, cortical bone thickness, bone density and soft tissue thickness were evaluated. Anatomically risky structures, including the nasopalatine foramen, canal and the greater palatine foramen, nerve, vessel need to be identified before placement. The success rate of palatal TSADs was greater than that of the buccal inter-radicular space. Palatal TSADs have been used for various purposes because they can control tooth movement in all directions and, three-dimensionally; their applications include the retraction of anterior teeth, protraction of posterior teeth, distalization, intrusion, expansion and constriction. They can be applied directly or indirectly to the lingual arch or transpalatal arch. Design modifications using splinted 2 miniscrews have been suggested. CONCLUSION Palatal TSADs allow clinicians to perform minimally invasive and easy placement with good stability by understanding the anatomical characteristics of the palatal region, and they show good control over 3-dimensional tooth movements in various clinical cases.
Collapse
Affiliation(s)
- Hyo-Won Ahn
- Department of Orthodontics, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | - Yoon-Goo Kang
- Department of Orthodontics, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | - Hyun-Joo Jeong
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, South Korea
| | - Young-Guk Park
- Department of Orthodontics, School of Dentistry, Kyung Hee University, Seoul, South Korea
| |
Collapse
|
10
|
Migliorati M, Drago S, Amorfini L, Nucera R, Silvestrini-Biavati A. Maximum insertion torque loss after miniscrew placement in orthodontic patients: A randomized controlled trial. Orthod Craniofac Res 2020; 24:386-395. [PMID: 33274528 DOI: 10.1111/ocr.12449] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 11/18/2020] [Accepted: 11/23/2020] [Indexed: 11/28/2022]
Abstract
OBJECTIVES To compare torque recordings of immediately loaded orthodontic miniscrews between insertion time and different post-placement timepoints (2 weeks, 4 weeks and removal time, respectively). SETTING AND SAMPLE POPULATION Parallel trial with an allocation ratio of 1:1. Eligibility criteria were needs of fixed orthodontic treatment, no systemic disease and absence of using drugs altering bone metabolism. MATERIAL AND METHODS Patients received miniscrews, 2.0 mm diameter and 10 mm length. All miniscrews underwent inter-radicular placement, and they were placed in the maxilla or in the mandible, palatally or buccally. No pre-drilling was performed. Miniscrews were loaded immediately after the insertion and were used for distalization, intrusion, extrusion, mesialization or indirect anchorage. Patients were randomly divided into three groups. For each patient, Maximum Insertion Torque (MIT) was evaluated at baseline. MIT was measured again after 2 weeks and after 4 weeks by tightening the screw a quarter of turn in Groups 1 and 2, respectively. At the end of the treatment, maximal removal torque was evaluated in Group 3. Torque variation with respect to insertion time was considered as the primary outcome. Baseline and longitudinal differences were tested using the linear mixed-effects (LME) model. RESULTS Forty seven patients and 74 miniscrews were followed up. An association existed between maximum insertion torque and the observation time. A torque decrease of 26.9% and 30% after 2 weeks was observed for mandibular and maxillary miniscrews, respectively. After 1 month, torque values were similar to the baseline records. The overall success rate was 79.7%. No serious harm was observed. CONCLUSIONS Maximum insertion torque undergoes a loss during the first 2 weeks, and its values may depend on the insertion site and the anchorage purpose. Removal torque value is almost the same as the initial torque after 1 month.
Collapse
Affiliation(s)
- Marco Migliorati
- Orthodontics Department, School of Dentistry, University of Genova, Genova, Italy
| | - Sara Drago
- Orthodontics Department, School of Dentistry, University of Genova, Genova, Italy
| | | | - Riccardo Nucera
- Department of Biomedical and Dental Sciences and Morphofunctional Imaging, University of Messina, Messina, Italy
| | | |
Collapse
|
11
|
Effects of size and insertion angle of orthodontic mini-implants on skeletal anchorage. Am J Orthod Dentofacial Orthop 2019; 156:220-228. [PMID: 31375232 DOI: 10.1016/j.ajodo.2018.08.026] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Revised: 08/01/2018] [Accepted: 08/01/2018] [Indexed: 11/24/2022]
Abstract
INTRODUCTION The primary aim of this in vitro study was to compare the insertion torque (IT) and anchorage force (AF) values of 4 different sizes of orthodontic mini-implants with 2 different angles. The second aim was to evaluate the relationship between IT and AF values under different diameter, length, and insertion angle variables. METHODS A total of 160 mini-implants, including 20 implants in each group, with 4 different sizes (1.6 × 8 mm, 1.6 × 10 mm, 2.0 × 8 mm, and 2.0 × 10 mm) at 2 different angles (70° and 90°), were inserted into bovine iliac bone segments. The IT and AF values leading to 1.5 mm deflection were compared. The correlations between IT and AF values under different variables were also analyzed. RESULTS The mini-implants with greater diameter and length showed greater IT and AF values (P <0.05). The IT and AF values of mini-implants inserted at 70° angle were significantly greater than those of mini-implants inserted at 90° angle (P <0.001). Significant correlations were found between IT and AF values in all variables. CONCLUSIONS The diameter, length, and insertion angle of orthodontic mini-implants have significant effects on IT and AF values. Insertion angle and diameter of mini-implants are more effective than implant length on skeletal anchorage. Significant correlations are present between IT and AF values of mini-implants regardless of their diameters, lengths, and insertion angles.
Collapse
|
12
|
Insertion torque values and success rates for paramedian insertion of orthodontic mini-implants. J Orofac Orthop 2018; 79:109-115. [DOI: 10.1007/s00056-018-0120-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Accepted: 01/15/2018] [Indexed: 10/18/2022]
|