Failure load and stress analysis of orthodontic miniscrews with different transmucosal collar diameter

Sfondrini, Maria Francesca; Gandini, Paola; Alcozer, Roberto; Vallittu, Pekka K.; Scribante, Andrea

doi:10.1016/j.jmbbm.2018.07.032

Cited by 60 publications

(48 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In summary, IGPD or other mini-screw-supported devices present good clinical reliability [ 17 ] and excellent mechanical properties even with small diameters [ 18 ]. The presented patient case shows that CB-CT-based planning and the preoperative appliance (customized distractor) improved the predictability of the surgical result, and it achieved a minimally invasive guided biopsy and a shortened duration of surgery.…”

Section: Discussionmentioning

confidence: 99%

Multifunctional Templates for Minimized Osteotomy, Implantation, and Palatal Distraction with a Mini-Screw-Assisted Expander in Schizodontism and Maxillary Deficit

Nilius¹,

Hess²,

Haim

et al. 2020

Case Reports in Dentistry

View full text Add to dashboard Cite

Purpose. Schizodontism is complete separation of a dental germ. It results in a twin tooth and supernumerary teeth. The treatment of transverse constriction in combination with supernumerary dental germs and impacted central incisors can pose a challenge, especially in young patients, when the number of permanent teeth is not adequate to ensure secure anchorage. The use of navigation templates based on three-dimensional X-ray images allows for precise insertion of temporary mini-implants for the acquisition of palatal distractors. In addition, templates allow for minimally invasive biopsies and osteotomies. Methods. The treatment of schizodontism, dentitio tarda, and transverse constriction is to be assessed as an interdisciplinary method by using mini-screw-assisted devices. Minimized osteotomy of impacted supernumerary teeth or dental implantation can be carried out in a one-step-procedure based on digital preplanning and prefabrication of orthodontic devices. Results. Multifunctional templates allow for early planning, preoperative fabrication, and intraoral fixation of orthodontic appliances. In the case of an adolescent patient, a sustainable, interdisciplinary treatment concept could be demonstrated that shows age-appropriate gnathological development and stable growth conditions over a follow-up period of 10 years. Conclusion. One can likely assume that multifunctional templates allow for minimally invasive one-step surgeries as an interdisciplinary tool between orofacial surgery and modern orthodontics.

show abstract

Section: Discussionmentioning

confidence: 99%

Multifunctional Templates for Minimized Osteotomy, Implantation, and Palatal Distraction with a Mini-Screw-Assisted Expander in Schizodontism and Maxillary Deficit

Nilius¹,

Hess²,

Haim

et al. 2020

Case Reports in Dentistry

View full text Add to dashboard Cite

show abstract

“…Augmentation of the alveolar crest is one of the basic ways to improve bone conditions in the oral cavity before its prosthetic treatment. The regeneration of bone tissue allows clinicians to place implants or miniscrews with greater diameter and length [8], thus allowing better clinical results and durability [9]. The basic biological mechanism used is osteoconduction.…”

Section: Introductionmentioning

confidence: 99%

Influence of General Mineral Condition on Collagen-Guided Alveolar Crest Augmentation

2020

View full text Add to dashboard Cite

The local regeneration of bone defects is regulated by general hormone, enzyme, ion, and vitamin levels. General diseases and dysregulation of the human mineral system can impact this process, even in alveolar crest. The aim of this study is to investigate a relation between bone density, measured in two-dimensional X-rays, and general mineral condition of patients. The study included 42 patients on whom tooth extractions were performed. Data were divided into two groups: the region where collagen scaffold (BRM) was used and the reference region of intact normal bone (REF). Two-dimensional intraoral radiographs were taken in all cases just after the surgery (00 M) and 12 months later (12 M). Thyrotropin (TSH), parathormone (PTH), Ca2+ in serum, HbA1c, vitamin 25(OH)D3, and spine densitometry were checked. Digital texture analysis in MaZda 4.6 software was done. Texture Index (TI: BRM 1.66 ± 0.34 in 00 M, 1.51 ± 0.41 in 12 M, and REF 1.72 ± 0.28) and Bone Index (BI: BRM 0.73 ± 0.17 in 00 M, 0.65 ± 0.22 41 in 12 M, and REF 0.80 ± 0.14) were calculated to evaluate bone regeneration process after 12 months of healing (TI (p < 0.05) and BI (p < 0.01) are lower in BRM 12 M than in REF). This showed a relation between BI and TSH (R2 = 26%, p < 0.05), as well as a between BI and patient age (R2 = 65%, p < 0.001), and a weak relation between TI and TSH level (R2 = 10%, p < 0.05). This study proved that a collagen scaffold can be successfully used in alveolar crest regeneration, especially in patients with a high normal level of TSH in the middle-aged population.

show abstract

“…Compared with traditional anchorage, such as extraoral headgear, TPA (transpalatal arch) or oral implant, micro-screws possess the advantages of small size, simple surgical insertion procedure, straightforward removal, lower cost and independence from patient compliance. 1,2 However, orthodontic micro-screws tend to suffer a failure rate of about 10% to 30%, which is much higher than conventional implants. 3 The surrounding bone of micro-screws after insertion needs time to heal in order to provide stable support.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the long-term stability of micro-screws under different loading protocols: a systematic review

Zhang

Bao

et al. 2019

Braz. oral res.

View full text Add to dashboard Cite

The aim of this systematic review was to investigate the association between the different factors of loading protocols and the long-term stability of micro-screws from biomechanical and histological viewpoints. Searches were performed on PubMed, Embase, Cochrane Library, Wanfang and CNKI databases for animal experiments comparing loading protocols and the long-term stability of micro-screws. Among 1011 detected papers, 16 studies met the eligibility criteria and were selected for analysis. Most studies showed medium methodological quality for evaluation of micro-screws' long-term stability. Five studies reported that loading would not destroy the long-term stability of micro-screws. Three studies indicated that low-intensity immediate loading or a 3-week minimal healing time was acceptable. Two studies reported that the loading magnitude was a controversial issue with regard to the micro-screws' long-term stability. Two studies suggested that counterclockwise loading could decrease the long-term stability of micro-screws. In conclusion, immediate loading below 100g force, healing time greater than 3 weeks, regular loading below 200g force and a clockwise direction of force supported the long-term stability of micro-screws. Further studies relating to the combination of varying loading conditions will be needed.

show abstract

Failure load and stress analysis of orthodontic miniscrews with different transmucosal collar diameter

Cited by 60 publications

References 37 publications

Multifunctional Templates for Minimized Osteotomy, Implantation, and Palatal Distraction with a Mini-Screw-Assisted Expander in Schizodontism and Maxillary Deficit

Multifunctional Templates for Minimized Osteotomy, Implantation, and Palatal Distraction with a Mini-Screw-Assisted Expander in Schizodontism and Maxillary Deficit

Influence of General Mineral Condition on Collagen-Guided Alveolar Crest Augmentation

Evaluation of the long-term stability of micro-screws under different loading protocols: a systematic review

Contact Info

Product

Resources

About