Abstract:Objectives
To date, the clinical stability of dual-thread orthodontic miniscrews has not been studied. This study aimed to compare the primary stability and long-term clinical success rate of dual-thread and cylindrical orthodontic miniscrews and to examine the association between various clinical factors and the success rate of miniscrews.
Materials and Methods
A total of 145 cylindrical and 135 dual-thread miniscrews were i… Show more
“…The affection of sex was also found to be controversial. While some studies reported that there were no statistical differences [ 58 – 60 , 65 ], others reported that males had a higher success rate due to higher bone density [ 59 , 62 ].…”
Section: Complications Under Loadingmentioning
confidence: 99%
“…Among risk factors from patients, the association between miniscrew failure and age was not consistent. Some studies showed no relationship between age and failure [58][59][60]; whereas others found that age could affect the miniscrew stability since there was poorer quality and higher bone turnover rate in growing patients compared to adults, affecting optimal mechanical miniscrew stability in adolescents [61][62][63][64][65]. Therefore, more attention should be taken to the miniscrew placement in younger patients.…”
Miniscrew has been used widely as an effective orthodontic anchorage with reliable stationary quality, ease of insertion and removal techniques, immediate or early loading, flexibility in site insertion, less trauma, minimal patient cooperation, and lower price. Nonetheless, it is not free of complications, and they could impact not only the miniscrew success rate but also patients’ oral health. In this article, literature was searched and reviewed electronically as well as manually to evaluate the complications of orthodontic miniscrew. The selected articles are analyzed and subcategorized into complications during and after insertion, under loading, and during and after removal along with treatment if needed according to the time. In addition, the noteworthy associated factors such as the insertion and removal procedures, characteristics of both regional and local anatomic structures, and features of the miniscrew itself that play a significant role in the performance of miniscrews are also discussed based on literature evidence. Clinicians should notice these complications and their related factors to make a proper treatment plan with better outcomes.
“…The affection of sex was also found to be controversial. While some studies reported that there were no statistical differences [ 58 – 60 , 65 ], others reported that males had a higher success rate due to higher bone density [ 59 , 62 ].…”
Section: Complications Under Loadingmentioning
confidence: 99%
“…Among risk factors from patients, the association between miniscrew failure and age was not consistent. Some studies showed no relationship between age and failure [58][59][60]; whereas others found that age could affect the miniscrew stability since there was poorer quality and higher bone turnover rate in growing patients compared to adults, affecting optimal mechanical miniscrew stability in adolescents [61][62][63][64][65]. Therefore, more attention should be taken to the miniscrew placement in younger patients.…”
Miniscrew has been used widely as an effective orthodontic anchorage with reliable stationary quality, ease of insertion and removal techniques, immediate or early loading, flexibility in site insertion, less trauma, minimal patient cooperation, and lower price. Nonetheless, it is not free of complications, and they could impact not only the miniscrew success rate but also patients’ oral health. In this article, literature was searched and reviewed electronically as well as manually to evaluate the complications of orthodontic miniscrew. The selected articles are analyzed and subcategorized into complications during and after insertion, under loading, and during and after removal along with treatment if needed according to the time. In addition, the noteworthy associated factors such as the insertion and removal procedures, characteristics of both regional and local anatomic structures, and features of the miniscrew itself that play a significant role in the performance of miniscrews are also discussed based on literature evidence. Clinicians should notice these complications and their related factors to make a proper treatment plan with better outcomes.
“…In addition, the anchorage on micro‐implants prevents unwanted movements of tooth elements that were used in conventional orthodontic steps. Thus, offering an alternative optimal solution to orthognathic surgery in cases where dental anchorage may result in undesirable adverse effects such as vertical dimension changes produced by the use of conventional inter‐maxillary forces 2 …”
Section: Introductionmentioning
confidence: 99%
“…Additionally, it is believed that primary stability is essential for the success of mini‐screws 2,3 . Risk factors for the stability of mini‐screws can be divided into four categories: host‐related risks (age, sex, oral hygiene, cortical bone thickness, root proximity, and the location of the insertion ‘maxilla or mandible’, mini‐screw‐related risks (shape, diameter, and length of the screws), surgical management‐related risks (insertion torque, angle, placement height in the movable mucosa or attached gingiva, need for pre–drilling) 3–5 …”
Background and ObjectivesThe intrusion of anterior teeth is a routine procedure in orthodontics, which has been performed efficiently with the help of mini‐screws in the anterior region, especially the upper maxilla. This study aimed to investigate the effect of insertion angle and sociodemographic features on the success rate of mini‐screws at the anterior maxillary region.Materials and MethodsTwenty‐nine patients (18 Females and 11 Males) aged 18‐40 years old were involved in the current study. A split‐mouth design was carried out in which recruited patients needed bilateral anterior screws at the labial bone in the region of the incisor for the intrusion of upper anterior incisor teeth as part of their orthodontic treatment with a fixed appliance (upper right side received 90‐degree insertion angle mini‐screw and 45° for left side) using a surgical guide fabricated from patients CBCT and intraoral scans. The mini‐screws were inserted at the attached gingiva bilaterally to achieve intrusion of upper anterior teeth with a power chain ligated from the main archwire to the anterior min‐implants. The patient was recalled monthly for orthodontic appliance activation and screw assessment for 6 months. The intrusion force was 15 g on each side.ResultsThe results of the study showed that screw stability was higher in the male group than the female group at the 6th monthly follow‐up visit with a statistically significant difference between both genders (P = .044). Concerning insertion angle, results showed a statistically significant difference between 45° and 90° as an insertion angle with a P‐value <.01 in most of the follow‐up months.ConclusionThis study found that male patients with mini‐screws inserted at 90° showed greater screw stability over time.
“…A previous study used tapered, self-tapping, ϕ2.0 × 6 mm OASs, and reported ITs of 25.6 ± 5.5 Ncm [8], whereas another study used cylindrical, self-drilling, ϕ1.5 × 7 mm OASs in the maxillary buccal alveolar area and reported ITs of 6.0 ± 3.2 Ncm [9]. Thus, the IT values vary greatly with the placement method and OAS design (screw diameter, length, and tapered or cylindrical form) [1,[5][6][7][8][9][10][11][12][13][14][15]. Therefore, clinicians may be hesitant to apply these values in practice.…”
The optimal insertion torque (IT) for orthodontic anchoring screws (OASs) was hypothesized to vary with OAS features and insertion methods. This review examines the indexed English literature, to determine the appropriate IT range for OAS success based on area of insertion and OAS features. Eleven original articles with OAS placement in humans including IT and success rate were selected and were used to evaluate the relationships among IT, success rates, screw design, and placement methods at different sites. The ITs and success rates ranged from 6.0 ± 3.2 to 15.7 ± 2.3 Ncm and from 62.5 to 100.0% in the upper and lower buccal alveolar areas, respectively. For the mid-palatal area, the range was 14.5 ± 1.6 to 25.6 ± 5.5 Ncm and 83.0 to 100.0%, respectively. ITs of 5–12 and 6–14 Ncm were found to be optimal for the commonly used φ1.5–1.7 mm OASs in the upper and lower interproximal areas, respectively. In the mid-palatal suture area, ITs of 11–16 and 20–25 Ncm were considered suitable for tapered φ1.5 mm and φ2.0 mm OASs, respectively. Although identified optimal IT ranges deserve the recommendations, care must be taken to monitor the IT during placement constantly.
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