Three-Dimensional Finite Element Analysis for Stress Distribution During Intrusion and Retraction Using Orthodontic Mini-implants
Mohammed Abdul Naqeed,
Swaroopa Rani Ponnada,
Vivek Reddy Ganugapanta
Issue:
Volume 7, Issue 1, June 2021
Pages:
1-9
Received:
8 December 2020
Accepted:
29 December 2020
Published:
26 April 2021
Abstract: Background and Objectives: the study was conducted to evaluate the levels of stress produced in and around implants when placed at different sites for retraction and intrusion of maxillary anteriors. The other objective was to evaluate stress levels produced at implant bone interface when mini implants were placed at different angulations at the same site. Materials and Methodology: Finite element model of the maxilla and maxillary dentition was constructed using the CT skull of subject used in the study. All the accessories used like mini-implants, stainless steel wire, coil springs etc were scanned separately for obtaining detailed anatomic features. The force was given between retraction hook and mini -implant using NITI closed coil spring for intrusion and retraction of maxillary anterior teeth. The basic mechanical factors i.e. the stresses developed in mini implant, the angle of insertion of the mini implant into the bone surface were analyzed. Finite Element model was generated by Hyper mesh 9.0 software. Analysis was carried out by using Ansys 12.1 software. Results and Conclusion: All the set objectives were accomplished at the end of the study which included complete closure of extraction space by retraction and intrusion in the models. The following conclusions were drawn: The least stress was seen on an implant at middle third, when inserted at an angle of 800 to the bone surface, with application of 50-100mg of intrusive force on anterior implant and 200 gms of retractive force on posterior implant.
Abstract: Background and Objectives: the study was conducted to evaluate the levels of stress produced in and around implants when placed at different sites for retraction and intrusion of maxillary anteriors. The other objective was to evaluate stress levels produced at implant bone interface when mini implants were placed at different angulations at the sa...
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Research Progress on the Mechanism and Preventive Measures of Diabetes Induced Peri-implantitis
Wanyun Lin,
Chen Xie,
Chunyi Cao,
Shengping Cao,
Xiaoting Li,
Tingting Li,
Yujia Zhai,
Jingni Guo,
Vannesa Bongani Muyeleka,
Zhuling Guo
Issue:
Volume 7, Issue 1, June 2021
Pages:
10-14
Received:
28 April 2021
Accepted:
17 May 2021
Published:
27 May 2021
Abstract: Background: Diabetes mellitus has been shown to be an associated risk factor for peri-implantitis. Peri-implantitis has become the leading cause of implant failure. Objective: To ensure the postoperative efficacy of diabetic patients and avoid the occurrence of peri-implantitis, research progress on the mechanism and preventive measures of diabetes induced peri-implantitis were elaborated. Methods: With "diabetes mellitus or diabetes or DM, peri-implantitis, implant, osseointegration" as the search terms, related articles published during 2013-2021 in PubMed, CNKI, ScienceDirect and other databases were searched. Results: The changes in the type and proportion of bacteria around implants in diabetic patients break the balance between bacteria and host defense system. Diabetic patients with insulin resistance and persistent hyperglycemia inhibit osteoblast differentiation, induce osteoclast activation and make adverse effects on osseointegration. The immune inflammatory state and local microvascular lesions of the body slow down postoperative tissue healing and induce peri-implantitis. According to the relevant mechanisms, many experiments have achieved good results in reducing the incidence of peri-implantitis in patients with diabetes through plaque control, blood glucose management and implant interface improvement. Conclusion: Diabetic patients have a higher risk of peri-implantitis, so implant patients with diabetes mellitus should undertake related prevention and treatment to reduce the risk of peri-implantitis.
Abstract: Background: Diabetes mellitus has been shown to be an associated risk factor for peri-implantitis. Peri-implantitis has become the leading cause of implant failure. Objective: To ensure the postoperative efficacy of diabetic patients and avoid the occurrence of peri-implantitis, research progress on the mechanism and preventive measures of diabetes...
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