Biomechanical study of transsacral-transiliac screw fixation versus lumbopelvic fixation and bilateral triangular fixation for "H"- and "U"-type sacrum fractures with traumatic spondylopelvic dissociation: a finite element analysis study.

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Abstract

[Indexed for MEDLINE] Conflict of interest statement: The authors declare that they have no competing interests. 8. J Investig Clin Dent. 2018 Aug;9(3):e12331. doi: 10.1111/jicd.12331. Epub 2018 Mar 6. Success rates and factors associated with failure of temporary anchorage devices: A prospective clinical trial. Aly SA(1), Alyan D(1), Fayed MS(2), Alhammadi MS(3), Mostafa YA(2). Author information: (1)Faculty of Dentistry, Future University, Cairo, Egypt. (2)Department of Orthodontics and Dentofacial Orthopedics, Cairo University, Cairo, Egypt. (3)Department of Preventive Dental Science, College of Dentistry, Jazan University, Jazan, Saudi Arabia. AIM: The objective of the present study was to investigate success rates and associated factors affecting temporary anchorage device (TAD) failure in different biomechanical applications. METHODS: A total of 180 TADs were used as a part of 82 patients' treatment plan (24 males and 58 females); their mean age was 21.41 years. Three types of TADs were used: 50 (3M ESPE, Neuss, Germany), 56 (Bone screw; Jeil Medical, Seoul, Korea), and 74 (Morelli, Sorocaba, Brazil). Eight maxillary and four mandibular sites were selected for insertion. Three different lengths (6, 8, and 10 mm) and three different diameters (1.5, 1.6, and 1.8 mm) were used. The force levels were set at 50, 100, 150, 200, and 250 g. Patient-, implant-, and operator-dependent factors were evaluated throughout the 266 days of function. Qualitative variables were described by proportions and percentages and analyzed using χ2 test. RESULTS: The overall success rate was 82.2%. The higher age group showed a significantly higher success rate. Oral hygiene showed a statistically-significant (P ˂ .05) difference between both success and failure groups. All other patient-related factors showed no significant differences. Regarding force levels used, the highest success rate was in 250 g and the lowest was in 100 g. There were no significant differences between both groups regarding other implant- and operator-related factors. CONCLUSIONS: Temporary anchorage devices have a good success rate and are beneficial to be integrated in orthodontic treatment planning. Patient age, oral hygiene, and force level are the most significant factors affecting TAD success. © 2018 John Wiley & Sons Australia, Ltd. DOI: 10.1111/jicd.12331