Failure rates for stainless steel versus titanium alloy infrazygomatic crest bone screws: A single-center, randomized double-blind clinical trial
| dc.contributor.author | Chang, Chris | |
| dc.contributor.author | Lin, Joshua S. | |
| dc.contributor.author | Roberts, W. Eugene | |
| dc.contributor.department | Orthodontics and Oral Facial Genetics, School of Dentistry | en_US |
| dc.date.accessioned | 2019-10-25T19:29:32Z | |
| dc.date.available | 2019-10-25T19:29:32Z | |
| dc.date.issued | 2019-01 | |
| dc.description.abstract | Objectives: To compare failure rates for stainless steel (SS) and titanium alloy (TiA) bone screws (BSs) placed in the infrazygomatic crest (IZC). Materials and Methods: A total of 386 consecutive patients (76 male, 310 female; mean age 24.3 years, range 10.3–59.4 years) received IZC BSs (SS or TiA) via a double-blind, split-mouth design. BSs penetrated attached gingiva (AG) or moveable mucosa (MM) with 5 mm of soft tissue clearance. All BSs were immediately loaded and reactivated monthly with ≤14 oz (397 g or 389 cN) applied directly to the upper archwire bilaterally for 6 months to retract the maxilla to correct Class II or bimaxillary protrusion. Results: Of the 772 devices, there were 49 (6.3%) failures: 27 SS (7.0%) and 22 TiA (5.7%). The 1.3% difference was not statistically significant (P = .07). There was no significant relationship between SS or TiA failures relative to (1) right vs left side, (2) unilateral vs bilateral, or (3) age at failure. Significantly (P < .05) increased failure rates were noted for SS screws in only two subgroups: AG site (7.4%) and right side (7.8%). Unilateral failure occurred in 21 patients (5.4%), and bilateral failures occurred in 14 of the total 772 patients (1.8%). Conclusions: The overall success rate of 93.7% indicates that both SS and TiA are clinically acceptable for IZC BSs. | en_US |
| dc.eprint.version | Final published version | en_US |
| dc.identifier.citation | Chang, C. H., Lin, J. S., & Roberts, W. E. (2019). Failure rates for stainless steel versus titanium alloy infrazygomatic crest bone screws: A single-center, randomized double-blind clinical trial. The Angle Orthodontist, 89(1), 40–46. https://doi.org/10.2319/012518-70.1 | en_US |
| dc.identifier.uri | https://hdl.handle.net/1805/21283 | |
| dc.language.iso | en | en_US |
| dc.publisher | The Angle Society | en_US |
| dc.relation.isversionof | 10.2319/012518-70.1 | en_US |
| dc.relation.journal | The Angle Orthodontist | en_US |
| dc.rights | Publisher Policy | en_US |
| dc.source | Publisher | en_US |
| dc.subject | infrazygomatic crest | en_US |
| dc.subject | bone screws | en_US |
| dc.subject | skeletal anchorage | en_US |
| dc.title | Failure rates for stainless steel versus titanium alloy infrazygomatic crest bone screws: A single-center, randomized double-blind clinical trial | en_US |
| dc.type | Article | en_US |