Introduction: The infrazygomatic crest (IZC) is an alternative site for miniscrew anchorage. It is important to analyze the anatomy of the region during preoperative planning to minimize the risk of unwanted tooth movement and injury to the vital structures. The literatures on the clinical application of miniscrew in IZC is scarce. Objective: To determine bone thickness, height and angle of insertion of miniscrew in the IZC region. Materials and methods: This cross-sectional observational comparative study included 44 patients above18 years. IZC bone thickness and height of miniscrew insertion were measured on cone-beam computed tomographic (CBCT) records. Student t-test was done to compare the bone thickness and insertion height between gender and between sides. Results: Infrazygomatic crest bone thickness when measured at an angle of 40° to 75° and 11 to 17 mm above the occlusal plane of the maxillary first molar was 3 to 9 mm. There was no significant gender and side variation in bone thickness of IZC and insertion height. Conclusion: Infrazygomatic crest thickness increases with the increase in insertion angle and the decrease in height. The optimal site for miniscrew placement in IZC in an adult is at the angle of 70°and 13 mm from the occlusal plane in the Nepali sample.
Dangal, Rajju; Shrestha, Rabindra Man; Dhakal, Jyoti; Shrestha, Sujita; Gupta, Alka; and Shah, Shreya
"Comparison of Bone Thickness in Infrazygomatic Crest Area at Various Miniscrew Insertion Angles: A Cone-beam Computed Tomographic Study,"
Taiwanese Journal of Orthodontics: Vol. 34:
4, Article 2.
https://doi.org/10.38209/2708-2636.1324 Available at: https://www.tjo.org.tw/tjo/vol34/iss4/2
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