Annamalai Indra, Bharathan Khaniya, Anbarasu Prema, Subramanian Saravana-Kumar
Department of Orthodontics, Chettinad Dental College and Research Institute, Tamil Nadu, India.
Department of Orthodontics, RVS Dental College and Hospital, Tamil Nadu, India.
J Clin Exp Dent. 2022 Dec 1;14(12):e1000-e1007. doi: 10.4317/jced.59903. eCollection 2022 Dec.
Knowledge of bone density in maxilla and mandible will allow the clinician to plan the anchorage strategies and placement of implants with necessary precautions. The study aims to evaluate the deflection changes of titanium alloy self-drilling mini implants from the intended path that occurs during placement in varying bone densities.
63 titanium alloy self-drilling mini implants of the lengths 6mm, 8mm, and 10mm with diameter of 1.3mm were placed in three homogenous solid rigid polyurethane foam (saw bone) with bone densities of 20pcf, 30pcf, and 40pcf simulating anatomic sites in maxilla and mandible. 7mini implants of each length in all bone densities were tested for study. The implants were inserted perpendicularly into artificial bone block held in a custom made stand. The bone blocks were then radiographically exposed and the deviation of the long axis of the implantfrom a true vertical line was measured.
There was a decrease in deflection of the mini implant with increase in density. On the other hand, increase in length resulted in increase in the amount of deflection.
Longer mini implants can be used in less dense bone as in maxilla, whereas shorter mini implants can be used in high dense bone as in mandible to increase the stability and success rate of implants. Bone density and implant length play a role in deflection of mini implant from its intended path of insertion. Orthodontic Mini implants, deflection, bone density, anchorage.
了解上颌骨和下颌骨的骨密度将有助于临床医生规划锚固策略并在采取必要预防措施的情况下植入种植体。本研究旨在评估钛合金自攻微型种植体在植入不同骨密度区域时相对于预期路径的偏斜变化。
将63枚长度为6mm、8mm和10mm、直径为1.3mm的钛合金自攻微型种植体植入三种具有均匀密度的硬质聚氨酯泡沫（仿骨材料）中，其骨密度分别为20pcf、30pcf和40pcf，模拟上颌骨和下颌骨的解剖部位。每种长度的微型种植体在所有骨密度条件下各选取7枚进行研究。将种植体垂直插入固定在定制支架中的人工骨块中。然后对骨块进行X线照射，并测量种植体长轴相对于真正垂直线的偏差。
随着骨密度增加，微型种植体的偏斜度减小。另一方面，种植体长度增加会导致偏斜量增加。
较长的微型种植体可用于上颌骨等骨密度较低的部位，而较短的微型种植体可用于下颌骨等高骨密度部位，以提高种植体的稳定性和成功率。骨密度和种植体长度会影响微型种植体相对于预期植入路径的偏斜。正畸微型种植体、偏斜、骨密度、锚固。
