Int J Oral Maxillofac Implants. 2024 Jun 21(3):77-86. doi: 10.11607/jomi.10578.
To introduce a new method for labiopalatal positioning and angulation of immediately placed dental implants in the anterior maxilla with relation to the type of abutment used (straight/angled abutment).
CBCT scans from the database of a private practice were searched for patients who received immediate implants in the anterior maxilla. After superimposition of the initial and postoperative scans, the incisor root angle (IRA), incisor implant angle (IIA), and the difference between these angles were measured. An assessment was then made about whether the implant position would be within the safe angle or not. Age, sex, tooth/implant site, and type of prosthetic abutment (straight/angled) were retrieved from the patients' records.
A total of 74 patients with 95 immediate implants altogether were selected for analysis. In regard to the type of abutment, 76 (80%) were straight, and 19 abutments (20%) were angled. Regardless of abutment type, 72 implants (75.8%) were placed within the safe angle, while 23 implants (24.2%) were placed outside it. All 19 implants with angled abutments were placed outside the safe angle. There were statistically significant associations between placement within the safe angle and type of abutment (P < .001; OR = 19), IRA (P < .001; effect size = 0.904), difference between IIA and IRA (P < .001; effect size = 1.209), and sex (P < .001; OR = 2.995). There was no statistically significant association between placement within the safe angle and IIA (P = .757, effect size = 0.063), site (P = .200; effect size = 0.184 ), or age (P = .387; effect size = 0.208). There was a statistically significant association between the type of abutment and the IRA (P = .001; effect size = 0.762) as well as the difference between IIA and IRA (P < .001; effect size = 1.056).
The safe angle concept can be used as a reliable planning tool to determine the correct implant positioning for immediate implant placement in the anterior maxilla. Applying the safe angle concept will reduce the need for angled abutments for prosthetic correction.
介绍一种新的方法，用于在前上颌骨中定位和确定与使用的基台类型（直基台/角度基台）相关的即刻植入物的唇腭向位置。
从一家私人诊所的数据库中搜索接受前上颌即刻植入的患者的 CBCT 扫描。在对初始扫描和术后扫描进行叠加后，测量切牙牙根角度（IRA）、切牙种植体角度（IIA）和这两个角度之间的差异。然后评估植入物的位置是否在安全角度内。从患者记录中检索年龄、性别、牙齿/种植体部位和修复基台类型（直基台/角度基台）。
共选择了 74 名患者的 95 个即刻植入物进行分析。关于基台类型，76 个（80%）为直基台，19 个（20%）为角度基台。无论基台类型如何，72 个（75.8%）植入物都位于安全角度内，而 23 个（24.2%）植入物都位于安全角度外。所有 19 个使用角度基台的植入物都位于安全角度之外。植入物位于安全角度内与基台类型（P <.001；OR = 19）、IRA（P <.001；效应量 = 0.904）、IIA 和 IRA 之间的差异（P <.001；效应量 = 1.209）和性别（P <.001；OR = 2.995）之间存在统计学显著关联。植入物位于安全角度内与 IIA（P =.757，效应量 = 0.063）、部位（P =.200；效应量 = 0.184）或年龄（P =.387；效应量 = 0.208）之间无统计学显著关联。基台类型与 IRA（P =.001；效应量 = 0.762）以及 IIA 和 IRA 之间的差异（P <.001；效应量 = 1.056）之间存在统计学显著关联。
安全角度概念可用作在前上颌即刻种植中确定正确植入物定位的可靠规划工具。应用安全角度概念将减少对修复性矫正的角度基台的需求。
