Background: The fixture thread depth reportedly influences the primary stability of dental implant, but its effect on the positional accuracy in immediate implant placement has not been reported previously. Materials and Methods: Fifty-six single-rooted, anterior and premolar teeth were extracted from six human cadavers, followed by installing either regular-threaded implants (RT group, N = 30) or deep-threaded implants (DT group, N = 26) completely relying on the surgical guide. Optical impressions taken after osteotomy and fixture installation were superimposed with the preoperative virtual planning data to measure the vertical, angular, platform and apex deviations that occurred during osteotomy and installation. Results: While the osteotomy deviations were similar between the two groups, the angular and apex deviation of the DT group (2.67 ± 2.56°; 1.04 ± 0.49 mm, respectively) were significantly larger than those of the RT group (1.61 ± 1.04°; 0.67 ± 0.41 mm, respectively) during installation (p <.05). When the installation deviations were analysed in the anterior and premolar areas separately, the angular, platform and apex deviations of the DT group (3.05 ± 3.26°; 0.75 ± 0.32 mm; 1.08 ± 0.56 mm, respectively) were significantly larger than those of the RT group (1.56 ± 0.73°, 0.59 ± 0.28 mm; 0.62 ± 0.38 mm, respectively) in the anterior site (p <.05), whereas there was no significant intergroup difference in the premolar site. Conclusion: In immediate-implant surgery, using an implant with a deeper thread might increase the deviations during installation, especially in the anterior area.
|Number of pages||11|
|Journal||Clinical Oral Implants Research|
|Publication status||Published - 2023 Feb|
Bibliographical noteFunding Information:
We are very grateful to the six people who donated their bodies so that they could be used in this research. This work was supported by a grant from the National Research Foundation of Korea funded by the Korea Government (MSIT) (Grant No. 2022R1A2C2005537).
© 2022 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.
All Science Journal Classification (ASJC) codes
- Oral Surgery