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Published on: October 18, 2021
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Insertion Torque of Variable-Thread Tapered Implants in the Posterior Maxilla: A Clinical Study
Habib L Abi-Aad1, Fadi I Daher2, Nadim Z Baba3
1Department of Prosthodontics, Faculty of Dental Medicine, Lebanese University, Hadath, Lebanon.
Summary
Insertion torque values (ITVs) in the posterior maxilla are significantly affected by bone quality and implant location. Variable-thread implants achieved adequate ITVs in poor bone, supporting immediate loading protocols.
Area of Science:
- Dental Implantology
- Biomaterials Science
- Oral Surgery
Background:
- Primary stability is crucial for dental implant osseointegration, particularly in challenging conditions like poor bone quality or immediate loading protocols.
- Insertion torque values (ITVs) are considered a key prognostic indicator for osseointegration in immediate loading scenarios for maxillary implants.
Purpose of the Study:
- To evaluate the insertion torque values (ITVs) achieved by a variable-thread tapered implant in the posterior maxilla.
- To determine the influence of bone quality, implant dimensions, bicortical anchorage, and implant location on ITVs.
Main Methods:
- 173 variable-thread tapered implants were placed in 26 patients in posterior maxillary edentulous sites.
- Bone quality was subjectively assessed (Misch criteria D1-D4), and ITVs were measured using a manual torque wrench.
- Statistical analyses included univariate and multivariate assessments.
Main Results:
- The overall mean ITV was 44.5 ± 23.0 Ncm.
- Bone quality significantly impacted ITVs, with higher values in denser bone (D2: 65.5 Ncm) compared to poorer bone (D4: 36.6 Ncm).
- Implant location also significantly affected ITVs, whereas implant dimensions and apical anchorage did not.
Conclusions:
- Insertion torque values for variable-thread implants in the posterior maxilla are significantly influenced by bone quality and implant position.
- Despite variations in bone quality, the mean ITVs achieved in poor bone were within the acceptable range for immediate loading.
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