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[All-on-4 occlusion study: using T-Scan Ⅲ occlusal analysis system].

F F Ma1, Y Lin2, P Di2

  • 1The First Outpatient Dental Clinic, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100034, China.

Zhonghua Kou Qiang Yi Xue Za Zhi = Zhonghua Kouqiang Yixue Zazhi = Chinese Journal of Stomatology
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All-on-4 dental implants show concentrated occlusal forces on premolar and anterior implant areas during maximum intercuspation. Protrusion forces focus on anterior regions, with varied patterns in lateral excursions, impacting All-on-4 rehabilitation outcomes.

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Area of Science:

  • Dental Implantology
  • Biomechanical Engineering
  • Prosthodontics

Background:

  • All-on-4 rehabilitation offers a fixed full-arch solution for edentulous patients.
  • Understanding occlusal force distribution is crucial for long-term implant success and patient comfort.
  • Previous studies have not fully characterized occlusal dynamics across different positions in All-on-4 patients.

Purpose of the Study:

  • To analyze occlusal force distribution in All-on-4 patients.
  • To evaluate occlusion time characteristics at various positions.
  • To utilize the T-Scan III occlusal analysis system for precise measurements.

Main Methods:

  • Thirteen volunteers with All-on-4 rehabilitation participated.
  • The T-Scan III system recorded occlusal forces and timing.
  • Data collected at intercuspal, protrusive, and lateral excursive positions.

Main Results:

  • At maximum intercuspation, premolar and anterior implant areas bore the majority of occlusal forces (64.0±6.7%).
  • Protrusive forces concentrated significantly in the anterior region (11, 12, 21, 22) (90.4±27.7%).
  • Lateral occlusal patterns exhibited considerable variability, with mixed single-tooth and group function observed.

Conclusions:

  • Implant areas, particularly premolar and anterior regions, act as occlusal force centers in maximum intercuspation.
  • Anterior implant regions are primary force recipients during protrusion.
  • The diverse nature of lateral occlusal patterns necessitates individualized treatment considerations for All-on-4 restorations.