[Quantitative analysis of occlusal changes in posterior partial fixed implant supported prostheses]

Area of Science:

• Dentistry
• Biomaterials Science
• Biomechanics

Background:

• Implant-supported prostheses are crucial for restoring function in partially edentulous patients.
• Understanding occlusal dynamics is vital for long-term implant success and patient comfort.
• Changes in occlusion over time can impact the longevity and performance of implant restorations.

Purpose of the Study:

• To analyze longitudinal changes in occlusal force distribution and contact in posterior partial fixed implant-supported prostheses.
• To provide data for precise occlusion design, adjustment, and maintenance of implant prostheses.
• To establish a clinical reference for the critical early period after implant prosthesis placement.

Main Methods:

• Prospective study of patients with posterior partial fixed implant-supported prostheses.
• Occlusal examinations using articulating paper and T-Scan III at 2 weeks, 3, 6, and 12 months post-settling.
• Measurement of occlusal contact, occlusion time, and relative occlusal forces for implant prostheses and adjacent teeth.

Main Results:

• Thirty-seven prostheses in 33 patients were followed for an average of 8.3 months.
• Initially lower relative occlusal forces on implant prostheses significantly increased by 3 months, normalizing relative to control teeth.
• Implant prosthesis occlusion time ratio also significantly increased within the first 3 months, with no significant changes thereafter.

Conclusions:

• Posterior implant prostheses exhibit significant changes in light contact and time-delayed occlusion within the first three months.
• Key changes include earlier occlusal contact initiation and increased occlusal force on the implant prosthesis.
• Clinical monitoring of posterior implant prostheses occlusion is recommended at the three-month follow-up.