Two Interforaminal Implants in an Immediate or Delayed Loading Protocol for the Elderly

Hypothesis:

Especially for gerontoprosthetics, the Locator® abutment system offers the possibility of a minimally invasive retention of prosthetic total restorations of edentulous mandibles. The reduced number of 2 interforaminal implants is intended to ensure implantological anchoring with minimal surgical, technical, financial and time expenditure.

Research Question:

How safe is this minimally invasive and cost-effective implant and anchoring system in terms of long-term outcome? Are the two implant-prosthetic procedures (immediate versus late restoration) different in terms of implant survival time?

Materials and methods

Enrollment:

• 20 patients without relevant pre-existing conditions, from the age of 60 years
• edentulous mandible, alveolar ridge atrophy

Statistical Analysis:

When planning the study, it is estimated that bone resorption in the peri-implant area of the immediate-care implants is greater than in the late-treated implants. 10 patients per group are required with a t-test (α = 0.05) and a power of 80% if the null hypothesis is formulated as follows: -difference of means is 0 and the alternative - expected difference of means is 1mm, common standard deviation is 0.75.

Collective A (open healing - immediate loading): Insertion of a new, prefabricated total mandibular prosthesis on the day of the operation immediately postoperatively after screwing in the Locator® abutments.

Polymerization of the corresponding Locator® matrices in the newly incorporated lower jaw denture in the patient's mouth.

Collective B (closed implant healing - conventional loading): 3 months after implantation Exposure of the primary closed implants. Immediately following insertion of the prefabricated full-thickness UK prosthesis and retention by the implants using Locator® abutments.

Test parameters:

• Intraoperative torque measurement in Ncm
• Radiological measurement of periimplant bone height using orthopantomogram
• 4-point measurement of peri-implant probing depth using WHO periodontal probe. The measurement is mesial, distal, buccal and lingual of the implant.
• Measurement of bleeding on probing (parameters of peri-implant inflammation) using the WHO periodontal probe.
• Analysis of implant stability using the Periotest® and Osstell® measuring instruments according to a standardized scheme: The strength values are performed in a measuring range consisting of a straight line through the center of the implant and the resulting 180 ° circle sector anterior to this line results. After multiple measurements (5-fold) the lowest numerical value for the Periotest® and for the RFA (Osstell®) the lowest value documented.

Inclusion criteria

• 60 or older
• edentulous lower jaw with advanced atrophy
• poor fit and retention even with a new prosthesis

Exclusion criteria

• poor general condition (ASA classification grade IV or more), or
• high risk situations for implant therapy (e.g. disorders of bone metabolism due to antiresorptive therapy)