Two-Step Immediate Loading of Mandibular Overdentures Retained by Mini-implants: A Prospective Clinical Study
AUTHOR
-- By Park JH, Shin SW, Lee JY.
Purpose: This
study aimed to evaluate treatment outcomes of mandibular overdentures retained
by two different mini-implant systems with ball attachments under a two-step
immediate loading protocol.
Materials and methods: This clinical trial investigated treatment outcomes of mandibular
mini-implant overdentures in 45 edentulous patients. MDI implants (3M ESPE) and
SlimLine implants (Dentium) were randomly selected for placement in the
anterior mandible in each group (MDI = 21; SlimLine = 24) with a flapless
surgical approach. The side of the tissue in the region of the complete
mandibular denture where mini-implants were placed was immediately relined with
soft reliner (COE-SOFT). The female components were attached on the dentures 2
months after implant placement. Clinical and radiographic data were collected
during follow-up. Statistical analyses were performed using SPSS software
version 22.0 (α = .05).
Results: A total
of 177 mini-implants were inserted in the anterior mandibles of 45 totally
edentulous patients. There were five implant failures (97.2% success rate) and
no significant differences between the two implant groups. Most mini-implants
showed stable initial Periotest values (a mean ± standard deviation of 1.03 ±
3.65 mm) and a mean marginal bone loss of 0.50 ± 0.75 mm at 12 months. Multiple
regression analysis revealed that implants ≤ 2.4 mm in diameter had higher
Periotest values than those ≥2.8 mm. Intial Periotest values significantly
influenced implant failure (P < .05).
Conclusion: There
were no significant differences in treatment outcomes between patients treated
with MDI or SlimLine implants. Mini-implants with wider diameters showed higher
initial stability than those with narrow diameters, which may influence implant
survival.
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