Dental Materials
Volume 27, Issue 10 , Pages 955-963, October 2011
Abstract
Objectives
This retrospective longitudinal
study investigated the longevity of posterior restorations placed in a
single general practice using 2 different composites in filler
characteristics and material properties: P-50 APC (3M ESPE) with 70
vol.% inorganic filler loading (midfilled) and Herculite XR (Kerr) with 55
vol.% filler loading (minifilled).
Methods
Patient
records were used for collecting data. Patients with at least 2
posterior composite restorations placed between 1986 and 1990, and still
in the practice for regular check-up visits, were selected. 61 patients
(20 male, 41 female, age 31.2–65.1) presenting 362 restorations (121
Class I, 241 Class II) placed using a closed sandwich technique were
evaluated by 2 operators using the FDI criteria. Data were analyzed with
Fisher's exact test, Kaplan–Meier statistics, and Cox regression
analysis (
p<
0.05).
Results
110
failures were detected. Similar survival rates for both composites were
observed considering the full period of observation; better performance
for the midfilled was detected considering the last 12 years. There was
higher probability of failure in molars and for multi-surface
restorations.
Significance
Both evaluated composites
showed good clinical performance over 22 years with 1.5% (midfilled) and
2.2% (minifilled) annual failure rate. Superior longevity for the
higher filler loaded composite (midfilled) was observed in the second
part of the observation period with constant annual failure rate between
10 years and 20 years, whereas the minifilled material showed an
increase in annual failure rate between 10 years and 20 years,
suggesting that physical properties of the composite may have some
impact on restoration longevity.
Comments