A multipractice clinical evaluation of an ORMOCER restorative--2-year results.
OBJECTIVE
This ongoing prospective study evaluates the clinical performance of an ORMOCER restorative material (Definite; Degussa) in combination with a self-conditioning adhesive (Etch & Prime 3.0; Degussa).


METHODS
Three hundred fifty-six restorations (48 Class I, 150 Class II, 63 Class III, 32 Class IV, and 63 Class V) in 117 patients (17 to 65 years) were placed by 5 operators at 5 centers. Fillings were placed with cotton roll isolation using clear matrix bands for Classes III and IV and metal matrix bands for Class II restorations. Follow-ups took place after 6, 12, and 24 months whereby modified Ryge criteria were recorded. With 33 randomly selected Class I and II restorations, measurements of occlusal wear (3-dimensional laser scanner) and marginal analyses (scanning electron microscope) were done using replicas.


RESULTS
At 24 months, 307 restorations were available for evaluation. The cumulative number of losses in the 5 cavity classes (I, II, III, IV, and V) and the percentages of scores for the clinical parameters in the 4 categories (Alfa, Beta, Charlie, and Delta) of the retained restorations were loss (1/ 6/ -/ 2/ 7), marginal integrity (93.1/ 6.9/-/-), marginal discoloration (73.5/ 25.5/ 1/ -), anatomic form (82.8/17.2/-/-), and fracture (93.1/ 6.9/-/ -). Marginal analysis showed 48.7% "continuous margin" initially and 13.2% at 24 months (difference statistically significant, a = 0.05). Occlusal wear at 24 months was 12.3 Microm for premolars and 21.4 Microm for molars.


CONCLUSIONS
The overall clinical performance of the ORMOCER restorative over 24 months was acceptable with concerns related to marginal quality and to retention of Class V restorations.
Rosin
Michael
M
Department of Restorative Dentistry, Periodontology and Pediatric Dentistry, University of Greifswald, Germany. rosin@uni-greifswald.de <rosin@uni-greifswald.de>
Schwahn
Christian
C
Kordass
Bernd
B
Konschake
Corinna
C
Greese
Uwe
U
Teichmann
Dirk
D
Hartmann
Axel
A
Meyer
Georg
G
D000293:Adolescent; D000328:Adult; D000368:Aged; D002516:Ceramics / Q000737:chemistry*; D018772:Dental Marginal Adaptation; D003764:Dental Materials / Q000737:chemistry*; D017268:Dental Prosthesis Retention / Q000706:statistics & numerical data*; D019232:Dental Restoration Failure; D019554:Dental Restoration Wear / Q000706:statistics & numerical data*; D006801:Humans; D007834:Lasers; D008875:Middle Aged; D063225:Organically Modified Ceramics; D011446:Prospective Studies; D012821:Silanes / Q000737:chemistry*; D018709:Statistics, Nonparametric
D003764:Dental Materials; D063225:Organically Modified Ceramics; D012821:Silanes