The effects of occlusal loading on the margins of cervical restorations.
BACKGROUND
Researchers have proposed the restoration of abfraction lesions, but limited information is available about the effects of occlusal loading on the margins of such restorations. Because abfraction is a well-recognized problem, the authors conducted a study to assess the effects of occlusal loading on the margins of cervical restorations.


METHODS
The authors prepared 40 wedge-shaped cavities in extracted premolars and restored them with a resin-based composite. They subjected specimens to occlusal loading (150 newtons, 10(6) cycles) on the buccal cusp, on the central fossa or on the lingual cusp, and they stored the control group specimens in deionized water. The authors used fluorescein to delimit marginal defects and evaluated the defects by using laser scanning confocal microscopy.


RESULTS
Results of chi2 and Kruskal-Wallis tests (P < .05) showed that specimens subjected to occlusal loading had a higher percentage of marginal gaps (53.3 percent) than did the control specimens (10.0 percent). There were no differences between groups in marginal defect formation or in defect location, length or width.


CONCLUSIONS
Occlusal loading led to a significant increase in gap formation at the margins of cervical resin-based composite restorations.


CONCLUSIONS
The clinician cannot underestimate the effects of occlusal loading when restoring teeth with cervical wedge-shaped lesions. If occlusal loading is the main factor contributing to lesion formation, the clinician should identify and treat it before placing the restoration or otherwise run the risk that the restorative treatment will fail because of marginal gap formation.
Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, São Paulo, Brazil. luff@usp.br
Luciana Fávaro
LF
Francisconi
Márcia Sirlene Zardin
MS
Graeff
Leandro de Moura
Lde M
Martins
Eduardo Batista
EB
Franco
Rafael Francisco Lia
RF
Mondelli
Paulo Afonso Silveira
PA
Francisconi
José Carlos
JC
Pereira
D001641:Bicuspid; D001732:Bite Force; D003188:Composite Resins; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000379:methods; D003799:Dental Stress Analysis; D006801:Humans; D018613:Microscopy, Confocal; D019237:Tooth Cervix / Q000473:pathology; D057085:Tooth Wear / Q000628:therapy*
D003188:Composite Resins; C444701:Filtek Z250