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. CLINICAL IMPLICATIONS: 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.
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. CLINICAL IMPLICATIONS: 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.
Authors: Ivana Nedeljkovic; Jan De Munck; Anouk Vanloy; Dominique Declerck; Paul Lambrechts; Marleen Peumans; Wim Teughels; Bart Van Meerbeek; Kirsten L Van Landuyt Journal: Clin Oral Investig Date: 2019-05-23 Impact factor: 3.573
Authors: Marcelle M Nascimento; Valeria V Gordan; Vibeke Qvist; James D Bader; D Brad Rindal; O Dale Williams; Daniel Gewartowski; Jeffrey L Fellows; Mark S Litaker; Gregg H Gilbert Journal: J Am Dent Assoc Date: 2011-12 Impact factor: 3.634
Authors: Kirsten L Van Landuyt; Jan De Munck; R Banu Ermis; Marleen Peumans; Bart Van Meerbeek Journal: Clin Oral Investig Date: 2013-08-15 Impact factor: 3.573
Authors: André Barkhordarian; Reem Ajaj; Manisha H Ramchandani; Gary Demerjian; Riana Cayabyab; Sohrab Danaie; Nora Ghodousi; Natasha Iyer; Nicole Mahanian; Linda Phi; Amy Giroux; Ercolano Manfrini; Negoita Neagos; Muniza Siddiqui; Olivia S Cajulis; Xenia M C Brant; Paul Shapshak; Francesco Chiappelli Journal: Patholog Res Int Date: 2011-05-21
Authors: Marcelle M Nascimento; Deborah A Dilbone; Patricia Nr Pereira; Wagner R Duarte; Saulo Geraldeli; Alex J Delgado Journal: Clin Cosmet Investig Dent Date: 2016-05-03