title: Sealing of minimally invasive Class II fillings (slot) using an adhesive patch: sealant margin extension for prevention.
abstract: A laboratory study was performed to assess the potential of an adhesive patch to seal small, unbeveled, Class II, box-only (slot) composite fillings. After minimal access cavity preparation with an 80 pm diamond bur, 40 box-only Class II cavities were prepared mesially and distally in 20 extracted human molars using a u-shaped PCS insert (EMS). One cavity per tooth was adhesively filled with a hybrid composite material in one increment. A patch, acting as an adhesive matrice, was applied to the other cavity of each tooth to seal the restoration. The margin of the patch was located in areas easily accessible to oral hygiene measures and self-cleaning. All the teeth were subjected to thermo-mechanical stress in a computer-controlled masticator device. In 10 teeth, caries was induced in a microbial-based artificial mouth model and quantitatively determined by confocal laser scanning microscopy. Microleakage was assessed in the other 10 teeth in two planar sections after immersion in 0.5% basic fuchsin solution. The results showed no demineralization at the filling margins protected with the patch. Microleakage was observed in one sample only and was limited to the enamel. In contrast, the margins of fillings without the patch application showed a mean demineralization depth of 146 +/- 42 microm and dye penetration into the dentin in five sections. This innovative approach to sealing restorative margins with an adhesive patch results in less leakage and filling margin demineralization and merits further investigation.
authors.affiliation: Department of Preventive Dentistry, Periodontology and Cariology, Center for Dental Medicine, University of Zurich, Zürich, Switzerland. patrick.schmidlin@zzmk.uzh.ch
authors.forename: Patrick R
authors.initials: PR
authors.lastname: Schmidlin
authors.forename: Rainer
authors.initials: R
authors.lastname: Seemann
authors.forename: Tilla
authors.initials: T
authors.lastname: Filli
authors.forename: Thomas
authors.initials: T
authors.lastname: Attin
authors.forename: Thomas
authors.initials: T
authors.lastname: Imfeld
mesh_terms: D000134:Acid Etching, Dental; D000269:Adhesives / Q000737:chemistry*; D001732:Bite Force; D004396:Coloring Agents; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003731:Dental Caries / Q000473:pathology; D003737:Dental Cavity Preparation / Q000145:classification; D003743:Dental Enamel / Q000648:ultrastructure; D003763:Dental Leakage / Q000145:classification; D003793:Dental Restoration, Permanent / Q000145:classification*; D003804:Dentin / Q000648:ultrastructure; D006801:Humans; D008422:Materials Testing; D018613:Microscopy, Confocal; D008963:Molar; D019279:Resin Cements / Q000737:chemistry; D012394:Rosaniline Dyes; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D017001:Tooth Demineralization / Q000473:pathology
chemical_list: D000269:Adhesives; D004396:Coloring Agents; D003188:Composite Resins; D019279:Resin Cements; D012394:Rosaniline Dyes; C078484:Syntac dentine adhesive; C090969:Tetric; C025485:basic fuchsin