Marginal adaptation of in vitro class ii restorations made out of bulk or conventional composite using single- or multi-layered techniques

Article Article scientifique Article Marginal adaptation of in vitro class ii restorations made out of bulk or conventional composite using single- or multi-layered techniques eng 2023 2023 author Dietschi Didier 22053 CUMD - Clinique de cariologie et d'endodontie (CCAR) author Askari Mustafa 780633 author Rossier Isaline 683694 CUMD - Division de cariologie et d'endodontie - communs (DCAR) author Caseiro Luciana 674125 CUMD - Division de cariologie et d'endodontie - communs (DCAR) author Krejci Ivo 122923 Décanat et administration de la faculté de médecine (ADMED) author Leprince Julian Grégoire 405476 CUMD - Division de cariologie et d'endodontie - communs (DCAR) author Di Bella Enrico author Ardu Stefano 506446 CUMD - Consultation de programmation (CPRO) 6325 10.3390/ma16186325 1996-1944 https://www.mdpi.com/1996-1944/16/18/6325 Testing the influence of various restorative materials (conventional or bulkfill composites) and filling techniques (single- or multi-layered techniques) on the in vitro marginal adaptation of large class II direct composites with supra and sub-gingival margins subjected to thermomechanical loading (TML). Methods: A total of 40 prepared teeth were attributed randomly to five experimental groups. In Group 1, restorations were made of multi-layered high-viscosity conventional composite (Tetric EvoCeram); in Groups 2 and 3, restorations were made of a high viscosity bulkfill composite (Tetric EvoCeram Bulk Fill) applied in one (Group 2) or three layers (Group 3); in Groups 4 and 5, restorations were made of a flowable bulkfill composite (SDR flow) applied in one (Group 4) or two layers (Group 5), covered with a layer of high-viscosity conventional composite (Ceram-X Universal). A single adhesive (OptiBond FL) was used in all groups. All specimens were submitted to a staged TML comprising three phases (2 × 500,000 and 1,000,000 cycles) at 50 N with 3350 thermal cycles (5 to 55 ◦C) every 500,000 cycles. The tooth–restoration interfaces on proximal surfaces were evaluated quantitatively by scanning electron microscopy, before and after each TML phase, hence at three timepoints (T0, T1, T2 and T3). The following segments were considered for evaluation: proximal, vertical enamel margins (assessed individually on both restoration sides), cervical enamel (restoration side above CEJ) and cervical dentin margin (restoration side below the CEJ). Results: TML induced a significant reduction in continuous adaptation at both enamel and dentin margins in all groups, with percentages of continuous margins ranging from 75.2 to 91.8% at T0, and decreasing to values ranging from 21.3 to 73.9% at T3. Both composite systems and layering protocols had a significant influence on marginal adaptation of the restorations, with statistical associations depending on the restoration group and the timepoint considered. Defective margins in enamel were all of a cohesive nature with micro-fractures, while in dentin, interfacial gaps were the main defect observed. Conclusions/Clinical significance: The present results highlighted significant degradation of marginal adaption after long-term in vitro fatigue test using materials even with high-viscosity conventional resin composites, applied with a proper layering approach in medium–large sub-gingival cavities. While no significant differences were observed at the dentin cervical margins, there was a tendency for better adaptation at the enamel margin when using a higher modulus material with a multi-layered technique Bulkfill Marginal adaptation Resin composite Class II Dewey 617.6 205 Division de cariologie et d'endodontie 24P1 false 189 Groupe Krejci Ivo (médecine dentaire) 240 Materials 16 18 e2a44fd6-9eaf-42d9-bcae-a9a62c1748e5 Article (Published version) Public 10519.pdf 8604738 application/pdf CC BY-4.0 1a70b7b118f1c6396011889f68dbf09b5a7669ccb1e276194aef88ff980db494 openAccess Faculté de médecine / Section de médecine dentaire / Département de médecine dentaire préventive et de premier recours / Division de cariologie et d'endodontie

Title	Published in	Year	Views	Downloads

Evaluation in-vitro de l’adaptation marginale de restaurations de classe II réalisées avec des composites « bulk » ou traditionnel en technique mono- ou multi-stratifiée		2024	196	109
Marginal adaptation of in vitro class ii restorations made out of bulk or conventional composite using single- or multi-layered techniques	Materials	2023	100	51

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