Marginal sealing of relocated cervical margins of mesio-occluso-distal overlays

Abstract

Abstract:We investigated the effect of cervical marginal relocation (CMR) on marginal sealing with two different viscosity resin composites, before adhesive cementation of composite computer-aided design/ computer-assisted manufacture mesio-occluso-distal (MOD) overlays. Standardized MOD cavities prepared in 39 human molars were randomly assigned to three groups. The proximal margins on the mesial side were located 1 mm below the cementoenamel junction. On the distal side of the tooth, the margins were located 1 mm above the cementoenamel junction. In Groups 1 and 2, mesial proximal boxes were elevated with a hybrid composite (GC Essentia MD) and a flowable composite (GC G-aenial Universal Flo), respectively. CMR was not performed in Group 3. The overlays were adhesively cemented, and interfacial leakage was quantified by scoring the depth of silver nitrate penetration along the adhesive interfaces. Leakage score at the dentin-CMR composite interface did not significantly differ between the two tested composites but was significantly lower for Group 3. In all groups, scores were significantly higher at the dentin interface than at the enamel interface. These results indicate that the performance of flowable and microhybrid resin composites, as indicated by marginal sealing ability, is comparable for CMR.

No correlation between two methodological approaches applied to evaluate cervical margin relocation

“…Also, when marginal leakage was assessed regardless of the materials employed, the same results emerged: median score was 5 at CRM sites and median score was 2 for non-CMR sites (Table 3). These findings are in accordance with a previous investigation 17) that compared marginal leakage at the gingival margin in teeth with and without CMR performed prior to cementation of the CAD/CAM overlays. Currently there are no other studies that used the microleakage test to assess the sealing ability at the CMR gingival margin our results could be compared to.…”

“…Moreover, both flowable as well as traditional packable restorative composites could be selected for CMR technique, according to the published clinical reports [5][6][7][8] . A recent study that examined the performance of a flowable and a conventional packable composite reported no significant difference between two different viscosity composites, in terms of microleakage 17) . Hence, for the present research two highly filled flowable composites were selected (Group 1: Premise flowable, 2: Tetric EvoFlow ® Bulk Fill) as particularly recommended for CMR, due to their consistency and ease of use 6,8) .…”

“…The majority of studies used scanning electron microscopy (SEM) to observe the margins and to assess the presence of gaps and irregularities [9][10][11][12][13][14][15] . Couple of other studies tested the microtensile bond strength of the restoration to the floor of the proximal cavity 16) or the sealing ability of the subgingival proximal margin by performing the microleakage test 17) . The abovementioned studies aimed to compare the performance of teeth with and without cervically relocated gingival margins or teeth where CMR was done with different adhesives and composites, applied in one or more layers, and inconsistent and inconclusive results have been reported.…”

Influence of the adhesive strategy in the sealing ability of resin composite inlays after deep margin elevation

“…Up to the present time, there are limited studies evaluating the advantages and limitations of DME technique, and most of them are in vitro and focused on marginal adaptation of indirect restorations (8-10,15-18) fracture resistance (10,17) and bond strength (19). Only two studies have evaluated the sealing ability with microleakage tests, reporting a negative effect of DME technique regardless adhesive strategy (18) and resin composite consistency (20). However, currently, there are no available studies that used the nanoleakage test to assess the sealing ability of interfaces and to identify the pattern for interface degradation after DME elevation technique using different adhesive strategies.…”

Assessment of knowledge, attitude, and practice regarding Deep Margin Elevation (DME) among dental practitioners in Riyadh, Saudi Arabia

“…[ 10 ] It is similar to the idea of the conventional open sandwich technique as the main purpose of both procedures is to facilitate placing the restoration in subgingival cavities by elevating the cervical margin coronally. [ 11 ]…”