Tridimensional Evaluation of the Interfacial Gap in Deep Cervical Margin Restorations: A Micro-CT Study

Scotti, Nicola; Baldi, Andrea; Vergano, Edoardo Alberto; Tempesta, Riccardo Michelotto; Alovisi, Mario; Pasqualini, Damiano; Carpegna, Giorgia; Comba, Allegra

doi:10.2341/19-161-l

Cited by 25 publications

(38 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A recent technique to detect interfacial gaps is represented by μCT, which allows, without destroying the specimen, to generate 3D images. The number of studies using μCT in restorative dentistry is increasing, as this technique has proved effective for the evaluation of internal adaptation of composite resin restoration [27][28][29][30][31][32]. In the present study, cyclic intermittent loading induced an interfacial gap opening in all specimens, corroborating in vivo and in vitro previous findings that showed functional and parafunctional stresses, especially transversal forces, are able to cause marginal gap opening on adhesive interfaces [17,18].…”

Section: Discussionsupporting

confidence: 88%

Could different direct restoration techniques affect interfacial gap and fracture resistance of endodontically treated anterior teeth?

et al. 2021

View full text Add to dashboard Cite

Objectives To evaluate different direct restoration techniques on various cavity designs in anterior endodontically treated teeth (ETT). Materials and methods Ninety upper central incisors (n = 90) were selected, endodontically treated, and divided into three groups (n = 30) accordingly to the cavity design: minimal endodontic cavity access (group A), endodontic access + mesial class III cavity (group B), and endodontic access + two class III cavities (group C). Three subgroups (n = 10) were then created accordingly to the restoration technique: nano hybrid composite restoration (subgroup a), glass fiber post + dual-cure luting cement (subgroup b), and bundled glass fiber + dual-cure luting cement (subgroup c). Samples underwent micro-CT scan, chewing simulation, and a second micro-CT scan. 3D quantification (mm3) of interfacial gap progression was performed; then, samples underwent fracture resistance test. Data were statistically analyzed setting significance at p < 0.05. Results Groups A and B showed significantly lower interfacial gap progression compared with group C. Subgroup b performed significantly better compared with subgroups a and c. Improved fracture strength was reported for group C compared with group A, while both subgroups b and c performed better than subgroup a. Conclusions Cavity design significantly influenced interfacial gap progression and fracture resistance. Fiber posts significantly lowered gap progression and improved fracture resistance while bundled fibers only increased fracture resistance. A significant reduction of non-repairable fractures was recorded when fibers were applied. Clinical relevance A minimally invasive approach, conserving marginal crests, should be applied whenever possible. Inserting a fiber post is indicated when restoring anterior ETT, in order to reduce gap progression, improve fracture resistance, and avoid catastrophic failures.

show abstract

Section: Discussionsupporting

confidence: 88%

Could different direct restoration techniques affect interfacial gap and fracture resistance of endodontically treated anterior teeth?

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Micro‐computed tomography (micro‐CT), a method that is frequently used in dental research, can visualize the internal structures non‐destructively with 3D images and is able to perform not only linear but also volumetric measurements of gap between or within objects 20,21 . Micro‐CT approach allows for a quantitative three dimensional imaging and a precise volumetric evaluation of gap measurements in a very high resolution 22 . This contemporary innovative modality can be a beneficial tool to evaluate the denture base adaptation.…”

mentioning

confidence: 99%

Evaluation of Denture Base Adaptation Fabricated Using Conventional, Subtractive, and Additive Technologies: A Volumetric Micro‐Computed Tomography Analysis

Oğuz

Kılıçarslan

Özcan

et al. 2021

Journal of Prosthodontics

View full text Add to dashboard Cite

Purpose An in vitro study to compare the adaptation of denture bases fabricated with 4 different techniques using volumetric 3‐dimentional (3D) analysis. Material and Methods Edentulous maxillary and mandibular casts were scanned, and standardized denture bases were designed using CAD design software. The same standard tessellation language (STL) data were used to produce the denture bases with 4 different fabrication methods: compression molding (CM), injection molding (IM), PMMA milling (PM), and 3D printing (3D) (n = 11/group). Milled wax denture bases were used to fabricate CM and IM groups. Denture bases placed on edentulous casts were scanned using micro‐computed tomography (micro‐CT). Volumetric gap between denture base and cast was calculated from 6 locations for maxilla (anterior ridge crest, posterior ridge crest, labial vestibule, buccal vestibule, palate, and posterior palatal seal) and 3 locations for mandible (intermolar, molar, and retromolar) in addition to overall gap measurements for edentulous arches. The data were analyzed with factorial analysis of variance (ANOVA), 1‐way ANOVA, and post‐hoc Duncan tests. Reproducibility of fabrication methods with regard to each location was assessed using Z test (α = 0.05). Results In the maxilla, the highest and lowest palatal gap measurements were recorded for CM (898.44 ± 87.73 mm3) and PM (357.16 ± 57.68 mm3) (p = 0.05). The highest gap measurements for CM and 3D were at palate and, for IM and PM were at posterior ridge crest. In mandible, the volumetric gap measurements for CM were the highest and for PM were the lowest irrespective of location (p = 0.05). PM group showed the best reproducibility and adaptation with the lowest overall mean gaps for both edentulous arches (p = 0.05). Conclusions Denture bases milled from PMMA blocks showed better adaptation than 3D printed, or wax milled and conventionally fabricated denture bases for both maxillary and mandibular arches. PMMA milling is a reproducible technique that enables the construction of accurate dentures. Clinicians should be cautious about the palatal gap when the compression molding technique is used. Micro‐CT is a valid technique for evaluating the denture base adaptation.

show abstract

“…Only a few authors have used micro-CT to investigate topics such as biomechanics of different veneer preparation designs [54], cement thickness and stress distribution in ceramic crowns [55], and cement layer around root canal posts [56][57][58]. Interfacial gap has been studied using micro-CT in regard to class II cavities [59] and in a few studies regarding marginal gap and cement layer specifically around veneers [60][61][62]. The micro-CT method is easy to use and gives a good insight into material structure, behavior, and precision, as well as defects.…”

Section: Discussionmentioning

confidence: 99%

Resin Cement Residue Removal Techniques: In Vitro Analysis of Marginal Defects and Discoloration Intensity Using Micro-CT and Stereomicroscopy

et al. 2022

View full text Add to dashboard Cite

The objective was to compare marginal defects and evaluate discoloration for adhesively cemented veneers in vitro when using two cement removal techniques. Twenty premolars were prepared with chamfer and borders in enamel. IPS e.max CAD veneers were cemented using Panavia V5 and divided in two groups (n = 10): cement excess removed with a probe after tack-curing for 3–5 s, or cement excess removed with a brush, then completely polymerized. All teeth were stored in alginate gel until micro-CT examination. Scanning was performed twice: directly after cementation and after thermocycling (5000 cycles, between 5 and 55 °C). To analyze discoloration, teeth were colored using 0.5% basic fuchsine and examined under a stereomicroscope. Depth of dye infiltration was scored 0 (no discoloration) to 5 (discoloration along the entire margin). Statistically significant differences of cement defects before thermocycling were reported, where brushing showed more defects than probing (p = 0.0161). After thermocycling, the defects increased for both groups. Extensive discoloration was the most common (55.56%) when removing excess by probing; by brushing, 90% of the specimens exhibited slight discoloration (p = 0.008). Regression analysis showed no relationship between type of defect and degree of discoloration. Removing cement with a brush causes more marginal defects, however less discoloration after thermocycling.

show abstract

Tridimensional Evaluation of the Interfacial Gap in Deep Cervical Margin Restorations: A Micro-CT Study

Abstract: Clinical Relevance Using a material that optimizes marginal seal when using a margin elevation technique to manage deep class II cavities should enhance clinical outcomes.

Cited by 25 publications

References 37 publications

Could different direct restoration techniques affect interfacial gap and fracture resistance of endodontically treated anterior teeth?

Could different direct restoration techniques affect interfacial gap and fracture resistance of endodontically treated anterior teeth?

Evaluation of Denture Base Adaptation Fabricated Using Conventional, Subtractive, and Additive Technologies: A Volumetric Micro‐Computed Tomography Analysis

Resin Cement Residue Removal Techniques: In Vitro Analysis of Marginal Defects and Discoloration Intensity Using Micro-CT and Stereomicroscopy

Contact Info

Product

Resources

About