Marco Carvalho

University of North Carolina at Chapel Hill | UNC · Department of Operative Dentistry

Objective This study proposes an updated method for the film thickness of 21 resin composites used as cements. Materials and Methods A load of 30 N was subjected to two glass plates stacked on a heated base to simulate clinically relevant pressure and temperature during the seating of inlays/onlays/veneers. The axial position of the actuator was r...

This study aimed to evaluate the influence of material and crown design on the biomechanical behavior of implant-supported crowns with hybrid abutment (HA) through three-dimensional (3D) finite element analysis. The study factors were the type of material used as the mesostructure or crown (zirconia, lithium disilicate, and hybrid ceramic) and the...

The purpose of this study was to analyze the influence of Chitosan 0.2% in various final cleaning methods on the bond strength of fiberglass post (FP) to intrarradicular dentin. Ninety bovine incisors were sectioned to obtain root remnants measuring 18 mm in length. The roots were divided: G1: EDTA 17%; G2: EDTA 17% + PUI; G3: EDTA 17% + EA; G4: ED...

The purpose of this study was to analyze the influence of Chitosan 0.2% in various final cleaning methods on the bond strength of fiberglass post (FP) to intrarradicular dentin. Ninety bovine incisors were sectioned to obtain root remnants measuring 18 mm in length. The roots were divided: G1: EDTA 17%; G2: EDTA 17% + PUI; G3: EDTA 17% + EA; G4: ED...

Purpose: The objective of this study was to determine the influence of different preparation designs on the fracture strength, failure type, repairability, formation of polymerization-induced cracks, and tooth deformation of structurally compromised molars restored with lithium disilicate inlays and overlays in combination with Immediate Dentin Se...

Background To analyze through finite element analysis the stress distribution in peri-implant bone tissues, implants, and prosthetic components induced by the socket shield (SS) technique in comparison to other techniques used to treat tooth loss. Materials and Methods A three-dimensional model of a superior central incisor crown supported by impl...

Resin cements are traditionally used to lute ceramic laminate veneers due to their lower viscosity, which facilitates a fast restoration seating. However, resin cements have lower mechanical properties compared to restorative composite resins. Thus, restorative composite resin is an alternative luting agent with lower marginal degradation as a pote...

Objective: The aim of this study is to assess the shrinkage-induced cuspal deformation and strength of large MOD restorations using three different short fiber-reinforced composite resins (SFRC). Materials and methods: Twenty-seven typodont teeth #30 (Columbia) received a standardized slot-type preparation (5-mm by 5-mm depth and bucco-palatal w...

Purpose: To evaluate the influence of the thickness and type of computer-aided design and computer-aided manufacturing (CAD-CAM) material on the fatigue resistance and failure mode of endodontically treated teeth (ETT) restored with occlusal veneers (OV). Materials and methods: Seventy-five (N = 75) ETT were restored with Herculite XRV in the en...

Statement of problem Information on the survival and mode of failure of endodontically treated incisors without a ferrule and restored without dowels is lacking. Purpose The purpose of this in vitro study was to compare the survival and failure mode of endodontically treated incisors without a ferrule and restored with bonded ceramic crowns and va...

O programa de monitoria busca despertar no acadêmico o interesse pela carreira docente e ampliar o conhecimento crítico/científico dos monitores. O objetivo deste trabalho é relatar a experiência nas atividades de monitoria acadêmica voluntária realizada na disciplina de Prótese Dentária II do curso de Odontologia da Universidade Evangélica de Goia...

Purpose: The present study aimed to investigate the resistance and failure mode of broken-down endodontically treated incisors without ferrule restored with CAD/CAM endocrowns. Materials and methods: Endodontically treated bovine incisors (N = 30) without ferrule were divided into two groups and restored with two types of CAD/CAM endocrowns: lit...

O presente relato de caso objetiva apresentar e discutir o trata- mento estético de um sorriso com laminados em cerâmica felds-pática colados em preparos guiados pelo ensaio restaurador pela técnica da resina termomodificada sob controle de umidade com isolamento absoluto. Após avaliação clínica, fotográfica e com modelos, planejou-se o aprimoramen...

Background and objectives : Differences in dental maturation may affect the prognosis and clinical management of traumatized teeth. However, evaluation of the outcomes of dental trauma to the tooth and support structures in an in vivo model involves major methodological and ethical implications. Thus, the aim of the present study was to perform a t...

The objective of this study was to compare the biomechanical behavior of peri-implant bone tissue and prosthetic components in two modalities of treatment for posterior region of the maxilla, using short implants or standard-length implants associated with bone graft in the maxillary sinus. Four 3D models of a crown supported by an implant fixed in...

Background Immediate dentin sealing implies applying an adhesive system to dentin directly after tooth preparation, before impression. The technique is universal (inlays, onlays, veneers, crowns) and well documented clinically and experimentally. Different types of dentin bonding agents (DBAs) are available on the market. Major differences lie in t...

Objective This study investigated viscosity and thermal kinetics of 10 selected preheated restorative resin composites and the effect of ultrasound energy on film thickness. Methods A range of different resin composites was tested: Charisma Diamond, IPS Empress Direct, Enamel Plus HRi, Essentia, Estelite Omega, Filtek Z100, Filtek Z350 XT, Gradia,...

Aim: This study aimed the description of a protocol to acquire a 3D finite element (FE) model of a human maxillary central incisor tooth restored with ceramic crowns with enhanced geometric detail through an easy-to-use and low-cost concept and validate it through finite element analysis (FEA). Methods: A human maxillary central incisor was digital...

Objetivo: Este trabalho tem como objetivo apresentar um caso clínico de reabilitação estética anterior (centrais e laterais anterossuperiores) associando facetas e coroas cerâmicas cimentadas com diferentes técnicas (cimento resinoso e resina composta aquecida) com a finalidade de reproduzir as características dos dentes naturais. Material e Método...

The absence of four upper incisors is a complex and delicate treatment challenge. The fewer implants are placed into the arch is easier to restore esthetically. However biomechanical principles could be jeopardized. This study evaluated the biomechanical behavior on a fixed prosthesis supported by different number and position implants in the anter...

The absence of four upper incisors is a complex and delicate treatment challenge. The fewer implants are placed into the arch is easier to restore esthetically. However biomechanical principles could be jeopardized. This study evaluated the biomechanical behavior on a fixed prosthesis supported by different number and position implants in the anter...

This clinical case was aimed at reporting and discussing diagnostic methods for early detection and preventive treatment of proximal carious lesions. The patient presented to the dental clinic seeking treatment of a problem she reported as being “dental caries”. The patient’s orthodontist diagnosed dental caries, by means of radiographic exam. Ther...

Adhesive procedures have changed the way to restore endodontically treated teeth (ETT). It started with the shift from cast post-and-core to fiber post. The original focus on strength also shifted towards failure modes, revealing that catastrophic failures are still a concern when restoring endodontically-treated teeth even with fiber posts. As an...

Purpose: To evaluate in vitro the vertical seating of computer-assisted design/computer-assisted manufacturing (CAD/CAM) composite resin inlays, onlays, and overlays luted with two different composite resins. Materials and methods: Sixty plastic typodont molars were prepared for medium-sized MOD inlays, anatomic onlays, and flat overlays (n = 20...

This case report describes the immediate dentin sealing (IDS) technique with self-etch dentin bonding agent (DBA) for indirect restorations. To avoid problems related to dentin exposure when preparing teeth for indirect restorations, the sealing of the dentin immediately after preparation and before impression has been recommended. The IDS techniqu...

Objective: The aim of this study was to investigate the influence of the luting agent on the application of laminate veneers (LVs) in an accelerated fatigue and load-to-failure test after thermo-cyclic aging. Methods: Sound maxillary central incisors (N=40) were randomly divided into four groups to receive LVs (Li2Si2O5) that were adhesively bon...

Statement of problem: Which post-and-core combination will best improve the performance of extensively damaged endodontically treated incisors without a ferrule is still unclear. Purpose: The purpose of this in vitro study was to investigate the restoration of extensively damaged endodontically treated incisors without a ferrule using glass-cera...

Objectives: The aim of this study was to investigate the restoration of broken-down endodontically treated incisors with the ferrule effect using glass ceramic crowns bonded to composite resin core buildups with or without a fiber post. A no-ferrule group with post was also included for comparison. Methods and materials: Thirty decoronated endod...

PURPOSE: The aim of this study was to evaluate the influence of implant macrodesign when using different types of collar and thread designs on stress/strain distributions in a maxillary bone site. MATERIALS AND METHODS: Six groups were obtained from the combination of two collar designs (smooth and microthread) and three thread shapes (square, tra...

Purpose: Dental implant macrogeometry parameters, such as the prosthetic connection and implant body shape, can influence the biomechanical behavior of the restoration. Using tridimensional finite element analysis (3D-FEA), this study evaluated the biomechanical behavior of two implant macrodesign parameters (prosthetic connection and implant body...

Although various abutment connections and materials have recently been introduced, insufficient data exist regarding the effect of stress distribution on their mechanical performance. The purpose of this study was to investigate the effect of different abutment materials and platform connections on stress distribution in single anterior implant-sup...

Objective: The objective of this study was to evaluate the association between jaw bone subjective classifications and quantitative parameters that assess primary stability of dental implants. Method: 52 patients received 135 dental implants (Titamax TI Cortical – Neodent, Curitiba, PR, Brazil) placed in the posterior and anterior regions of maxi...

Objective: The aim of this study was to evaluate the influence of photoinitiator type and curing light on the Knoop Hardness (KHN), cross-link density (CLD) and yellowing of experimental resins. Method: Three resins were prepared containing BisGMA, UDMA, BisEMA and TEGDMA. The photoinitiators used were camphorquinone (CQ), Phenyl-propanedione (PP...

The aim of this study was to investigate the expression of bone resorption (RANK/RANKL), bone resorption inhibitor (osteoprotererin [OPG]), and bone formation marker (osteocalcin [OC]) in neoplastic and bone-related lesions (BRL). Using immunohistochemistry, their expression was evaluated in ossifying fibroma (OF), fibrous dysplasia (FD), simple bo...