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Journal of Prosthetic Dentistry

Ryan Jin-Young Kim, Ji-Man Park, June-Sung Shim
STATEMENT OF PROBLEM: Different intraoral scanners (IOSs) are available for digital dentistry. However, information on the accuracy of various IOSs for complete-arch digital scans is limited. PURPOSE: The purpose of this in vitro study was to evaluate the trueness and precision of complete-arch digital scans produced by 9 IOSs, using the superimposition method, and to compare them based on characteristics including the data capture principle and mode and the need for powder coating...
July 10, 2018: Journal of Prosthetic Dentistry
George Fokas, Li Ma, Vasilios Chronopoulos, Martin Janda, Nikos Mattheos
STATEMENT OF PROBLEM: Evidence for micromorphology and precision of fit of third-party prosthetic components compared with the original manufacturer's components is lacking. PURPOSE: The purpose of this in vitro pilot study was to evaluate the micromorphological differences among different commercial brands of zirconia, titanium, and gold abutments for dental implants in terms of tight surface contact. MATERIAL AND METHODS: The following abutments (n=3 per type) were preloaded on Straumann Bone Level implants according to the manufacturer's instructions for zirconia (Zr, Zr2, Zr3), titanium (Ti and Ti2), and gold (Gold 1, Gold 2)...
July 10, 2018: Journal of Prosthetic Dentistry
Iman A-W Radi, Wafaa Ibrahim, Sylvia M S Iskandar, Nouran AbdelNabi
STATEMENT OF PROBLEM: Osteoporosis is a risk factor for implant success. Evidence for the prognosis of dental implants in patients with osteoporosis is still unclear. PURPOSE: The purpose of this systematic review was to compare implant success in patients with low versus normal bone density and to evaluate special techniques used to enhance implant success in these patients. MATERIAL AND METHODS: Searches were performed electronically in 4 databases (PubMed, LILACS, Cochrane, and Grey Literature) through July 2017 and manually to identify studies addressing the subject...
July 10, 2018: Journal of Prosthetic Dentistry
Célia Regina Moreira Lanza, José Alcides Almeida de Arruda, Aline Martins Soares, Mariana de Oliveira Santos, Alessandra Figueiredo de Souza, Lincon Dias Lanza, Amália Moreno
The facial masks commercially available for noninvasive positive pressure ventilation therapy for children with clinical conditions of hypoventilation are limited by size and hardness. The present report describes a straightforward method of developing a nasal mask from a room-temperature vulcanizing silicone elastomer for daily contact with the nasal mucosa of babies during noninvasive positive pressure ventilation. The fabrication of the silicone mask with nasal tubes is based on maxillofacial prosthesis techniques, with retention with steel prongs and elastics...
July 10, 2018: Journal of Prosthetic Dentistry
Elena Hotinski, James Dudley
STATEMENT OF PROBLEM: Techniques that allow angulation correction for screw-retained implant-supported restorations are now available. However, whether angulation correction built into the head of the implant affects abutment screw loosening is unclear. PURPOSE: The purpose of this in vitro study was to assess abutment screw loosening in angulation-correcting implants and straight implants subjected to simulated nonaxial occlusal loading. MATERIAL AND METHODS: Seven external connection 12-degree angulation-correcting implants and 7 straight implants were embedded in an acrylic resin housing, and titanium abutments were secured with titanium screws tightened to 32 Ncm...
July 10, 2018: Journal of Prosthetic Dentistry
Amin Davoudi, Mansour Rismanchian
STATEMENT OF PROBLEM: Cement-retained implant-supported prostheses eliminate screw loosening and enhance esthetics. However, retrievability and the possibility of removing extruded excess cement (EEC) have been problematic. PURPOSE: The purpose of this systematic review was to analyze the effects of modifying the screw access channel (SAC) on the amount of EEC and the retention of cement-retained implant-supported prostheses. MATERIAL AND METHODS: PubMed, Web of Science, Scopus, and Google Scholar databases were searched with appropriate key words...
July 10, 2018: Journal of Prosthetic Dentistry
Gunjan S Aswal, Shashi K Mohanram, Chandrasekharan K Nair, Vishwanath Gurumurthy, Renu Rawat
Facial contractures caused by burns can collapse the nasal aperture and lead to airway obstruction. Management in such situations requires surgical and prosthetic intervention. Prosthetically, although a nasal conformer is the treatment of choice, even a well-fabricated nasal conformer may be esthetically unappealing and require an aid for enhanced retention. Expensive implant-aided conformers are not always a viable option. This article introduces a technique for fabricating a nasal conformer that is both esthetically appealing and cost-effective...
July 10, 2018: Journal of Prosthetic Dentistry
Fang Qu, Xue Du, Wei-Cai Liu
An appliance was designed and fabricated by using computer-aided design and computer-aided manufacturing (CAD-CAM) and 3-dimensional (3D) printing to combine a custom tray with an intraoral Gothic arch. This helped simplify centric relation recording and combined definitive impression making and centric relation recording into a single step.
July 10, 2018: Journal of Prosthetic Dentistry
Zaid Ali, Sarah R Baker, Shirin Shahrbaf, Nicolas Martin, Mario V Vettore
STATEMENT OF PROBLEM: Clinicians are currently unable to quantify the psychosocial, functional, and esthetic effects of prosthetic interventions to replace teeth. Understanding the effects of treatment to replace teeth on oral health-related quality of life (OHRQoL) is important for informed consent. A systematic review of the evidence of OHRQoL improvements with prosthodontic tooth replacement and a comparison of outcomes between treatment modalities is therefore indicated. PURPOSE: The purpose of this systematic review was to examine the OHRQoL of patients with partial edentulism after different dental prosthetic treatments...
July 10, 2018: Journal of Prosthetic Dentistry
Marta Revilla-León, Laura Ceballos, Iñaki Martínez-Klemm, Mutlu Özcan
STATEMENT OF PROBLEM: Titanium frameworks for implant-supported prostheses can be additively manufactured using different powder-based fusion technologies, including selective laser melting (SLM) and electron beam melting (EBM). Some manufacturers have developed a technique that combines the printing of the framework with the subsequent machining of the implant interface. Whether these technologies produce frameworks with acceptable accuracies is unclear. PURPOSE: The purpose of this in vitro study was to evaluate the discrepancy obtained from the digitizing procedures of the definitive cast, the implant-prosthesis discrepancy, and the distortion of the manufacturing processes in the fabrication of titanium frameworks for implant-supported complete-arch prostheses manufactured using SLM and EBM additive manufacturing technologies...
July 10, 2018: Journal of Prosthetic Dentistry
Maria G R Pucciarelli, Adolfo C O Lopes, José F S Lopes, Simone Soares
The multidisciplinary teams involved in the treatment of individuals with cleft lip and palate are challenged when implants are indicated in the cleft area. Difficulties include obtaining a healthy peri-implant area and, especially, obtaining the natural-looking papilla essential for esthetic success. The area affected by the cleft has a bone deficiency, which is typically augmented with an alveolar bone graft at adolescence. Guidelines for the 3-dimensional placement of implants at the cleft area are presented based on clinical reports...
July 10, 2018: Journal of Prosthetic Dentistry
Hyun-Ji Hwang, Sang J Lee, Eun-Jin Park, Hyung-In Yoon
STATEMENT OF PROBLEM: Limited information is available evaluating the trueness and tissue surface adaptation of computer-aided design and computer-aided manufacturing (CAD-CAM) maxillary denture bases fabricated using digital light processing (DLP). PURPOSE: The purpose of this in vitro study was to evaluate the trueness of DLP-fabricated denture bases and to compare the tissue surface adaptation of DLP with milling (MIL) and pack and press (PAP). MATERIAL AND METHODS: The maxillary denture bases were virtually designed on the reference cast and were fabricated using DLP and MIL...
July 10, 2018: Journal of Prosthetic Dentistry
Arvind Tripathi, Saumyendra V Singh, Himanshi Aggarwal, Ashutosh Gupta
STATEMENT OF PROBLEM: Although different impression techniques have been advocated for complete denture prosthodontics, objective studies that predict their effect on alveolar bone resorption are lacking. PURPOSE: The purpose of this prospective clinical pilot study was to objectively evaluate the effect of complete dentures fabricated by different impression techniques on mandibular residual ridge resorption in individuals with different bone mineral density. MATERIAL AND METHODS: Ninety-six participants with edentulism, selected according to inclusion criteria, underwent bone mineral density assessment and were divided into normal, osteopenic, and osteoporotic groups...
July 10, 2018: Journal of Prosthetic Dentistry
Jean-Philippe Ré, Jean-Daniel Orthlieb
No abstract text is available yet for this article.
July 10, 2018: Journal of Prosthetic Dentistry
Mohamed H Helal, Hebatullah D Hendawy, Rowan A Gaber, Nourhan R Helal, Moustafa N Aboushelib
STATEMENT OF PROBLEM: Reconstruction of alveolar bony defects is difficult using grafting materials in a powder form. A biodegradable scaffold material might simplify the procedure. PURPOSE: The purpose of this in vivo study was to evaluate osteogenesis ability of a biodegradable CAD-CAM-fabricated polylactic acid (PLA) scaffold enriched with calcium phosphate salts including hydroxyapatite (HA) and beta tricalcium phosphate (β-TCP) used to reconstruct mandibular defects in a dog model...
June 29, 2018: Journal of Prosthetic Dentistry
Victor E de Souza Batista, Fellippo R Verri, Cleidiel A A Lemos, Ronaldo S Cruz, Hiskell F F Oliveira, Jéssica M L Gomes, Eduardo P Pellizzer
STATEMENT OF PROBLEM: The decision to splint or to restore independently generally occurs during the planning stage, when the advantages and disadvantages of each clinical situation are considered based on the proposed treatment. However, clinical evidence to help clinicians make this decision is lacking. PURPOSE: The purpose of this systematic review and meta-analysis was to assess the marginal bone loss, implant survival rate, and prosthetic complications of splinted and nonsplinted implant restorations...
June 29, 2018: Journal of Prosthetic Dentistry
Gustavo Dartora, Pedro Henrique Wentz Tretto, Rodrigo Varella de Carvalho, Atais Bacchi
Discolored substrates constitute a challenge to the esthetics of the definitive restoration. Because of technique sensitivity, the generally prolonged treatment time is a drawback to both the patient and the dentist. The technique described presents the replacement of ceramic maxillary incisors crowns over discolored substrates in a single visit by using a milling machine. Translucent blocks of a lithium silicate ceramic reinforced with zirconium dioxide particles were used. Intraoral scans of the trial restorations and of the tooth preparations were performed...
June 29, 2018: Journal of Prosthetic Dentistry
Ramtin Sadid-Zadeh, Anthony Alexander
This report describes the complete mouth rehabilitation of worn dentition by using a digital workflow on a non-hinge simulated patient. A dentiform was used to simulate a patient with loss of occlusal vertical dimension. Physical diagnostic waxing along with a digital workflow was then used to re-establish the occlusal vertical dimension at the interim and definitive restoration stages.
June 29, 2018: Journal of Prosthetic Dentistry
Mona Gibreel, Lippo V J Lassila, Timo O Närhi, Leila Perea-Lowery, Pekka K Vallittu
STATEMENT OF PROBLEM: Acrylic resin overdenture bases usually fracture because of stress concentrations at the area of the abutments. PURPOSE: The purpose of this study was to evaluate the reinforcing effect of bidirectional woven electrical glass (E-glass) fiber weaves with a different number of layers and different locations on the load-bearing capacity of simulated Locator-retained overdenture specimens. MATERIAL AND METHODS: Test specimens with a centrally located metal housing for a Locator stud attachment were fabricated from autopolymerizing acrylic resin (polymethylmethacrylate based) and reinforced with bidirectional woven E-glass fiber layers...
June 29, 2018: Journal of Prosthetic Dentistry
Eran Dolev, Yoli Bitterman, Avi Meirowitz
STATEMENT OF PROBLEM: Hot-pressing and computer-aided design and computer-aided manufacturing (CAD-CAM) are major techniques for the fabrication of lithium disilicate crowns. They exhibit different accuracies regarding marginal fit, an important factor in restoration survival. However, studies comparing the marginal fit of different fabrication methods are lacking. PURPOSE: The purpose of this in vitro study was to compare the marginal discrepancy (MD) and absolute marginal discrepancy (AMD) of lithium disilicate crowns produced by the hot-press and CAD-CAM techniques...
June 29, 2018: Journal of Prosthetic Dentistry
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