posterior palatal seal

STATEMENT OF PROBLEM: How different methods of recording posterior palatal seal affect removable complete-denture retention and oral health quality of life is unclear. PURPOSE: The purpose of this clinical study was to compare the retention and oral health quality of life (OHIP-14) between conventional and arbitrary posterior palatal seal techniques in participants with removable complete dentures. MATERIAL AND METHODS: Edentulous patients were recruited according to definitive criteria...

STATEMENT OF PROBLEM: When fabricating a removable dental prosthesis, it is unclear if the information received by the dental laboratory technician is clear and sufficient. PURPOSE: The purpose of this survey study was to evaluate the dentist's work authorizations for removable prostheses as well as determine common practices used by laboratories during the fabrication of removable prostheses. MATERIAL AND METHODS: A 24-item questionnaire was developed based on previously published questionnaires and incorporating new topics...

AIM: The aim of this study was to compare the adaptation of complete denture base (CDB) manufactured by three different techniques: conventional, milling, and three-dimensional (3-D) printing. MATERIALS AND METHODS: A master cast was duplicated to create 60 gypsum casts. Twenty casts ( n = 20) were attributed to each group. In the computer-aided design and computer-aided manufacturing (CAD/CAM) groups (milling and 3-D printing), the 40 gypsum casts reserved for these two groups were scanned...

STATEMENT OF PROBLEM: Reports on digital complete dentures (CDs) are increasing. However, systematic reviews on their accuracy and influencing factors are lacking. PURPOSE: The purpose of this systematic review was to evaluate the accuracy of digital CDs and to summarize influencing factors. MATERIAL AND METHODS: An electronic search of the English language literature from January 2009 to October 2019 was performed in the database PubMed/MEDLINE, with the results enriched by manual searches and citation mining...

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INTRODUCTION: The aim of this 2-arm parallel trial was to compare the dentoskeletal effects of the expander with differential opening (EDO) and the Hyrax expander in the mixed dentition. METHODS: Patients aged 7-11 years with maxillary dental arch constriction and Class I or Class II sagittal relationships were randomly allocated into 2 study groups. The experimental group comprised 22 patients (10 males, 12 females) with a mean age of 8.46 years treated with the EDO...

STATEMENT OF PROBLEM: Studies assessing the comparative denture base adaptation performance of the pour technique for various palatal vault depths are sparse. PURPOSE: The purpose of this in vitro study was to investigate the denture base adaptation performance of the pour technique compared with other conventional fabrication techniques (light-polymerization, injection, compression molding) for shallow and deep palatal vault depths. MATERIAL AND METHODS: Edentulous maxillary study models with 2 palatal vault depths were prepared...

STATEMENT OF PROBLEM: The effect of different build angles on the tissue surface adaptation of complete denture bases manufactured by digital light processing (DLP) is unclear. PURPOSE: The purpose of this in vitro study was to evaluate the effect of build angle on the tissue surface adaptation of DLP-printed complete denture bases. MATERIAL AND METHODS: Both maxillary and mandibular denture bases were virtually designed based on reference casts and fabricated by the DLP technique...

Background: Polymerization shrinkage and fracture are the two common trouble shoots with denture base resins. Polymerization shrinkage affects the dimensional accuracy and fit of the prosthesis. The effect of zirconia (ZrO2 ) nanoparticles on polymerization shrinkage is not documented yet. Purpose: The aim and objective of this study were to evaluate the impact strength and dimensional accuracy of heat-cured poly methyl methacrylate (PMMA) on reinforcement with ZrO2 nanoparticles...

STATEMENT OF PROBLEM: Complete dentures fabricated by computer-aided design and computer-aided manufacturing (CAD-CAM) techniques have become popular. The 2 principal CAD-CAM techniques, milling and rapid prototyping (3D printing), used in the fabrication of complete dentures have been reported to yield clinically acceptable results. However, clinical trials or in vitro studies that evaluated the accuracy of the 2 manufacturing techniques are lacking. PURPOSE: The purpose of this in vitro study was to compare the differences in trueness between the CAD-CAM milled and 3D-printed complete dentures...

STATEMENT OF PROBLEM: Simplified edentulous jaw impression techniques have gained popularity, while their validity has not yet been evaluated. PURPOSE: The purpose of this clinical study was to compare the trueness of maxillary edentulous jaw impressions made with irreversible hydrocolloid (ALG), polyvinyl siloxane (PVS), PVS modified with zinc oxide eugenol (ZOE) (PVSM), and an intraoral scanner (TRI) with a conventionally border-molded ZOE impression (control)...

INTRODUCTION: Maxillary transverse deficiency (MTD) is a common facial disharmony that may need surgical assisted rapid palatal expansion (SARPE). The aim of this study was to present our SARPE technique and to report about our experience. MATERIEL AND METHOD: Medical records of all class III patients who underwent SARPE in our department from 2010 to 2015 and for whom a follow-up of at least 1year was available, were included in a retrospective study. The technique consisted, after short orthodontic preparation allowing for divergence of the upper central incisors, in a complete Le Fort I osteotomy without down fracture, and medial sagittal submucosal separation of the hard palate under general anesthesia in an inpatient procedure...

STATEMENT OF PROBLEM: Although computer-aided design and computer-aided manufacturing (CAD-CAM) complete removable dental prostheses (CRDPs) have gained popularity, conventional impressions are still common for CAD-CAM CRDP treatment. These need to be digitized and converted into virtual edentulous casts with a laboratory impression scan protocol during prosthesis fabrication. How this can best be accomplished is unclear. PURPOSE: The purpose of this in vitro study was to compare the accuracy and reproducibility of virtual edentulous casts created by a dental laboratory laser scanner and a cone beam computed tomography (CBCT) scanner with a digitized master cast...

OBJECTIVE: To compare mechanical performance and enamel-crack propensity of direct, semi-direct, and CAD/CAM approaches for large MOD composite-resin restorations. METHODS: 45 extracted maxillary molars underwent standardized slot-type preparation (5-mm depth and bucco-palatal width) including immediate dentin sealing (Optibond FL) for the inlays (30 teeth). Short-fiber reinforced composite-resin (EverX Posterior covered by Gradia Direct Posterior) was used for the direct approach, Gradia Direct Posterior for the semi-direct, and Cerasmart composite resin blocks for CAD/CAM inlays...

The purpose of this article was to present an alternative procedure using resin-based provisional material to create the posterior palatal seal (PPS). This method offers more practicality in clinical routine and increased control for addition of material to create the PPS when compared to traditional techniques such as the use of impression wax.

The palatine aponeurosis is a thin, fibrous lamella comprising the extended tendons of the tensor veli palatini muscles, attached to the posterior border and inferior surface of the palatine bone. In dentistry, the relationship between the "vibrating line" and the border of the hard and soft palate has long been discussed. However, to our knowledge, there has been no discussion of the relationship between the palatine aponeurosis and the vibrating line(s). Twenty sides from ten fresh frozen White cadaveric heads (seven males and three females) whose mean age at death was 79 years) were used in this study...

OBJECTIVES: The purpose of this "two-arm parallel" trial was to compare the orthopedic, dental, and alveolar bone plate changes of slow (SME) and rapid (RME) maxillary expansions in patients with complete bilateral cleft lip and palate (BCLP). MATERIAL AND METHODS: Forty-six patients with BCLP and maxillary arch constriction in the late mixed dentition were randomly and equally allocated into two groups. Computer-generated randomization was used. Allocation was concealed with sequentially, numbered, sealed, opaque envelopes...

Pre-prosthetic surgery helps to overcome the challenge of prosthetic rehabilitation of the patient including restoration of the best masticatory function possible, combined with restoration or improvement of dental and facial esthetics. Maxillary denture prosthesis fabrication should include thorough examination of the soft palate and palatoglossal arch anatomy. This case report emphasizes on high palatoglossal arch as a rare and new cause of loss of posterior palatal seal and thereby retention of maxillary denture with rational, treated by pre-prosthetic surgery, ever reported in literature...

CONTEXT: The spatial relationship of posterior palatal seal (PPS) width and vibrating lines varies among individuals. Such variability could be related to contour of the palate. AIMS: The study was carried out to evaluate the relationship between PPS width of the patient intra-orally and cephalometric tracing of the same patient. Second part of the study was formulated to determine whether the anterior and posterior vibrating lines can be distinguished as two separate lines by different observers...

STATEMENT OF PROBLEM: Currently no data comparing the denture base adaptation of CAD-CAM and conventional denture processing techniques have been reported. PURPOSE: The purpose of this in vitro study was to compare the denture base adaptation of pack and press, pour, injection, and CAD-CAM techniques for fabricating dentures to determine which process produces the most accurate and reproducible adaptation. MATERIAL AND METHODS: A definitive cast was duplicated to create 40 gypsum casts that were laser scanned before any fabrication procedures were initiated...