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Journal of Dentistry

Jaymit Patel, Clare Granger, Sandra Parker, Mangala Patel
OBJECTIVES: This in-vitro study investigated the effect of 'instrument lubricants' used during placement of composite restorative material, on the diametral tensile strength (DTS) and water uptake of composite specimens. METHODS: 300 posterior composite cylindrical specimens were manufactured: 60 with each instrument lubricant (ethanol, 3-step, 2-step and 1-step 'bonding agent') and 60 with no lubricant (controls). Each set of 60 specimens was evenly allocated to one of the following test groups (n=100/group): Group 1 - tested for DTS immediately after manufacture; Groups 2 and 3 - tested for DTS after immersion in phosphate-buffered saline (PBS) for 1 and 12-weeks respectively, using a Universal Instron machine...
October 13, 2016: Journal of Dentistry
Raquel Castillo-Oyagüe, Carmen Perea, María-Jesús Suárez-García, Jaime Del Río, Christopher D Lynch, Arelis Preciado
OBJECTIVES: To validate the 'Quality of Life related to function, aesthetics, socialization, and thoughts about health-behavioural habits (QoLFAST-10)' questionnaire for assessing the whole concept of oral health-related quality of life (OHRQoL) of implant-supported fixed partial denture (FPD) wearers. METHODS: 107 patients were assigned to: Group 1 (HP; n=37): fixed-detachable hybrid prostheses (control); Group 2 (C-PD, n=35): cemented partial dentures; and Group 3 (S-PD, n=35): screwed partial dentures...
October 13, 2016: Journal of Dentistry
Domenico Ricucci, José F Siqueira, Simona Loghin, Louis M Lin
: Descriptions of the pathologic changes in the pulp and associated apical structures of human immature teeth in response to deep caries are lacking in the literature. OBJECTIVES: This article describes the histologic events associated with the radicular pulp and the apical tissues of human immature teeth following pulp inflammation and necrosis. METHODS: Twelve immature teeth with destructive caries lesions were obtained from 8 patients. Two intact immature teeth served as controls...
October 12, 2016: Journal of Dentistry
J E Creeth, S A Kelly, C González-Cabezas, R Karwal, E A Martinez-Mier, R J M Lynch, M L Bosma, D T Zero
OBJECTIVES: The influence of toothbrushing duration and dentifrice quantity on fluoride efficacy against dental caries is poorly understood. This study investigated effects of these two oral hygiene factors on enamel remineralisation (measured as surface microhardness recovery [SMHR]), enamel fluoride uptake (EFU), and net acid resistance (NAR) post-remineralisation in a randomized clinical study using an in situ caries model. METHODS: Subjects (n=63) wore their partial dentures holding partially demineralized human enamel specimens and brushed twice-daily for two weeks, following each of five regimens: brushing for 120 or 45s with 1...
October 4, 2016: Journal of Dentistry
Hee-Kyung Kim, Sung-Hun Kim
OBJECTIVES: The purposes of this study were to evaluate the optical properties of recently marketed pre-colored monolithic zirconia ceramics and to compare with those of veneered zirconia and lithium disilicate glass ceramics. METHODS: Various shades of pre-colored monolithic zirconia, veneered zirconia, and lithium disilicate glass ceramic specimens were tested (17.0×17.0×1.5mm, n=5). CIELab color coordinates were obtained against white, black, and grey backgrounds with a spectrophotometer...
October 4, 2016: Journal of Dentistry
F Kuhr, A Schmidt, P Rehmann, B Wöstmann
OBJECTIVE: To evaluate a new method of measuring the real deviation (trueness) of full arch impressions intraorally and to investigate the trueness of digital full arch impressions in comparison to a conventional impression procedure in clinical use. METHODS: Four metal spheres were fixed with composite using a metal application aid to the lower teeth of 50 test subjects as reference structures. One conventional impression (Impregum Penta Soft) with subsequent type-IV gypsum model casting (CI) and three different digital impressions were performed in the lower jaw of each test person with the following intraoral scanners: Sirona CEREC Omnicam (OC), 3M True Definition (TD), Heraeus Cara TRIOS (cT)...
October 4, 2016: Journal of Dentistry
Chris Ying Cao, Quan-Li Li
OBJECTIVE: To investigate remineralisation of dentine in the hydrogel microenvironment for the management of hypersensitivity. METHODS: Human dentine slices were prepared from extracted sound human molars. They were acid-etched with phosphoric acid and put into the polyethylene tubes. The etched dentine surfaces were covered by a 2-mm-thick layer of CaCl2 agarose hydrogel. Another 2-mm-thick layer of ion-free agarose hydrogel was added on top of the CaCl2 agarose hydrogel...
October 1, 2016: Journal of Dentistry
Haitham Askar, Yu-Kang Tu, Sebastian Paris, Yi-Chun Yeh, Falk Schwendicke
OBJECTIVES: The risk of 'caries adjacent to restorations' (CAR) might depend on the used restorative materials. In situ studies are often used to compare the risk of caries adjacent to different materials. We aimed to review in situ studies to evaluate how different materials contribute to risk of CAR. DATA SOURCES: We included in situ controlled trials comparing directly placed restorative materials, reporting on caries (mineral loss, measured via radiography or micro-hardness) adjacent to these materials...
September 30, 2016: Journal of Dentistry
Mary H M Li, Eduardo Bernabé
OBJECTIVE: To explore the association between tooth wear and quality of life among adults in the United Kingdom, independently of sociodemographic factors and other common oral conditions. METHODS: We used data from 5654 dentate adults who participated in the 2009 Adult Dental Health Survey. Tooth wear was assessed during clinical examination and classified as none, mild, moderate and severe based on the worst affected tooth recorded. The numbers of teeth with mild, moderate and severe tooth wear were used as alternative measures...
September 28, 2016: Journal of Dentistry
Karim Elhennawy, Falk Schwendicke
OBJECTIVES: We systematically reviewed treatment modalities for MIH-affected molars and incisors. DATA: Trials on humans with ≥1 MIH molar/incisor reporting on various treatments were included. Two authors independently searched and extracted records. Sample-size-weighted annual failure rates were estimated where appropriate. The risk of bias was assessed using the Newcastle-Ottawa scale. SOURCES: Electronic databases (PubMed, Embase, Cochrane CENTRAL, Google Scholar) were screened, and hand searches and cross-referencing performed...
September 28, 2016: Journal of Dentistry
Sonia K Makhija, Nathaniel C Lawson, Gregg H Gilbert, Mark S Litaker, Jocelyn A McClelland, David R Louis, Valeria V Gordan, Daniel J Pihlstrom, Cyril Meyerowitz, Rahma Mungia, Michael S McCracken
OBJECTIVES: Dentists enrolled in the National Dental Practice-Based Research Network completed a study questionnaire about techniques and materials used for single-unit crowns and an enrollment questionnaire about dentist/practice characteristics. The objectives were to quantify dentists' material recommendations and test the hypothesis that dentist's and practice's characteristics are significantly associated with these recommendations. METHODS: Surveyed dentists responded to a contextual scenario asking what material they would use for a single-unit crown on an anterior and posterior tooth...
September 28, 2016: Journal of Dentistry
Dominique Niesten, Dick Witter, Ewald Bronkhorst, Nico Creugers
OBJECTIVES: To examine relationships between oral health (OH) factors and general health (GH) factors (including physical, mental, and social health domains), and oral health-related quality of life (OHRQoL) in a care-independent and a care-dependent older population. METHODS: Care-independent participants (n=109) were recruited from the Nijmegen dental school; care-dependent participants (n=126) from residential aged care facilities. Data collected included: OHRQoL (Geriatric Oral Health Assessment Index (GOHAI)), age, gender, socioeconomic status, number of teeth and occluding pairs, presence of carious teeth, presence of removable dental prostheses, clinically assessed treatment need (CTN), self-reported GH, and, only for care-dependent participants: care-dependency level and health domain variables: physical, mental (SF-12: Physical and Mental Component Summary scores), and social (ENRICHD social support index)...
September 20, 2016: Journal of Dentistry
Maria André, Wen Kou, Göran Sjögren, Anders Sundh
OBJECTIVES: To evaluate the effect of specimen thickness, pretreatment and hydrothermal aging on the biaxial flexural strength (BFS) of lithium di-silicate glass (e.max Cad) and magnesia-stabilized zirconia (ZirMagnum) ceramic discs. METHODS: The e.max Cad discs was studied: i) crystallized, ii) crystallized and glazed and iii) crystallized, glazed and unglazed side etched with hydrofluoric acid. The ZirMagnum discs were studied: i) as delivered, ii) after sandblasting and iii) after heat treatment similar to veneering...
September 13, 2016: Journal of Dentistry
Alex Nogueira Haas, Tassiane Panta Wagner, Francisco Wilker Mustafa Gomes Muniz, Tiago Fiorini, Juliano Cavagni, Roger Keller Celeste
OBJECTIVES: To evaluate the efficacy of EO as adjuncts to mechanical plaque control (MPC) on the reduction of plaque and gingivitis when compared to placebo or cetylpyridium chloride (CPC). DATA: Randomized controlled trials of at least 6 months of follow-up including systemically healthy individuals with gingivitis were included. SOURCES: MEDLINE, EMBASE, Lilacs and SCOPUS were searched up to April 2016. From 3045 citations, 16 studies were included...
September 11, 2016: Journal of Dentistry
Vatche Kassardjian, Sachin Varma, Manoharan Andiappan, Nico H J Creugers, David Bartlett
BACKGROUND: Clinical experience suggests that there is a difference in survival between anterior and posterior all ceramic restorations. OBJECTIVES: This systematic review compared the difference in survival for full coverage all-ceramic materials used in adults to restore anterior or posterior vital teeth, not involved with fixed dental prostheses, but opposed by teeth. DATA AND SOURCES: Searches using Medline, Embase, and the Cochrane Library, including hand searches, with the inclusion criteria containing all-ceramic full coverage crowns in human adults over 17 years of age, prospective and retrospective studies, opposed by teeth, periodontal pocketing ≤5mm, but not involving implant supported crowns or non-vital teeth...
September 1, 2016: Journal of Dentistry
Chung-Min Kang, Yeji Sun, Je Seon Song, Nan-Sim Pang, Byoung-Duck Roh, Chan-Young Lee, Yooseok Shin
OBJECTIVES: The aim of this study was to evaluate and compare the clinical applicability of various MTA materials as partial pulpotomy materials in permanent teeth. METHODS: Partial pulpotomy was performed on 104 permanent teeth from 82 people (mean 29.3±14.8years old), who met the inclusion criteria in randomized clinical trial. The teeth were divided into three groups: ProRoot MTA (n=33), OrthoMTA (n=36), RetroMTA (n=35). Clinical examination and radiographic comparison were carried out at 1, 3, 6 and 12 months after the treatment...
July 26, 2016: Journal of Dentistry
René Daher, Albert J Feilzer, Ivo Krejci
OBJECTIVES: To evaluate the biomechanical influence of reconnecting the buccal and lingual walls of endodontically treated lower molar with a large MOD cavity. METHODS: 3D models were created from a micro-CT scan of an extracted intact lower human molar. Finite element analysis was then used to compare the stress distribution and displacement of the structures between different models: Unrestored MOD on ETT (Unrest), MOD on ETT restored with composite resin (Norm), MOD on ETT reinforced with a non-invasive ring (Ring) and intact tooth as the control (Int)...
November 2016: Journal of Dentistry
Vaughan Hoefler, Hiroko Nagaoka, Craig S Miller
OBJECTIVES: A systematic review was performed to compare the long-term survival of deep dentine caries-affected permanent teeth treated with partial-caries-removal (PCR) versus similar teeth treated with stepwise-caries-removal techniques (SWT). DATA: Clinical studies investigating long-term PCR and SWT outcomes in unrestored permanent teeth with deep dentine caries were evaluated. Failures were defined as loss of pulp vitality or restorative failures following treatment...
November 2016: Journal of Dentistry
A M Salem, S J Jones, I R Ellis, R G Chadwick
AIMS: Placement of a restoration to treat root caries disrupts many tissues. There is scope for the restorative material to interact with these to augment reductions in micro leakage afforded by an adhesive restorative material. OBJECTIVES: 1) To investigate the effects of incorporating bioactive molecules into a glass polyalkenoate (GPA) 2) To quantify the changes in physical properties of the material. METHODS: Biocompatibility of the GPA cement (Chemfil Superior, Dentsply De Trey, Konstanz, Germany) in unmodified and modified forms was ascertained using cell culture techniques...
November 2016: Journal of Dentistry
C Ganss, J Marten, A T Hara, N Schlueter
OBJECTIVES: To investigate in vitro a range of differently characterised toothpastes with respect to their efficacy in an erosion/abrasion setting with special emphasis on the role of the particulate ingredients. METHODS: Human enamel samples were erosively demineralised with citric acid (2min, 6×/day; 0.5%, pH 2.5; 10 days) and immersed in slurries (2min, 2×/day) either without or with brushing (15s, load 200g). The toothpastes were eight NaF-toothpastes, three hydroxyapatite-toothpastes (one without and two with NaF), one fluoride-free chitosan-toothpaste and three Sn-toothpastes...
November 2016: Journal of Dentistry
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