Open Dentistry Journal最新文献

{"title":"Effect of Surface Treatments on Shear Bond Strength of Polyetheretherketone to Autopolymerizing Resin","authors":"Kosuke Kurahashi, Takashi Matsuda, Y. Ishida, T. Ichikawa","doi":"10.3390/dj7030082","DOIUrl":"https://doi.org/10.3390/dj7030082","url":null,"abstract":"These days, new prosthodontic materials are appearing with the development of digitalization. Among these, the use of polyetheretherketone (PEEK) as the clasp of removable partial dentures has been proposed. The adhesive strength between the PEEK and acrylic resin influences the probability of denture fracture. To investigate the effect of PEEK surface treatments on the shear bond strength to acrylic resin, five surface treatment conditions of PEEK were analyzed: 1. no treatment; 2. ceramic primer application; 3. Al2O3 sandblasting; 4. Rocatec; and 5. Rocatec with ceramic primer application, comparing with a metal primer-treated Co-Cr alloy. Two kinds of autopolymerizing resin (Unifast II and Palapress Vario) were used as bonding materials. The specimens were evaluated to determine the bond strength. Rocatec treatment with ceramic primer application yielded the highest bond strengths (12.71 MPa and 15.32 MPa, respectively, for Unifast II and Palapress Vario). When compared to a metal primer-treated Co-Cr alloy, the bond strength of PEEK to Unifast II was similar, whereas it was about 60% of that to Palapress Vario. Rocatec treatment, combined with ceramic primer, showed the highest bond strength of PEEK to acrylic resin. Treatment of PEEK will enable its use as the clasp of removable dentures and the fixation of PEEK prostheses.","PeriodicalId":47284,"journal":{"name":"Open Dentistry Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81618885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reaching Vulnerable Populations through Portable and Mobile Dentistry—Current and Future Opportunities","authors":"Shailee Gupta, Muna Hakim, Dishant Patel, L. Stow, Katherine Shin, Peggy Timothé, R. Nalliah","doi":"10.3390/dj7030075","DOIUrl":"https://doi.org/10.3390/dj7030075","url":null,"abstract":"The Action for Dental Health Act of 2017 bill is intended to prevent dental disease and divert dental emergencies from high-cost centers (like hospital emergency rooms) to dental offices. Lines 15–17 of the bill include grant funding to support portable or mobile dental equipment, and this should lead to an expansion of opportunities to deliver and receive care through the use of portable dental equipment and mobile dental vans, i.e., portable and mobile dentistry (PMD). Historically, PMD has been valuable to bridge the access gap for those for whom transport can be a challenge, like children and the elderly. However, PMD could be valuable to large employers, allowing the employees to receive dental care with minimal disruption to their workday. Oral pain is known to affect work and school attendance, and improving access to dental care could benefit individuals, families, organizations, and communities.","PeriodicalId":47284,"journal":{"name":"Open Dentistry Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79827028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unusual Imaging Features of Dentigerous Cyst: A Case Report","authors":"C. Martinelli-Kläy, C. Martinelli, C. Martinelli, H. R. Macedo, T. Lombardi","doi":"10.3390/dj7030076","DOIUrl":"https://doi.org/10.3390/dj7030076","url":null,"abstract":"Dentigerous cysts (DC) are cystic lesions radiographically represented by a well-defined unilocular radiolucent area involving an impacted tooth crown. We present an unusual radiographic feature of dentigerous cyst related to the impacted mandibular right second molar, in a 16-year-old patient, which suggested an ameloblastoma or odontogenic keratocyst (OKC) because of its multilocular appearance seen on the panoramic radiography. A multi-slice computed tomography (MSCT), however, revealed a unilocular lesion without septations, with an attenuation coefficient from 3.9 to 22.9 HU suggesting a cystic lesion. Due to its extension, a marsupialization was performed together with the histopathological analysis of the fragment removed which suggested a dentigerous cyst. Nine months later, the lesion was reduced in size and then totally excised. The impacted mandibular right second molar was also extracted. Histopathological examination confirmed the diagnosis of a dentigerous cyst. One year later, the panoramic radiography showed a complete mandible bone healing. Large dentigerous cysts can sometimes suggest other more aggressive pathologies. Precise diagnosis is important to avoid mistakes since DC, OKC and ameloblastoma require different treatments. Histological examination is, therefore, essential to establish a definitive diagnosis. In our case, MSCT and the tissue attenuation coefficient analysis contributed to guide the diagnosis and management of the dentigerous cyst.","PeriodicalId":47284,"journal":{"name":"Open Dentistry Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81067982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dimensional Stability of a Preliminary Vinyl Polysiloxane Impression Material","authors":"F. Martins, J. Reis, Ignacio Barbero Navarro, P. Maurício","doi":"10.3390/dj7030081","DOIUrl":"https://doi.org/10.3390/dj7030081","url":null,"abstract":"Oral rehabilitation success depends upon the accuracy and dimensional stability of the impressions. The purpose of this study is to evaluate the dimensional changes of a first impression type VPS (Vinyl Polysiloxane) (Imprint™ 4 Preliminary Penta™ Super Quick, 3M ESPE™, St Paul, MN, USA). 10 samples were obtained from this silicone with an automatic mixing machine (Pentamix 2, 3M ESPE™, Seefeld, Germany) according to International Organization for Standardization (ISO) 4823:2000 and stored in the IPQ (Portuguese Institute for Quality) for one week. The measurements were performed by laser interferometry, according to the Michelson technique. The dimensional stability was calculated according to the formula specified in ISO (International Organization for Standardization) 4823:2000. A statistical analysis via a one-way repeated measures ANOVA was performed. The material shrinkage was 0.29 ± 0.15% after setting, 0.32 ± 0.21% at 24 h and 0.30 ± 0.23% after 1 week. No significant shrinkage of the silicone under investigation was found over time. This material can be stored for a week without the risk of clinically significant dimensional changes.","PeriodicalId":47284,"journal":{"name":"Open Dentistry Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74987962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Acknowledgement to Reviewers of Dentistry Journal in 2018","authors":"Seyed Amir, John W. Nieminen, P. Palomo, Leena Papaccio","doi":"10.3390/dj7010007","DOIUrl":"https://doi.org/10.3390/dj7010007","url":null,"abstract":"Rigorous peer-review is the corner-stone of high-quality academic publishing [...].","PeriodicalId":47284,"journal":{"name":"Open Dentistry Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2019-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83212620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cone Beam CT-Based Preoperative Volumetric Estimation of Bone Graft Required for Lateral Window Sinus Augmentation, Compared with Intraoperative Findings: A Pilot Study.","authors":"Nagla'a A Abdel-Wahed,&nbsp;Maha Ahmed Bahammam","doi":"10.2174/1874210601812010820","DOIUrl":"https://doi.org/10.2174/1874210601812010820","url":null,"abstract":"<p><strong>Introduction: </strong>The presence of an atrophic maxilla creates a serious challenge in cases of implant placement, while maxillary sinus pneumatization further complicates the surgery. This pilot study was performed to investigate the validity of two techniques used to estimate the volumes of bone graft material required in cases that included lateral window sinus augmentation.</p><p><strong>Materials and methods: </strong>Cone beam computed tomography was used for preoperative volumetric analysis of the maxillary sinus. The analysis was performed using the manual measurement of sinus dimensions, as well as automated measurements <i>via</i> the segmentation technique. The estimated volumes of required bone graft material were compared with actual intraoperative findings in cases requiring lateral window sinus augmentation. For this pilot study, only 5 patients were selected to be included.</p><p><strong>Results: </strong>To achieve 80% power and confidence interval of 95%, the sample size should be 35 patients. The correlation coefficient between the segmented volume and mm³ used was - 0.5332, whereas the coefficient between the manual volume and mm³ used was - 0.6784. Consequently, both results indicate that the two methods have a moderate negative correlation with the mm³ used.</p><p><strong>Conclusion: </strong>Performing a similar study with an increased number of patients, according to the calculated sample size, increases the possibility of revealing higher correlation between the methods used to analyze the partial volume of the sinus cavity. The estimated sinus volume of the area of augmentation, obtained by using either manual or segmentation techniques, could be considered as a maximum estimate for the required amount of graft material. Furthermore, the segmentation technique may be valuable in preoperative planning of sinus augmentation, as it reveals the topographic shape and morphology of the sinus.</p>","PeriodicalId":47284,"journal":{"name":"Open Dentistry Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2018-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2174/1874210601812010820","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"36727574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Is Conservative Surgery the Best Approach for Peripheral Calcifying Epithelial Odontogenic Tumors?","authors":"Isadora Luana Flores,&nbsp;Tissiana Rachel Rossi Schneider,&nbsp;Ana Carolina Uchoa Vasconcelos,&nbsp;Sandra Beatriz Chaves Tarquinio,&nbsp;Ricardo Alves de Mesquita,&nbsp;Ana Paula Neutzling Gomes","doi":"10.2174/1874210601812010856","DOIUrl":"https://doi.org/10.2174/1874210601812010856","url":null,"abstract":"<p><strong>Background: </strong>Peripheral Calcifying Epithelial Odontogenic Tumors (CEOT) rich in clear cells are a rare entity in the oral cavity, with only 14 previous case reports in the English literature. None have discussed recommended treatment approaches for extraosseous CEOT.</p><p><strong>Objective: </strong>This brief descriptive review describes a treatment approach for peripheral CEOT including the clear cell variant.</p><p><strong>Study design: </strong>A complete review of all well-documented extraosseous case reports with an emphasis on the treatment was performed. Additionally, the present article reports a case of a 21-year-old woman with an asymptomatic swelling in the gingiva finally diagnosed as peripheral CEOT abundant in clear cells.</p><p><strong>Results: </strong>Twenty-four cases of peripheral CEOT were described; conservative surgery was the first treatment approach in approximately 80% of cases, with only one recurrence.</p><p><strong>Discussion: </strong>Clear cell finding was not associated with more aggressive behavior.</p><p><strong>Conclusion: </strong>Conservative surgery may be an advantageous approach for this group of peripheral lesions with or without clear cells, with a recurrence rate of approximately 4%.</p>","PeriodicalId":47284,"journal":{"name":"Open Dentistry Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2018-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6210496/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"36728476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Epidemiology and Management of Bell's Palsy in the Sudan.","authors":"Ahmed Hassan Kamil Mustafa,&nbsp;Ahmed Mohammed Sulaiman","doi":"10.2174/1874210601812010827","DOIUrl":"https://doi.org/10.2174/1874210601812010827","url":null,"abstract":"<p><strong>Background: </strong>Bell's palsy is an acute idiopathic facial nerve paralysis of sudden onset. It is the most common cause of lower motor neuron facial nerve paralysis with an annual incidence of 15-30 per 100,000.The objective of this work is to study the prevalence and the management of Bell's palsy in the Sudan. A descreptive retrospective cross-sectional study was carried at Khartoum Teaching Dental Hospital, Khartoum General Teaching Hospital.In the retrospective, the records and files of 698 patients with Bell's palsy, were reviewed in relation to age, gender, site, risk factors, season, and type of treatment.In addition, 48 patients with Bell's palsy were evaluated using the House-Brackman scale in relation to the above-mentioned variables.Therefore, a total number of 746 cases were studied. Fifty five percent of them were females and the remaining 45% were males, around 38% of them were in the age group 21-40 year. Fifty seven percent of the patients were affected on the right side of the face. Winter was the commonest season of onset where 53.5% of the cases occurred. Steroids are the commonly prescribed drugs in majority of the cases, accounting for 47.3%.</p><p><strong>Study design: </strong>The study is a retrospective cross sectional hospital based study. The study was carried out in Khartoum Teaching Dental Hospital and in the Physiotherapy Department of Khartoum Teaching General hospital.The files and records of the patients with Bell's palsy in Khartoum Teaching Dental Hospital in the years 1/1/2004 -31/12/2008, and Khartoum Teaching General Hospital (physiotherapy department) in the years 2007- July 2009 (total number 746).</p><p><strong>Results: </strong>A total number of 746 cases were studied . Fifty five percent of them were females and the remaining 45% were male. Around 38% of them were in the group 21-40 year. Fifty seven percent of the patients were affected on the right side of the face. Winter was the commonest season of the onset where 53.5% of the cases occurred.</p><p><strong>Conclusion: </strong>The study showed predominance of females. A peak incidence was seen in the age group 21-40 years. A predilection was found for the right side of face.</p>","PeriodicalId":47284,"journal":{"name":"Open Dentistry Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2018-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6210498/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"36727575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microbiological Response to Periodontal Therapy: A Retrospective Study.","authors":"Vittorio Checchi,&nbsp;Gaia Pascolo","doi":"10.2174/1874210601812010837","DOIUrl":"10.2174/1874210601812010837","url":null,"abstract":"<p><strong>Background: </strong>Periodontitis is a multifactorial infection caused by a complex of pathogenic bacterial species that induce the destruction of periodontal structures.</p><p><strong>Objective: </strong>The aim of this study is to evaluate the presence and bacterial load of six periodontal pathogens bacteria, measured at initial visit and after osseous surgery in patients affected by chronic periodontitis and treated between 2005 and 2007.</p><p><strong>Methods: </strong>This cohort study was carried out on a sample of 38 consecutive patients affected by severe chronic periodontitis, diagnosed at baseline on the basis of probing depths equal to 6.68 ± 1.47 mm. On each subject, a microbiological test was performed before periodontal initial therapy and after osseous surgery (one year later). Five compromised teeth were chosen for each patient (the same teeth, before and after surgery), for a total of 190 teeth. Real-time PCR based analysis computed total bacterial load of the samples and quantified six periodontal pathogens: <i>Actinobacillus actinomycetemcomitans, Porphyromonas gingivalis, Tannerella forsythia</i>, <i>Treponema denticola, Fusobacterium nucleatum</i> and <i>Prevotella intermedia</i>. Data collection was made consulting medical charts.</p><p><strong>Results: </strong>Pocket probing depth reduction after surgery was 4.50 ± 1.54 mm (<i>p</i>=0.0001). The mean number of sites with bleeding at baseline was 2.08 ± 1.17 and 0.58 ± 1.00 after surgery (<i>p</i>=0.001). The mean number of sites with suppuration at baseline was 0.26 ± 0.86 and 0 after surgery (<i>p</i>=0.02). Cell count of each pathogen and total cell count were significantly higher at baseline than after surgery. Almost all bacteria presented a mean percentage reduction equal to that of the total count, except for <i>Aa</i> and <i>Pi,</i> which seemed to show a greater resistance. The difference of bacterial load, both before and after surgery, between smokers and non-smokers was not statistically significant (<i>p</i><0.05). A statistically significant correlation was detected between pocket probing depth variation and bleeding on probing variation before and after the surgery, controlling for age (r=0.6, <i>p</i>=0.001). No significant correlations were observed between pocket probing depth and bacterial loads, except for <i>Pg</i> (r=0.5, <i>p</i>=0.001), <i>Tf</i> (r=0.6, <i>p</i>=0.001) and <i>Td</i> (r=0.4, <i>p</i>=0.02).</p><p><strong>Conclusions: </strong>Reduction of presence and bacterial load of the examined periodontal pathogens bacteria after osseous surgery, along with periodontal pocket reduction, appeared to be essential to achieve and maintain periodontal stability over years.</p>","PeriodicalId":47284,"journal":{"name":"Open Dentistry Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2018-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2174/1874210601812010837","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"36727576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Separation of Nickel-Titanium Rotary and Reciprocating Instruments: A Mini-Review of Clinical Studies.","authors":"Marcelo Santos Coelho,&nbsp;Marcos de Azevêdo Rios,&nbsp;Carlos Eduardo da Silveira Bueno","doi":"10.2174/1745017901814010864","DOIUrl":"https://doi.org/10.2174/1745017901814010864","url":null,"abstract":"<p><strong>Objective: </strong>This review aimed to evaluate clinical studies that assessed separated NiTi rotary and reciprocating instruments.</p><p><strong>Design and methods: </strong>This review assessed clinical studies involving treatments performed by undergraduate students, graduate students, and endodontic specialists. This review evaluated studies using rotary instruments, reciprocating instruments, and hybrid techniques. The number of uses of the different NiTi rotary and reciprocating systems was also assessed.</p><p><strong>Results: </strong>The incidence of separation for rotary instruments ranged from 0% to 23%. Rotary instruments were used from 1 to 50 times depending on the instrument and tooth type. The lowest rate of incidence separation for rotary instruments was obtained by undergraduate students, using a hybrid technique. The separation incidence for reciprocating instruments ranged from 0% to 1.71%. Reciprocating instruments were mostly single-used; one study reported their use up to 3 times. Separation rate in reciprocating instruments was similar in single-use or in multiple uses 0.2%.</p><p><strong>Conclusions: </strong>Separation of instruments has dropped recently and seems to be a minor problem in current Endodontics. Multiple uses of NiTi rotary instruments are a possibility without significantly increasing the risk of instrument separation. Single and multiple uses of NiTi reciprocating instruments are also associated with low incidence of separation. Attempting to remove separated instruments should be carefully evaluated.</p>","PeriodicalId":47284,"journal":{"name":"Open Dentistry Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2018-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2174/1745017901814010864","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"36728477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}