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Statement of problem
Clinicians are aware that the vertical dimension of occlusion and the interocclusal rest space (IRS) are 2 major factors that require consideration in the management of patients needing oral reconstructive procedures. However, how the dimensions vary with age and prosthetic status is unclear.Purpose
The purpose of this clinical study was to analyze the IRS in dentate, partially edentulous, and completely edentulous participants using both conventional and electromyographic (EMG)-based methods. The effect of age and prosthodontic status on the clinical and EMG assessment of the IRS was also explored.Material and methods
The IRS was determined for a group of dentate (n=31) and partially edentate (n=31) participants, as well as a group of completely edentulous (n=31) participants who had worn dentures for at least 10 years before participating in the study. Clinical and EMG-based assessments (monitoring both elevator and depressor activity) were carried out using 5 different methods: rest, relaxing mask, phonetics, deglutition, and myobalance. Bivariate and multivariate analyses (forward stepwise linear regression models) were performed to compare the effect of age and prosthodontic status on the IRS (α=.05).Results
The average IRS values obtained from clinical and EMG-based assessments were significantly greater among dentate participants (2.8 ±0.4 mm and 3.6 ±0.6 mm, respectively) than partially edentulous (1.9 ±0.5 mm and 2.6 ±0.5 mm) and completely edentulous participants (1.4 ±0.5 mm and 2.2 ±0.6 mm). The IRS values obtained using the 5 methods of clinical assessment were statistically smaller than those obtained by EMG. Correlation and regression analyses showed that age and extended edentulism significantly decreased the IRS. For the IRS determined clinically, a decrease was found of 0.01 to 0.02 mm/year, based on the age of the participant. However, this decrease became greater (0.05 to 0.6 mm) where the participant had changed from being dentate to partially edentulous and partially edentulous to completely edentulous.Conclusions
The IRS becomes significantly smaller in relation to age and denture extension. The rest position in the clinical examination was located cranial to the position used to make the EMG-based measurement. Small but significant differences were found between the IRS values obtained in the clinical and EMG-based methods of assessment in all the prosthetic groups. 相似文献2.
Priscilla Medina-Sotomayor Agustín Pascual-Moscardo Isabel Camps A 《The Journal of prosthetic dentistry》2019,121(5):811-820
Statement of problem
The accuracy of digital scanners is acceptable for scanning a complete dental arch. However, whether that accuracy is sufficient for only 1 tooth within the dental scan of a complete dental arch is unclear.Purpose
The purpose of this in vitro study was to evaluate and compare the accuracy of 4 intraoral scanners on a complete dental arch and on prepared teeth digitally isolated from the digital scan in terms of trueness and precision.Material and methods
A model of a complete dental arch with tooth preparations was scanned 40 times with each of the 4 digital scanners. Their accuracy was evaluated by using 3-dimensional (3D) software to compare the test models with a highly accurate reference model. The data were digitally processed to isolate the prepared teeth and evaluate them in the same way. The data were statistically analyzed using the Levene test and the Tamhane's T2 test (α=.05).Results
In scans of a complete dental arch, the True Definition scanner had the best accuracy values, followed by TRIOS, iTero, and Omnicam. For prepared teeth isolated from the dental arch, both True Definition and TRIOS had the best values, followed by iTero and Omnicam.Conclusions
In both long-span scans of the complete dental arch and isolated prepared teeth, the True Definition scanner had the greatest accuracy, closely followed by TRIOS. 相似文献3.
Pablo Castelo-Baz Selenia Quijada-López Germán Barbieri Petrelli Ramón Miguéns Vila Mercedes Pérez-Heredia Benjamín Martín-Biedma 《The Journal of prosthetic dentistry》2019,121(4):553-556
Surgical extrusion should be considered as an alternative treatment in patients with structurally compromised teeth that retain coronal integrity and have favorable root anatomy. The procedure described is straightforward and can be performed quickly. A situation in which it was used to treat a maxillary premolar with substantial structural loss but well-preserved periodontal attachment is presented. The biologically oriented preparation technique is a conservative method of tooth restoration. 相似文献
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J.L.G.C. Monteiro E.P. Pellizzer C.A. Araújo Lemos S.L.D. de Moraes B.C. do Egito Vasconcelos 《International journal of oral and maxillofacial surgery》2019,48(9):1241-1249
The aim of this systematic review was to test the following hypotheses: (1) that there is no difference in implant survival rate between individuals with overweight or obesity and those who are within the ideal weight range; (2) that there are no differences between these groups regarding indicators of peri-implant health. Two independent reviewers performed a literature search of the PubMed/MEDLINE, Scopus, and Cochrane Library databases for studies published up to April 1, 2018. A meta-analysis was performed to determine the risk difference for implant failure and mean difference for marginal bone loss, probing depth, and bleeding on probing. Six studies were selected for review, involving a total of 746 patients with 986 implants: 609 in overweight or obese individuals and 377 in individuals within the ideal weight range. The findings of this systematic review indicate that the first hypothesis should be accepted, since no statistically significant difference in implant survival rate was found between individuals with overweight/obesity and those within the ideal weight range (P = 0.64). The second hypothesis was rejected, as the review indicated a difference in marginal bone loss (P < 0.00001), probing depth (P < 0.00001), and bleeding around dental implants (P < 0.00001). 相似文献
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C.A. Salcedo-Gil A. Prieto Gundin M. Alberola Ferranti J. Rubio-Palau 《The British journal of oral & maxillofacial surgery》2019,57(4):365-367
Lymphoepithelial carcinoma of the accessory parotid gland is rare, and to our knowledge, only two cases have previously been reported. It has an association with the Epstein-Barr virus and is usually seen in Asians and Greenland Eskimos. We report a case of lymphoepithelial carcinoma of the left accessory parotid gland in a 59-year-old European man who had been raised in the Belgian Congo. After excision of the left accessory parotid gland with preservation of the facial nerve, he recovered well without complication, and there was no evidence of locoregional recurrence or distant metastases after follow up of 3.5 years. 相似文献
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Guillermo de la Rosa Castolo Sonia V. Guevara Perez Pierre-Jean Arnoux Laurent Badih Franck Bonnet Michel Behr 《The Journal of prosthetic dentistry》2019,121(3):546.e1-546.e10
Statement of problem
Implant-supported overdentures (IODs) are a treatment option for patients with complete edentulism. However, this treatment increases the possibilities of peri-implant complications, characterized by inflammation or partial loss of surrounding hard and soft tissues.Purpose
The purpose of this finite element analysis study was to evaluate the mechanical performance of different bar-IOD designs under different clinical configurations by comparing the stress and strain distribution on the bone during secondary stabilization.Material and methods
A finite element model of the mandible representing a patient with complete edentulism was developed. Different designs of bar-IODs were modeled and compared. The parameters studied were the material properties (cobalt-chromium, zirconium dioxide, titanium grade 5, and titanium grade 4), diameter and bar-IOD cross-sectional shape, tilt of the posterior implants (30 degrees), presence of a distal extension cantilever in the bar-IODs (12 mm), and number of implants (4 or 6). Two different mastication loading conditions were analyzed. One- and 2-way ANOVAs and the Tukey honestly significant differences post hoc test (α=.05) were used to determine the significant von Mises stress and strain values in the bone.Results
The 4 materials tested in the bar-IOD did not have a significant mechanical effect on the bone (P<.05). A smaller diameter and structure of the bar-IOD led to significantly higher bone stress (P<.001). A distal extension cantilever led to an increased stress concentration (model M1 versus model M3: P<.001), which reached 50% in the event of tilting of the posterior implants (model M2 versus model M4: P<.001). Tilting of the posterior implants alone, without extension, had a nonsignificant effect (model M3 versus model M4: P=.999). Model M5 supported with 6 implants reduces the stress transferred to the bone compared with model M3 supported with 4 implants (P<.05).Conclusions
Distal extensions in bar-IODs, the tilt of the posterior implants, and the low amount of material in the cross-sectional area in the bar-IOD were the most influential parameters on the mechanical resistance of dental implants in the mandibular bone. 相似文献14.
Wenceslao Piedra Cascón Juan Ruiz de Gopegui Marta Revilla-León 《The Journal of prosthetic dentistry》2019,121(5):741-745
Computer-aided design and computer-aided manufacturing (CAD-CAM) technologies have been successfully integrated into the digital workflow to treat completely edentulous patients. However, the digital design and manufacturing technique of the baseplate and occlusion rims have not yet been developed into the digital workflow. This article describes a novel digital workflow using extraoral digitizing procedures, open-source CAD software, and additive manufacturing technologies to obtain a 3D patient. This virtual patient can then be used to plan treatment for a completely edentulous patient, with which the maxillary baseplate and occlusion rims are digitally designed. The workflow allows the digital determination of tooth exposure at rest, the dental midline, the location of the canines, and the determination of the occlusal plane related to the Camper plane. The digital determination of these parameters increases the predictability of the treatment, reducing laboratory and clinician time and costs. 相似文献
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