1,721,157 research outputs found
Functional evaluation of implant supported prostheses
No full textPurpose: Surface electromyography is currently considered a useful tool for dentistry allowing
the validation of conventional morphological evaluations with an accurate and objective
quantification of the functional activity. An evaluation of full mouth resin prostheses on implants
was performed including both a morphological evaluation of occlusion and a measurement of
the actual impact of morphology on stomatognathic function.
Methodology: The measurement was performed using masticatory muscle electromyographic
recordings with ad-hoc software algorithms. In the present study, five patients with full mouth
resin prostheses on implants have been evaluated at the beginning of their prosthetic
reconstructions and after one year using surface electromyography. To verify the static
neuromuscular equilibrium of occlusion, functional evaluation of the left and right masseter and
temporalis anterior muscles was performed in all patients, and a set of indices was computed:
the Percentage Overlapping Coefficient – POC (an index of the symmetric distribution of the
muscular activity determined by the occlusion), the Torque Coefficient - TC (an index of the
possible presence of a mandibular torque) and the antero-posterior coefficient (an index of the
possible relative position of the occlusal center of gravity).
Results: One year after surgery during the maximum voluntary clench, all patients had
symmetric standardized potentials (POC values between 80% and 100%, and TC values larger
than 90%).
Conclusions: Surface electromyography indices were well super imposable to the values found
in healthy subjects with natural and normal occlusion, thus indicating that, at short time follow
up, a functionally stable occlusion could protect from resin prosthodontic fractures
Full-mouth zirconia-based implant-supported fixed dental prostheses : five year - results of a clinical pilot study
No full textIntroduction:
Full-mouth reconstruction using dental implants and CAD-CAM prosthodontic procedure is a new option model in oral rehabilitation. One of the most consolidated promising material is yttria-stabilized tetragonal zirconia polycrystals, usually called “zirconia”. It is chemically derived from zirconium sand, partially stabilized with yttrium, and then mechanically pressed into zirconia blocks that are used for CAD-CAM technology. In this paper we provide the 5-year results from a pilot study on full-mouth implant-supported zirconia-based fixed dental prostheses (FMIZBRs).
Methodology:
Five women aged 55-75 years had received FMIZBRs from the same private practice. At the 5-year follow up visit, restorations remained in situ and were still in use.
Results:
There were no failures and no biological complications during the follow-up period (100% survival rate). Eight FMIZBRs experienced some minor porcelain veneer fractures that were easily polished. None of the fractures impaired function or aesthetics. The patients were fully satisfied with the treatment.
Conclusion:
Results from this pilot study suggest that FMIZBRs can be a treatment option that is rapidly shaping the coming dental rehabilitation area on implants
Funzione e disfunzione dell’apparato stomatognatico: il ruolo delle valutazioni quantitative
No full textL’articolazione temporomandibolare (ATM) è l’unica articolazione mobile del cranio, e raccoglie in sé sia funzioni della vita di relazione sia funzioni viscerali. Come tutte le parti del nostro corpo, anche l’ATM può andare incontro ad alterazioni, che vengono a coinvolgere tutte le complesse funzioni dell’articolazione. In effetti, il numero dei pazienti con disordini temporomandibolari (temporomandibular joint disorders, TMD) che si rivolgono alle strutture cliniche odontoiatriche sta crescendo. I disordini temporomandibolari sono complessi, ed in realtà la loro genesi non è ancora del tutto chiara. Nel tentativo di rendere la diagnosi il più possibile oggettiva, sono stati proposti diversi protocolli operativi. Tra questi, uno dei metodi proposti è l’elettromiografia di superficie (EMG), un’indagine strumentale in grado di effettuare una registrazione obiettiva della funzione e disfunzione dell’apparato stomatognatico. Il protocollo sviluppato presso il nostro laboratorio utilizza sia testi dinamici sia test statici, ed è in grado di individuare se la disfunzione può essere influenzata dalla risposta propriocettiva del contatto dei denti o viceversa. Il protocollo tiene conto delle caratteristiche inerenti di variabilità del segnale, ed è in grado di fornire indicazioni quantitative che possono indirizzare al meglio il clinico verso il trattamento più efficace per il singolo paziente
Seven-year prospective clinical study on zirconia-based single crowns and fixed dental prostheses
Full text linkOBJECTIVES:
Zirconia-based prostheses are used for esthetic crown and fixed restorations, but follow-ups are still limited. The authors evaluated the 7-year clinical results of 303 zirconia core restorations, performed in a general dental private practice.
MATERIALS AND METHODS:
Clinical events (fracture and loss of retention, gingivitis, tenderness, excess cement, and temporary pain) were recorded in 303 zirconia core restorations positioned in 88 patients. Kaplan-Meier survival probability estimates were computed for failures (needed the replacement or removal of the prosthesis) and complications (resolved without replacing the prosthesis).
RESULTS:
One hundred and fifty single crowns (130 tooth-supported, 20 implant-supported) and 153 multiple units up to 6 elements (49 tooth-supported, 104 implant-supported) were followed-up for 7 years in 88 patients (40 men, 48 women), aged 35-89 years (mean 57). During the follow-up period, there were no complications for 287 (95 %) of the restorations. Sixteen restorations/abutment teeth (5 %) had some complication: extraction of abutment tooth (7, 2 %); caries (2, 1 %), porcelain veneer fracture (3, 1 %), loss of retention (4, 1 %). Nine (3 %) restorations were recorded as failures. The overall 7-year survival probability estimate for failures was 0.966 (95 % confidence limits, 0.932 and 0.983), for complications was 0.976 (95 % confidence limits 0.947 and 0.989), with a cumulative survival rate of 94.7 %.
CONCLUSIONS:
Within the analyzed follow-up, zirconia core restorations appear a good clinical solution, with favorable functional properties.
CLINICAL RELEVANCE:
All ceramic restorations can be successfully used for both single-and multiple-unit prostheses, either teeth or implants supported
Bilateral blindness in a patient with temporal arteritis after wisdom tooth extraction
No full textA 78-year-old woman reported pain in her right hemiface (middle and upper portions) together with nuchal headache, some days after upper right wisdom tooth extraction. She was treated with nonsteroidal anti-inflammatory drugs by her dentist. Three weeks later, a localized headache over her right superficial temporal artery was reported, and progressive bilateral blindness appeared. A biopsy showed a late stage of temporal arteritis. All the symptoms disappeared following corticosteroid treatment, except blindness. The possible complications linking oral bacteria and extraoral infections and diseases should always be attentively considered during the clinical management of fragile patients
Histomorphometric analysis of human maxillary sinus lift with a new bone substitute biocomposite : a preliminary report
No full textPURPOSE: To analyze radiographic and histological outcomes of maxillary sinus floor augmentation using a calcium-sulfate based allograft containing demineralized bone matrix particles.
MATERIALS AND METHODS: Fifteen maxillary sinus lift procedures with simultaneous placement of titanium implants were performed in 12 patients of both genders aged 36-71 years. Each sinus cavity was filled by the biocomposite. After 3 months of healing, all surgical sites were uncovered and bone biopsies were retrieved for undecalcified histology and histomorphometry. The ratio between the original and the grafted sinus height (GSH/OSH) was computed using a panoramic radiography taken immediately after surgery and at 3 months of healing, and the two ratios were compared by Wilcoxon signed-rank test.
RESULTS: By 3 months, all implants were stable without clinical and radiographic signs of infection. Significant changes in GSH/OSH during healing were seen (2.7 +/- 0.6 initially vs. 2.6 +/- 0.5 after healing; p = 0.01). Histologic findings showed newly formed bone surrounding the residual grafted particles without inflammation. At 3 months, mean regenerated bone density was 33.8 +/- 8.6%; marrow spaces amounted to 32.3 +/- 10.3%; residual graft was 33.9 +/- 9.0%. Similar histomorphometric and radiographic results were obtained independently from patient age or sex.
CONCLUSIONS: The analysed putty seems to be a safe and effective graft material for maxillary sinus floor augmentation by accelerating bone regeneration and thus reducing the healing time
Correlazioni clinico-epidemiologiche tra conta periferica di CD4+ e affezioni delle mucose orali in pazienti HIV-positivi e con AIDS.
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