1,720,962 research outputs found
Morphological and chemical characteristics of different titanium surfaces treated by bicarbonate and glycine powder air abrasive systems
No full textEffect of plaque accumulation and occlusal overload on peri-implant bone loss
No full textThis paper presents a case report where the influence of plaque accumulation and overload on a dental implant was observed. The patient presented crown loss on one implant affected by peri-implant bone resorption and gingival inflammation associated with poor oral hygiene. After 12 months a single crown was delivered, but as soon as the occlusal load was applied bone loss and implant failure occurred. In the present case report the dental implant remained stable as long as the implant was not loaded, although a 100% plaque index and bleeding on probing were present during the entire followup period. In contrast, as soon as an occlusal load was applied periimplant bone loss and implant failure occurred. These observations suggest that plaque accumulation alone is not a triggering factor for peri-implant bone loss and implant failure. On the contrary, occlusal load, when not properly controlled, might cause bone resorption
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Comparison of Bone-Level and Tissue-Level Implants: A Pilot Study with a Histologic Analysis and a 4-Year Follow-up
No full textComparison of biofilm removal using glycine air polishing versus sodium bicarbonate air polishing or hand instrumentation on full-arch fixed implant rehabilitations: a split-mouth study
No full textObjectives: To compare the cleaning efficacy of glycine air polishing against two different professional oral hygiene techniques on implants supporting full-arch fixed prostheses. Method and materials: Thirty patients with a total of 32 implant fixed full-arch rehabilitations in the maxilla and/or mandible (134 implants) were included. After the removal of the screw-retained prostheses, baseline peri-implant spontaneous bleeding (SB), Plaque Index (PI), probing depth (PD), and bleeding on probing (BOP) were recorded (T0). Three oral hygiene treatments were assigned randomly following a split-mouth method: all the patients received glycine air polishing (G) in one side of the arch (n = 32), and sodium bicarbonate air polishing (B) (n = 16) or manual scaling with carbon-fiber curette (C) (n = 16) was performed in the opposite side. After the hygiene procedures, PI and SB were recorded and patient's comfort degree towards the three techniques was analyzed by questionnaires using a rating scale from 1 to 5 (T1). Results: PI reduction was significantly higher for G (T0, 2.88 ± 1.37;T1, 0.04 ± 0.21) and B (T0, 3.13 ± 1.34; T1, 0.0 ± 0.0) as compared with C (T0, 2.15 ± 1.46; T1, 0.44 ± 0.7) (P < .001). B reported the highest mean value of SB (T0, 0.0 ± 0.0; T1, 3.42 ± 0.75) compared with G (T0, 0.05 ± 0.21;T1, 1.60 ± 1.05) and C (T0, 0.07 ± 0.24; T1, 0.73 ± 0.91) (P < .001). A significant difference in comfort mean score was found between G (4.8 ± 0.5) and B (3.5 ± 1.7) (P = .014), no difference between G and C (4.7 ± 0.7) (P = .38). Conclusion: Professional oral hygiene on implants using glycine air polishing showed high levels of both cleaning efficacy and patients' acceptance
A Luting Technique for Passive Fit of Implant-Supported Fixed Dentures.
No full textSeveral factors contribute to distortion of implant prostheses during fabrication and could prevent passive, accurate adaptation between implants and implant frameworks. The misfit between implants and restorative components may be significant and possibly lead to biologic or mechanical complications. The aim of this article is to describe a laboratory luting technique used to lute implant cylinders to metal frameworks in implant prostheses. This technique provides accurate, passive fits. According to this technique, titanium implant cylinders provided with corresponding external castable cylinders are used. Implant cylinders are screwed into the analogs in the master cast while the castable cylinders on top are splinted together using castable resin to realize a castable resin pattern. After casting, the framework is adjusted and cemented to the titanium cylinders on the master cast. Due to its ease and quickness of use and clinical efficiencies, this technique is deemed particularly useful in immediate loading rehabilitations
Influence of Different Surface Characteristics on Peri-implant Tissue Behavior: A Six-Year Prospective Report.
Full text linkPURPOSE:
The aim of this study was to evaluate the behavior of hard and soft tissue around implants with different surface treatments.
MATERIALS AND METHODS:
Eight patients were identified for this study. Each patient received at least 2 implants (1 control, 1 test) into an edentulous quadrant, for a total of 10 pairs of implants. Two types of implants were used: hybrid implants (control) with a dual acid-etched surface in their apical portion and a machined coronal part, and test implants with an acid-etched surface throughout their entire length. Standardized periapical radiographs were taken at baseline, 3 months, 6 months, and 1 year post implant placement and then annually until the 6-year follow-up. Bleeding on probing (BOP) and Plaque Index (PI) were recorded annually. Probing depth (PD) was recorded at the 6-year follow-up.
RESULTS:
Moderate crestal bone remodeling was observed during the 1-year postimplant placement evaluation (P=.001), and test implants revealed smaller marginal bone resorption (P=.030). No significant changes in bone level were observed between the 1-year and the 6-year follow-up appointments, and a significantly smaller bone resorption was found at test implants. No statistically significant differences in bone resorption were found between maxilla and mandible. No statistically significant differences were detected between test and control implants for BOP, PI, or PD.
CONCLUSIONS:
The preliminary results suggest that implant surface characteristics might affect the bone remodeling phase subsequent to the surgical trauma. However, once osseointegration was established, implant surfaces did not affect bone maintenance over time. Implant surfaces did not affect soft tissue behavior. The results of this pilot study need to be confirmed in a study with a larger sample size and over a longer time frame
Influenza delle diverse caratteristiche di superficie sul comportamento del tessuto perimplantare: report prospettico a sei anni
No full textScopo: lo scopo di questo studio era quello di valutare il comportamento del tessuto
duro e molle intorno a impianti con trattamenti di superficie diversi. Materiali e Metodi:
per questo studio sono stati identificati otto pazienti. Ciascun paziente ha ricevuto
almeno 2 impianti (1 controllo, 1 test) in un quadrante edentulo, per un totale di 10 coppie
di impianti. Sono stati utilizzati due tipi di impianti: impianti ibridi (controllo) con una
superficie a doppia mordenzatura acida nella parte apicale e macchinata nella parte coronale;
impianti test con superficie mordenzata con acido su tutta la lunghezza. Le radiografie
periapicali standardizzate sono state eseguite al momento dell’inserzione degli
impianti, a 3 mesi, a 6 mesi e a 1 anno dal posizionamento degli impianti e poi annualmente,
con un follow-up a 6 anni. Il sanguinamento al sondaggio (BOP) e l’indice di placca
(PI) sono stati registrati annualmente. La profondità di sondaggio (PD) è stata registrata
al follow-up a 6 anni. Risultati: nel primo anno di osservazione dopo il posizionamento
degli impianti, si è osservato un moderato rimodellamento dell’osso crestale (P = 0,001)
e gli impianti test hanno fatto registrare un riassorbimento dell’osso marginale inferiore
(P = 0,030). Nel periodo da 1 anno fino al follow-up a 6 anni, non si sono osservati cambiamenti
significativi del livello osseo ed è stato registrato un riassorbimento osseo significativamente
inferiore per gli impianti test. Non sono state rilevate differenze statisticamente significative
per quanto riguarda il riassorbimento osseo mascellare superiore e mandibola. Non sono
state rilevate differenze statisticamente significative tra gli impianti test e controllo per quanto
riguarda BOP, PI o PD. Conclusioni: i risultati preliminari suggeriscono che le caratteristiche di
superficie degli impianti potrebbero influenzare la fase di rimodellamento osseo successiva
al trauma chirurgico. Però, a osteointegrazione avvenuta, le superfici implantari non hanno
influenzato il mantenimento dell’osso nel tempo. Le superfici implantari non hanno influenzato
il comportamento del tessuto molle. I risultati di questo studio pilota devono essere
confermati in uno studio con un campione di dimensioni maggiori e con follow-up più lungo
Oral Health–Related Quality of Life and Full-Arch Immediate Loading Rehabilitation: An Evaluation of Preoperative, Intermediate, and Posttreatment Assessments of Patients Using a Modification of the OHIP Questionnaire
No full textThe aim of this study was to assess oral health related quality of life (OHRQoL) of patients before, during and after completion of implant-supported full-arch immediate loading rehabilitation according to the Columbus Bridge Protocol (CBP). 25 patients with compromised dentition were rehabilitated according to the CBP and were assessed for OHRQoL using 4 questionnaires specifically realized for this study and inspired to the OHIP (Oral Health Impact Profile) questionnaire. Patients assessed themselves before surgery, during the healing period (1 week and 2 months after surgery) and after definitive prosthodontic treatment (4 months after surgery). The questionnaires specifically investigated patients' pain, confort, home oral hygiene habits, satisfaction related to esthetics, masticatory ability, phonetics and general satisfaction toward the treatment.Patients reported an improvement of OHRQoL after full-arch immediate loading rehabilitation. A statistically significant improvement in aesthetic and chewing ability was found. After 4 months 92% of the patients did not feel tense with their smile, 96% did not show problems to relate with other people or smiling, 92% did not show difficulty to eat some foods. Phonetics was found to be a critical issue, especially in the intermediate phase of healing. One week after surgery the percentage of patients who was very satisfied with phonetics slightly decreased from 48% to 36%. The assessment of patients' OHRQoL related to full-arch immediate loading implant therapy exhibited a significant improvement of their quality of life. The questionnaires herein presented could be an effective tool to evaluate patients' reaction to oral rehabilitation
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