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Biomedical subjects

T Testori

Publications and source records attributed to T Testori.

At least 19 recordsLinked to original sources
PubMed2006

Clinical and anatomical factors limiting treatment outcomes of gingival recession: a new method to predetermine the line of root coverage.

Complete root coverage is not always achievable, even in gingival recession with no loss of interproximal attachment and bone. The cemento-enamel junction is the most widely used referring parameter to evaluate root coverage results. The aim of the present study was to describe the most frequent diagnostic mistakes that may lead to incomplete root coverage in Miller Class I and II gingival recessions and to suggest a method to predetermine the level/line of root coverage in non-molar teeth. The line of root coverage (i.e., the level/line to which the soft tissue margin will be positioned after the healing process of a root coverage surgical technique) was predetermined by calculating the ideal vertical dimension of the interdental papilla of the tooth with the recession defect. This method was applied to 120 recession-type defects affecting non-molar teeth of 80 young healthy subjects that were treated with root coverage surgical procedures over the last 5 years. All recessions were Miller Class I or II and were associated with at least one of the following characteristics: 1) traumatic loss of the tip of the interdental papilla(e); 2) tooth rotation; 3) tooth extrusion with or without occlusal abrasion; and 4) a cervical abrasion defect with no evidence of the cemento-enamel junction. The line of root coverage may be considered the clinical cemento-enamel junction because it may substitute the anatomic cemento-enamel junction when this is no longer clinically visible on the tooth with recession or when the ideal conditions to obtain complete root coverage are not fully represented.

Dental Occlusion, Traumatic↗
PubMed2005

Endoscopic periradicular surgery: a prospective clinical study.

We did apicectomies of 30 teeth with periradicular lesions in 23 patients, using a 3 mm endoscope. Two patients failed to attend for postoperative assessment and of the remaining 21 patients who had 28 teeth treated the operation was judged after 1 year to be a success in 26 (93%).

Adult↗
PubMed2004

Etched implants: a comparative surface analysis of four implant systems.

Surface texturing by acid etching has recently become popular among dental implant manufacturers. The aim of this study was to compare the surface topography of four implant systems and to check the reproducibility of the industrial process of each implant system. Three implants per system have been selected from three distinct batches. They were observed under a scanning electron microscope (SEM), and roughness was determined with a contact profilometer by measuring five height-descriptive parameters (Ra, Rq, Rz(ISO), Rt, and Rsk, a texture parameter Sm, and a hybrid parameter RDeltaq. The analysis showed that each implant system displayed a distinct surface topography that could not be mistaken. When sandblasting was performed prior to etching, surface topography was a combination of macro- and microroughness. The roughness and the amount of remaining sand varied among the batches, showing that the industrial process is not fully developed. Deviation from the released technical information was found for two out of four implant manufacturers. Based on the available biological and clinical data on textured surfaces, it is suggested that it is bone interlocking at the interface that maintains the biological properties of textured surfaces, rather than a strong implant fixation per se.

Dental Implants↗
PubMed2004

Effect of root-end resection and root-end filling on apical leakage in the presence of core-carrier root canal obturation.

AIM: To evaluate the apical seal of canals filled with a core-carrier obturator following root-end resection with and without a root-end filling. METHODOLOGY: Thirty single-rooted human teeth with single canals were used. Root canal treatment was performed and canals filled with a core-carrier obturation technique. The teeth were then randomly assigned to three groups (n = 10). In the first group root canal filling only was performed. After orthograde filling, the teeth of the second group were resected apically, perpendicular to the major axis of the root. In the third group after apical resection, a root-end cavity was prepared using ultrasonic diamond retrotips and the cavities filled with Super-EBA cement. During a period of 3 h and with a headspace pressure of 0.12 atm, methylene-blue solution was forced through a tube that was connected to the apical end of each tooth specimen. The coronal end of the tooth was connected to a capillary tube containing an air bubble. Leakage was evaluated by observing the distal displacement of the air bubble. The roots were then sectioned along their long axis. Using a stereomicroscope, linear dye infiltration at the dentine-cement interface was determined. Kruskal-Wallis and Mann-Whitney tests were used to compare the three groups. RESULTS: Linear dye infiltration was significantly greater in root canals filled with the core-carrier obturators and resected apically (0.9 +/- 0.9 mm) when compared with those that had root-end fillings (0.2 +/- 0.4 mm). Air bubble displacement was not observed. CONCLUSION: Root-end filling improves the sealing of roots with core-carrier obturation following root-end resection.

Adolescent↗
PubMed2001

Immediate loading of Osseotite implants: a case report and histologic analysis after 4 months of occlusal loading.

A growing number of clinical reports show that early and immediate loading of endosseous implants may lead to predictable osseointegration; however, these studies provide mostly short- to mid-term results based only on clinical mobility and radiographic observation. Other methods are needed to detect the possible presence of a thin fibrous interposition of tissue that could increase in the course of time and lead to clinical mobility A histologic evaluation was performed on two immediately loaded Osseotite implants retrieved after 4 months of function from one patient. He had received a total of 12 implants in the mandible, of which six were immediately loaded and six were left to heal in a submerged way Clinical and histologic osseointegration was consistently achieved for both of the retrieved immediately loaded implants. Osteogenesis and bone remodeling on the Osseotite surface were not impeded by immediate loading as shown by histomorphometric evaluation, which revealed high levels of bone-to-implant contact ranging from 78% to 85%. This immediate loading protocol involving bilateral splinting of six Osseotite implants in the mandible proved to be successful after 4 months of loading. Further long-term clinical and histologic studies are needed before introducing this immediate loading protocol as a routine procedure in implant therapy.

Bone Remodeling↗
PubMed2000

Chlorhexidine spray versus chlorhexidine mouthwash in the control of dental plaque after periodontal surgery.

BACKGROUND/AIMS: This clinical trial aimed at comparing 2 different means of delivering chlorhexidine digluconate (CHX) in the oral hygiene phase during the 2 weeks following periodontal surgery. METHOD: 40 patients were randomly divided into 2 groups: A (using CHX mouthwash) and B (using CHX spray). Professional oral hygiene was carried out immediately before surgical operation. For 7 days after surgery, group A used CHX mouthwash and group B CHX spray on the teeth involved in the surgical procedure, while mechanical oral hygiene was maintained only on the teeth not involved surgically. After suture removal, on the 7th day, patients were allowed to perform mechanical oral hygiene also on surgical sites. Plaque index (PI) and stain index (SI) were evaluated on the 7th and 14th days after the operation. RESULTS: In both groups, PI increased similarly with respect to the baseline in surgically involved teeth, being 0.25+/-0.41 (SD) and 0.15+/-0.26, respectively, in A and B, on day 7, and 0.14+/-0.23 (A) and 0.10+/-0.22 (B), on day 14. There was no significant difference between A and B on either day 7 or 14. On the contrary, SI increased significantly in respect to the baseline over the 14 days in group A at both involved and not involved sites, while it did not differ from the baseline in group B. CONCLUSIONS: The present results indicate that the efficacy of CHX spray in the post-surgical control of dental plaque is not different from that of CHX mouthwash. Tooth staining, on the contrary, was significantly lower in the group using CHX spray. The observed effects might be related to the way of delivering CHX and to the total dose administered, about 80% lower in group B in respect to A. Further studies are needed to validate the preliminary findings of the present study.

Adult↗
PubMed1999

Success and failure in periradicular surgery: a longitudinal retrospective analysis.

The objective of the present study was to compare the success rates of 2 different periapical surgical techniques, the traditional technique with rotary instruments and the ultrasonic technique, which uses ultrasonic retrotips. A longitudinal retrospective study was carried out on 302 apices (181 teeth) that had undergone periapical surgery. Surgical outcome was evaluated by 2 independent operators using standardized periapical radiographs. Each radiographic finding was classified into 1 of 4 groups: complete healing, incomplete healing, uncertain healing, and unsatisfactory outcome (failure). An SAS statistical analysis system was used for data management and analysis. Prognostic factors were determined by means of the Fisher exact test. Complete healing after 4.6 years (the average follow-up period) was observed in 68% of the teeth treated through the use of the standard technique and 85% of those treated through the use of the ultrasonic technique. The success rate increased as the follow-up period lengthened (68.4% at 2 years vs 80% at 6 years). The success rate was higher in maxillary (77.9%) than in mandibular (66.1%) teeth. A comparison between the retrofilling materials was not feasible because all teeth in the standard technique group were retrofilled with amalgam and all teeth in the ultrasonic group were retrofilled with Super-EBA.

Adult↗
PubMed1999

A human histologic analysis of osseotite and machined surfaces using implants with 2 opposing surfaces.

A human histologic study was conducted to compare the percentage of bone-to-implant contact (BIC) at 6 months for Osseotite and machined, commercially pure titanium implant surfaces. To eliminate potential influences caused by differences in bone density at different intraoral locations, 2 mm x 5 mm, threaded, 2-surfaced titanium implants were manufactured; 1 side received the Osseotite surface modification and the opposite side maintained a machined surface. In each of 11 patients, 1 test implant was placed in the posterior maxilla (Types III and IV bone) during conventional dental implant surgery. Following 6 months of unloaded healing, the conventional implants were uncovered, and the test implants and surrounding hard tissue were removed. Histologic analysis indicated that at 6 months of unloaded healing, the mean BIC value for the Osseotite surfaces (72.96% +/- 25.13%) was statistically significantly higher (P < 0.05) than the mean BIC value for the machined surfaces (33.98% +/- 31.04%). When the BIC values for the machined and Osseotite surface pairs were ranked from high to low based on the machined BIC value range of 93% to 0%, the upper 50th percentile (20 surface pairs) mean BIC value was 86.1% +/- 16.7% for the Osseotite surfaces and 60.1% +/- 18.3% for the machined surfaces. The lower 50th percentile (19 surface pairs) mean BIC value was 59.1% +/- 25.3% for the Osseotite surfaces and 6.5% +/- 10.8% for the machined surfaces. Differences between mean BIC values for the 2 surfaces in both the upper and lower 50th percentiles were statistically significant (P < 0.05). The results of this study indicate that in the poorer quality bone typically found in the posterior maxilla, a statistically significantly higher percentage of bone contacts Osseotite surfaces when compared to opposing machined surfaces on the same implant.

Alveolar Process↗
PubMed1998

A prospective multicenter study evaluating loading of osseotite implants two months after placement: one-year results.

Historically, the recommended time between placement and functional loading of machined-surface dental implants has been 3 months for the mandible and 6 months for the maxilla. However, such recommendations are a result of evaluating randomly chosen healing times during the initial phase of implant development and are based on the subsequent clinical outcome of either implant integration or mobility. In recent years, histologic and experimental studies have shown that specifically designed micro-topographic implant surfaces can result in increased bone-to-implant contact at earlier healing times than obtained with machined-surface implants. Histologic and clinical studies investigating early and immediate implant loading support the premise that implants can be placed into function earlier than previously recommended. With the development of specifically designed implant surfaces and the utilization of time-saving surgical (one-stage surgical protocol) and prosthetic (implant position indexing) techniques, patients are now being restored and returning to function sooner than previously thought possible. The purpose of this multicenter clinical investigation is to evaluate the efficacy of loading Osseotite dental implants (3i-Implant Innovations Inc., Palm Beach Gardens, Florida) at 2 months and to determine the effect of early loading on implant performance and survival. A total of 429 Osseotite implants were placed in 155 patients (87 females and 68 males; mean age 54.0 +/- 13.7 yr), at 10 study centers, and subsequently loaded 2.1 +/- 0.7 months following placement. A single-stage surgical protocol was followed, with implants indexed immediately or impressed 4 to 6 weeks following placement. Patient restorative treatments included placement of 83 single-implant provisional restorations and 129 splinted, two-, three-, and four-implant supported maxillary and mandibular provisional restorations. The mean time from prosthetic loading to the most recent follow-up evaluation was 10 +/- 1.3 months. Seven of the 429 implants did not integrate; of these, six were identified prior to loading and one was identified 1 month after loading. The cumulative implant survival rate was 98.5% at 12.6 months. The cumulative post-loading implant survival rate was 99.8% at 10.5 months. The preliminary results of this clinical investigation suggest that successful functional loading of the Osseotite dental implant is possible at 2 months following noncomplicated implant placement.

Adult↗
PubMed1993

Vertical root fractures in endodontically treated teeth: a clinical survey of 36 cases.

A clinical study was done on 36 original cases of vertical root fractures along with the data gathered from 32 cases published previously in the literature. Vertical root fractures most frequently occur in posterior teeth in patients between 45 and 60 yr of age. The average elapsed time between the endodontic treatment and the subsequent diagnosis of vertical fracture was found to be approximately 10 yr. The evidence and symptoms most often found are mild pain in the area of the fractured tooth often accompanied by swelling and fistula, along with a deep pocket in just one area of the attachment surrounding the tooth. The sign most often revealed by X-ray is a radiolucent periradicular band.

Age Factors↗
PubMed1991

[Radiographic interpretation of experimentally produced osseous lesions in the human mandible].

Using rotary instruments drilled bony cavities which differed in diameter and depth into a human jaw. X-rays were taken and developed employing a very precise and accurate technique to obtain high definition radiograph. From a careful study of these x-rays it was found that localized lesions in cancellous bone alone are difficult to visualize on x-rays, whereas they are easily noticeable when the cortical bone is involved.

Humans↗
PubMed1991

[Access cavity for endodontic treatment of anterior teeth].

In this study the authors investigated a group of front teeth, extracted because of the periodontal problems, into which an access cavity have been drilled at the point shown on an x-ray between two straight lines which start at the apex and are tangent to the pulp chamber. These teeth were then horizontally sectioned at the cement-enamel junction to see how much dental substance remained compared to a control group into which a traditional opening had been made through the palatal surface. The result show a greater conservation of dentin when the direct method of opening discussed herein was used.

Dental Cavity Preparation↗
PubMed1991

[Pulp necrosis following prosthetic-periodontal treatment of vital teeth].

This study investigated the frequency of periapical lesions following pulpal necrosis in vital teeth used as abutments in periodontal-prosthetic therapy. The study was conducted on a continuative series of 1000 teeth treated at least 2 years before the start of the investigation. 500 teeth were treated by specialist and 500 by general practitioners. The dental records of this sample were stored into a computer, analyzed and compared, and the chi-square index was calculated. Periapical lesions were found in 22.6% of the teeth. Maxillary incisors had the highest number of lesions (36.8%). The percentage of lesions increased as periodontal involvement became more severe (37.2%) with severe involvement as opposed to 18.5% with moderate involvement). The frequency of lesions was lower in the group of teeth treated by specialists than in the group treated by general practitioners (13.8% as opposed to 31.4%).

Dental Abutments↗
PubMed1990

[SEM evaluation of a new system of intracanal anchorage for reconstruction of endodontically treated anterior teeth].

The Authors investigated a new kind of parallel-sided cylindrical posts used for anterior teeth (Triax--Whaledent Inc.--New York NY). Twenty-four freshly extracted maxillary incisors were selected for the study. Root canal therapy was performed and post-space prepared to receive the prefabricated post. Cementation of the posts was carried out using zinc phosphate cement and silver glass ionomer cement. Light cured composite, self curing composite and silver glass ionomer cement were used as cores materials. The specimens were examined under a scanning electron microscope. These new prefabricated posts luted with silver glass ionomer cement presented a gap at the dentin-cement and post interface similar to the cast posts luted with zinc-phosphate cement. The core material was in all the three different types of construction well adapted to the post head.

Cermet Cements↗
PubMed1986

A hepatitis B vaccination programme in a group of dental practitioners.

A questionnaire concerning the acceptance of hepatitis B vaccination was mailed in April 1985 to 626 private dentists practicing in Milano and its county. Two hundred and twenty eight dentists (36.4%) filled out the questionnaire, 166 of them indicating their willingness to receive the vaccine. Between October 1985 and February 1986 we tested 241 practitioners for HBs antigen, anti-HBs and anti-HBc antibody, and SGPT (ALT) enzyme level. A 14.9% prevalence of HBV markers was found in the prevaccination testing. All persons with positivity for anti-HBs or HBsAg or with elevations of SGPT were excluded from the study (the latter temporarily). A few (42 or 20.9%) left spontaneously before the first dose of vaccine was administered. On the whole, 159 participants began the vaccination course. The proportion of vaccine recipients in dentists who indicated in the questionnaire their willingness to accept the vaccine and/or participated in a seroepidemiological survey performed in 1983 by some of us (85.1%) was significantly greater than that in the group of dentists who did neither (65.0%) (p less than 0.01). Educational effort appeared to be important to enroll and to counsel practitioners in implementing vaccination programme.

Adult↗