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C Clauser

Publications and source records attributed to C Clauser.

At least 37 records · Page 2Linked to original sources
PubMed1993

Guided tissue regeneration and a free gingival graft for the management of buccal recession: a case report.

Five patients with buccal gingival recession (4 to 6 mm) underwent surgical treatment consisting of a guided tissue regeneration procedure associated with a free gingival graft. The graft was used to cover the newly formed tissue on the root surface at the reentry. Root coverage was complete in three patients, while 1 mm of recession remained in the other two patients. The free gingival graft reconstructed the keratinized tissue, which had been lost because of recession. Moreover, it allowed the mucogingival junction, which had been displaced coronally during the first surgery, to be realigned, therefore preventing a shallowing of the vestibule.

Adult↗
PubMed1992

Fibrinolytic activity of human gingiva in the presence or absence of plaque bacteria.

Activators of fibrinolysis are found in the gingival connective tissue and in the sulcular epithelium. The influence of plaque bacteria and the related inflammatory reaction on the fibrinolytic activity has been evaluated in the human gingiva. An autohistographic technique was applied to sections taken from three groups of 6 specimens each: group A from clinically healthy sites with plaque index = 1 and no bleeding on probing; group B from areas with unambiguous visual signs of gingivitis, with plaque index = 2-3 and bleeding on probing; group C from sites previously treated with professional toothcleaning twice a week for 3 months and with chlorhexidine mouthrinses twice a day for the final 3 wk, in order to obtain a virtually complete elimination of the plaque bacteria. In group C the plaque index was 0 and there was no bleeding on probing. Connective tissue fibrinolytic activity was present in all the sections from the three groups. The sulcular fibrinolytic activity was observed in all the sections taken from the specimens of groups A and B. In contrast, no fibrinolytic activity was observed over the sulcular area in any section taken from the specimens of group C. Therefore, this study does not support previous claims that healthy sulcular epithelium is capable of releasing activators of fibrinolysis. It can be concluded that the presence of any amount of plaque bacteria is associated with sulcular fibrinolytic activity. Contrarily, the elimination of plaque bacteria is associated with the absence of any detectable sign of fibrinolytic activity in the gingival sulcus.

Connective Tissue↗
PubMed1992

Guided tissue regeneration versus mucogingival surgery in the treatment of human buccal gingival recession.

A surgical technique involving membranes was used to treat localized human buccal recessions 3 mm to 8 mm. The results on 25 patients (test group) were evaluated 18 months postoperatively and compared with the results obtained in 25 other patients (control group) having undergone mucogingival surgery. In the test group, a trapezoidal flap with a large base was raised beyond the mucogingival junction. The exposed root surface was scaled thoroughly to a concave shape. A membrane was bent and adapted onto the concave root surface. The flap was sutured far coronally and the membrane removed one month later. The control patients underwent a 2-step procedure, consisting of a free gingival graft and a coronally positioned flap. The amount of root coverage obtained was similar in the 2 groups (test = 72.73%; control = 70.87%), although the clinical attachment gain (test = 5.12 mm; control = 3.56 mm) and pocket variation (test = 1 mm reduction; control = 0.06 mm increase) differed significantly (P < 0.001). The keratinized tissue width was greater in the control group. The regression analysis showed that the amount of covered root surface after treatment was in strict correlation with the depth of the original recession in the test group, while no correlation was found in the control group. The expected root coverage was greater in the test group when the recession was greater than 4.98 mm, while it was greater in the control group when the recession was less than 4.98 mm. These results indicate that a guided tissue regeneration procedure can be used to successfully treat recession. The membrane procedure compared favorably with the mucogingival surgery in the treatment of deep recession.

Adolescent↗
PubMed1992

Guided tissue regeneration in the treatment of human facial recession. A 12-case report.

A guided tissue regeneration procedure was used to treat human buccal recessions, 3 to 7 mm deep, in 12 patients. No procedure for increasing the width of keratinized tissue was performed prior to treatment. A thick bipedicled flap was raised with a semilunar incision in the alveolar mucosa and a marginal incision was extended to the adjacent papilla. The root surface was made concave by curets and burs to create space for regeneration. The membrane was fixed to the cemento-enamel junction and covered by the flap which consisted of the residual gingiva and of alveolar mucosa. The membranes were removed 4 weeks after placement. The patients were recalled 6 months after the reentry procedure. The average reduction in recession was 2.50 mm (P less than 0.01) and the average attachment gain was 2.84 (P less than 0.01). Pocket depth was slightly reduced (0.33 mm), although the degree of reduction was not of statistical significance. The width of keratinized tissue increased slightly (0.83 mm). These results demonstrate the possibility of treating human buccal recessions by means of a guided tissue regeneration procedure, with predictable recession reduction and attachment gain. A minimal amount of keratinized tissue was needed.

Adult↗
PubMed1992

Periodontal regenerative therapy with coverage of previously restored root surfaces: case reports.

Two case reports are presented to demonstrate a treatment that restores proper esthetics, cures hypersensitivity, and enhances periodontal support for cases of root caries or failing Class V restorations associated with gingival recessions. The procedure involves removing the existing restoration, elevating a trapezium-shaped full thickness flap, root planing to achieve a desired concave shape, and placing a barrier membrane. In both cases, satisfying clinical results have been maintained for 18 months.

Adult↗
PubMed1989

Effects of exposure time and pulse parameters on CO2 laser osteotomies.

Two sets of experimental linear osteotomies were performed on frozen cortical bone by means of a high-power industrial CO2 laser in the rapid superpulsed mode, varying the velocity of the operating table, the mean power of the laser beam, the pulsewidth, the pulse repetition rate, and the peak power. Both the depth and the width of the osteotomies were inversely related to the velocity and directly related to the mean power and to the pulsewidth, but they were not affected by changes in the repetition rate. The depth/width ratio, which describes the profile of the osteotomies, was affected by the mean power only. These data permit greater accuracy in the planning of laser osteotomies in cortical bone when using the rapid super-pulsed mode.

Animals↗
PubMed1989

Laser dentistry: a new application of excimer laser in root canal therapy.

We report the first study of the application of excimer lasers in dentistry for the treatment of dental root canals. High-energy ultraviolet (UV) radiation emitted by an XeCl excimer laser (308 nm) and delivered through suitable optical fibers can be used to remove residual organic tissue from the canals. To this aim, UV ablation thresholds of dental tissues have been measured, showing a preferential etching of infiltrated dentin in respect to healthy dentin, at laser fluences of 0.5-1.5 J/cm2. This technique has been tested on extracted tooth samples, simulating a clinical procedure. Fibers of decreasing core diameters have been used to treat different sections of the root canal down to its apical portion, resulting in an effective, easy, and fast cleaning action. Possible advantages of excimer laser clinical applications in respect to usual procedures are also discussed.

Fiber Optic Technology↗
PubMed1989

Laser dentistry: root canal diagnostic technique based on ultraviolet-induced fluorescence spectroscopy.

A diagnostic technique to detect residual tissues at different levels of the root canal during an endodontic treatment is presented. The diagnostic system is based on ultraviolet-induced fluorescence spectroscopy and uses suitable optical fibers for local delivery of excitation light and to collect back fluorescence spectra. Spectra of root canal tissues have been obtained from split teeth by labeling with a fluorescent solution. Residual tissue can be discriminated in respect to healthy dentin because of their different spectral responses: the spectral shape of the first response shows a clear peak at 530 nm because of a selective absorption of the fluorescent dye, whereas for the second response, the spectral curve monotonically increases toward ultraviolet wave-lengths with no particular structure. This technique has been tested on unsplit teeth simulating operative conditions. A compact spectroscopic system has been devised that can be easily integrated in an excimer laser system to perform residual tissue detection during laser cleaning of the canals.

Fiber Optic Technology↗
PubMed1988

Fibrin and fibronectin sealing system in a guided tissue regeneration procedure. A case report.

A case is reported showing an iatrogenic, chronic abscess of six years' duration associated with a bony defect between the maxillary right central and lateral incisors. The osseous defect was treated by a guided tissue regeneration procedure with the use of a fibrin and fibronectin sealing system. The system was employed to fix the membranes and keep them apart from the root surface, thereby maintaining room for bone regeneration. This operation resulted in a 9-mm clinical attachment gain and in an 11-mm filling of the osseous defect. The second surgical stage after a three-month reentry procedure was strictly for cosmetic improvement by means of a free gingival graft.

Adolescent↗
PubMed1987

Human fibrin glue versus sutures in periodontal surgery.

A fibrin-sealing system consisting of symmetrical flap and graft procedures versus silk sutures in a split-mouth clinical trial was tested in 51 patients. Clinical parameters and operative times were recorded and compared. In clinical use, the fibrin glue provided quick hemostasis and adequate tissue adhesion on the whole inner surface of grafts or flaps. Its use saved remarkable amounts of time and made it easier to fix tissues in difficult areas. The time saved ranged from 3 to 19.5 minutes per procedure, and 1 to 8.5 minutes per tooth. The convenience of the fibrin glue was especially appreciated in pedicle flap procedures.

Adolescent↗