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Biomedical subjects

W Mörmann

Publications and source records attributed to W Mörmann.

At least 19 recordsLinked to original sources
PubMed1992

Computer-designed inlays after 5 years in situ: clinical performance and scanning electron microscopic evaluation.

Eight mesio-occlusodistal adhesive inlays, fabricated from ceramic blocks using a computer-aided design/machining method, were reexamined after 5 years of clinical service. The inlays wre evaluated according to modified US Public Health Service criteria. The results indicated excellent clinical performance, with eight Alfa ratings for wear, recurrent caries, and color match, and five Alfa and three Bravo for marginal discoloration and marginal integrity. Under scanning electron microscope, 81.0% of the tooth-cement interfaces and 84.1% of the cement-inlay interfaces were rated continuous at the occlusal margin. Axially, 73.6% of the tooth-cement interfaces and 87.0% of the cement-inlay interfaces were rated continuous. Although this long-term investigation revealed good clinical performance of the inlays, improvements in the ceramic structure and its properties, the cavosurface design, and the luting composite resin were recently introduced to further optimize quality.

Ceramics↗
PubMed1982

Plaque control with chlorhexidine and D-301, a quaternary ammonium compound.

Eighteen female dental hygiene students took part in a double-blind, crossover clinical trial of equimolar (2.2 mmol) rinsing solutions of D-301, a quaternary ammonium compound and chlorhexidine digluconate, Rinsings were partly supervised, test periods were 7 days (5 days without oral hygiene) with a 1-week interval. Plaque formation was significantly reduced by both test solutions versus the control; on not precleaned tooth surfaces plaque formation was equally inhibited by the chlorhexidine and D-301 mouthrinses. On precleaned surfaces D-301 significantly inhibited plaque formation compared with the control rinse, but was less effective than chlorhexidine. There was no significant change in the PBI, a measure of gingival inflammation, during any of the test period. Staining of teeth and tongue was judged as equal after chlorhexidine and D-301 use. Reports of taste and gastric disturbances were minimal but more frequent during the D-301 test period.

Benzalkonium Compounds↗
PubMed1981

The relationship between success of free gingival grafts and transplant thickness. Revascularization and shrinkage--a one year clinical study.

The purpose of this clinical investigation was to determine what effects the thickness of a free gingival graft has on the processes of revascularization and shrinkage. With the aid of a Mucotome, very thin, thin, and intermediate thickness grafts were excised from the palate. These were placed in the mandible or maxilla of patients with insufficient attached gingiva. Vertical graft shrinkage was measured at 15, 30, 90, and 360 days after surgery. Angiographic studies were made on 24 healing grafts. From the day of grafting to 360 days afterward the percentages of shrinkage were: very thin, 45%; thin, 44%; intermediate, 38%. The angiographic study demonstrated that rapid revascularization can be expected when uniform grafts of thin to intermediate thickness are placed on a periosteal recipient site which has been carefully freed of loose connective tissue and muscle attachments. An uneven, thick graft placed on a site of denuded bone favored a prolonged period of revascularization and delayed healing.

Adolescent↗
PubMed1979

Gingival blood circulation after experimental wounds in man.

Capillary blood circulation following experimental wounding was observed by fluorescein angiography. Contralateral punch wounds 1.5 mm in diameter were made in healthy mandibular labial attached gingiva of 31 volunteers. Areas of ischemia were clearly visible angiographically 6 hours after wounding and were significantly greater in area (P less than 0.05) and wider (P less than 0.01) for wounds in the long axis of mandibular incisors (N = 14) than those on the vertical midline of the gingival papillae (N = 17). The ischemic changes occurred exclusively cranial to the experimental wounds. By the third day the epithelium adjacent to the wound margin in the central part of the ischemic area had necrotized, thus extending the wound coronally. By the seventh day the axial wounds were significantly (P less than 0.001) larger than the papillary wounds. The data strongly suggest that the blood supply of mandibular labial attached gingiva is preferentially oriented in an apico-coronal direction and that the capacity for collateral circulation is dependent upon local differences in vascular structure. The findings are applicable to flap design in periodontal surgery.

Adult↗
PubMed1979

Mucogingival surgery. The subperiosteal vestibule extension. Clinical results 2 years after surgery.

A surgical technique to establish wide zones of attached mucosa was performed in 28 patients presenting with inadequate amounts of attached gingiva. The clinical results of the procedure were monitored over a period of 2 years. Biometric assessment of 112 mucogingival units immediately before and at 1, 3, 6, and 24 months after surgery revealed that the mean width of attached gingiva changed from 1.1 mm to 5.3 mm of attached tissue (gingiva plus vestibular mucosa). A surgically produced increase of 4.9 mm in width (P less than 0.001) and subsequent shrinkage of 0.7 mm or 14% (P less than 0.001) resulted in a total average gain of 4.2 mm of attached mucosa 2 years after surgery (P less than 0.001). A begin/end analysis of the coronal level of clinical periodontal attachment and the extent of gingival recession showed no clinically significant changes. The mean width of keratinized gingiva increased 0.8 mm during the 2-year postoperative period. The subperiosteal vestibule extension is recommended as an alternative to the free autogenous mucosa graft for establishing wide bands of attached mucosa in areas where loss of attached gingiva is associated with mechanical or microbial irritation of the marginal periodontium.

Adolescent↗
PubMed1979

Damaging effects of toothbrush bristle end form on gingiva.

The ability of two different toothbrush bristle ends to produce traumatic gingival abrasion was assessed in a double blind study of 15 male and 15 female young adults. Brushing was performed in a circular fashion using a modified Bass Technique. An apparatus allowing continuous visual feedback of the average brushing force permitted a degree of standardization of the system. The upper left canine and bicuspid area had to be brushed for 30 seconds with cut toothbrush bristles (CP) and with round ended toothbrush bristles (RP) respectively. A two week interval separated the two brushing sessions. Traumatic lesions of the attached gingiva were stained with a disclosing solution, photographed and evaluated planimetrically. The "cut bristles" caused gingival abrasions 30% greater in extent than the round end bristles. The difference was not due to single brushing strokes accidentally greater for the "cut bristles". The size of the lesions was not sex dependent. To prevent gingival damage it is desirable to either round the bristles in production or to rid the bristle ends at least of sharp edges.

Adolescent↗
PubMed1979

[The effect of vascular injuries on the healing of experimental gingival wounds].

Following experimental infliction of stab wounds, the blood circulation in mandibular gingiva attached to the labium was studied in 31 subjects with fluorescence angiography. Ischemic circulatory disturbances six hours after infliction of the wound and enlargement of the wound three days post operationem were all directed cranially. Blood flow in this area of the gingiva seems to have a strictly caudocranial orientation; the ability to develop collateral circulation is also limited. Ischemia was significantly increased in the stab wounds set axially over the roots of the incisors. Three and seven days later, the wound surface was considerably larger than that of papillar wounds inflicted at the same level. The attached gingiva appears to be more susceptible to injury over the roots of the lower incisors than in the neighboring papillary regions.

Adult↗