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Biomedical subjects

D T Fang

Publications and source records attributed to D T Fang.

11 recordsLinked to original sources
PubMed2000

Clinical evaluation of polyacid-modified resin composite posterior restorations: one-year results.

OBJECTIVE: The aim of this investigation was to evaluate the clinical performance of a new compomer restorative system, Dyract AP, placed in combination with Non-Rinse Conditioner and Prime & Bond NT in permanent posterior teeth. METHOD AND MATERIALS: Fifty Class II and 41 Class I restorations were placed in 39 patients by 1 dentist. The restorations were evaluated directly, with modified US Public Health Service criteria, and indirectly, with color slides and polyvinyl siloxane impressions, at baseline and 6 months and 1 year after placement. Preoperative and 1-year postoperative bitewing radiographs were also taken. RESULTS: All 82 restorations available for 1-year evaluation were in situ. No postoperative sensitivity or pulpal problems were reported. Four Class II restorations (4.9%) failed because of partial fracture or recurrent caries. The percentages of Alfa score for each criterion were color match, 95.1%; marginal discoloration, 57.3%; marginal integrity, 35.4%; anatomic form, 98.8%; and surface texture, 91.5%. The average wear rate of Dyract AP was low (18.5 +/- 11.7 microns at 6 months and 35.7 +/- 13.6 microns at 12 months). CONCLUSION: The excellent handling characteristics, the good clinical performance, and the improved wear resistance suggest that this compomer will provide reliable direct tooth-colored restorations in stress-bearing areas.

Acid Etching, Dental↗
PubMed1999

A 2-year clinical study of two glass ionomer cements used in the atraumatic restorative treatment (ART) technique.

The purpose of the study was to evaluate, in a clinical study over 2 years, the deterioration of two glass ionomer cements used with the atraumatic restorative treatment (ART) technique or approach. Fifty-five Fuji IX and 45 ChemFil Superior restorations were placed randomly in 23 adult patients, mainly in small occlusal preparations in molar teeth. The restorations were placed in a dental hospital by one dentist using the ART technique. Photographs, radiographs and replicas were obtained at baseline and subsequent recalls. Both cements were easy to mix and place, but the radiolucency of ChemFil Superior was a disadvantage. Both cements also showed early high losses of sealant and restorative material. After 2 years, 34.5% of the sealants appeared to be completely lost, with caries recorded in 5.3% of the exposed fissures. In some instances, these small lesions may have been present, but not detected clinically, at the time of sealing. Restoration failures of 7.0% were from wear and fracture of the cements and recurrent caries. Mean cumulative wear was 83.1 microm for Fuji IX and 104.0 microm for ChemFil Superior, which was not statistically significant. The cements became darker after their placement to more closely match the restored teeth, but there were few exact matches. There was no surface staining and only minor marginal discrepancies and staining associated with the restorations. Although the short-term clinical performance of the two glass ionomer cements was reasonable, the materials require further improvements in their mechanical properties, to reduce sealant losses and wear. The cements evaluated appear suitable for restricted use only, in posterior teeth.

Adult↗
PubMed1987

Management of presacral bleeding during rectal resection.

Severe presacral bleeding is a troublesome and potentially life-threatening complication during low anterior or abdominoperineal resection. We believe that suturing or cauterization should not be used since this will perpetuate the problem of bleeding in most instances. We recommend the use of hemostatic agents plus laparotomy sponges for compression to control the bleeding. If this fails, then the metallic thumbtack can be used as described herein. It is simple and effective.

Aged↗
PubMed1984

Overlapping sphincteroplasty for acquired anal incontinence.

When defects of the anal sphincter are caused by trauma, surgical correction can be successful even in long-standing cases. At the University of Minnesota, we used overlapping sphincteroplasty in 79 patients with fecal incontinence from 1952 to 1982. There were 62 women and 17 men. Ages ranged from 17 to 68 years. Incontinence had been present from three weeks to 40 years and had been caused by childbirth, previous anorectal surgery, trauma or rectal prolapse. Following overlapping sphincteroplasty, there was one postoperative death and 13 complications. Complications included temporary difficulty in voiding, excessive bleeding, abscess formation, fecal impaction, and hematoma. Seventy-six of the 78 surviving patients were followed for an average of 35 months. Results ranged from excellent to poor with only one failure. From our experience it was concluded that several factors were important for good surgical results. 1) The patient must have intact neuromuscular bundle with detectable voluntary sphincter contraction. 2) If a primary repair has failed, a minimum duration of three months should elapse before overlapping sphincteroplasty is attempted. 3) Scar tissue from the severed muscles should not be excised. 4) The internal and external sphincter muscles should not be separated. 5) A temporary concomitant colostomy is not necessary.

Adolescent↗
PubMed1984

Piecemeal snare excision of large sessile colon and rectal polyps: is it adequate?

This study analyzes 28 consecutive patients with large sessile polyps snared piecemeal from the colon and rectum. The sections were examined to determine the adequacy of orientation and margin of excision. Orientation was judged excellent in five, good in 12, fair in six, and poor in five cases. The margin of excision was judged adequate in 23 of 28 cases. Five of eight patients with invasive carcinoma underwent bowel resection, and no residual tumor was found in the resected specimens. Of the remaining 20 patients without carcinoma, five had residual tumor or recurrences, with follow-up from 6 months to 6 years (average, 18 months). All of them underwent rebiopsies and electrocoagulation. None of the residual tumor or recurrences showed evidence of malignancy. Piecemeal snare excision of large sessile polyps of the large bowel appears to be an adequate procedure for most patients. A close follow-up with colonoscopy or proctoscopy is essential because residual tumor or recurrences are common.

Colonic Polyps↗
PubMed1983

The shape of the buttocks. A useful guide for selection of anesthesia and patient position in anorectal surgery.

Recognition of the different shapes of the buttocks will help surgeons to appropriately select patients for anorectal surgery. Basically, there are three types of buttocks. In Type A, the mounds of the buttock make a low and gentle slope with the anal verge. In Type B, the mounds of the buttock are high and rise almost straight up from the anal verge. In Type C, the anus is located more anteriorly than normally. Patients with Type A buttocks are ideal candidates to use local anesthesia for hemorrhoidectomy and lateral internal sphincterotomy because it is easy to infiltrate the anesthetic agent into the anal canal. With Type C, this is somewhat more difficult, but no significant problem exists. For Type B buttocks, general or spinal anesthesia is recommended. For Types A and C buttocks, a lithotomy position will give an excellent exposure of the anorectal lumen for stripping the mucosa and submucosa. For Type B buttocks, a prone jack-knife position gives the best exposure.

Anal Canal↗
PubMed1983

Restorative proctocolectomy with ileal reservoir and ileoanal anastomosis.

An initial experience with a technique of restorative proctocolectomy utilizing a rectal mucosectomy, total colectomy, and ileal reservoir (Parks S-pouch) with ileoanal anastomosis for patients with ulcerative colitis and familial polyposis is presented. Although there were no deaths, significant morbidity did occur and was attributed to the use of a temporary loop ileostomy which may not be necessary. Early functional results are promising and to date, patient satisfaction is very high.

Adolescent↗
PubMed1983

A technique for perineal rectosigmoidectomy using autosuture devices.

A perineal rectosigmoidectomy can be performed safely in the elderly poor risk patient with procidentia. An excellent anastomosis can be obtained using an intraluminal stapler or end to end anastomosis autosuture device. This technique can also be used for performing the perineal anastomosis in a colonic pull-through surgical procedure.

Aged↗
PubMed1982

Colonoscopic decompression of acute pseudo-obstruction of the colon.

The recent advances in technology have made it possible to decompress acute pseudo-obstruction of the colon with colonoscope instead of celiotomy and cecostomy. Twenty-two patients who developed acute pseudo-obstruction of the colon and underwent colonoscopy were analyzed. The authors were successful in completely or partially decompressing the dilated colon in 19 of 22 patients. There were no complications. Acute pseudo-obstruction of the colon is usually secondary to intra- or extra-abdominal insult resulting in direct or reflex derangement of the sacral parasympathetic outflow. This causes a functional obstruction of the left colon. The goal of management is to prevent colonic perforation while treating the primary problems. Once the diagnosis has been made, colonoscopy should be attempted. Celiotomy should be reserved to cases in which colonoscopy is unsuccessful or in cases with perforation or impending perforation.

Adult↗
PubMedDate not supplied

In vitro effectiveness of hand excavation of caries with the ART technique. Atraumatic restorative treatment.

The purpose of this study was to evaluate the effectiveness of the atraumatic restorative treatment (ART) hand-instruments and of round steel burs for removing caries at the enamel-dentine junction (EDJ) in occlusal cavities prepared in 50 extracted permanent molars. The teeth were divided randomly into two equal groups for the two treatments provided by 1 operator. Stained but hard dentine was not removed. The teeth were then sectioned vertically, buccolingually through the prepared cavities to give 200 sections, each 500 microm thick, which were photographed (x1 magnification) before and after staining with a caries detector dye. Assessments were made (x3 magnification) of (a) the amount of brown-stained residual dentine, and (b) the amount of red dye-stained dentine present at the EDJ, using two sets of standards devised and transparencies arranged as six-category incremental rating scales. There was no statistically significant difference found between the two caries-removal methods for the amount of residual brown-stained dentine present (chi(2 )= 3. 394, p = 0.64), but there was for the amount of red dye-stained dentine present (chi(2) = 32.137, p<0.0001), although 57% of the ART and 80% of the steel bur sections had very little to mild red-dye staining present. Excavation of caries at the DJE appeared to be less effective with the ART technique, although the clinical implications of this may not be significant.

Dental Caries↗