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Biomedical subjects

C F Cao

Publications and source records attributed to C F Cao.

11 recordsLinked to original sources
PubMed1994

[Longitudinal study on periodontal disease activity in treated periodontitis patients].

The aim of this study was to estimate the incidence of periodontal disease activity (PDA) in treated periodontitis patients in a longitudinal survey. Seven periodontitis patients with 170 teeth (970 sites) participated in this 6 to 12 month study. After initial therapy, the clinical parameters including attachment level (AL) were recorded as the baseline data and then repeated every two months. Occlusal stents were used for each patient to assure the accuracy and reproductivity of the attachment level measurements. Detection of > or = 2 mm of new AL between two consecutive visits was required to designate a site as PDA. During the study period, 21 sites out of 970 sites showed PDA. For better accuracy, we calculated the yearly PDA rate based on the 6-month data because not all the seven patients finished the 12-month observation. The estimated PDA rate per year was 2.8%. Data also showed that maxillary bicuspids and molars on both jaws were more susceptible to PDA. Interproximal sites and sites with > or = 6 mm pockets before treatment showed significantly greater PDA rate than buccal (lingual) sites and sites with < or = 4 mm initial pocket depth. Our data supports the tooth specific and site specific concept in periodontal disease.

Adult↗
PubMed1993

[Evaluation of relation between signs of trauma from occlusion and severity of periodontitis].

The aim of the present study was to evaluate the various occlusal interferences, signs of trauma from occlusion and their relations to severity of periodontitis. 32 cases of moderate to advanced adult periodontitis patients participated in the study with a mean age of 37.6 years. All subjects received a complete periodontal examination and occlusal analysis. The results indicated that teeth with various occlusal interferences did not exhibit any greater severity of periodontitis than those without interferences. However, widened periodontal ligament space (PDLS) was frequently seen in teeth with occlusal interference. Two combined criteria were initially suggested to identify the occlusal trauma in clinic. The first criterion included presence of functional tooth mobility plus radiographically widened PDLS. The second, presence of significant tooth wear plus radiographically thickened lamina dura. The results showed that teeth with the first criteria had deeper probing depth, more clinical attachment loss and less alveolar bone support than teeth without these findings. However, teeth with the second criteria had less attachment loss and more bone support than teeth from control group. It was suggested that both of the combined criteria provide better reliability in determination of established occlusal trauma as well as evaluation of adaptive capacity of periodontal structure to increased biting force. The regression analysis demonstrated that given equal clinical attachment levels and similar inflammation, teeth with evidences of functional mobility and widened PDLS had less osseous support than teeth without these findings (P < 0.01). The difference became greater in line with the more loss of clinical attachment.

Adult↗
PubMed1992

Clinical diagnosis of trauma from occlusion and its relation with severity of periodontitis.

The purpose of the present study was to determine the reliability of several selected signs of trauma from occlusion and their relations with severity of periodontitis. 32 moderate to advanced chronic periodontitis patients participated in the study. All teeth present were evaluated for various abnormal occlusal contacts, signs of trauma from occlusion, and the severity of periodontitis. Standardized periapical radiographs were also taken for each tooth. The results demonstrated that: (1) no significant difference occurred in probing pocket depth (PD), clinical attachment loss (AL), or percentage of alveolar bone height (BH) between teeth with and without various abnormal occlusal contacts, i.e., premature contacts in centric relation occlusion, non-working contacts in lateral excursions, premature contacts of anterior teeth or posterior protrusive tooth contacts; (2) teeth with either significant mobility, functional mobility, or radiographically widened periodontal ligament space (PDLS) had deeper PD, more AL and lower BH than teeth without these signs, while teeth with pronounced wear or radiographically thickened lamina dura had less AL than teeth without these findings; (3) 2 combined indices, i.e., the trauma from occlusion index (TOI) and the adaptability index (AI), were proposed for the identification of occlusal trauma and the response of periodontium to excessive biting forces in heavy function, respectively; TOI-positive teeth exhibit deeper PD, more AL and less osseous support than TOI-negative teeth; however, AI-positive teeth had less AL and more osseous support than AI-negative teeth; (4) with identical attachment level, TOI-positive teeth had less osseous support than TOI-negative teeth while the magnitude of difference became greater with an increase of attachment loss.

Adult↗
PubMed1990

Comparison of plaque microflora between Chinese and Caucasian population groups.

This investigation was designed to compare the predominant plaque micro-organisms from a Chinese group of patients exhibiting periodontitis with an age-, sex- and periodontal disease-matched Caucasian group of patients. In addition to race, the 2 population groups differed with respect to diet and oral hygiene habits, or effectiveness at removing plaque. Clinical measurements were determined along with an evaluation for micro-organisms in supragingival and subgingival plaque. Although the Chinese and Caucasian population groups were similar with respect to composition of micro-organisms in subgingival plaque, notable differences were observed in supragingival plaque. The Chinese group had higher mean proportions of spirochetes, motile rods. Fusobacterium spp. and dark-pigmented Bacteroides species, while the Caucasian group had higher mean proportions of cocci, total Actinomyces spp., A. viscosus and total Streptococcus spp. in supragingival plaque. The microbial differences observed in supragingival plaque may be explained at least in part, if not totally, by the higher plaque index scores of the Chinese versus Caucasian population groups.

Actinobacillus↗
PubMed1990

[Relationship between serum antibody to Bacteroides gingivalis and clinical parameters in periodontitis patients].

Prevalence and proportion of black-pigmented Bacteroides species (BPB) in supragingival and subgingival plaque were determined in ten adult periodontitis patients. Serum antibody against Bacteroides gingivalis (Bg) of these patients were tested using ELISA. Clinical parameters (PI, GI, PD, AL) were collected prior to blood withdrawn. Results showed that BPB were detected in all patients. Mean serum anti-Bg IgG level was significantly greater in the patient group than that in healthy control group. Although the sample size was too small to show statistical difference, there was a trend showing the sera anti-Bg IgG level tended to be greater in accordance with the increase of disease severity and BPB%.

Adult↗
PubMed1989

Crevicular fluid myeloperoxidase at healthy, gingivitis and periodontitis sites.

The volume and myeloperoxidase (MPO) activity of gingival crevicular fluid (GCF) collected with filter paper strips for 30 s from the sulcus of healthy, gingivitis and periodontitis sites of Chinese subjects were measured. MPO/site and MPO/microliter GCF were both greater at gingivitis and periodontitis sites than at healthy sites. Enzyme activity was similar at the 2 categories of diseased sites. Mean GCF volume and MPO activity were calculated for all samples from healthy, gingivitis and periodontitis sites with GI 0, 1, 2 and 0 + 1. GCF volume, MPO/site and MPO/microliter GCF all were greater at GI 2 than GI 0 or 0 + 1. These data indicate that increased GCF MPO previously observed at periodontitis sites is not specific to such sites. Rather increased GCF MPO likely occurs when additional polymorphonuclear leukocytes enter the sulcus as a result of gingival inflammation. A second sample was obtained from 22 sites 4 weeks after the initial collection. These samples were collected for 5 s rather than 30 s. The GCF volume, MPO/site and MPO/microliters GCF were each greater in samples collected for 30 s rather than 5 s. Correlation coefficients showed that the amount of GCF and MPO activity of the fluid collected for 5 s and 30 s was dependent upon the site even though the 5-s and 30-s samples were collected 4 weeks apart.

Adult↗
PubMed1989

[Crevicular fluid myeloperoxidase and periodontitis disease].

The volume and myeloperoxidase (MPO) activity of gingival crevicular fluid (GCF) collected with filter paper strips for 30 sec from the sulcus of healthy, gingivitis and periodontitis sites of Chinese subjects were measured. MPO/site and MPO/microliter GCF were both greater at gingivitis and periodontitis sites than healthy sites. Enzyme activity was similar at the 2 categories of diseased sites. Mean GCF volume and MPO activity of the samples were calculated for all sites with GI 0, 1, 2 and 0 + 1 irrespective of experimental group assignment. GCF volume MPO/site and MPO/microliter GCF all were greater at GI 2 than GI 0 or 0 + 1. These data indicate that increased GCF MPO previously observed at periodontitis sites is not specific to these sites. Rather, increased GCF MPO likely occurs when additional polymorphonuclear leukocytes enter the sulcus as a result of gingival inflammation. A second sample was obtained from 22 sites 4 weeks after the initial collection. These samples were collected for 5 rather than 30 sec. The GCF volume, MPO/site and MPO/microliter GCF each were greater in samples collected for 30 rather than 5 sec. Correlation coefficients showed that the amount of GCF and MPO activity of the fluid collected for 5 and 30 sec was dependent upon the site even though the samples were collected at different times.

Adult↗