摘要:

Electron microscopicexamination of the periodontal ligament of the mouse molar at the ligament‐cementum and ligament‐bone interfaces revealed fibroblasts apparently engaged in the severing and phagocytosis of ligament collagen fibrils originally anchored to bone or cementum as “Sharpey's fibers”.

ISSN:1049-8885    

DOI:10.1902/jop.1980.51.8.429

出版商:Wiley    

年代:1980

数据来源: WILEY

摘要:

This study wasdesigned to quantitate the changes in experimental angular bony defects and the surrounding tissues following the removal of irritants associated with marginal periodontitis. Plaque retentive ligatures were placed around the mandibular second bicuspids in each of four squirrel monkeys. Ten weeks later the ligatures were removed and mechanical cleaning was implemented. At the same time, ligatures were placed on the contralateral (control) bicuspids. After 10 weeks the monkeys were sacrificed and the tissues prepared for analysis. The control tissues represented the state of the periodontium immediately prior to ligature removal and the implementation of 10 weeks of mechanical cleaning. Histometric analyses revealed a reduction from 68 to 14% in the inflammatory cell infiltrate present in the supracrestal connective tissue following ligature removal and plaque control. Concomitant with this decrease was a 50% increase (P<0.01) in the amount of bone present in the coronal periodontium. There was bone repair at the crest and along the angular defect but there was not a total regeneration of the lesion. These tissue changes were accompanied by a reduction in tooth mobility and a reformation of the gingival architecture although there was no new attachment. It appears that there is a potential for bone repair in these angular defects without an alteration in the connective tissue attachment level.

ISSN:1049-8885    

DOI:10.1902/jop.1980.51.8.433

出版商:Wiley    

年代:1980

数据来源: WILEY

摘要:

The embryologicalformation and anatomy of the rests of Malassez are described and their possible roles of health and disease are discussed. It is emphasized that the rests are worthy of new interest and further study. They comprise a structure whose precise anatomy still is in need of accurate description and in which the presence or absence of a physiological role is unproven.

ISSN:1049-8885    

DOI:10.1902/jop.1980.51.8.437

出版商:Wiley    

年代:1980

数据来源: WILEY

摘要:

Agroup of40 healthy, young adult male naval recruits were examined and scored for gingival inflammation, plaque, food impaction, pocket depth, carious lesions, calculus, restorations and overhangs. The findings of this study support those previously reported in naval recruits, i.e. gingival inflammation is widespread involving almost every area examined. Naval recruits do not adequately remove deposits of interdental plaque, and at least one pocket with a depth of 4 mm or greater is present in three out of every four recruits. Additionally, it was found that the level of gingival inflammation was considered moderate or severe in more than 80% of the areas examined. Analysis revealed no significant relationship between contact type and Gingival Index or pocket depth. However, the significant relationship observed between food impaction and contact type, and between food impaction and pocket depth, reinforced clinical observations that food impaction contributes to periodontal pathosis. A high number of restorations had mechanical retentive areas for bacterial plaque accumulations. Thus, in addition to establishing adequate levels of interproximal surface plaque removal by the patient, the clinician should take great care in finishing the gingival margins of restorations and should eliminate those factors associated with food impaction early in treatment.

ISSN:1049-8885    

DOI:10.1902/jop.1980.51.8.445

出版商:Wiley    

年代:1980

数据来源: WILEY

摘要:

This is a sequelto a previous study that showed that many molars with furcation involvement (F.I.) can survive in a state of health and can function efficiently and without pain for many years. This finding is at variance with the views of others who believe that the prognosis for teeth with F.I. is unfavorable. The conclusions of the present study are: (1) F.I. of molars was a common finding; it occurred much more frequently than anticipated. (2) F.I. occurred three times more frequently among maxillary molars than among mandibular molars. (3) Many molars with F.I. functioned well from 5 to 24 years. (4) Based on these findings, it is suggested that two aspects of molars with F.I. be reevaluated, i.e., their prognosis and treatment. Further it is suggested that therapy for these teeth be designed to improve their functional environment and that in many instances removal of root or bone or extraction of the tooth is not necessary. (5) F.I. was detected more frequently in maxillary molars by radiographic examination than by clinical examination. On the other hand F.I. was detected more frequently in mandibular molars by clinical examination than by radiographic examination.

ISSN:1049-8885    

DOI:10.1902/jop.1980.51.8.450

出版商:Wiley    

年代:1980

数据来源: WILEY

摘要:

Collagenase activitywas demonstrated by direct incubation to be present in human periodontal ligament. This activity was found in only one of two populations of ligament, i.e., those ligaments taken from teeth in which their attachment site was at least 2.5 mm apical to the cementoenamel junction. The collagenase was demonstrated to be of host origin because it degraded collagen into 3/4 and 1/4αchain fragments characteristic of mammalian collagenases. The enzyme was shown to be inhibited in the presence of EDTA and to have a pH optimum of 7.5.

ISSN:1049-8885    

DOI:10.1902/jop.1980.51.8.455

出版商:Wiley    

年代:1980

数据来源: WILEY

摘要:

Abrief surveyof the techniques of intravenous conscious‐sedation for full dentition, all inclusive periodontal surgery is presented as used for 5200 patients. Diazepam, meperidine, and methohexital were employed in 3700 cases while diazepam plus methohexital was used in the remaining 1500 cases. Local infiltration and nerve block anesthesia were employed in all of the cases. Patients of wide age range having a physical status of I, II or III underwent total periodontal surgery in one appointment. No major complications were noted. Patient and surgeon acceptance was excellent.

ISSN:1049-8885    

DOI:10.1902/jop.1980.51.8.462

出版商:Wiley    

年代:1980

数据来源: WILEY

摘要:

Amethod forperiodontal splinting of anterior teeth with wire and composite resins is described. The method combines the use of a double wire reinforcement, shallow tooth preparation, and acid etching to obtain good strength and sealing properties. The sequence of steps was exclusively designed to suit the properties of composite resins. The technique has the advantages of conservatism and simplicity, good esthetics and strength that surpasses that of conventional wire and acrylic or composite splints.

ISSN:1049-8885    

DOI:10.1902/jop.1980.51.8.465

出版商:Wiley    

年代:1980

数据来源: WILEY

摘要:

An approach ispresented for the construction of an extracoronal temporary splint that meets the demands of stabilization in the presence of a compromised attachment apparatus. It is completely reversible and esthetically acceptable. It also combines the versatility of two often used materials—orthodontic grid material (for bracket placement) and self‐polymerizing resins and composites, giving the combined effect of strength, stability and esthetics.

ISSN:1049-8885    

DOI:10.1902/jop.1980.51.8.469

出版商:Wiley    

年代:1980

数据来源: WILEY

摘要:

Forty‐six mentallyretarded epileptic patients being treated with phenytoin and phenobarbital were studied to determine the root/crown length ratios. Forty‐five mentally retarded patients not receiving anticonvulsant drugs provided the controls. Further, because serum phenytoin levels have been related to severity of gingival hyperplasia, efforts were made to determine if the hyperplasia was associated with dental root abnormalities and also whether these abnormalities could be related to epilepsy per se. Results showed that in certain teeth there was a smaller root/crown ratio in the patients taking anticonvulsant medication. The male patients were more affected than the female. The unusually short roots were not necessarily related to high serum phenytoin but the severity of gingival overgrowth was. Histologic study of teeth from patients taking anticonvulsants revealed developmental abnormalities and resorption.

ISSN:1049-8885    

DOI:10.1902/jop.1980.51.8.474

出版商:Wiley    

年代:1980

数据来源: WILEY