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At least 613 records · Page 34Linked to original sources
PubMed1995

Multiple species of defective RNAs in plants infected with citrus tristeza virus.

Alemow (Citrus macrophylla) and sweet orange (C. sinensis) plants infected, respectively, with several Israeli and Florida isolates of the citrus tristeza virus (CTV) were found to contain multiple species of RNA molecules with features similar to defective-interfering RNAs. Northern blot hybridizations of dsRNAs extracted from serial passages of the Israeli VT isolate (CTV-VT) and from different plants infected with a single source of inoculum showed considerable variation both in the presence and in the relative abundance of the defective RNA (D-RNA) bands. The D-RNA molecules were found to be encapsidated in the CTV particles. Sequence analysis of two VT D-RNA molecules of 2.7 and 4.5 kb revealed that they were composed of two regions corresponding to 1818 and 4036 nucleotides from the 5' and 938 and 442 nucleotides from the 3' termini of the CTV-VT genomic RNA, respectively. A short (ca. 0.8 kb) nonencapsidated single-stranded positive-sense RNA species was also found in infected plants. This ssRNA, which copurified with dsRNAs, was shown by hybridization to encompass the 5'-terminal part of the CTV genome and might have an extensive secondary structure.

Base Sequence↗
PubMed1991

[The stability of orthodontic treatment results].

A posttreatment evaluation of 72 patients, who are approximately 5.8 years out of retention, showed only little changes between the last appointment and the follow-up examination. The results can be considered stable. The statistic analysis indicated a correlation among some changes, which are important for treatment and therapy planning. For the stability in transversal and sagittal direction a maximal intercuspidation of the premolars and molars is as important as the exact positioning of the canines with lateral contacts in the dental arch. Transversal over-expansion should be avoided, because those results cannot be stabilized in the postretention period. The functional adaptation of muscles, the abolishment of habits and the duration of retention are essential preconditions for a stable treatment result.

Adolescent↗
PubMed1976

Preorthodontic guidance and the corrective mixed-dentition treatment concept.

A concept of corrective orthodontic treatment starting at an earlier age than usual has been discussed and illustrated. Realignment of terminology has been prosposed to give a clearer picture of the circumstance of malocclusion and its need for correction at an early age. A group of 300 patients treated in three categories were compared as to length of treatment time. Three groups of twenty-five patients treated correctively after preorthodontic guidance in the mixed dentition and only in permanent dentition were analyzed cephalometrically. The following conclusions can be reached: 1. Corective mixed-detition orthodontic treatment is a valid, safe, and reliable peocedure. 2. It encompasses both preorthodontic guidance and full-banded orthodontic treatment. 3. Current terminology is confusing and controversial...

Attitude of Health Personnel↗
PubMed1977

Treatment of anterior skeletal open-bite deformity.

Two patients with severe skeletal anterior open-bite have been presented. Treatment of these patients was accomplished mainly by mandibular repositioning (Case 1 by orthodontic means and Case 2 by a combination of surgery and orthodontics) and by an orthodontic change in the mandibular occlusal plane. A review and a discussion of the cause of this deformity were presented.

Adolescent↗
PubMed1978

Surgical-orthodontic correction of vertical maxillary excess.

Superior repositioning of the maxilla via maxillary ostectomy has proved to be useful method of treating patients with vertical maxillary excess. It is indicated primarily in patients with lip incompetence, excessive exposure of maxillary anterior teeth, long lower facial height, contour-deficient chin, and either Class I or Class II malocclusion. We have used this procedure as routine treatment for vertical maxillary excess over the past 5 years. Timing of the surgery is not so important in non-open-bite patients, and the procedure can be done with equal success before any orthodontic intervention, during orthodontic treatment, and following all orthodontic procedures. Timing is primarily dependent upon the orthodontist's desires. Since the surgery can produce a much simpler orthodontic problem, thus reducing treatment time and allowing a better over-all result, we recommend that it be done as early in treatment as possible. Clinically, the over-all improvement in facial appearance and the predictability and stability of the results have made this a most versatile and effective procedure when carried out with good planning, proper execution and attention to detail.

Adolescent↗
PubMed1980

Dimensional changes in the dental arches of orthodontically treated cases.

Integrated data from lateral cephalometric radiographs and study models of fifty-three patients were studied to assess the interactions between dimensional changes occurring during orthodontic treatment and the postretention stability of these changes. A new technique was developed to study distal movement of canines. Distal movement of canines did not ensure a stable increase in intercanine width. There was no significant relationship between mesiodistal position of the first molars and changes in intermolar width. Eruption of the first molar in the postretention period was associated with greater stability in overbite. There was no great degree of correlation between depth of the curve of Spee and inclination of the occlusal plane or between changes in arch length and changes in inclinations of the incisors.

Cephalometry↗