F ollowing tooth extraction, the fundic part of the bony socket fills in with connective tissue and bone, while the alveolar crest resorbs. After the wound heals and is covered with epithelium, the edentulous ridge remains.l-lo An important question is whether the center of the resulting residual ridge lies over the center of the original dentulous ridge or has shifted towards the original lingual or labial plate. This question is important to the prosthodontist who asks whether the artificial tooth should be placed over the center of the edentulous ridge or whether the artificial tooth should be placed more to the buccal or the lingual side of it in order to occupy more accurately the position of the natural tooth. On the basis of observations of dry skull specimens, Cryer’l stated that the edentulous lower jaw lies external to and is wider than the upper jaw after all teeth have been extracted. Rogers and Applebaum12 concluded from measurements made in cadavers with dentulous and edentulous jaws that in the maxillae the vertical height of the ridges had decreased, and the crest of the edentulous ridge had shifted palatally after tooth extraction. They felt that in the mandible the most extensive resorption of alveolar bone occurred on the superior surface of the ridge and on the lingual surface of at least the posterior part of the ridge. Thus they suggested that resorption of the labial plate in the maxillae results in a loss of edentulous arch length and width, while, in the mandible, resorption of the lingual plate increases the mandibular arch length and width so that the edentulous maxillary arch comes to lie within the edentulous mandibular arch. Tylman and Tylman13 wrote that, in the maxillae, the labial and buccal alveolar plates resorb much faster than the palatal plates, while, in the mandible, the amounts of bone resorbed at the lingual and labial plates are approximately the same. Swenson14 stated that after tooth extraction the alveolar process of the

Alveolar ridge resorption following tooth extraction

Histopathologic reaction of bone to surgical cutting.

SYNOPSIS IN INTERLINGUARESPONSA HISTOLOGIC DE OSSO AL SECTION AGE PER INSTRUMENTOS ROTATORI DE ALTE VELOCITATE.—Con le utilisation de fluorescentia inducite per tetracyclina, le guarition de defectos ossee in crestas mandibulo- e maxillo-alveolari, in le margine inferior del mandibula, e in le femores de canes esseva studiate comparativemente post le production del defectos per fresas in rotation a velocitates de 200.000 rpm e, in le mesme animales, post lor production per fresas in rotation a velocitates de 5.000 rpm. Le marcage con tetracyclina revelava osso nove in omne le defectos 14 dies post le operation. Quaranta-duo dies post le operation nulle differentias quantitative o qualitative esseva observabile in le natura del responsa reparatori inter le defectos effectuate a basse e a alte rapiditates.

Histologic Response of Bone to Sectioning by High-Speed Rotary Instruments

At 10-year recall, alveolar ridge topography was compared by three different methods in 36 patients whose complete dentures were fabricated by two different techniques. In general, if alveolar ridge change was observed, it was evidenced by a reduction in size following denture wearing. Group II patients appeared to have slightly less ridge change in the subjective and ridge width evaluations, but group I patients showed slightly less ridge change in the contourator tracing measurements. Since alveolar ridge topography is influenced by many variables, it would be a mistake to claim that either denture technique was proven superior by this research effort. Overall, the alveolar ridge changes were so small that they were statistically insignificant for this sample size. Some possible factors that might explain the minimal alveolar ridge changes seen in this study are (1) conscientious application of sound basic prosthodontic principles by the dentists who constructed the dentures initially, (2) periodic recall appointments for all of the patients, and (3) the fact that all of the patients were relatively young, experienced denture wearers who had been edentulous for at least 1 year before these tested dentures were placed.

Patient response to variations in complete denture technique. Part IV: Residual ridge resorption--cast evaluation.

Early reaction in bone following the use of burs rotating at conventional and ultra speeds; a comparison study.

Abstract : A clinical evaluation of the higher bur speed technic (air turbine) in the removal of impacted teeth was carried out on 100 mandibular third molar cases. Body fluid 17-hydroxycorticosteroid determinations were utilized as an objective measurement of patient response to stress induced by the two oral surgery technics. Findings indicated that, except for patient preference, neither procedure could be considered as the method of choice. The response of the patients to the two methods was virtually identical as indicated by both subjective and objective measurements. (Author)

Air turbine in impacted third molar surgery.

: A clinical evaluation of the higher bur speed technic (air turbine) in the removal of impacted teeth was carried out on 100 mandibular third molar cases. Body fluid 17-hydroxycorticosteroid determinations were utilized as an objective measurement of patient response to stress induced by the two oral surgery technics. Findings indicated that, except for patient preference, neither procedure could be considered as the method of choice. The response of the patients to the two methods was virtually identical as indicated by both subjective and objective measurements. (Author)

The air turbine in impacted third molar surgery.

Significant modifications in the SAM contourator, model A, allow for greater ease and rapidity in recording topographic contours of the residual ridge mucosa. A description of these improvements has been presented. A statistical analysis of the combined contourator-planimeter error revealed that the error is area dependent, varying from 1.32 per cent for an area of 62 sq. mm. to 0.40 per cent for an area of 252 sq. mm. The rate at which topographic changes of the maxillary residual ridges occurred after extraction of the first molar tooth was reported for 2 subjects.

SAM contourator, model B: An instrument for measuring changes of surface contours

: The SAM Contourator is an instrument developed to record topographic changes of the residual ridges after tooth extraction and to reveal dimensional behavior of ntal a erials. Model B, a modification of model A, reduced the procedural requirem nt of the instrument by allowing for easier and more rapid recording. T pantographic apparatus magnifies the area under study. The contour arm of the machine an t e rticul or r or fle ible and permit easier approach by the operator. (Author)

Sam contourator, model b-an instrument for measuring changes of surface contours

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Air turbine in impacted third molar surgery.

The air turbine in impacted third molar surgery.

SAM contourator, model B: An instrument for measuring changes of surface contours

Sam contourator, model b-an instrument for measuring changes of surface contours