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ePaper created 2015-11-17, 15:11:47 | version 1.38.0
buccal and lingual/palatal aspects after tooth ex- tractionandimmediateplacementofanimplantin the extraction socket. A global volume loss of 12.7%wasobserved,being5.9%atthebuccaland 6.8%atthelingual/palatalaspects.Thedifference was not statistically significant. These outcomes differfromthosereportedon2-Dvariationsofthe alveolarprocess13 orofthebonycrest.10,11 Inthose studies, however, a single reference point was used,whilethe globalvolume ofthe ROIwas ana- lyzed in the present study. Moreover, the studies on bony crest variation did not include measure- ments ofsoft-tissue dimensions. It hasto be con- sidered that the procedure used in the present studyallowedfortheuseof2-Ddatatooregarding a single intersection point orsingle plane, andthis mayhavepermittedamorecompleteanalysis. The3-Dmethodcanbeaffectedbyvariouser- rors related to the impression, model fabrication, 3-D scanning (reverse engineering phase), mesh creation, 3-D elaboration and superimposition. Inthe present study,the dimensionalvariations betweenthetwo periods (T0 andT1) atthe con- tralateral sites were also analyzed. Small varia- tions were found, most likely due to the errors included in the method. The differences be- tween the implant sites and the contralateral sites were highly statistically significant. This, in turn, meant that these errors did not affect thedatathatthis3-Dmethodproducedandthe volume differences found were not due to the caseortoerrors,buttothebiologicalphenome- non of resorption. In the present study, a positive linear corre- lationbetweentheglobalvolumeoftheROIand the volume loss was found. This means that the largerthejaw,thelargertheresorption.Thisob- servation makes it senseless to investigate vol- ume loss with a superimposed standardized grid for analysis. In fact, in the present study, a Volume 1 | Issue 1/2015 67Journal of Oral Science & Rehabilitation Vo lu me tr i c 3- D di gi tal analysi s Table 1 2-D analysis. Mean values and standard deviations of the horizontal reduction of the buccal aspect of the alveolar process at the 42 intersection points in %. HP = Horizontal plane; VP = Vertical plane. Table 2 2-D analysis. Mean values and standard deviations of the horizontal reduction of the lingual/palatal aspect of the alveolar process at the 42 intersection points in %. HP = Horizontal plane; VP = Vertical plane. Table 3 2-D analysis. Global horizontal reduction of the alveolar process in % represented by the sum of the mean values of the buccal and lingual/palatal reduction at the 42 intersection points. HP = Horizontal plane; VP = Vertical plane. HP 0 -14.8 (7.1) -17.5 (4.6) -24.0 (24.0) -16.8 (17.8) -20.0 (15.9) -18.0 (10.5) -12.5 (5.7) HP -1 -12.7 (6.5) -15.7 (7.0) -17.6 (8.2) -15.9 (7.5) -15.7 (6.1) -12.5 (3.3) -9.5 (4.4) HP -2 -9.1 (5.6) -11.0 (5.8) -12.2 (5.1) -11.9 (4.1) -10.6 (3.4) -9.2 (3.8) -7.0 (3.6) HP -3 -6.7 (5.1) -8.1 (5.5) -8.8 (5.0) -8.9 (4.7) -8.3 (4.3) -6.7 (3.7) -5.0 (2.9) HP -4 -4.6 (4.7) -5.7 (5.3) -5.9 (5.0) -5.6 (4.4) -5.1 (3.7) -4.1 (2.9) -3.0 (2.3) HP -5 -2.6 (3.7) -3.3 (4.3) -3.6 (4.2) -3.4 (4.2) -3.1 (3.9) -2.6 (3.1) -2.0 (2.4) VP3 VP2 VP1 VP0 VP-1 VP-2 VP-3 HP 0 -9.4 (3.9) -14.7 (4.2) -19.9 (7.8) -24.1 (14.1) -20.9 (8.4) -19.7 (9.5) -17.9 (13.6) HP -1 -7.6 (5.6) -11.1 (5.6) -14.6 (9.2) -17.7 (12.7) -15.4 (10.1) -11.8 (6.6) -8.5 (4.6) HP -2 -4.1 (3.1) -6.0 (3.7) -7.6 (4.6) -8.7 (4.8) -8.1 (4.5) -6.8 (3.9) -5.2 (3.0) HP -3 -2.7 (2.0) -3.3 (2.3) -4.3 (2.8) -4.8 (2.7) -4.6 (2.4) -4.1 (2.1) -3.5 (2.0) HP -4 -1.7 (1.4) -2.0 (1.8) -2.7 (2.0) -2.9 (1.8) -2.9 (1.8) -2.8 (1.8) -2.7 (1.7) HP -5 -1.2 (1.3) -1.1 (1.4) -1.5 (1.7) -2.0 (1.9) -2.2 (1.6) -2.1 (1.5) -2.1 (1.5) VP3 VP2 VP1 VP0 VP-1 VP-2 VP-3 Table 1 Table 2 HP 0 -24.2 -32.2 -43.9 -40.9 -40.9 -37.8 -30.4 HP -1 -20.4 -26.8 -32.2 -33.6 -31.1 -24.3 -18.0 HP -2 -13.2 -17.0 -19.8 -20.6 -18.7 -15.9 -12.2 HP -3 -9.4 -11.3 -13.1 -13.7 -12.9 -10.8 -8.5 HP -4 -6.2 -7.6 -8.6 -8.5 -7.9 -6.9 -5.7 HP -5 -3.8 -4.4 -5.2 -5.4 -5.3 -4.7 -4.0 VP3 VP2 VP1 VP0 VP-1 VP-2 VP-3 Table 3