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Journal of Oral Science & Rehabilitation Issue 01/2015

62 Volume 1 | Issue 1/2015 Journal of Oral Science & Rehabilitation A volumetric 3-D digital analysis of dimensional changes to the alveolar process at implants placed immediately into extraction sockets Volum etric 3 -D d igita l analysi s Abstract Ob jec tive The objective of this study was to validate the use of a novel method to elaborate 3-D data on dimensional changes to the alveolar process after one year of heal- ing at implants placed immediately into extraction sockets. Materia ls a n d m eth od s Ten consecutive subjects were recruited and in- cluded in the test. Impressions were taken using polyvinyl siloxane before tooth extraction and one year after implant placement, and gypsum casts wereobtained. Thetwocastsweredigitalizedusingalaboratory laserscannerandimportedintotwodifferentanaly- sis software programs for 2-D and 3-D analyses. In orderto analyze global errors ofthe 3-D procedure, acontralateralcontrolsitewasincluded. Res ults The 2-D analysis indicated a tendencyto higher horizon- tal resorption of the alveolar process in the central re- gions comparedwiththe mesial and distal regions. Simi- lar results were observed at the lingual/palatal aspect andintheglobalhorizontalvariation. The3-Danalysisfoundthat,whentheabsolutevalues weretaken into account,the largerthe region ofinterest, the higherthevolume loss,with a positive linearcorrela- tionbetweenthetwovariables(R2= 0.9346;y= 0.126x). The global volume loss in percentage was 12.7 ± 3.1%, ofwhich 5.9 ± 1.9%was atthe buccal and 6.8 ± 2.2% at thelingual/palatalaspects.Thedifferencebetweenthe two aspects was not statistically significant. Small variations in volume at the control sites were also ob- served that represented the errors included in the 3-D analysis. Co nclu si o n The 2-D method can be very useful for understanding changes at a localized point. The 3-D method proposed is faster, more accurate at expressing the volume loss and correlated to the dimensions ofthe analyzed region. The use of this method is consequently highly recom- mended. Ke y wo rds Implant dentistry, bone healing, extraction socket, Type I placement, immediate implant, IPIES (implants placed immediatelyinto extraction sockets).

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