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Influence of geometric dimensions on early failures of adhesively retained composite resin core build‐ups
Author(s) -
Zenthöfer Andreas,
Rues Stefan,
Rammelsberg Peter,
Ohlmann Brigitte,
Bömicke Wolfgang
Publication year - 2023
Publication title -
journal of esthetic and restorative dentistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.919
H-Index - 60
eISSN - 1708-8240
pISSN - 1496-4155
DOI - 10.1111/jerd.12953
Subject(s) - post and core , core (optical fiber) , molar , amalgam (chemistry) , dentistry , adhesive , resin composite , materials science , bivariate analysis , bridge (graph theory) , computer science , orthodontics , mathematics , composite number , composite material , medicine , statistics , surgery , chemistry , electrode , layer (electronics) , crown (dentistry)
Objective To determine the influence of the geometric dimensions of core build‐ups on early core build‐up failure, that is, loss before definitive prosthesis cementation. Materials and Methods Adhesive core build‐ups of exclusively vital teeth in 114 participants were evaluated ( n materials: 40 Rebilda DC, 38 Multicore Flow, 36 Clearfil DC Core; n teeth: 8 incisors, 54 premolars, 52 molars). Impressions of the abutment teeth were made (1) after removal of insufficient restorations/caries and (2) after core build‐up and preparation for a fixed prosthesis. Digitized model surfaces of both situations were aligned (Geomagic Design X) and core build‐up volume ( V CBU ), remaining hard tissue volume ( V Abut ), and size of the adhesive surface ( A adh ) were assessed. The derived measure d CBU = V CBU / A adh can be interpreted as mean arithmetic core build‐up thickness. Associations between participant or core build‐up design characteristics and the occurrence of early failures were statistically evaluated (SPSS v27, α = 0.05). Results A total of six (5.3%) core build‐up failures were registered. Higher participant age, greater core build‐up volume V CBU and greater arithmetic uniform thickness d CBU were associated with a greater incidence of failure in bivariate and univariate, however, not in multivariate statistics. Conclusions Core build‐up volume and thickness were associated with early success or failure. Clinical Significance In the case of voluminous/thick core build‐ups in relation to the adhesive surface, additional measures, such as the preparation of retentive elements to increase the bonding area, might be considered to reduce the risk of early core build‐up failure.