In this study, we collected and analysed the review results of 100 patients over 18 years of age who received implant fixed restorations in the Department of Stomatology of the First Hospital of Nanjing, China. The aim was to investigate the incidence of loss of contact between implant restorations and adjacent teeth and its influencing factors. Our findings may provide better insights for treatment planning and prevention of PCL.
(1) Patients over the age of 18, can fully understand the nature of the proposed and be able to sign a consent form.
(2) patients who underwent dental implant surgery and delivered prostheses for more than 3 months in Nanjing First Hospital.
(1) The implant site or adjacent teeth were severely injured and the adjacent teeth were extracted;
(2) the same quadrant orthodontic or splint treatment;
(3) the prostheses have been removed due to failure or need further treatment;
(4) implant-supported prostheses in both mesial and distal sites;
One hundred consecutive patients, who had received either implant-supported fixed partial denture (FPD) or implant-supported single crown (SC) in the posterior region and were under regular review, were recruited.
Case-only
Cross-sectional
plaque index assessment, periodontal probing, Bleeding on probing (BOP), Prosthetic adjacency check, initial occlusal contact, maximum occlusal contact, and filling of the cusps.
Behavioraloral panoramic radiograph
the proximal contact surface was adjusted by a dental floss (Reach waxed dental floss from Johnson & Johnson, standard thickness)
The degree of proximal contact loss(PCL) was evaluated with a dental floss passing through the contact areas and classified as: (a) tight: sufficient resistance to the passage of the floss; (b) loose: insufficient resistance to the passage of the floss; and (c) open: contact: no resistance to the passage of the floss. The presence of an open or loose contact was classified as PCL.
oral panoramic radiograph
Using the radiograph analysis software's measuring function, the amount of alveolar bone resorption of the implant as well as adjacent teeth was evaluated. (a)The original bone height was measured as the distance between the enamel-cemental junction and the root apex (or the implant neck edge and the implant base). (b)The existing bone height was measured as the distance between the top of the alveolar ridge to the root apex. (c) The height of alveolar bone resorption was calculated by subtracting the original bone height from the existing bone height.
Bausch Arti-Fol R metallic Shimstock-Film
(a) Initial occlusal contact: Bausch articulating paper was applied to the restoration's occlusal surface, the patient was told to close their mouth slowly, the teeth just gently touched, and they opened their mouth right away. The paper was then removed, and the restoration's occlusal surface was examined to see if it had left a red mark. (b) Final occlusal contact: If the patient's restoration and opposing jaw teeth do not make contact during the initial occlusion, place the Bausch articulating paper on the restoration's occlusal surface, ask them to clench their teeth, and then have them open their mouth, take the paper out, and check to see if the implant's occlusal surface has any marks on it.
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