CONTROL ID: 2599982
CONTACT: Andrew Tawse-Smith
Abstract Details


Single Tooth Replacement using Implants with Subcrestal Angular Correction Platform and All-Ceramic Crowns in The Esthetic Zone: 5-Year Prospective Study

AUTHORS: Tawse-Smith, Andrew; Ma, Sunyoung; Brown, Simon; Gray, Andrew

Immediate implant placement can be difficult resulting in an undesirable screw access on the labial surface of single implant crowns. Implants with subcrestal angular correction platform to reorient the screw access can overcome this dilemma when replacing maxillary anterior teeth. This 5-year prospective study will present the periimplant outcomes of immediately placed implants with all-ceramic crowns.

An original cohort of 27 participants (9 males; 18 females) requiring 28 single implant crowns in the aesthetic zone of maxilla (15 -25) was recruited for this prospective trial. All participants have been rehabilitated according to immediate implant placement and progressive loading protocols. Definitive screw-retained crowns were fabricated using densely sintered zirconia abutments with the veneering porcelain. Plaque, bleeding on probing, probing depth, width of keratinized tissues and marginal bone levels were evaluated. Exfoliative cytology samples from the external and internal peri-implant mucosa and periodontium of the contralateral tooth were collected.

These were evaluated using light microscopy (LM), scanning microscopy (SEM) and energy-dispersive spectroscopy (EDS).

Minimal or no plaque was detected at buccal and palatal sites. Plaque was found more frequently at mesial surfaces of both implants and natural teeth followed by distal surfaces . Shallow probing depths were observed for all sites (≤3mm) and median marginal bone levels were within acceptable range for both implant (0.65mm) and tooth sites (1.65mm). LM analysis from the smears identified acute inflammatory cells, epithelial cells and black scattered foreign material. Traces of metal were identified on both internal and external implant and tooth smears as confirmed by SEM and EDS analysis. Clinical measures were compared with signed Wilcoxon and McNemar’s tests, associations between these with Kruskal-Wallis and Fisher’s Exact tests. Camparison between smear sites were compared with linear and logistic mixed models.

Single tooth replacement with this implant design and all-ceramic crowns achieved successful clinical outcomes. Zirconia crowns supported by titanium implants can cause wear at the implant-abutment interface. However, the presence of metallic particles identified did not have any negative peri-implant outcome.

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