Kristina Bertl1,2, Verena Schulze Grotthoff2, Michael H Bertl3, Patrick Heimel4,5,6, André Gahleitner7, Christian Ulm2, Andreas Stavropoulos1. 1. Department of Periodontology, Faculty of Odontology, University of Malmö, Malmö, Sweden. 2. Division of Oral Surgery, University Clinic of Dentistry, Medical University of Vienna, Vienna, Austria. 3. Division of Orthodontics, University Clinic of Dentistry, Medical University of Vienna, Vienna, Austria. 4. Karl Donath Laboratory for Hard Tissue and Biomaterial Research, Division of Oral Surgery, Medical University of Vienna, Vienna, Austria. 5. Austrian Cluster for Tissue Regeneration, Vienna, Austria. 6. Ludwig Boltzmann Institute for Clinical and Experimental Traumatology, Vienna, Austria. 7. Department of Diagnostic Radiology, Division of Osteoradiology, General Hospital, Medical University of Vienna, Vienna, Austria.
Abstract
OBJECTIVES: To evaluate (i) a possible correlation between the mesio-distal gap width and the alveolar ridge (AR) dimensions in patients missing the maxillary lateral incisor (I2) either due to agenesis or loss and (ii) the possibility of straightforward implant placement based on simulation. METHODS: The bucco-palatal width, area, and height of the AR at the position of I2, and the mesio-distal gap width between the central incisor and the canine, were assessed in maxillary CT scans of three groups: Patients with (i) agenesis of I2 (TA ; n = 40); (ii) I2 regularly erupted but extracted (TL ; n = 24); (iii) I2 regularly erupted and in situ (C; n = 40). Further, the possibility of straightforward placement of an implant 3 or 3.5 mm in diameter ×10 mm in length, with 1 mm distance from the buccal and palatal plate of the alveolar ridge was simulated and compared to the actual treatment delivered. RESULTS: Bucco-palatal width and area of the AR at I2 and the adjacent teeth was significantly reduced in TA compared to TL and C. Further, in TA , but not TL , an increasing mesio-distal gap width between the central incisor and canine resulted in a significantly reduced bucco-palatal width of the edentulous AR. This impeded a simulated straightforward implant placement in >50% of the cases in TA , even with a reduced implant diameter. CONCLUSIONS: In patients congenitally missing I2, an increased mesio-distal gap width correlates significantly with reduced edentulous AR dimensions. A mesio-distal gap of >6 mm was associated with thin bucco-palatal alveolar ridges, precluding straightforward implant placement in 60-80% of the cases.
OBJECTIVES: To evaluate (i) a possible correlation between the mesio-distal gap width and the alveolar ridge (AR) dimensions in patients missing the maxillary lateral incisor (I2) either due to agenesis or loss and (ii) the possibility of straightforward implant placement based on simulation. METHODS: The bucco-palatal width, area, and height of the AR at the position of I2, and the mesio-distal gap width between the central incisor and the canine, were assessed in maxillary CT scans of three groups: Patients with (i) agenesis of I2 (TA ; n = 40); (ii) I2 regularly erupted but extracted (TL ; n = 24); (iii) I2 regularly erupted and in situ (C; n = 40). Further, the possibility of straightforward placement of an implant 3 or 3.5 mm in diameter ×10 mm in length, with 1 mm distance from the buccal and palatal plate of the alveolar ridge was simulated and compared to the actual treatment delivered. RESULTS: Bucco-palatal width and area of the AR at I2 and the adjacent teeth was significantly reduced in TA compared to TL and C. Further, in TA , but not TL , an increasing mesio-distal gap width between the central incisor and canine resulted in a significantly reduced bucco-palatal width of the edentulous AR. This impeded a simulated straightforward implant placement in >50% of the cases in TA , even with a reduced implant diameter. CONCLUSIONS: In patients congenitally missing I2, an increased mesio-distal gap width correlates significantly with reduced edentulous AR dimensions. A mesio-distal gap of >6 mm was associated with thin bucco-palatal alveolar ridges, precluding straightforward implant placement in 60-80% of the cases.
Authors: Michael Nemec; Linda Schwarz; Michael H Bertl; Kristina Bertl; André Gahleitner; Philipp Mitteroecker; Erwin Jonke Journal: Clin Oral Investig Date: 2022-08-29 Impact factor: 3.606
Authors: José Rubén Herrera-Atoche; Carlos Roberto Medina-Mazariegos; Iván Daniel Zúñiga-Herrera; Gabriel Eduardo Colomé-Ruiz; Fernando Javier Aguilar-Ayala; Alicia Leonor Pinzón-Te; Fernando Javier Aguilar-Pérez Journal: J Dent Sci Date: 2020-04-01 Impact factor: 2.080