I have a 50 year old patient in excellent health who does not smoke and does not have diabetes. I have treatment planned for installation of implants in #19, 20 area [mandibular left first molar and second premolar; 36, 35]. The patient has significant vertical bone loss but declines a bone graft. I suspect that the patient also is a severe bruxer. I plan to install two 4.1 x 11.5mm implants and splint the crowns. I am also wondering if I should install a third implant in #18 site [mandibular left second molar; 37] and then splint all 3 crowns. Maybe over-engineering the case would compensate for the bruxism. What do you recommend?