This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
Which of the following mandibular major connector has minimal tissue contact with the oral tissues: 
Select and explain. 
A. Lingual plate., B. Lingual bar., C. Labial bar., D. Double lingual bar.
B: Lingual bar.
Answer: B: Lingual bar. 
Explanation: Lingual bar
• The basic form is half pear shaped bar, with the broadest portion at the inferior border of the bar.
• At least 8 mm of vertical space should be present between the active tissues of the floor of the mouth and gingival margins. The more inferior is the placement of lingual bar; less is the interference to the tongue.
• It is the first preference in the selection of lingual major connector.
• Surgical removal of the tori is usually required for a successful prognosis.
• It has minimal contact with the oral tissues.
• The sulcus must be relieved.
• Sublingual bar is the modification of the lingual bar. It is placed inferior and posterior to that of lingual bar.