Welcome to just answer.
If the there is extensive loss of tooth structure and the crack in the tooth is vertical(across the tooth divding it into two halves) than it is difficult to restore this tooth and extraction is advisable.
I can understand that procedures such as implants will not be covered by your dental
insurances as it comes under the cosmetic procedures as there are other less expensive dental procedures that will replace missing teeth besides implants, the dental insurance companies only pay for the least costly options.
Please remember that after extraction it is very important to replace that missing molar.If the gum area is left empty there are chances of the adjacent teeth drifting into that area,this is called as pathologic tooth migration.Soft tissue forces of the tongue, cheeks, and lips are known to cause tooth movement and in some situations can cause pathologic tooth migration.Eruption
forces sometimes play a role in its etiology as there is some tooth movement taking place throughout the age,The drifting teeth become crooked and misaligned making them more prone to decay
because they are harder to keep clean.
Look at the link:http://www.gumsurgery.com/tooth_drifting.htm
Over the course of time one can also see receeded gums.We have two molars on each side ..the need of second one wouldnt have arised if we could just worked well with one.
Molars bear all the forces of mastication
and are the most functional and essential teeth in the oral cavity
Its also great to know that you have maintained your oral hyiegine and your gums/teeth are in good shape!!
After extraction you can go in for options like bridges or removable partial denture
for your missing molars,There cost is less and if well fabricated and placed give good results.
You can contact your dental associations for help who can guide you well.Here is the link for there address and contact details
You can also approach dental schools in and around your city and seek the treatment from there,The cost of treatment is much less a compared to any private practioner.http://www.dentalclinicmanager.com/list-of-dental-schools.html
I hope this answers all your queries.Please feel free to contact me again for help.If satisfied please accept.