<prompt> In which of the following type of osteogenesis imperfecta, 90 of newborn die before 4 weeks of age?Type IType IIType IIIType IV  <response>: Type I Osteogenesis imperfecta is the most common and the mildest form of osteogenesis imperfecta. Around 10 of the patients show prenatal fractures.Type II is the most severe form of osteogenesis imperfecta, with extreme bone fragility and frequent fractures. Around 90 of the cases are either stillborn or die before 4 weeks of postnatal life. Prenatal fractures are common in most of the patients.In utero fractures occur in 50 of the Type III osteogenesis imperfecta patients. The rest of the cases acquire fractures in the neonatal period. No hearing loss has been reported in this type.Reference: Shafers Textbook of ORAL PATHOLOGY Eighth Edition page no 458,459 