***TASK*** the task is to summarize an input biomedical literature in six sentences 
    ***INPUT*** the input is a biomedical literature 
    ***OUTPUT*** the output is the summary of an input biomedical literature in six sentences 
    ***DOCUMENTATION*** 
    ***EXAMPLES*** 
    Input: PURPOSE Achieving primary implant stability in areas with poor bone density is often challenging to the clinician . Previous research has suggested that modified surgical protocol s might be beneficial in such situations . The objective of the present clinical study was to evaluate the survival rate of implants placed using undersized implant site preparation in areas with poor bone density . MATERIAL S AND METHODS A total of 52 implants were placed in 29 patients . Of the 52 implants , 26 were surgically placed according to the st and ard drilling protocol ( control group ) and 26 were placed in low-density bone using an adapted bone drilling method ( test group ) . The maximum insertion torque values and resonance frequency analysis measurements were also recorded . All implants were examined clinical ly and radiographically at follow-up visits during the study period . Oral hygiene status , bleeding on probing , peri-implant probing depth , and implant survival rate were assessed . RESULTS According to the survival criteria used in the present study , no failure was recorded , and the overall survival rate was 100 % for both groups after 12 months . The mean probing depth was 2.75 ± 0.75 mm in the test group and 2.87 ± 0.79 mm in the control group . The mean insertion torque value was 35.19 ± 4.79 Ncm in the test group and 34.62 ± 5.82 Ncm in the control group . The resonance frequency analysis value was 68.58 ± 4.81 implant stability quotient and 66.69 ± 5.41 implant stability quotient in the test and control groups , respectively . The observed differences were not statistically significant ( P > .05 ) . CONCLUSIONS The results of the present study suggest that placement of implants by an adapted drilling technique in sites with poor bone density is beneficial in enhancing primary implant stability and improving the implant survival rate PURPOSE This study evaluated the survival parameters of  single-tooth implants  through clinical and radiographic analysis . MATERIAL S AND METHODS Implants were restored within a 24-hour period with a provisional crown design ed to receive an occlusal masticatory load . This approach was compared to implants restored after a healing period ( the control group ) . Forty-six implants were placed in 23 patients who were each treated with 2 Frialit-2 implants placed in sites between the second premolar in the maxilla or m and ible . The manufacturer 's recommended formal surgical procedure was followed , and primary stability was st and ardized with a minimum insertion torque of 20 Ncm . The sites were r and omly selected , and the clinical and radiographic parameters were st and ardized with individual templates . RESULTS Data were collected at 24 h , and at 1 , 3 , 6 , 12 , 18 , and 24 months . The experimental group included 10 failed implants ; 9 of the failed implants had been placed with an insertion torque of 20 Ncm . One implant from the control group failed during the 24-month follow-up period . The survival rate was independent of implant length , site position , and bone quality and quantity . Relative risk for implant failure was associated with insertion torque ( relative risk 0.79 [ CI : 0.66 - 0.930 ] ; Cox regression ) ( P < or = .007 ) , in the experimental group but was not significant for those in the control group ( ie , implants placed after a healing period ; relative risk 0.78 [ CI : 0.34 - 1.78 ] ; Cox regression ) ( P < or = .057 ) . To achieve osseointegration , it was found that an insertion torque above 32 Ncm was necessary ( chi2= 15.68 ; P < or = .004 ) . DISCUSSION A careful evaluation is necessary for a better underst and ing of the survival rates of immediately loaded implants . In this study , insertion torque was associated with the potential for risk , which can be decreased by 20 % per 9.8 Ncm added . CONCLUSION Given these results , and considering the number of patients treated , immediate provisional crowns should only be proposed with early loading if an appropriate initial insertion torque has been applied 
    Output:
    
A literature review was done , following which it was seen that the use of versah drills for bone OD result ed in undersized osteotomy compared to conventional drills .
It also result ed in improved bone density and increase in percentage bone volume and bone-to-implant contact , thereby improving implant stability